Author: Chance, A.    [Chancé, A.]
Paper Title Page
THBP43 Intensity Effects in a Chain of Muon RCSs 579
 
  • F. Batsch, D. Amorim, H. Damerau, A. Grudiev, I. Karpov, E. Métral, D. Schulte
    CERN, Meyrin, Switzerland
  • A. Chancé
    CEA, Gif-sur-Yvette, France
  • S. Udongwo
    Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany
 
  Funding: Funded by the European Union under Grant Agreement n.101094300
The muon collider offers an attractive path to a compact, multi-TeV lepton collider. However, the short muon lifetime leads to stringent requirements on the fast energy increase. While extreme energy gains in the order of several GeV per turn are crucial for a high elevated muon survival rate, ultra-short and intense bunches are needed to achieve large luminosity. The longitudinal beam dynamics of a chain of rapid cycling synchrotrons (RCS) for acceleration from around 60 GeV to several TeV is being investigated in the framework of the International Muon Collider Collaboration. Each RCS must have a distributed radio-frequency (RF) system with several hundred RF stations to establish stable synchrotron motion. In this contribution, the beam-induced voltage in each RCS is studied, assuming a single high-intensity bunch per beam in each direction and ILC-like 1.3 GHz accelerating structures. The impact of single- and multi-turn wakefields on longitudinal stability and RF power requirements is analysed with particle tracking simulations. Special attention is moreover paid to the beam power deposited into the higher-order modes of the RF cavities.
 
poster icon Poster THBP43 [1.345 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP43  
About • Received ※ 29 September 2023 — Revised ※ 05 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 10 October 2023
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THBP17 Transverse Coherent Instability Studies for the High-Energy Part of the Muon Collider Complex 491
 
  • D. Amorim, F. Batsch, L. Bottura, D. Calzolari, C. Carli, H. Damerau, A. Grudiev, A. Lechner, E. Métral, D. Schulte, K. Skoufaris
    CERN, Meyrin, Switzerland
  • A. Chancé
    CEA-DRF-IRFU, France
  • T. Pieloni
    EPFL, Lausanne, Switzerland
 
  Funding: This project has received funding from the European Union¿s Research and Innovation programme under GA No 101094300 and the Swiss Accelerator Research and Technology (CHART) program (www.chart.ch).
The International Muon Collider Collaboration (IMCC) is studying a 3 TeV center-of-mass muon collider ring, as well as a possible next stage at 10 TeV. Muons being 200 times heavier than electrons, limitations from synchrotron radiation are mostly suppressed, but the muon decay drives the accelerator chain design. After the muon and anti-muon bunches are produced and 6D cooled, a series of Linac, recirculating Linac and Rapid Cycling Synchrotron (RCS) quickly accelerate the bunches before the collider ring. A large number of RF cavities are required in the RCS to ensure that over 90% of the muons survive in each ring. The effects of cavities higher-order modes on transverse coherent stability have been looked at in detail, including the one of a bunch offset in the cavities, along with possible mitigation measures. In the collider ring, the decay of high-energy muons is a challenge for heat load management and radiation shielding. A tungsten liner would protect the superconducting magnet from decay products. Impedance and related beam stability have been investigated to identify the minimum vacuum chamber radius and transverse damper properties required for stable beams.
 
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP17  
About • Received ※ 29 September 2023 — Revised ※ 06 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 01 November 2023
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TUA3I4 SARAF MEBT Commissioning 123
 
  • N. Pichoff, A. Chancé, J. Dumas, F. Gougnaud, F. Senée, D.U. Uriot
    CEA-IRFU, Gif-sur-Yvette, France
  • A. Kreisel, J. Luner, A. Perry, E. Reinfeld, R. Weiss-Babai, L. Weissman
    Soreq NRC, Yavne, Israel
 
  SNRC in Israel is in the process of constructing a neutron production accelerator facility called SARAF. The facility will utilize a linac to accelerate a 5 mA CW deuteron and proton beam up to 40 MeV. In the first phase of the project, SNRC completed construction and operation of a linac (referred to as SARAF Phase I) which included an ECR ion source, a Low-Energy Beam Transport (LEBT) line, and a 4-rod RFQ. The second phase of the project involves collaboration between SNRC and Irfu in France to manufacture the linac. The injector control system has been updated and the Medium Energy Beam Transport (MEBT) line has been installed and integrated into the infrastructure. Recent testing and commissioning of the injector and MEBT with 5 mA CW protons and 5 mA pulsed Deuterons, completed in 2022 and 2023, will be presented and discussed. A special attention will be paid to the experimental data processing with the Bayesian inference of the parameters of a digital twin.  
slides icon Slides TUA3I4 [2.559 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-TUA3I4  
About • Received ※ 04 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 29 October 2023
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