Keyword: experiment
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MOIPI1 1 MW J-PARC RCS Beam Operation and Further Beyond injection, operation, simulation, resonance 1
 
  • H. Hotchi
    KEK, Tokai, Ibaraki, Japan
  • H. Harada, N. Hayashi, M. Kinsho, K. Okabe, P.K. Saha, Y. Shobuda, F. Tamura, K. Yamamoto, M. Yamamoto, M. Yoshimoto
    JAEA/J-PARC, Tokai-mura, Japan
 
  The J-PARC RCS have recently established a 1 MW beam operation with low fractional beam loss of the order of 10-3. In this talk, our approaches to beam loss issues that we faced in the course of beam power ramp-up are reviewed. Our recent efforts to further beam power ramp-up beyond 1 MW are also presented.  
slides icon Slides MOIPI1 [2.210 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-MOIPI1  
About • Received ※ 04 October 2021 — Revised ※ 18 October 2021 — Accepted ※ 10 November 2021 — Issue date ※ 22 November 2021
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MOP08 Recent Progress on Nonlinear Beam Manipulations in Circular Accelerators resonance, emittance, controls, extraction 52
 
  • F. Capoani, M. Giovannozzi
    CERN, Geneva, Switzerland
  • A. Bazzani
    Bologna University, Bologna, Italy
 
  In recent years, transverse beam splitting by crossing a stable resonance has become the operational means to perform MultiTurn Extraction (MTE) from the CERN PS to the SPS. This method delivers the high-intensity proton beams for fixed-target physics at the SPS. More recently, further novel manipulations have been studied, with the goal of devising new techniques to manipulate transverse beam properties. AC magnetic elements can allow beam splitting to be performed in one of the transverse degrees of freedom. Crossing 2D nonlinear resonances can be used to control the sharing of the transverse emittances. Furthermore, cooling the transverse emittance of an annular beam can be achieved through an AC dipole. These techniques will be presented and discussed in detail, considering future lines of research.  
poster icon Poster MOP08 [5.281 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-MOP08  
About • Received ※ 04 October 2021 — Revised ※ 05 November 2021 — Accepted ※ 13 December 2021 — Issue date ※ 11 April 2022
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MOP21 3D Symplectic Space Charge Implementation in the Latest Mad-X Version simulation, emittance, space-charge, optics 129
 
  • F. Schmidt, A. Latina, H. Renshall
    CERN, Meyrin, Switzerland
  • Y.I. Alexahin
    Fermilab, Batavia, Illinois, USA
 
  In 2018 as part of a collaboration between CERN and FNAL, the space charge (SC) implementation has been upgraded in a test version of MAD-X. The goal has been to implement the 3D symplectic SC kick together with a number of new features and benchmark it with earlier MADX-SC versions. Emphasis has given to the use of the Sigma Matrix approach that allows to extend MAD-X optics calculations. In the meantime, significant effort has been made to fully debug and optimize the code and in particular to achieve a speed-up of the simulations by a factor of 2. The code has been ported to the latest MAD-X version, the elaborated set-up procedures have been automated and a user manual has been written.  
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poster icon Poster MOP21 [1.236 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-MOP21  
About • Received ※ 05 October 2021 — Revised ※ 21 October 2021 — Accepted ※ 11 November 2021 — Issue date ※ 12 April 2022
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MOP26 Status of Layout Studies for Fixed-Target Experiments in Alice Based on Crystal-Assisted Halo Splitting target, proton, collimation, detector 146
 
  • M. Patecki, D. Kikoła
    Warsaw University of Technology, Warsaw, Poland
  • A.S. Fomin, D. Mirarchi, S. Redaelli
    CERN, Geneva, Switzerland
 
  Funding: This project has received funding from the European Union’s Horizon 2020 research and innovation programme.
The Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN) is the world largest and most powerful particle accelerator colliding beams of protons and lead ions at energies up to 7 TeV and 2.76 TeV, respectively. ALICE is one of the detector experiments optimised for heavy-ion collisions. A fixed-target experiment in ALICE is considered to collide a portion of the beam halo split by means of a bent crystal with an internal target placed a few meters upstream of the detector. Fixed-target collisions offer many physics opportunities related to hadronic matter and the quark-gluon plasma to extend the research potential of the CERN accelerator complex. This paper summarises our progress in preparing the fixed-target layout consisting of crystal assemblies, a target and downstream absorbers. We discuss the conceptual integration of these elements within the LHC ring, impact on ring losses, conditions for a parasitic operation and expected performance in terms of particle flux on target.
 
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poster icon Poster MOP26 [0.453 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-MOP26  
About • Received ※ 30 September 2021 — Revised ※ 18 October 2021 — Accepted ※ 02 November 2021 — Issue date ※ 24 November 2021
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TUAC2 Impact of Power Supply Ripple on the Beam Performance of the Large Hadron Collider and the High-Luminosity LHC power-supply, dipole, betatron, operation 170
 
  • S. Kostoglou, H. Bartosik, Y. Papaphilippou, G. Sterbini
    CERN, Geneva, Switzerland
 
  Harmonics of the mains frequency (50 Hz) have been systematically observed in the form of dipolar excitations in the transverse beam spectrum of the Large Hadron Collider (LHC) since the beginning of its operation. The power supply ripple, consisting of both fundamental and higher frequency components, is proven not to be the result of an artifact of the instrumentation systems with which they are observed. Potential sources of the perturbation have been identified through systematic analysis and experimental studies. Single-particle tracking simulations have been performed including a realistic power supply ripple spectrum, as acquired from experimental observations, to demonstrate the impact of such noise effects on beam performance.  
slides icon Slides TUAC2 [3.678 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-TUAC2  
About • Received ※ 04 October 2021 — Revised ※ 20 October 2021 — Accepted ※ 23 November 2021 — Issue date ※ 25 February 2022
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THAC3 Exploring Quasi-Integrable Optics with the IBEX Paul Trap lattice, octupole, quadrupole, optics 214
 
  • J.A.D. Flowerdew
    University of Oxford, Oxford, United Kingdom
  • D.J. Kelliher, S. Machida, S.L. Sheehy
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
 
  An ideal accelerator built from linear components will exhibit bounded and stable particle motion. However, in reality, any imperfections in the magnetic field strength or slight misalignments of components can introduce chaotic and unstable particle motion. All accelerators are prone to these non-linearities but the effects are amplified when studying high intensity particle beams with the presence of space charge effects. This work aims to explore the non-linearities which arise in high intensity particle beams using a scaled experiment called IBEX. The IBEX experiment is a linear Paul trap which allows the transverse dynamics of a collection of trapped particles to be studied. It does this by mimicking the propagation through multiple quadrupole lattice periods whilst remaining stationary in the laboratory frame. IBEX is currently undergoing a nonlinear upgrade with the goal of investigating Quasi-Integrable Optics (QIO), a form of Nonlinear Integrable Optics (NIO), in order to improve our understanding and utilisation of high intensity particle beams.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-THAC3  
About • Received ※ 08 October 2021 — Revised ※ 16 October 2021 — Accepted ※ 22 November 2021 — Issue date ※ 23 December 2021
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THDC1 Slow Extraction Operation at J-PARC Main Ring extraction, operation, timing, septum 219
 
  • M. Tomizawa, Y. Arakaki, T. Kimura, S. Murasugi, R. Muto, H. Nishiguchi, K. Okamura, Y. Shirakabe, Y. Sugiyama, E. Yanaoka, M. Yoshii
    KEK, Ibaraki, Japan
  • K. Noguchi
    Kyushu University, Fukuoka, Japan
  • F. Tamura
    JAEA/J-PARC, Tokai-mura, Japan
 
  A high-intensity proton beam accelerated in the J-PARC main ring (MR) is slowly extracted by using the third integer resonance and delivered to the experimental hall. A critical issue in slow extraction (SX) is a beam loss caused during the extraction. A dynamic bump scheme under an achromatic condition provides extremely high extraction efficiency. We have encountered a beam instability in the debunch formation process, which is estimated to be triggered by a longitudinal microstructure of the beam. To suppress this instability, the beam to the MR has been injected into the RF bucket with a phase offset. A newly developed RF manipulation, 2-step voltage debunch, has successfully pushed up the beam power up to 64.6 kW keeping a high extraction efficiency of 99.5%. A drastic beam loss reduction has been demonstrated in the beam test using a diffuser installed upstream of the first electrostatic septum (ESS1). 8 GeV bunched slow extraction tests for the neutrino-less muon to electron conversion search experiment (COMET Phase-I) have been successfully conducted.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-THDC1  
About • Received ※ 18 October 2021 — Revised ※ 22 October 2021 — Accepted ※ 22 November 2021 — Issue date ※ 03 December 2021
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