http://hdl.handle.net/2117/3374 Fri, 24 May 2013 11:02:07 GMT 2013-05-24T11:02:07Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/19009 Title: Experimental analysis of a degraded open-cathode PEM fuel cell stack Authors: Strahl, Stephan; Gasamans Rodríguez, Noemí; Llorca Piqué, Jordi; Husar, Attila Peter Abstract: The well-known challenges to be overcome in PEM fuel cell research are their relatively low durability and high costs for the platinum catalysts. Thus, this work focuses on factors that impact durability and the links to the fuel cell performance. Therefore a degraded, open-cathode, 20-cell, PEM fuel cell stack, which was used in a laboratory test station for characterization experiments, was analyzed experimentally. Voltage transients during external perturbations, such as changing temperature, humidity and stoichiometries show that degradation affects individual cells quite differently throughout the lifetime of the stack. Electrochemical impedance spectroscopy (EIS) data presents non-reversible catalyst layer and membrane degradation of several cells. X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) are in progress in order to validate the results of the electrical analysis and elucidate catalyst and membrane degradation. Fri, 26 Apr 2013 12:04:59 GMT http://hdl.handle.net/2117/19009 2013-04-26T12:04:59Z Strahl, Stephan; Gasamans Rodríguez, Noemí; Llorca Piqué, Jordi; Husar, Attila Peter no power generation control PEM fuel cell, operating conditions, degradation, EIS The well-known challenges to be overcome in PEM fuel cell research are their relatively low durability and high costs for the platinum catalysts. Thus, this work focuses on factors that impact durability and the links to the fuel cell performance. Therefore a degraded, open-cathode, 20-cell, PEM fuel cell stack, which was used in a laboratory test station for characterization experiments, was analyzed experimentally. Voltage transients during external perturbations, such as changing temperature, humidity and stoichiometries show that degradation affects individual cells quite differently throughout the lifetime of the stack. Electrochemical impedance spectroscopy (EIS) data presents non-reversible catalyst layer and membrane degradation of several cells. X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) are in progress in order to validate the results of the electrical analysis and elucidate catalyst and membrane degradation. http://hdl.handle.net/2117/18727 Title: A method for accurate zero calibration of asymmetric jaws in single-isocenter half-beam techniques Authors: Hernandez Espinosa, Victor; Sempau Roma, Josep; Abella, R.; Romero Lopez, Matilde; Lopez Perez, Marcedes; Artigues, Manel; Arenas, M. Abstract: Purpose: To present a practical method for calibrating the zero position of asymmetric jaws that provides higher accuracy at the central axis and improves dose homogeneity in the abutting region of half-beams. Methods: Junction doses were measured for each asymmetric jaw using the double-exposure technique and electronic portal imaging devices. The junction dose was determined as a function of jaw position. The shift in the zero jaw position (or in its corresponding potentiometer readout) required to correct for the measured junction dose could thus be obtained. The jaw calibration was then modified to introduce the calculated shift and therefore achieve an accurate zero position in order to provide a relative junction dose that was as close to zero as possible. Results: All the asymmetric jaws from four medical linear accelerators were calibrated with the new calibration procedure. Measured relative junction doses at gantry 0° were reduced from a maximum of ±40% to a maximum of ±8% for all the jaws in the four considered accelerators. These results were valid for 6 MV and 18 MV photon beams and for any combination of asymmetric jaws set to zero. The calibration was stable over a long period of time; therefore, the need for recalibrating is seldom necessary. Conclusions: Accurate calibration of the zero position of the jaws is feasible in current medical linear accelerators. The proposed procedure is fast and it improves dose homogeneity at the junction of half-beams, thus, allowing a more accurate and safer use of these techniques. © 2013 American Association of Physicists in Medicine. Tue, 09 Apr 2013 10:55:46 GMT http://hdl.handle.net/2117/18727 2013-04-09T10:55:46Z Hernandez Espinosa, Victor; Sempau Roma, Josep; Abella, R.; Romero Lopez, Matilde; Lopez Perez, Marcedes; Artigues, Manel; Arenas, M. no Purpose: To present a practical method for calibrating the zero position of asymmetric jaws that provides higher accuracy at the central axis and improves dose homogeneity in the abutting region of half-beams. Methods: Junction doses were measured for each asymmetric jaw using the double-exposure technique and electronic portal imaging devices. The junction dose was determined as a function of jaw position. The shift in the zero jaw position (or in its corresponding potentiometer readout) required to correct for the measured junction dose could thus be obtained. The jaw calibration was then modified to introduce the calculated shift and therefore achieve an accurate zero position in order to provide a relative junction dose that was as close to zero as possible. Results: All the asymmetric jaws from four medical linear accelerators were calibrated with the new calibration procedure. Measured relative junction doses at gantry 0° were reduced from a maximum of ±40% to a maximum of ±8% for all the jaws in the four considered accelerators. These results were valid for 6 MV and 18 MV photon beams and for any combination of asymmetric jaws set to zero. The calibration was stable over a long period of time; therefore, the need for recalibrating is seldom necessary. Conclusions: Accurate calibration of the zero position of the jaws is feasible in current medical linear accelerators. The proposed procedure is fast and it improves dose homogeneity at the junction of half-beams, thus, allowing a more accurate and safer use of these techniques. © 2013 American Association of Physicists in Medicine. http://hdl.handle.net/2117/18722 Title: Present status and future programs of the n-TOF experiment Authors: Chiaveri, E.; Calviani, M.; Andriamonje, S.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Riego Pérez, Albert; Gómez Hornillos, María Belén; Vlachoudis, V.; Massimi, C. Abstract: The neutron time-of-flight facility n_TOF at CERN, Switzerland, operational since 2001, delivers neutrons using the Proton Synchrotron (PS) 20 GeV/c proton beam impinging on a lead spallation target. The facility combines a very high instantaneous neutron flux, an excellent time of flight resolution due to the distance between the experimental area and the production target (185 meters), a low intrinsic background and a wide range of neutron energies, from thermal to GeV neutrons. These characteristics provide a unique possibility to perform neutron-induced capture and fission cross-section measurements for applications in nuclear astrophysics and in nuclear reactor technology. The most relevant measurements performed up to now and foreseen for the future will be presented in this contribution. The overall efficiency of the experimental program and the range of possible measurements achievable with the construction of a second experimental area (EAR-2), vertically located 20 m on top of the n_TOF spallation target, might offer a substantial improvement in measurement sensitivities. A feasibility study of the possible realisation of the installation extension will be also presented. Tue, 09 Apr 2013 10:25:17 GMT http://hdl.handle.net/2117/18722 2013-04-09T10:25:17Z Chiaveri, E.; Calviani, M.; Andriamonje, S.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Riego Pérez, Albert; Gómez Hornillos, María Belén; Vlachoudis, V.; Massimi, C. no The neutron time-of-flight facility n_TOF at CERN, Switzerland, operational since 2001, delivers neutrons using the Proton Synchrotron (PS) 20 GeV/c proton beam impinging on a lead spallation target. The facility combines a very high instantaneous neutron flux, an excellent time of flight resolution due to the distance between the experimental area and the production target (185 meters), a low intrinsic background and a wide range of neutron energies, from thermal to GeV neutrons. These characteristics provide a unique possibility to perform neutron-induced capture and fission cross-section measurements for applications in nuclear astrophysics and in nuclear reactor technology. The most relevant measurements performed up to now and foreseen for the future will be presented in this contribution. The overall efficiency of the experimental program and the range of possible measurements achievable with the construction of a second experimental area (EAR-2), vertically located 20 m on top of the n_TOF spallation target, might offer a substantial improvement in measurement sensitivities. A feasibility study of the possible realisation of the installation extension will be also presented. http://hdl.handle.net/2117/18645 Title: Measurement of the Pu-240,242 neutron-induced fission cross sections Authors: Salvador-Castiñeria, P; Bevilacqua, R; Brys, T; Hambsch, FJ; Oberstedt, S; Pretel Sánchez, Carme; Vidali, M Fri, 05 Apr 2013 11:39:58 GMT http://hdl.handle.net/2117/18645 2013-04-05T11:39:58Z Salvador-Castiñeria, P; Bevilacqua, R; Brys, T; Hambsch, FJ; Oberstedt, S; Pretel Sánchez, Carme; Vidali, M no http://hdl.handle.net/2117/18635 Title: Performance of the magnetic system of a 12 MeV UPC race-track microtron Authors: Koubychine Merkulov, Youri Alexandrovich; Rigla Perez, Juan Pablo; Shvedunov, V.I.; Pakhomov, N.I. Abstract: The per­for­mance of the mag­netic sys­tem of a 12 MeV elec­tron race-track mi­cro­tron (RTM) which is under con­struc­tion at the Uni­ver­si­tat Politècnica de Catalunya (UPC) is de­scribed. The RTM mag­netic sys­tem con­sists of two four-pole end mag­nets with the main field level about 0.8 T, one quadru­pole and four beam ex­trac­tion dipoles. As a source of the mag­netic field in these mag­nets a Sa-Co rare earth per­ma­nent mag­net ma­te­r­ial is used. This helps to get a quite com­pact de­sign of the RTM and al­lows to place the mag­netic sys­tems in a high vac­uum en­vi­ron­ment of the ac­cel­er­a­tor vac­uum cham­ber. We dis­cuss re­sults of nu­mer­i­cal sim­u­la­tions of the tun­ing of the end mag­nets by mean of spe­cial tuners and de­scribe their en­gi­neer­ing de­sign which per­mits to as­sem­ble the mag­nets and fix the Sa-Co blocks with­out glu­ing. Also a method and re­sults of mag­netic field dis­tri­b­u­tion mea­sure­ments and mag­net tun­ing are re­ported. Fri, 05 Apr 2013 10:03:10 GMT http://hdl.handle.net/2117/18635 2013-04-05T10:03:10Z Koubychine Merkulov, Youri Alexandrovich; Rigla Perez, Juan Pablo; Shvedunov, V.I.; Pakhomov, N.I. no The per­for­mance of the mag­netic sys­tem of a 12 MeV elec­tron race-track mi­cro­tron (RTM) which is under con­struc­tion at the Uni­ver­si­tat Politècnica de Catalunya (UPC) is de­scribed. The RTM mag­netic sys­tem con­sists of two four-pole end mag­nets with the main field level about 0.8 T, one quadru­pole and four beam ex­trac­tion dipoles. As a source of the mag­netic field in these mag­nets a Sa-Co rare earth per­ma­nent mag­net ma­te­r­ial is used. This helps to get a quite com­pact de­sign of the RTM and al­lows to place the mag­netic sys­tems in a high vac­uum en­vi­ron­ment of the ac­cel­er­a­tor vac­uum cham­ber. We dis­cuss re­sults of nu­mer­i­cal sim­u­la­tions of the tun­ing of the end mag­nets by mean of spe­cial tuners and de­scribe their en­gi­neer­ing de­sign which per­mits to as­sem­ble the mag­nets and fix the Sa-Co blocks with­out glu­ing. Also a method and re­sults of mag­netic field dis­tri­b­u­tion mea­sure­ments and mag­net tun­ing are re­ported. http://hdl.handle.net/2117/18205 Title: Diseño conceptual e ingenieria de detalle de un lazo experimental dual Pb15.7Li/ He (proyecto BCN_LOOP®): una propuesta de proyecto de I+D+i industrial para desarrollos clave en tecnologia nuclear de fusion Authors: Batet Miracle, Lluís; Reventós Puigjaner, Francesc Josep; Mas de les Valls Ortiz, Elisabet; Fernández, Iván; Veredas, G.; Abellà, Jordi; Sempere Cebrían, Julià; Sanmartí, Manel; Linares, José Ignacio; Sedano, L.A. Tue, 12 Mar 2013 12:24:21 GMT http://hdl.handle.net/2117/18205 2013-03-12T12:24:21Z Batet Miracle, Lluís; Reventós Puigjaner, Francesc Josep; Mas de les Valls Ortiz, Elisabet; Fernández, Iván; Veredas, G.; Abellà, Jordi; Sempere Cebrían, Julià; Sanmartí, Manel; Linares, José Ignacio; Sedano, L.A. no http://hdl.handle.net/2117/18170 Title: Análisis de la permeación de tritio en los canales de metal líquido de las envolturas regeneradoras de un reactor de fusión en presencia de burbujas de helio Authors: Batet Miracle, Lluís; Mas de les Valls Ortiz, Elisabet; Sedano, L.A. Abstract: En el interior de los canales de metal l quido de las envolturas regeneradoras de un reactor de fusi on, la posibilidad de existencia de burbujas de helio nucleado no es remota. El helio se forma junto al tritio en la reacci on de los neutrones escapados del plasma con el litio. La acumulaci on de helio en las super cies de contacto entre la estructura y el ML conllevar a una reducci on de la transferencia de calor, al mismo tiempo que una reducci on en la permeaci on de tritio. La coexistencia de tres fases en contacto: metal l quido, helio y material estructural, convierte al transporte de calor y tritio en fen omenos complejos. Para enriquecer estudios de transporte de tritio realizados en el pasado, se plantea ahora un an alisis de detalle del entorno de una burbuja de helio adherida a la pared de un canal de ML de una envoltura regeneradora. Para el estudio se ha utilizado una herramienta CFD desarrollada sobre el c odigo libre OpenFOAM. El transporte de tritio a trav es de las tres fases y a trav es de cada interfase se ha analizado de forma detallada mediante simulaci on CFD. El modelo incluye los distintos mecanismos de transporte: difusi on en ML y gas; recombinaci on y disociaci on en las interfases. Los resultados obtenidos deben permitir re nar los modelos simpli cados ya utilizados en el c alculo de transporte de tritio en canales de ML en presencia de helio nucleado en las paredes Mon, 11 Mar 2013 11:45:59 GMT http://hdl.handle.net/2117/18170 2013-03-11T11:45:59Z Batet Miracle, Lluís; Mas de les Valls Ortiz, Elisabet; Sedano, L.A. no En el interior de los canales de metal l quido de las envolturas regeneradoras de un reactor de fusi on, la posibilidad de existencia de burbujas de helio nucleado no es remota. El helio se forma junto al tritio en la reacci on de los neutrones escapados del plasma con el litio. La acumulaci on de helio en las super cies de contacto entre la estructura y el ML conllevar a una reducci on de la transferencia de calor, al mismo tiempo que una reducci on en la permeaci on de tritio. La coexistencia de tres fases en contacto: metal l quido, helio y material estructural, convierte al transporte de calor y tritio en fen omenos complejos. Para enriquecer estudios de transporte de tritio realizados en el pasado, se plantea ahora un an alisis de detalle del entorno de una burbuja de helio adherida a la pared de un canal de ML de una envoltura regeneradora. Para el estudio se ha utilizado una herramienta CFD desarrollada sobre el c odigo libre OpenFOAM. El transporte de tritio a trav es de las tres fases y a trav es de cada interfase se ha analizado de forma detallada mediante simulaci on CFD. El modelo incluye los distintos mecanismos de transporte: difusi on en ML y gas; recombinaci on y disociaci on en las interfases. Los resultados obtenidos deben permitir re nar los modelos simpli cados ya utilizados en el c alculo de transporte de tritio en canales de ML en presencia de helio nucleado en las paredes http://hdl.handle.net/2117/18168 Title: Máster en Ingeniería Nuclear por la UPC (Máster UPC-ENDESA). Balance de la primera edición Authors: Batet Miracle, Lluís; Duch Guillen, María Amor; Calviño Tavares, Francisco; del Val, Luis; Fernández-Olano, Pablo Abstract: El Máster en Ingeniería Nuclear por la UPC, está orientado a la formación de ingenieros nucleares con un nivel alto de competencias que les permitan optar a puestos de responsabilidad en empresas del sector. El máster, que ha iniciado su andadura durante el curso 2011-2012, cuenta con el patrocinio de ENDESA y la colaboración de entidades y empresas del sector. En esta ponencia se realiza un balance de los dos primeros semestres del máster y se describen los puntos fuertes y las oportunidades de mejora detectados. En el análisis se ha tenido en cuenta el rendimiento académico de los estudiantes, sus impresiones y el grado de satisfacción. La información se ha recogido a través de encuestas, entrevistas personales y reuniones con todo el grupo de estudiantes. Los 90 créditos ECTS del Máster se reparten en asignaturas obligatorias (46,5) y optativas (13,5) y prácticas externas y Proyecto Final. La participación de expertos externos a la universidad ha sido muy alta (casi un 50 % de la docencia), especialmente en las materias de Gestión de Plantas y Normativa y Seguridad. Todas las materias incluyen actividades basadas en aprendizaje activo y trabajo en equipo: se consigue así que el sistema de evaluación sea una parte integral e inseparable del proceso de aprendizaje. En cada uno de los dos semestres lectivos, los estudiantes desarrollan un proyecto transversal en grupos de tres o cuatro miembros. En general el grado de satisfacción del alumnado es muy bueno, pero se han detectado algunos aspectos referentes a la distribución de la carga de trabajo y a los mecanismos de evaluación que han sido mejorados sobre la marcha. Estas mejoras se incorporarán en la edición de 2012-2013. Creemos que el Máster satisface las expectativas del sector y de la sociedad a la vez que presenta un gran atractivo para los estudiantes. Mon, 11 Mar 2013 11:18:50 GMT http://hdl.handle.net/2117/18168 2013-03-11T11:18:50Z Batet Miracle, Lluís; Duch Guillen, María Amor; Calviño Tavares, Francisco; del Val, Luis; Fernández-Olano, Pablo no El Máster en Ingeniería Nuclear por la UPC, está orientado a la formación de ingenieros nucleares con un nivel alto de competencias que les permitan optar a puestos de responsabilidad en empresas del sector. El máster, que ha iniciado su andadura durante el curso 2011-2012, cuenta con el patrocinio de ENDESA y la colaboración de entidades y empresas del sector. En esta ponencia se realiza un balance de los dos primeros semestres del máster y se describen los puntos fuertes y las oportunidades de mejora detectados. En el análisis se ha tenido en cuenta el rendimiento académico de los estudiantes, sus impresiones y el grado de satisfacción. La información se ha recogido a través de encuestas, entrevistas personales y reuniones con todo el grupo de estudiantes. Los 90 créditos ECTS del Máster se reparten en asignaturas obligatorias (46,5) y optativas (13,5) y prácticas externas y Proyecto Final. La participación de expertos externos a la universidad ha sido muy alta (casi un 50 % de la docencia), especialmente en las materias de Gestión de Plantas y Normativa y Seguridad. Todas las materias incluyen actividades basadas en aprendizaje activo y trabajo en equipo: se consigue así que el sistema de evaluación sea una parte integral e inseparable del proceso de aprendizaje. En cada uno de los dos semestres lectivos, los estudiantes desarrollan un proyecto transversal en grupos de tres o cuatro miembros. En general el grado de satisfacción del alumnado es muy bueno, pero se han detectado algunos aspectos referentes a la distribución de la carga de trabajo y a los mecanismos de evaluación que han sido mejorados sobre la marcha. Estas mejoras se incorporarán en la edición de 2012-2013. Creemos que el Máster satisface las expectativas del sector y de la sociedad a la vez que presenta un gran atractivo para los estudiantes. http://hdl.handle.net/2117/18001 Title: Performance of the neutron time-of-flight facility n TOF at CERN Authors: Guerrero, C; Tsinganis, A; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén; Hernández Prieto, Álvaro; Riego Pérez, Albert Abstract: The neutron time-of-flight facility n TOF features a white neutron source produced by spallation through 20 GeV/c protons impinging on a lead target. The facility, aiming primarily at the measurement of neutron-induced reaction cross sections, was operating at CERN between 2001 and 2004, and then underwent a major upgrade in 2008. This paper presents in detail all the characteristics of the new neutron beam in the currently available configurations, which correspond to two different collimation systems and two choices of neutron moderator. The characteristics discussed include the intensity and energy dependence of the neutron flux, the spatial profile of the beam, the in-beam background components and the energy resolution/broadening. The discussion of these features is based on dedicated measurements and Monte Carlo simulations, and includes estimations of the systematic uncertainties of the mentioned quantities. Wed, 27 Feb 2013 10:50:01 GMT http://hdl.handle.net/2117/18001 2013-02-27T10:50:01Z Guerrero, C; Tsinganis, A; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén; Hernández Prieto, Álvaro; Riego Pérez, Albert no The neutron time-of-flight facility n TOF features a white neutron source produced by spallation through 20 GeV/c protons impinging on a lead target. The facility, aiming primarily at the measurement of neutron-induced reaction cross sections, was operating at CERN between 2001 and 2004, and then underwent a major upgrade in 2008. This paper presents in detail all the characteristics of the new neutron beam in the currently available configurations, which correspond to two different collimation systems and two choices of neutron moderator. The characteristics discussed include the intensity and energy dependence of the neutron flux, the spatial profile of the beam, the in-beam background components and the energy resolution/broadening. The discussion of these features is based on dedicated measurements and Monte Carlo simulations, and includes estimations of the systematic uncertainties of the mentioned quantities. http://hdl.handle.net/2117/17872 Title: The 93-Zr(n,gamma) reaction up to 8 keV neutron energy Authors: Tagliente, G.; Milazzo, P.M.; Fujiii, K.; Abbondanno, U.; Aerts, G.; Calviño Tavares, Francisco; Pretel Sánchez, Carme; Cortés Rossell, Guillem Pere Abstract: he (n,gamma) reaction of the radioactive isotope 93Zr has been measured at the n_TOF high-resolution time-of-flight facility at CERN. Resonance parameters have been extracted in the neutron energy range up to 8 keV,yielding capture widths smaller (14%) than reported in an earlier experiment. These results are important for detailed nucleosynthesis calculations and for refined studies of waste transmutation concepts. Tue, 19 Feb 2013 11:09:27 GMT http://hdl.handle.net/2117/17872 2013-02-19T11:09:27Z Tagliente, G.; Milazzo, P.M.; Fujiii, K.; Abbondanno, U.; Aerts, G.; Calviño Tavares, Francisco; Pretel Sánchez, Carme; Cortés Rossell, Guillem Pere no he (n,gamma) reaction of the radioactive isotope 93Zr has been measured at the n_TOF high-resolution time-of-flight facility at CERN. Resonance parameters have been extracted in the neutron energy range up to 8 keV,yielding capture widths smaller (14%) than reported in an earlier experiment. These results are important for detailed nucleosynthesis calculations and for refined studies of waste transmutation concepts. http://hdl.handle.net/2117/17758 Title: Comissioning of the decelerator test beam line in CTF3 Authors: Adli, E; Döbert, Steffan; Lillestol, R; Olvegaard, M; Syratchev, I; Carrillo, David; Toral, Fernando; Faus-Golfe, Angeles; García-Garrigos, JJ; Koubychine Merkulov, Youri Alexandrovich; Montoro López, Gabriel Abstract: The CLIC Test Facility (CTF3) at CERN was constructed by the CTF3 collaboration to study the feasibility of the concepts for a compact linear collider. The test beam line (TBL) recently added to the CTF3 machine was designed to study the CLIC decelerator beam dynamics and 12 GHz power production. The beam line consists of a FODO lattice with high precision BPM’s and quadrupoles on movers for precise beam alignment. A total of 16 Power Extraction and Transfer Structures (PETS) will be installed in between the quadrupoles to extract 12 GHz power from the drive beam provided by the CTF3 machine. The CTF3 drive beam with a bunchtrain length of 140 ns, 12 GHz bunch repetition frequency and an average current over the train of up to 28 A will be injected into the test beam line. Each PETS structure will produce 135 MW of 12 GHz power at nominal current. The beam will have lost more than 50 % of its initial energy of 150 MeV at the end of the beam line and will contain particles with energies between 65 MeV and 150 MeV. The beam line is completely installed and the PETS structures will be successively added until the end of 2011. The paper will describe the first results obtained during commissioning of the beam line and the first PETS prototype. Thu, 14 Feb 2013 11:52:46 GMT http://hdl.handle.net/2117/17758 2013-02-14T11:52:46Z Adli, E; Döbert, Steffan; Lillestol, R; Olvegaard, M; Syratchev, I; Carrillo, David; Toral, Fernando; Faus-Golfe, Angeles; García-Garrigos, JJ; Koubychine Merkulov, Youri Alexandrovich; Montoro López, Gabriel no The CLIC Test Facility (CTF3) at CERN was constructed by the CTF3 collaboration to study the feasibility of the concepts for a compact linear collider. The test beam line (TBL) recently added to the CTF3 machine was designed to study the CLIC decelerator beam dynamics and 12 GHz power production. The beam line consists of a FODO lattice with high precision BPM’s and quadrupoles on movers for precise beam alignment. A total of 16 Power Extraction and Transfer Structures (PETS) will be installed in between the quadrupoles to extract 12 GHz power from the drive beam provided by the CTF3 machine. The CTF3 drive beam with a bunchtrain length of 140 ns, 12 GHz bunch repetition frequency and an average current over the train of up to 28 A will be injected into the test beam line. Each PETS structure will produce 135 MW of 12 GHz power at nominal current. The beam will have lost more than 50 % of its initial energy of 150 MeV at the end of the beam line and will contain particles with energies between 65 MeV and 150 MeV. The beam line is completely installed and the PETS structures will be successively added until the end of 2011. The paper will describe the first results obtained during commissioning of the beam line and the first PETS prototype. http://hdl.handle.net/2117/17656 Title: Current status of the 12 MeV UPC race-track microtron Authors: Koubychine Merkulov, Youri Alexandrovich; Berenguer Sau, Jordi; Crisol, A; Gonzalez, Xavier; Montoro López, Gabriel; Rigla Perez, Juan Pablo; Roure Fernández, Francisco; Carrillo, David; Garcia-Tabares, Luis; Toral, F; Lucas, J; Aloev, A.V.; Shvedunov, V.I. Abstract: A com­pact race-track mi­crotron (RTM) with the max­i­mal out­put en­er­gy 12 MeV is under con­struc­tion at the Uni­ver­si­tat Politècnica de Catalun­ya (UPC) in col­lab­o­ra­tion with the Sko­belt­syn In­sti­tute of Nu­cle­ar Physics of the Moscow State Uni­ver­si­ty, CIEMAT and a few Span­ish in­dus­tri­al com­pa­nies and med­i­cal cen­ters. The RTM end mag­nets are four-pole sys­tems with the mag­net­ic field cre­at­ed by a rare-earth per­ma­nent mag­net ma­te­ri­al. As a source of elec­trons a 3D off-ax­is elec­tron gun is used. These el­e­ments to­geth­er with a C-band ac­cel­er­at­ing struc­ture, dipole mag­nets, which allow to ex­tract the elec­tron beam with en­er­gy from 6 MeV to 12 MeV in 2 MeV step, and a fo­cus­ing quadrupole are placed in­side a vac­u­um cham­ber. We re­port on the cur­rent sta­tus of the tech­ni­cal de­sign and re­sults of tests of some of the com­po­nents. Tue, 12 Feb 2013 13:01:40 GMT http://hdl.handle.net/2117/17656 2013-02-12T13:01:40Z Koubychine Merkulov, Youri Alexandrovich; Berenguer Sau, Jordi; Crisol, A; Gonzalez, Xavier; Montoro López, Gabriel; Rigla Perez, Juan Pablo; Roure Fernández, Francisco; Carrillo, David; Garcia-Tabares, Luis; Toral, F; Lucas, J; Aloev, A.V.; Shvedunov, V.I. no A com­pact race-track mi­crotron (RTM) with the max­i­mal out­put en­er­gy 12 MeV is under con­struc­tion at the Uni­ver­si­tat Politècnica de Catalun­ya (UPC) in col­lab­o­ra­tion with the Sko­belt­syn In­sti­tute of Nu­cle­ar Physics of the Moscow State Uni­ver­si­ty, CIEMAT and a few Span­ish in­dus­tri­al com­pa­nies and med­i­cal cen­ters. The RTM end mag­nets are four-pole sys­tems with the mag­net­ic field cre­at­ed by a rare-earth per­ma­nent mag­net ma­te­ri­al. As a source of elec­trons a 3D off-ax­is elec­tron gun is used. These el­e­ments to­geth­er with a C-band ac­cel­er­at­ing struc­ture, dipole mag­nets, which allow to ex­tract the elec­tron beam with en­er­gy from 6 MeV to 12 MeV in 2 MeV step, and a fo­cus­ing quadrupole are placed in­side a vac­u­um cham­ber. We re­port on the cur­rent sta­tus of the tech­ni­cal de­sign and re­sults of tests of some of the com­po­nents. http://hdl.handle.net/2117/17626 Title: Simulations of emittance measurement at CLIC Authors: Koubychine Merkulov, Youri Alexandrovich; Garcia, Hector; Marin Lacoma, Eduard; Schulte, Daniel; Stulle, Frank Abstract: A proposal for a CLIC emittance measurement line using laser-wire beam profile monitors is presented. Results of simulations and optimizations are given. Estimates of the impact of beam size as well as statistical and machinerelated errors on the measurement accuracy are discussed. Mon, 11 Feb 2013 12:18:12 GMT http://hdl.handle.net/2117/17626 2013-02-11T12:18:12Z Koubychine Merkulov, Youri Alexandrovich; Garcia, Hector; Marin Lacoma, Eduard; Schulte, Daniel; Stulle, Frank no A proposal for a CLIC emittance measurement line using laser-wire beam profile monitors is presented. Results of simulations and optimizations are given. Estimates of the impact of beam size as well as statistical and machinerelated errors on the measurement accuracy are discussed. http://hdl.handle.net/2117/17623 Title: A novel electron gun for off-beam injection Authors: Koubychine Merkulov, Youri Alexandrovich; Aloev, A.V.; Shvedunov, V.I.; Pakhomov, N.I. Abstract: For certain type of electron accelerators injection from an off-axis cathode is required. This is the case of a racetrack microtron (RTM), in which the beam passes several times through the accelerating structure, or of a high power standing wave electron linac, for which the lifetime of an on-axis cathode would be strongly reduced by the electron back-bombardment. The standard solution with the beam injection via a dipole magnet from an electron gun placed off-axis is too bulky, moreover in case of RTMs it requires special compensating dipoles. An annular ring cathode gun used in some accelerators leads to large beam emittance and divergence. As a new solution we describe a 3D on-axis electron gun with an off-axis cathode and a central hole for the beam passage. Results of the design optimization and performance of an electron gun built for a miniature 12 MeV RTM for medical applications are presented. We also discuss results of the beam parameters measurements and estimates of the beam emittance. Mon, 11 Feb 2013 11:46:01 GMT http://hdl.handle.net/2117/17623 2013-02-11T11:46:01Z Koubychine Merkulov, Youri Alexandrovich; Aloev, A.V.; Shvedunov, V.I.; Pakhomov, N.I. no For certain type of electron accelerators injection from an off-axis cathode is required. This is the case of a racetrack microtron (RTM), in which the beam passes several times through the accelerating structure, or of a high power standing wave electron linac, for which the lifetime of an on-axis cathode would be strongly reduced by the electron back-bombardment. The standard solution with the beam injection via a dipole magnet from an electron gun placed off-axis is too bulky, moreover in case of RTMs it requires special compensating dipoles. An annular ring cathode gun used in some accelerators leads to large beam emittance and divergence. As a new solution we describe a 3D on-axis electron gun with an off-axis cathode and a central hole for the beam passage. Results of the design optimization and performance of an electron gun built for a miniature 12 MeV RTM for medical applications are presented. We also discuss results of the beam parameters measurements and estimates of the beam emittance. http://hdl.handle.net/2117/17604 Title: Design and magnetic measurements of the extraction magnet for 55 MeV race-track microtron Authors: Ermakov, A.N.; Khankin, V.A; Koubychine Merkulov, Youri Alexandrovich; Pakhomov, N.I.; Rigla Perez, Juan Pablo; Shvedunov, V.I. Abstract: We describe results of optimization of the extraction magnet of a 55 MeV Race- Track Microtron (RTM). Because of small spacing between the RTM orbits special attention has been paid to optimization of magnetic screens with the aim to decrease the influence of stray magnetic fields on the accelerated beam. Results of simulations with 2D and 3D codes are compared with magnetic field distribution measurements Fri, 08 Feb 2013 11:30:11 GMT http://hdl.handle.net/2117/17604 2013-02-08T11:30:11Z Ermakov, A.N.; Khankin, V.A; Koubychine Merkulov, Youri Alexandrovich; Pakhomov, N.I.; Rigla Perez, Juan Pablo; Shvedunov, V.I. no We describe results of optimization of the extraction magnet of a 55 MeV Race- Track Microtron (RTM). Because of small spacing between the RTM orbits special attention has been paid to optimization of magnetic screens with the aim to decrease the influence of stray magnetic fields on the accelerated beam. Results of simulations with 2D and 3D codes are compared with magnetic field distribution measurements