HB2023 - List of Keywords (flattop)

Paper	Title	Other Keywords	Page
THC2C1	Shower Simulations for the CERN Proton Synchrotron Internal Dump and Comparison with Beam Loss Monitor Data	simulation, proton, closed-orbit, operation	389
	S. Niang, L.S. Esposito, M. Giovannozzi, C. Hernalsteens, A. Huschauer, T. Pugnat CERN, Meyrin, Switzerland D. Domange ULB, Bruxelles, Belgium
	During the Long Shutdown 2 (LS2), two new internal dumps (TDIs) were installed and successfully put into operation in the CERN Proton Synchrotron (PS) to withstand the intense and bright beams produced for the High Luminosity LHC. TDIs serve as safety devices designed to rapidly enter the beam trajectory and stop the beam over multiple turns. Due to their design, the TDI only absorbs a fraction of the secondary particle shower produced by beam particles that impinge on it. Starting from impacts computed by multi-turn beam dynamics simulations, detailed shower simulations were performed with FLUKA to assess the radiation field’s impact on the downstream equipment, with a particular emphasis on the dose measured by Beam Loss Monitors. The numerical data obtained from the simulations are compared with the experimental data collected during PS operation.
	Slides THC2C1 [2.092 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-THC2C1
About •	Received ※ 28 September 2023 — Revised ※ 09 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 29 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THBP05	CERN SPS Dilution Kicker Vacuum Pressure Behaviour under Unprecedented Beam Brightness	kicker, vacuum, operation, brightness	447
	F.M. Velotti, M.J. Barnes, W. Bartmann, H. Bartosik, E. Carlier, G. Favia, I. Karpov, K.S.B. Li, N. Magnin, L. Mether, V. Senaj, P. Van Trappen, C. Zannini CERN, Meyrin, Switzerland
	The Super Proton Synchrotron (SPS) is the second largest synchrotron at CERN and produces high-brightness beams for the Large Hadron Collider (LHC). Recently, the dilution kicker (MKDH) of the SPS beam dump system (SBDS) has demonstrated unanticipated behaviour under high beam brightness conditions. During the 2022 and 2023 beam commissioning, the MKDH, which is routinely pulsed at high voltage, was subjected to intensities of up to 288 bunches of 2·10¹¹ protons per bunch and bunch lengths as low as 1.5 ns. Under these conditions, all the SPS kickers and septa exhibited a rapid vacuum pressure rise and a significant temperature increase with the MKDH playing the dominant effect in restricting the maximum line density that can be attained. This paper presents the results of the collected data, emphasizes the dependence on beam parameters, and introduces a probabilistic model to illustrate the effect of MKDH conditioning observed to forecast the pressure behaviour. Finally, potential countermeasures and outlook are discussed.
	Poster THBP05 [1.913 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP05
About •	Received ※ 29 September 2023 — Revised ※ 07 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 19 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

THC2C1

Shower Simulations for the CERN Proton Synchrotron Internal Dump and Comparison with Beam Loss Monitor Data

simulation, proton, closed-orbit, operation

389

S. Niang, L.S. Esposito, M. Giovannozzi, C. Hernalsteens, A. Huschauer, T. Pugnat
CERN, Meyrin, Switzerland
D. Domange
ULB, Bruxelles, Belgium

During the Long Shutdown 2 (LS2), two new internal dumps (TDIs) were installed and successfully put into operation in the CERN Proton Synchrotron (PS) to withstand the intense and bright beams produced for the High Luminosity LHC. TDIs serve as safety devices designed to rapidly enter the beam trajectory and stop the beam over multiple turns. Due to their design, the TDI only absorbs a fraction of the secondary particle shower produced by beam particles that impinge on it. Starting from impacts computed by multi-turn beam dynamics simulations, detailed shower simulations were performed with FLUKA to assess the radiation field’s impact on the downstream equipment, with a particular emphasis on the dose measured by Beam Loss Monitors. The numerical data obtained from the simulations are compared with the experimental data collected during PS operation.

Slides THC2C1 [2.092 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-THC2C1

About •

Received ※ 28 September 2023 — Revised ※ 09 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 29 October 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THBP05

CERN SPS Dilution Kicker Vacuum Pressure Behaviour under Unprecedented Beam Brightness

kicker, vacuum, operation, brightness

447

F.M. Velotti, M.J. Barnes, W. Bartmann, H. Bartosik, E. Carlier, G. Favia, I. Karpov, K.S.B. Li, N. Magnin, L. Mether, V. Senaj, P. Van Trappen, C. Zannini
CERN, Meyrin, Switzerland

The Super Proton Synchrotron (SPS) is the second largest synchrotron at CERN and produces high-brightness beams for the Large Hadron Collider (LHC). Recently, the dilution kicker (MKDH) of the SPS beam dump system (SBDS) has demonstrated unanticipated behaviour under high beam brightness conditions. During the 2022 and 2023 beam commissioning, the MKDH, which is routinely pulsed at high voltage, was subjected to intensities of up to 288 bunches of 2·10¹¹ protons per bunch and bunch lengths as low as 1.5 ns. Under these conditions, all the SPS kickers and septa exhibited a rapid vacuum pressure rise and a significant temperature increase with the MKDH playing the dominant effect in restricting the maximum line density that can be attained. This paper presents the results of the collected data, emphasizes the dependence on beam parameters, and introduces a probabilistic model to illustrate the effect of MKDH conditioning observed to forecast the pressure behaviour. Finally, potential countermeasures and outlook are discussed.

Poster THBP05 [1.913 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP05

About •

Received ※ 29 September 2023 — Revised ※ 07 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 19 October 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)