Keyword: luminosity
Paper Title Other Keywords Page
TU1I01 Beam Instrumentation Challenges for High-Energy and Low-Emittance Beam at SuperKEKB feedback, detector, radiation, electron 131
  • G. Mitsuka
    KEK, Ibaraki, Japan
  The SuperKEKB electron-positron collider, which started the commissioning in February 2016, is a luminosity frontier machine for the search for new physics. In this presentation, we review the main challenges we face for the high-energy and low-emittance beam at SuperKEKB, fast and low-noise beam-orbit feedback system, X-ray beam-profile monitors for measurements for the beam size of ¿10 um, novel diamond mirrors with extremely high thermal conductivity for extracting synchrotron radiation, and various type’s beam loss diagnostics for the identification or possibly early detection of sudden beam losses. This presentation includes future directions of the R&D–-X-ray interferometry for micron-level beam size measurements and fast optics measurements with the gated turn-by-turn BPMs–-towards next-generation light source facilities and high-energy colliders.  
slides icon Slides TU1I01 [5.927 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU1I01  
About • Received ※ 06 September 2023 — Revised ※ 13 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 27 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TU3C03 Collimator Scan Based Beam Halo Measurements in LHC and HL-LHC betatron, emittance, operation, collimation 164
  • P.D. Hermes, M. Giovannozzi, C.E. Montanari, S. Morales Vigo, S. Redaelli, B. Salvachúa
    CERN, Meyrin, Switzerland
  • M. Rakic
    EPFL, Lausanne, Switzerland
  Measurements in the CERN Large Hadron Collider (LHC) have indicated that the population of the transverse beam halo is greater than that of a Gaussian distribution. With the upcoming High Luminosity upgrade (HL-LHC), the stored beam energy in the beam halo could become large enough to threaten the integrity of the collimation system. Considerable efforts during the ongoing LHC Run 3 are dedicated to characterising the transverse beam halo, and its diffusion properties, after the LHC Injector Upgrade (LIU) in preparation for HL-LHC operation. Given the unprecedented stored beam energies of about 400MJ, presently achieved at the LHC, and about 700MJ planned at the HL-LHC, conventional measurements are difficult. Halo and diffusion measurements are currently based on collimator scans, where robust collimators are inserted in steps into the circulating beam halo. In this contribution, we present techniques for halo characterisation employed in LHC and compare results obtained from such measurements in LHC Run 2 and the ongoing LHC Run 3. We present plans for measurements in the remainder of LHC Run 3 and describe expected challenges for halo quantification in HL-LHC.  
slides icon Slides TU3C03 [5.876 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU3C03  
About • Received ※ 05 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 12 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUP002 Development of Bunch Position Monitors to Observe Sudden Beam Loss of SuperKEKB Rings feedback, detector, operation, vacuum 179
  • M. Tobiyama, H. Ikeda, G. Mitsuka
    KEK, Ibaraki, Japan
  In the SuperKEKB rings, we have encountered extremely-fast beam losses occurring primarily within one to two turns in some parts of the bunch train. Such ¿sudden beam loss¿ induced severe failure in the vertical collimator heads, quenches on the superconducting final quadrupoles, and damage on the Belle II detector in some cases. Thus it is essential to investigate the cause and take countermeasures. This paper presents the phenomena clarified by the bunch current and position monitor of the bunch feedback system. The upgrade plan for the existing monitor, and recently developed simple monitors installed in the suspected area is also introduced.  
poster icon Poster TUP002 [0.727 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP002  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)