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5by Pitman, Sam, Apsimon, Robert, Burt, Graeme, Green, Andrew, Grudiev, Alexej, Owen, Hywel, Solodko, Anastasiya, Wuensch, Walter“…Proton beam therapy has been shown to be a promising alternative to traditional radiotherapy, especially for paediatric malignancies and radio-resistant tumours. Allowing a highly precise tumour irradiation, it is currently limited by range verification. …”
Published 2017
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6by Esperante Pereira, Daniel, Blanch Gutiérrez, Cesar, Boronat, Marça, Fuster, Juan, Gonzalez Iglesias, Daniel, Vnuchenko, Anna, Catalán Lasheras, Nuria, Gimeno, Benito, McMonagle, Gerard, Syratchev, Igor, Wuensch, Walter, Woolley, B, Faus-Golfe, Angeles“…An S-Band High-Gradient (HG) Radio Frequency (RF) laboratory is under construction and commissioning at IFIC. …”
Published 2018
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7“…The surfaces exposed to high pulsed RF (Radio Frequency) currents are subject to cyclic thermal stresses which are expected to induce surface break up by fatigue. …”
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8by Obermair, Christoph, Cartier-Michaud, Thomas, Apollonio, Andrea, Millar, William, Felsberger, Lukas, Fischl, Lorenz, Bovbjerg, Holger Severin, Wollmann, Daniel, Wuensch, Walter, Catalan-Lasheras, Nuria, Boronat, Marçà, Pernkopf, Franz, Burt, Graeme“…The occurrence of vacuum arcs or radio frequency (rf) breakdowns is one of the most prevalent factors limiting the high-gradient performance of normal conducting rf cavities in particle accelerators. …”
Published 2022
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9by Jacewicz, Marek, Eriksson, Johan, Ruber, Roger, Calatroni, Sergio, Profatilova, Iaroslava, Wuensch, Walter“…These results provide important experimental input for the development of quantitative theories and models of high-field processes as well as practical input for cryogenic radio-frequency systems.…”
Published 2020
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10“…A novel quantity for predicting the high-gradient performance of radio frequency accelerating structures is presented. …”
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11“…Radio frequency breakdown rate is a crucial performance parameter that ensures that the design luminosity is achieved in the CLIC linear collider. …”
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12by Aghayan, Mahdi, Masoudi, S Farhad, Ghasemi, Farshad, Wuensch, Walter, Shaker, Hamed“…Vacuum breakdown is one of the main limitations to the operating accelerating gradient in radio frequency linear accelerators. Recent studies of copper cavities have been shown that harder copper conditions more quickly and can reach higher accelerating gradients than soft copper cavities. …”
Published 2021
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13by Obermair, Christoph, Apollonio, Andrea, Cartier-Michaud, Thomas, Catalán Lasheras, Nuria, Felsberger, Lukas, Millar, William L, Pernkopf, Franz, Wuensch, Walter“…Radio Frequency (RF) breakdowns are one of the most prevalent limits in RF cavities for particle accelerators. …”
Published 2021
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14by Vnuchenko, Anna, Argyropoulos, Theodoros, Blanch Gutiérrez, Cesar, Catalán Lasheras, Nuria, Esperante Pereira, Daniel, Faus-Golfe, Angeles, Giner Navarro, Jorge, McMonagle, Gerard, Syratchev, Igor, Wuensch, Walter“…The IFIC High-Gradient (HG) Radio Frequency (RF) laboratory is designed to host a high-power infrastructure for testing HG S-band normal-conducting RF accelerating structures and has been under construction since 2016. …”
Published 2017
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15by Profatilova, Iaroslava, Stragier, Xavier, Calatroni, Sergio, Kandratsyeu, Aleh, Rodriguez Castro, Enrique, Wuensch, Walter“…Breakdown localisation is an important diagnostic for studies of vacuum arcs in high electromagnetic field systems such as DC electrodes and radio frequency (RF) accelerating structures. For example, determining the position of individual breakdowns and corresponding distributions of ensembles of breakdowns are important measurements in high-gradient X-band test stands (CERN, SLAC, KEK) where these measurements are made by monitoring the RF signals.A highly precise breakdown localisation technique has been developed for the CLIC (Compact LInear Collider) pulsed DC electrode systems. …”
Published 2020
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16by Melcón, Alejandro Álvarez, Cuendis, Sergio Arguedas, Cogollos, Cristian, Díaz-Morcillo, Alejandro, Döbrich, Babette, Gallego, Juan Daniel, Gimeno, Benito, Irastorza, Igor G., Lozano-Guerrero, Antonio José, Malbrunot, Chloé, Navarro, Pablo, Peña-Garay, Carlos, Redondo, Javier, Vafeiadis, Theodoros, Wuensch, Walter“…Our haloscope consists of an array of small microwave cavities connected by rectangular irises, in an arrangement commonly used in radio-frequency filters. The size of the unit cavity determines the main resonant frequency, while the possibility to connect a large number of cavities allows to reach large detection volumes. …”
Published 2018
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17by Korsbäck, Anders, Morales, Laura Mercadé, Profatilova, Iaroslava, Djurabekova, Flyura, Rodriguez Castro, Enrique, Wuensch, Walter, Ahlgren, Tommy, Calatroni, Sergio“…This is, for instance, seen during the initial operation of radio frequency (rf) cavities in particle accelerators. …”
Published 2019
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18by Da Palma Serafim, Catarina, Bellodi, Giulia, Calatroni, Sergio, Djurabekova, Flyura, Grudiev, Alexej, Lombardi, Alessandra, Peacock, Ruth, Perez Fontenla, Ana Teresa, Ramberger, Suitbert, Sargsyan, Edgar, Sgobba, Stefano, Wuensch, Walter“…During operation the RFQ (Radio-Frequency-Quadrupole) of the LINAC4 at CERN is exposed to high electric fields which can lead to vacuum breakdown. …”
Published 2022
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19Pulsed DC High Field Measurements of Irradiated and Non-Irradiated Electrodes of Different Materialsby Peacock, Ruth, Bellodi, Giulia, Burt, Graeme, Calatroni, Sergio, Da Palma Serafim, Catarina, Grudiev, Alexej, Lombardi, Alessandra, Perez Fontenla, Ana Teresa, Ramberger, Suitbert, Sargsyan, Edgar, Sgobba, Stefano, Wuensch, Walter“…Beam loss occurs in Radio Frequency Quadrupoles (RFQ), and has been observed in the H⁻ linear accelerator Linac4 (L4) at CERN. …”
Published 2022
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20by Zennaro, Riccardo, Argyropoulos, Theodoros, Blumer, Heinrich, Bopp, Markus, Catalán Lasheras, Nuria, Esperante Pereira, Daniel, Garvey, Terence, Grudiev, Alexej, Lucas, Thomas, McMonagle, Gerard, Rivkin, Leonid, Solodko, Anastasiya, Syratchev, Igor, Volpi, Matteo, Wegner, Rolf, Woolley, Benjamin, Wuensch, Walter“…We present the design, construction and high-power test of an X-band radio-frequency accelerating structure, built as a prototype for the CERN LInear Collider (CLIC) study. …”
Published 2017
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