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1.
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Beam-based commissioning of a novel X-band transverse deflection structure with variable polarization
/ González Caminal, P (DESY) ; Christie, F (DESY) ; D'Arcy, R (DESY) ; Jaster-Merz, S M (DESY) ; Assmann, R (DESY) ; Burkart, F (DESY) ; Conrad, B (DESY) ; Dinter, H (DESY) ; Foese, M (DESY) ; Herrmann, J (DESY) et al.
Longitudinal electron-beam diagnostics play a critical role in the operation and control of x-ray free-electron lasers, which rely on parameters such as the current profile, the longitudinal phase space, or the slice emittance of the particle distribution. On the one hand, the femtosecond-scale electron bunches produced at these facilities impose stringent requirements on the resolution achievable with the diagnostics. [...]
2024 - 19 p.
- Published in : Phys. Rev. Accel. Beams 27 (2024) 032801
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RADES axion search results with a High-Temperature Superconducting cavity in an 11.7 T magnet
/ Ahyoune, S. (ICC, Barcelona U.) ; Álvarez Melcón, A. (Cartagena Politecnica U.) ; Cuendis, S. Arguedas (ICC, Barcelona U.) ; Calatroni, S. (CERN) ; Cogollos, C. (Garching, Max Planck Inst.) ; Díaz-Morcillo, A. (Cartagena Politecnica U.) ; Döbrich, B. (Garching, Max Planck Inst.) ; Gallego, J.D. (Yerkes Observ.) ; García-Barceló, J.M. (Garching, Max Planck Inst.) ; Gimeno, B. (Valencia U., IFIC) et al.
We describe the results of a haloscope axion search performed with an 11.7 T dipole magnet at CERN. [...]
arXiv:2403.07790 ; CERN-EP-2024-076 ; MPP-2024-55.
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2024. - 19 p.
Full text - Draft (restricted) - Fulltext
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High-Power Test of Two Prototype X-Band Accelerating Structures Based on SwissFEL Fabrication Technology
/ Millar, William L (CERN) ; Grudiev, Alexej (CERN) ; Wuensch, Walter (CERN) ; Lasheras, Nuria Catalan (CERN) ; McMonagle, Gerard (CERN) ; Zennaro, Riccardo (PSI, Villigen) ; Craievich, Paolo (PSI, Villigen) ; Bopp, Markus (PSI, Villigen) ; Lucas, Thomas G (PSI, Villigen) ; Volpi, Matteo (CERN ; Melbourne U.) et al.
This article presents the design, construction, and high-power test of two X -band radio frequency (RF) accelerating structures built as part of a collaboration between CERN and the Paul Scherrer Institute (PSI) for the compact linear collider (CLIC) study. The structures are a modified “tuning-free” variant of an existing CERN design and were assembled using Swiss free electron laser (SwissFEL) production methods. [...]
2023 - 19 p.
- Published in : IEEE Trans. Nucl. Sci. 70 (2023) 1-19
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Machine Learning Models for Breakdown Prediction in RF Cavities for Accelerators
/ Obermair, Christoph (CERN ; Graz, Tech. U.) ; Apollonio, Andrea (CERN) ; Cartier-Michaud, Thomas (CERN) ; Catalán Lasheras, Nuria (CERN) ; Felsberger, Lukas (CERN) ; Millar, William L (CERN) ; Pernkopf, Franz (CERN ; Graz, Tech. U.) ; Wuensch, Walter (CERN)
Radio Frequency (RF) breakdowns are one of the most prevalent limits in RF cavities for particle accelerators. During a breakdown, field enhancement associated with small deformations on the cavity surface results in electrical arcs. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 1068-1071
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1068-1071
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5.
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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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6.
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Thin Film (High Temperature) Superconducting Radiofrequency Cavities for the Search of Axion Dark Matter
/ Golm, J. (CERN) ; Arguedas Cuendis, S. (CERN) ; Calatroni, S. (CERN) ; Cogollos, C. (ICC, Barcelona U.) ; Döbrich, B. (CERN) ; Gallego, J.D. (Yebes Astron. Ctr.) ; García Barceló, J.M. (Cartagena Politecnica U.) ; Granados, X. (Barcelona, Autonoma U.) ; Gutierrez, J. (Barcelona, Autonoma U.) ; Irastorza, I.G. (Zaragoza U.) et al.
The axion is a hypothetical particle which is a candidate for cold dark matter. Haloscope experiments directly search for these particles in strong magnetic fields with RF cavities as detectors. [...]
arXiv:2110.01296.-
2022-06 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 32 (2022) 1500605
Fulltext: PDF;
In : 15th European Conference on Applied Superconductivity (EUCAS 2021), Online, 5 - 9 Sep 2021, pp.1500605
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7.
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High-gradient behavior of a dipole-mode rf structure
/ Woolley, B (Lancaster U. ; CERN) ; Burt, G (Lancaster U.) ; Dexter, A C (Lancaster U.) ; Peacock, R (Lancaster U.) ; Millar, W L (Lancaster U.) ; Catalan Lasheras, N (CERN) ; Degiovanni, A (CERN) ; Grudiev, A (CERN) ; Mcmonagle, G (CERN) ; Syratchev, I (CERN) et al.
A normal-conducting, X-band traveling wave structure operating in the dipole mode has been systematically high-gradient tested to gain insight into the maximum possible gradients in these types of structure. Measured structure conditioning, breakdown behavior, and achieved surface fields are reported as well as a postmortem analysis of the breakdown position and a scanning electron microscope analysis of the high-field surfaces. [...]
2020 - 11 p.
- Published in : Phys. Rev. Accel. Beams 23 (2020) 122002
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Novel $X$ -band transverse deflection structure with variable polarization
/ Craievich, P (PSI, Villigen) ; Bopp, M (PSI, Villigen) ; Braun, H H (PSI, Villigen) ; Citterio, A (PSI, Villigen) ; Fortunati, R (PSI, Villigen) ; Ganter, R (PSI, Villigen) ; Kleeb, T (PSI, Villigen) ; Marcellini, F (PSI, Villigen) ; Pedrozzi, M (PSI, Villigen) ; Prat, E (PSI, Villigen) et al.
A collaboration between DESY, PSI and CERN has developed and built an advanced modular X-band transverse deflection structure (TDS) system with the new feature of providing variable polarization of the deflecting force. The prototype of the novel X-band TDS, the polarizable $X$-band (PolariX) TDS, was fabricated at PSI following the high-precision tuning-free production process developed for the C-band Linac of the SwissFEL project. [...]
2020 - 22 p.
- Published in : Phys. Rev. Accel. Beams 23 (2020) 112001
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Demonstration of a cavity-based pulse compression system for pulse shape correction
/ Jiang, Yuliang (Tsinghua U., Beijing) ; Zha, Hao (Tsinghua U., Beijing) ; Wang, Ping (Tsinghua U., Beijing) ; Shi, Jiaru (Tsinghua U., Beijing) ; Chen, Huaibi (Tsinghua U., Beijing) ; Millar, William L (CERN ; Cockcroft Inst. Accel. Sci. Tech.) ; Syratchev, Igor (CERN)
A compact X-band correction cavity chain (CC) has been successfully designed, fabricated and high power tested for the Compact Linear Collider (CLIC) project. The CC consists of eight spherical cavities and four polarizers, and each spherical cavity has a $Q_0$ of 45 000 and a diameter of 7 cm. [...]
2019 - 6 p.
- Published in : Phys. Rev. Accel. Beams 22 (2019) 082001
External link: Fulltext
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