Keyword: photon
Paper Title Other Keywords Page
TUP006 Simulation and Shot-by-Shot Monitoring of Linac Beam Halo electron, simulation, detector, radiation 191
  • A.S. Fisher, M. Bai, T. Frosio, A. Ratti, J. Smedley, J. Wu
    SLAC, Menlo Park, California, USA
  • I.S. Mostafanezhad, B. Rotter
    Nalu Scientific, LLC, Honolulu, USA
  FELs require a reproducible distribution of the bunch core at the undulator entrance for robust and reliable lasing. However, various mechanisms drive particles from the core to form a beam halo, which can scrape the beampipe of the undulator and damage its magnets. Collimators can trim the halo, but at the 1-MHz repetition rate of SLAC’s LCLS-II superconducting linac, the collimator jaws can be activated and damaged. The Machine Protection System (MPS) can detect excessive radiation and halt the beam, but repeated MPS trips lead to significant downtime. Halo control begins by studying its structure, formation, and evolution, using a sensitive halo monitor. To that end, we are developing a pixellated diamond sensor. Diamond offers a dynamic range of up to 7 orders of magnitude, extending from the edge of the core to the faint halo expected at greater distances. Nalu Scientific has developed fast electronics for high-rate shot-by-shot readout. Initial tests are starting with a prototype 16-pixel sensor at the beam dump of SLAC’s FACET-II test facility. The tests and simulations will guide more elaborate sensor designs.  
poster icon Poster TUP006 [2.602 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP006  
About • Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 19 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUP028 Collimator Irradiation Studies at the Advanced Photon Source experiment, simulation, storage-ring, radiation 245
  • J.C. Dooling, W. Berg, M. Borland, J.R. Calvey, L. Emery, A.M. Grannan, K.C. Harkay, Y. Lee, R.R. Lindberg, G. Navrotski, V. Sajaev, N. Sereno, J.B. Stevens, Y.P. Sun, K.P. Wootton
    ANL, Lemont, Illinois, USA
  • N.M. Cook
    RadiaSoft LLC, Boulder, Colorado, USA
  • D.W. Lee, S.M. Riedel
    UCSC, Santa Cruz, California, USA
  Funding: Work supported by the U.S. D.O.E.,Office of Science, Office of Basic Energy Sciences, under contract number DE-AC02- 06CH11357.
We present results from a recent collimator irradiation experiment conducted in the Advanced Photon Source (APS) storage ring. This experiment is the third in a series of studies to examine the effects of high-intensity electron beams on potential collimator material for the APS-Upgrade (APS-U). The intent here is to determine if a fan-out kicker can sufficiently reduce e-beam power density to protect horizontal collimators planned for the APS-U storage-ring. The fan-out kicker (FOK) spreads the bunched-beam vertically allowing it to grow in transverse dimensions prior to striking the collimator. In the present experiment, one of the two collimator test pieces is fabricated from oxygen-free copper; the other from 6061-T6 aluminum. As in past studies, diagnostics include turn-by-turn BPMs, a diagnostic image system, fast beam loss monitors, a pin-hole camera, and a current monitor. Post-irradiation analyses employ microscopy and metallurgy. To avoid confusion from multiple strikes, only three beam aborts are carried out on each of the collimator pieces; two with the FOK on and the other with it off. Observed hydrodynamic behavior will be compared with coupled codes.
poster icon Poster TUP028 [3.733 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP028  
About • Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 25 September 2023 — Issue date ※ 29 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUP042 Nano-Amp Beam Current Diagnostic for Linac-to-ESA (LESA) Beamline detector, electron, linac, radiation 285
  • S.T. Littleton
    Stanford University, Stanford, California, USA
  • A.S. Fisher, C. Huang, T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  The LESA beamline is designed to transport dark current from the LCLS-II and LCLS-II-HE superconducting linacs to the End Station A for various fixed target experiments. The primary experiment is expected to be the Light Dark Matter eXperiment (LDMX) which required beam currents of a few pA. The operation of the beam line much be parasitic to the LCLS-II / LCLS-II-HE FEL operation. The dark current in the LCLS-II is expected to be at the nA-level which will be below the resolution of most of the LCLS-II diagnostics (it will be degraded before the experiments as necessary). This paper will describe a possible non-destructive diagnostic using synchrotron radiation that could be applied at multiple locations along the LCLS-II and the LESA beamline.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP042  
About • Received ※ 07 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WE3I01 Gas Jet-Based Fluorescence Profile Monitor for Low Energy Electrons and High Energy Protons at LHC electron, experiment, distributed, injection 312
  • O. Sedláček, A.R. Churchman, A. Rossi, G. Schneider, C.C. Sequeiro, K. Sidorowski, R. Veness
    CERN, Meyrin, Switzerland
  • M. Ady, S. Mazzoni, M. Sameed
    European Organization for Nuclear Research (CERN), Geneva, Switzerland
  • P. Forck, S. Udrea
    GSI, Darmstadt, Germany
  • O. Sedláček, O. Stringer, C.P. Welsch, H.D. Zhang
    The University of Liverpool, Liverpool, United Kingdom
  • O. Sedláček, O. Stringer, C.P. Welsch, H.D. Zhang
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • A. Webber-Date
    Cockcroft Institute, University of Liverpool, Liverpool, United Kingdom
  The ever-developing accelerator capabilities of increasing beam intensity, e.g. for High Luminosity LHC (HL-LHC), demand novel non-invasive beam diagnostics. As a part of the HL-LHC project a Beam Gas Curtain monitor (BGC), a gas jet-based fluorescence transverse profile monitor, is being developed. The BGC uses a supersonic gas jet sheet that traverses the beam at 45° and visualizes a two-dimensional beam-induced fluorescent image. The principle of observing photons created by fluorescence makes the monitor insensitive to present electric or magnetic fields. Therefore, the monitor is well suited for high-intensity beams such as low-energy electron beam of Hollow Electron Lens (HEL), and HL-LHC proton beam, either as a profile or an overlap monitor. This talk will focus on the first gas jet measured transverse profile of the 7keV hollow electron beam. The measurements were carried out at the Electron Beam Test Stand at CERN testing up to 5A beam for HEL. A comparison with Optical Transition Radiation measurements shows consistency with the BGC results. The BGC installation of January 2023 at LHC is shown, including past results from distributed gas fluorescence tests.  
slides icon Slides WE3I01 [7.338 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WE3I01  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 27 September 2023 — Issue date ※ 02 October 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEP015 Synchrotron Light Monitor for the Advanced Photon Source Booster Synchrotron booster, synchrotron, electron, synchrotron-radiation 358
  • K.P. Wootton, W. Berg, W.P. Burns III, J.R. Calvey, J.C. Dooling, L. Erwin, A.H. Lumpkin, N. Sereno, S.E. Shoaf, S.G. Wang
    ANL, Lemont, Illinois, USA
  Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
A new synchrotron light monitor has been tested for the booster synchrotron of the Advanced Photon Source. Visible light synchrotron radiation is collected by a mirror on a path tangential to the electron beam orbit, and directed to an optical imaging system and camera. This is planned to be a non-intercepting, transverse beam-size monitor even with the higher stored beam charges (~17 nC) needed for the Advanced Photon Source Upgrade. In the present work, we describe the present synchrotron radiation diagnostic layout. An analysis of the synchrotron radiation power on the mirror, the optical layout with components, and features of the control system will be presented.
poster icon Poster WEP015 [1.148 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP015  
About • Received ※ 09 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 02 October 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEP016 Beamline for Time Domain Photon Diagnostics at the Advanced Photon Source Upgrade diagnostics, synchrotron, synchrotron-radiation, radiation 363
  • K.P. Wootton, W.X. Cheng, G. Decker, N. Sereno, F. Westferro
    ANL, Lemont, Illinois, USA
  Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Time domain photon diagnostics are proposed for electron beam characterisation and operation of the Advanced Photon Source Upgrade storage ring. In the present work, we present updated status on the time-domain X-ray and visible photon diagnostic beamline for the Advanced Photon Source Upgrade. We outline design influences leading to the proposed beamline layout, in particular long-term maintenance and commonality with other beamlines at the Advanced Photon Source.
poster icon Poster WEP016 [0.812 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP016  
About • Received ※ 10 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEP017 Electron Beam at the Advanced Photon Source Linac Extension Area Beamline electron, MMI, linac, beam-transport 368
  • K.P. Wootton, W. Berg, M. Borland, A.R. Brill, J.M. Byrd, S. Chitra, J.T. Collins, J.C. Dooling, J.N. Edwards, L. Erwin, G.I. Fystro, T. Grabinski, M.J. Henry, E.E. Heyeck, J.E. Hoyt, R.T. Keane, S.H. Lee, J. Lenner, I. Lobach, A.H. Lumpkin, A. Puttkammer, V. Sajaev, N. Sereno, Y. Sun, J. Wang, S.G. Wang, A. Zholents
    ANL, Lemont, Illinois, USA
  Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
The Linac Extension Area has been developed into a beamline area for testing accelerator components and techniques. Beginning commissioning activities in February 2023, we have delivered the first electron beam to the Linac Extension Area at the Advanced Photon Source at 425 MeV. In the present work, we outline the stages of re-commissioning the electron beamline. We summarise measurements of the electron beam transport through the accelerator. We outline scenarios used to verify the adequacy of radiation shielding of the beamline, and measured shielding performance.
poster icon Poster WEP017 [1.140 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP017  
About • Received ※ 10 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 30 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEP020 Performance Evaluation of GAGG+ and Tungsten Carbide Blades in an X-ray Pinhole Camera synchrotron, diagnostics, synchrotron-radiation, radiation 382
  • S.B. Burholt, L. Bobb, N. Vitoratou
    DLS, Harwell, United Kingdom
  At Diamond Light Source two X-ray pinhole cameras are used to measure the transverse profile of the 3 GeV electron beam. The current pinhole assembly is formed using tungsten blades with chemically etched shims to produce a 25 µm x 25 µm aperture and the imager incorporates a 0.2 mm LuAG:Ce scintillator. Tungsten carbide is a machinable high-Z material which at millimetre thicknesses is opaque to X-rays. With a slight change in pinhole design, similar to that already in place at the ESRF, tungsten carbide blades could offer a well-controlled aperture size for the pinhole camera with simpler assembly. Further to this, improvements to the photon yield of scintillators mean that the new scintillator GAGG+ has an almost two fold increase in yield compared to the current LuAG: Ce scintillator. An evaluation of the tungsten carbide blades and GAGG+ scintillator is presented.  
poster icon Poster WEP020 [0.468 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP020  
About • Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 24 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEP021 100Hz X-ray Beam Profile Measurements from a Transmissive CVD Diamond Detector detector, synchrotron, experiment, focusing 387
  • C. Bloomer, L. Bobb
    DLS, Oxfordshire, United Kingdom
  • M.E. Newton
    University of Warwick, Coventry, United Kingdom
  A non-destructive CVD diamond X-ray beam imaging monitor has been developed for synchrotron beamlines. The device can be permanently installed in the X-ray beam path and is capable of transmissively imaging the beam profile at 100 frames per second. The response of this transmissive detector at this imaging rate is compared to synchronously acquired images using a destructive fluorescent screen. It is shown that beam position, size, and intensity measurements can be obtained with minimal disturbance to the transmitted X-ray beam. This functionality is beneficial to synchrotron beamlines as it enables them to monitor the X-ray beam focal size and position in real-time, during user experiments. This is a key enabling technology that would enable live beam size feedback, keeping the beamline’s focusing optics optimised at all times. Ground vibrations (10-20Hz) can cause movement of focusing optics and beamline mirrors, which disturb the X-ray beam and reduce the ultimate quality of the sample-point beam. This instrument can detect this beam motion, enabling the source to be more easily determined and mitigations to be put in place.  
poster icon Poster WEP021 [1.842 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP021  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 02 October 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEP027 Status of Gas Sheet Monitor for Profile Measurements at FRIB simulation, optics, heavy-ion, vacuum 410
  • A. Lokey, S.M. Lidia
    FRIB, East Lansing, Michigan, USA
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University.
We report on the status of work on a non-invasive profile monitor under development for use at the Facility for Rare Isotope Beams (FRIB), a heavy-ion LINAC which produces high-intensity, multi-charge state beams. The measurement will be made by collecting photons generated at the interaction point of the beam and a collimated molecular gas curtain. These photons will be collected with an intensified camera system, generating a two dimensional image and allowing for measurements of profile, beam halo, and other properties more prevalent at specific locations of interest, such as charge state spread after folding segment bends. Included will be ongoing design specifications, simulation results, and discussion of measurement techniques for acquiring signal from the device.
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP027  
About • Received ※ 07 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 14 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)