Keyword: ECR
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MOP036 A New Approach for Canadian Light Source Future Orbit Correction System Driven by Neural Network network, storage-ring, experiment, real-time 102
  • S. Saadat, M.J. Boland
    CLS, Saskatoon, Saskatchewan, Canada
  • M.J. Boland
    University of Saskatchewan, Saskatoon, Canada
  The Orbit Correction System (OCS) of the CLS comprises 48 sets of BPMs. Each BPM has the ability to measure the position of the beam in both the X-Y directions and can record data at a rate of 900 times per second. The Inverse Response Matrix is utilized to determine the optimal strength of the 48 sets of orbit correctors in both the X-Y directions, in order to ensure that the beam follows its desired path. The Singular Value Decomposition function is replaced by a neural network algorithm to serve as the brain of the orbit correction system in this study. The training model’s design includes three hidden layers, and within each layer, there are 96 nodes. The neural network’s outputs for regular operations in CLS exhibit a Mean Square Error of 10-7. Various difficult scenarios were created to test the OCS at 8.0 mA, using offsets in different sections of the storage ring. However, the new model was able to produce the necessary Orbit Correctors signals without any trouble.  
poster icon Poster MOP036 [1.438 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP036  
About • Received ※ 14 July 2023 — Revised ※ 09 September 2023 — Accepted ※ 28 September 2023 — Issue date ※ 30 September 2023
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WE3C03 Radiation Hard Beam Profile Monitors for the North Experimental Beamlines CERN radiation, detector, operation, experiment 321
  • E. Buchanan
    European Organization for Nuclear Research (CERN), Geneva, Switzerland
  • J. Cenede, S. Deschamps, W. Devauchelle, A. Frassier, J.N.G. Kearney, R.G. Larsen, I. Ortega Ruiz
    CERN, Meyrin, Switzerland
  A new radiation hard profile monitor is being researched and developed for the North Area Beamlines at CERN. The monitor must have a spatial resolution of 1 mm or less, an active area of 20 x 20 cm, a low material budget (~0.3%) and be operational in a beam that has a maximum rate of ~2x1011 p/s in the full energy range of 0.5 ¿ 450 GeV/c. The current focus is the study of different detection mediums: silica optical fibres (Cherenkov radiation), glass capillaries filled with liquid scintillator, and hollow core optical fibres filled with scintillation gasses. Prototypes of the different fibre candidates have been tested with an Ultra-High Dose Rate electron beam, a low intensity hadron beam and will be tested with a high intensity hadron beam during summer 2023. The key properties to compare between the different fibres are the light yield and radiation tolerance. In parallel, the performance of the fibres is being tested for their compatibility of use for FLASH medical therapy applications.  
slides icon Slides WE3C03 [4.294 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WE3C03  
About • Received ※ 29 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 18 September 2023
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WEP025 A Study of the Gain of Microchannel Plates in the Ionization Profile Monitors at Fermilab electron, booster, instrumentation, vacuum 405
  • R.M. Thurman-Keup, C.E. Lundberg, D. Slimmer, J.R. Zagel
    Fermilab, Batavia, Illinois, USA
  Funding: This work was produced by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
One of the on-going issues with the use of microchannel plates (MCP) in the ionization profile monitors (IPM) at Fermilab is the significant decrease in gain over time. There are several possible issues that can cause this. Historically, the assumption has been that this is aging, where the secondary emission yield (SEY) of the pore surface changes after some amount of extracted charge. Recent literature searches have brought to light the possibility that this is an initial ’scrubbing’ effect whereby adsorbed gasses are removed from the MCP pores by the removal of charge from the MCP. This paper discusses the results of studies conducted on the IPMs in the Main Injector at Fermilab.
poster icon Poster WEP025 [7.408 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP025  
About • Received ※ 08 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 18 September 2023
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