CERN Accelerating science

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1.
Mechanical Design of the Beam Gas Ionisation (BGI) Beam Profile Monitor for CERN Super Proton Synchrotron / Ramos Garcia, Maria Teresa (CERN) ; Andreazza, William (CERN) ; Bestmann, Patrick (CERN) ; Bursali, Hikmet (CERN) ; Chritin, Nicolas (CERN) ; Devauchelle, Wilfried (CERN) ; Harrison, Anthony (CERN) ; Khatri, Ghanshyambhai (CERN) ; McLean, Mark (CERN) ; Pasquino, Chiara (CERN) et al.
The Beam Gas Ionisation (BGI) instrument of the Proton Synchrotron (PS), presently installed and operational, has been re-designed for the Super Proton Synchrotron (SPS), the following machine along the Large Hadron Collider (LHC) injector chain at CERN accelerator complex. Using the same detection technology, Timepix3, the SPS-BGI infers the beam profile from the electrons created by the ionisation of rest gas molecules and accelerated onto an imaging detector. [...]
2024 - 4 p. - Published in : JACoW MEDSI 2023 (2024) 114-117 Fulltext: PDF;
In : 12th Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation (MEDSI 2023), Beijing, China, 6 - 10 Nov 2023, pp.114-117
2.
SPS-Scraper Longitudinal Impedance Simulation and Measurement Report / Bursali, Hikmet (CERN) ; De La Fuente Garcia, Elena (Universidad Politecnica de Madrid (ES)) ; Salvant, Benoit (CERN) ; Vollinger, Christine (CERN)
This report presents the longitudinal impedance mitigation study of the 4th version of SPS Transverse Beam Scraper [...]
CERN-ACC-NOTE-2025-0015.
- 2025
Full text
3.
Impedance reduction of the beam gas ionization monitors for the CERN SPS / Bursali, Hikmet (CERN) ; Andreazza, William (CERN) ; Khatri, Ghanshyambhai (CERN) ; Ramos Garcia, Maria Teresa (CERN) ; Storey, James (CERN) ; Vollenberg, Wil (CERN) ; Vollinger, Christine (CERN)
The beam gas ionization monitors (BGIs) are non-destructive instruments to measure the transverse beam profiles. With the goal to double the beam intensity in the injector chain for the High-Luminosity Large Hadron Collider (HL-LHC), any element contributing to the overall beam coupling impedance requires an in-depth impedance evaluation from the design stage. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) THPC54 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPC54
4.
Simulation and RF Measurement Report to Determine the Longitudinal Beam Coupling Impedance in the SPS-BGI / Bursali, Hikmet (CERN) ; Vollinger, Christine (CERN)
The Beam Gas Ionization (BGI) monitors are non-destructive beam diagnostic devices to measure the transverse beam profiles in the horizontal and vertical planes. [...]
CERN-ACC-NOTE-2024-0014.
- 2024. - 22 p.
Full text
5.
CLIC Wake Field Monitor as a detuned Cavity Beam Position Monitor: Explanation of center offset between TE and TM channels in the TD26 structure / Sjobak, Kyrre Ness (Oslo U. ; CERN) ; Bursali, Hikmet (CERN ; U. Rome La Sapienza (main)) ; Gillardi, Antonio (CERN ; U. Naples (main)) ; Lillestøl, Reidar (Oslo U.) ; Farabolini, Wilfrid (CERN) ; Doebert, Steffen (CERN) ; Adli, Erik (Oslo U.) ; Lasheras, Nuria Catalan (CERN) ; Corsini, Roberto (CERN)
The Wake Field Monitor (WFM) system installed on the CLIC prototype accelerating structure in CERN Linear Accelerator for Research (CLEAR) has two channels for each horizontal/vertical plane, operating at different frequencies. [...]
arXiv:2307.06681.
- 16 p.
Fulltext
6.
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 Fulltext: PDF;
7.
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
8.
Study of Novel Devices for Compact Accelerating Structures / Bursali, Hikmet
Recent developments in high gradient acceleration and compact electron linacs have demonstrated the capability to reach relatively high electron beam energy in a small space by considering the budget and realization issues [...]
CERN-THESIS-2022-055 - 76.

9.
X-Band RF Spiral Load Optimization for Additive Manufacturing Mass Production / Bursali, Hikmet (CERN ; Rome U.) ; Catalán Lasheras, Nuria (CERN) ; Gerard, Romain Louis (CERN) ; Grudiev, Alexej (CERN) ; Gumenyuk, Oleg (CERN) ; Morales Sánchez, Pedro (CERN) ; Riffaud, Benoit (CERN) ; Sauza-Bedolla, Joel (Lancaster U.)
The CLIC main linac uses X-band traveling-wave normal conducting accelerating structures. The RF power not used for beam acceleration nor dissipated in the resistive wall is absorbed in two high power RF loads that should be as compact as possible to minimize the total footprint of the machine. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 1143-1146 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1143-1146
10.
A Compact, Low-Field, Broadband Matching Section for Externally-Powered X-Band Dielectric-Loaded Accelerating Structures / Wei, Yelong (CERN ; Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Bursali, Hikmet (Rome U.) ; Catalán Lasheras, Nuria (CERN) ; Freemire, Ben (Euclid Techlabs, Solon) ; González Antón, Sergio (CERN) ; Grudiev, Alexej (CERN) ; Jing, Chunguang (Euclid Techlabs, Solon) ; Sauza-Bedolla, Joel (Lancaster U.) ; Wegner, Rolf (CERN) ; Welsch, Carsten P (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.)
It has been technically challenging to efficiently couple external radiofrequency (RF) power to cylindrical dielectric-loaded accelerating (DLA) structures. This is especially true when the DLA structure has a high dielectric constant. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 495-498 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.495-498

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