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A rapid method for prediction of the non-resonant ultra-fast multipactor regime in high gradient RF accelerating structures
/ González-Iglesias, Daniel (Valencia U., IFIC) ; Gimeno, Benito (Valencia U., IFIC) ; Esperante, Daniel (Valencia U., IFIC) ; Martinez-Reviriego, Pablo (Valencia U., IFIC) ; Martín-Luna, Pablo (Valencia U., IFIC) ; Pedraza, Laura Karina (Valencia U., IFIC) ; Fernández, Juan Carlos (Valencia U., IFIC) ; Fuster-Martínez, Nuria (Valencia U., IFIC) ; Martínez, Eduardo (Valencia U., IFIC) ; Boronat, Marçà (Valencia U., IFIC) et al.
The purpose of this work is to present an analytical method that allows to estimate in an approximate and fast way the presence of the non-resonant and ultra-fast multipactor effect in RF accelerating structures in the presence of high gradient electromagnetic fields. This single-surface multipactor regime, which has been little studied in the scientific literature, is characterised by appearing only under conditions of very strong RF electric fields (of the order of tens or hundreds of MV/m), where it is predominant over other types of single- or dual-surface resonance described in classical multipactor theory. [...]
2024 - 9 p.
- Published in : Results Phys. 64 (2024) 107921
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Radiation Shielding Design for the X-Band Laboratory for Radio-Frequency Test Facility - X-Lab - at the University of Melbourne
/ Volpi, Matteo (Melbourne U.) ; Banon-Caballero, David (Valencia U., IFIC) ; Boronat, Marça (CERN) ; Catalán Lasheras, Nuria (CERN) ; Dowd, Rohan (ANSTO, Menai) ; Rassool, Roger (Melbourne U.) ; Sheehy, Suzanne (Melbourne U.) ; Taylor, Geoffrey (Melbourne U.) ; Williams, Scott (Melbourne U.)
Here we report radiation dose estimates calculated for the X-band Laboratory for Accelerators and Beams (X-LAB) under construction at the University of Melbourne (UoM). The lab will host a CERN X-band test stand containing two 12 GHz 6 MW klystron amplifiers. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 724-727
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.724-727
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First Operation of a Klystron Fitted with a Superconducting MgB₂ Solenoid
/ Catalán Lasheras, Nuria (CERN) ; Baig, Anisullah (Cockcroft Inst. Accel. Sci. Tech.) ; Boronat, Marça (CERN) ; Castilla, Alejandro (Cockcroft Inst. Accel. Sci. Tech.) ; Kimura, Takuji (CPI, Palo Alto) ; Kolda, Peter (CPI, Palo Alto) ; McMonagle, Gerard (CERN) ; Michizono, Shinichiro (KEK, Tsukuba) ; Syratchev, Igor (CERN) ; Yamamoto, Akira (KEK, Tsukuba)
As part of the effort to reduce the energy consumption of large research facilities using accelerators, high efficiency klystrons are being developed by CERN. However, a large fraction of the wall-plug power required to operate these klystrons is used in the focusing magnetic elements around the klystron in the form of normal conducting solenoids. [...]
2022 - 3 p.
- Published in : JACoW IPAC 2022 (2022) 3138-3140
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.3138-3140
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High-Power Testing Results of X-Band RF-Window and 45 Degrees Spiral Load
/ Boronat, Marça (CERN) ; Bursali, Hikmet (CERN) ; Catalán Lasheras, Nuria (CERN) ; Grudiev, Alexej (CERN) ; McMonagle, Gerard (CERN) ; Syratchev, Igor (CERN)
The X-Band test facilities at CERN have been running for some years now qualifying CLIC structure prototypes, but also developing and testing high power general-purpose X-Band components, used in a wide range of applications. Driven by operational needs, several components have been redesigned and tested aiming to optimize the reliability and the compactness of the full system and therefore enhancing the accessibility of this technology inside and outside CERN. [...]
2022 - 4 p.
- Published in : JACoW LINAC 2022 (2022) 279-282
Fulltext: PDF;
In : 31st Linear Accelerator Conference (LINAC22), Liverpool, UK, 28 Aug - 2 Sep 2022, pp.279-282
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High-Gradient Breakdown Studies of an X-Band Accelerating Structure Operated in the Reversed Taper Direction
/ Wu, Xiaowei (CERN) ; Boronat Arévalo, Marçà Josep (CERN) ; Castilla, Alejandro (CERN) ; Catalán Lasheras, Núria (CERN) ; Edwards, Amelia V (CERN) ; Grudiev, Alexej (CERN) ; McMonagle, Gerard (CERN) ; Millar, William L (CERN) ; Syratchev, Igor (CERN) ; Wuensch, Walter (CERN)
The results of high-gradient tests of a tapered X-band traveling-wave accelerator structure powered in reversed direction are presented. Powering the tapered structure from the small aperture, normally output, at the end of the structure provides unique conditions for the study of gradient limits. [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 1543-1546
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1543-1546
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Explainable Machine Learning for Breakdown Prediction in High Gradient RF Cavities
/ Obermair, Christoph (CERN ; Graz U.) ; Cartier-Michaud, Thomas (CERN) ; Apollonio, Andrea (CERN) ; Millar, William (CERN) ; Felsberger, Lukas (CERN) ; Fischl, Lorenz (CERN) ; Bovbjerg, Holger Severin (CERN) ; Wollmann, Daniel (CERN) ; Wuensch, Walter (CERN) ; Catalan-Lasheras, Nuria (CERN) et al.
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. In this paper, we search for the existence of previously unrecognized features related to the incidence of rf breakdowns by applying a machine learning strategy to high-gradient cavity data from CERN's test stand for the Compact Linear Collider (CLIC). [...]
arXiv:2202.05610.-
2022-10-03 - 18 p.
- Published in : Phys. Rev. Accel. Beams 25 (2022) 104601
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Top quark mass measurement in radiative events at electron-positron colliders
/ Boronat, Marca (Univ. of Valencia and CSIC (ES)) ; Fullana Torregrosa, Esteban (Univ. of Valencia and CSIC (ES)) ; Fuster Verdu, Juan (Univ. of Valencia and CSIC (ES)) ; Gomis Lopez, Pablo (Univ. of Valencia and CSIC (ES)) ; Vos, Marcel (Univ. of Valencia and CSIC (ES)) ; Hoang, A H (University of Vienna, Faculty of Physics and Erwin Schrodinger International Institute for Mathematical Physics) ; Widl, A (University of Vienna, Faculty of Physics) ; Mateu, V (Departmento de Fisica Fundamental e IUFFyM, Universidad de Salamanca and Instituto de Fisica Teorica UAM-CSIC)
In this letter, the potential of linear e+e− colliders to measure the top quark mass in a suitable short-distance scheme in radiative events is evaluated. We present a calculation of the differential cross section for production of a top quark pair in association with an energetic photon from initial state radiation, as a function of the invariant mass of the tt ̄system [...]
CLICdp-Pub-2019-005.-
Geneva : CERN, 2020 - 12.
- Published in : Phys. Lett. B 804 (2020) 135353
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Dark current analysis at CERN’s X-band facility
/ Banon Caballero, David (Valencia U., IFIC ; CERN) ; Boronat, Marça (Valencia U., IFIC ; CERN) ; Catalán Lasheras, Nuria (CERN) ; Faus-Golfe, Angeles (Orsay, LAL) ; Gimeno, Benito (Valencia U., IFIC) ; Lucas, Thomas (Melbourne U. ; CERN) ; Millar, William (Lancaster U. ; CERN) ; Paszkiewicz, Jan (U. Oxford (main) ; CERN) ; Pitman, Sam (CERN) ; Sánchez, Victoria (Valencia U., IFIC ; CERN) et al.
Dark current is particularly relevant during operation in high-gradient linear accelerators. Resulting from the capture of field emitted electrons, dark current produces additional radiation that needs to be accounted for in experiments. [...]
CERN-ACC-2019-212; CERN-ACC-2019-270; CLIC-Note-1190.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPRB059
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPRB059
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Construction and Commissioning of the S-Band High-Gradient RF Laboratory at IFIC
/ Esperante Pereira, Daniel (Valencia U., IFIC) ; Blanch Gutiérrez, Cesar (Valencia U., IFIC) ; Boronat, Marça (Valencia U., IFIC) ; Fuster, Juan (Valencia U., IFIC) ; Gonzalez Iglesias, Daniel (Valencia U., IFIC) ; Vnuchenko, Anna (Valencia U., IFIC) ; Catalán Lasheras, Nuria (CERN) ; Gimeno, Benito (Valencia U.) ; McMonagle, Gerard (CERN) ; Syratchev, Igor (CERN) et al.
An S-band High-Gradient (HG) Radio Frequency (RF) laboratory is under construction and commissioning at IFIC. The purpose of the laboratory is to perform investigations of high-gradient phenomena and to develop normal-conducting RF technology, with special focus on RF systems for hadron-therapy. [...]
CERN-ACC-2018-158; CLIC-Note-1151.-
2018 - 6 p.
- Published in : (2018) , pp. THPAL005
- Published in : J. Phys.: Conf. Ser.
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAL005
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