Keyword: emittance
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MOP008 Consideration of Beam Instrumentation for SOLARIS Linac Upgrade linac, diagnostics, lattice, injection 45
  • A.I. Wawrzyniak, J.B. Biernat, R. Panaś, J.J. Wiechecki, M.T. Ünal
    NSRC SOLARIS, Kraków, Poland
  • A. Curcio
    LNF-INFN, Frascati, Italy
  SOLARIS linac currently operates at 540 MeV and is used as an injector to the storage ring, where after the accumulation the energy is ramped up to 1.5 GeV via two active RF cavities. Top-up injection would be of extreme benefits for user operation, therefore a new 1.5 GeV linac is being designed. The idea is to replace the current machine without infrastructural interventions in terms of tunnel expansion. Performed studies demonstrate that the best solution is provided by a Hybrid S-band/C-band LINAC. One of the main goals is to achieve bunch compression below the picosecond level and low-emittance beams for a future short-pulse facility or a Free Electron Laser. Within this presentation the results of performed simulations will be presented together with the concept of different diagnostics as BPMs, current transformers, YAG screens, coherent diffraction radiation monitor distribution.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP008  
About • Received ※ 08 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
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MOP045 Robust Emittance Measurements focusing, solenoid, quadrupole, experiment 127
  • I. Pinayev
    BNL, Upton, New York, USA
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy
The quadrupole scan is commonly used for measurement of beam emittance. The found dependence of the beam size vs. quadrupole strength is fitted with parabola, which coefficients are used for emittance calculations. The measurement errors can cause substantial variations in the emittance value. Sometimes the fitted parabola has negative minimum value, making impossible emittance calculation. We propose more robust data processing using weighted fit for parabola or modifying the quadrupole scan procedure. The experimental results are presented.
poster icon Poster MOP045 [0.255 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP045  
About • Received ※ 25 August 2023 — Revised ※ 11 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 28 September 2023
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MOP046 Measurement of Slice Emittance with Deflecting Cavity and Slit cavity, quadrupole, experiment, electron 129
  • I. Pinayev
    BNL, Upton, New York, USA
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy
Coherent Electron Cooling experiment carried out at RHIC requires small slice emittance of 15 MeV electron beam with high peak current. In this paper we describe the system for slice emittance measurement utilizing transverse deflecting cavity and slit. The image of the beam passing through the slit is used to measure slice intensity and angular divergence. Beam size at slit location is measured using scan of the beam across the slit with trim. The angular kick by the trim is taken into the account during calculations. Data processing and the experimental results are presented.
poster icon Poster MOP046 [0.997 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP046  
About • Received ※ 28 August 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 19 September 2023
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TU3C03 Collimator Scan Based Beam Halo Measurements in LHC and HL-LHC betatron, luminosity, 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
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TUP023 Application of a Camera Array for the Upgrade of the AWAKE Spectrometer electron, target, proton, plasma 230
  • E. Senes, S. Mazzoni, M. Turner, G. Zevi Della Porta
    CERN, Meyrin, Switzerland
  • D.A. Cooke, F.E. Pannell, M. Wing
    UCL, London, United Kingdom
  The first run of the AWAKE experiment successfully demonstrated the acceleration of an electron beam in the plasma wakefields of a relativistic proton beam. The planned second run will focus on the control of the emittance  of accelerated electrons, requiring an upgrade of the  existing spectrometer. Preliminary measurements showed that this might be achieved by improving the resolution of the scintillator and with a new design of the optical system. This contribution discusses the application of a digital camera array in close proximity of the spectrometer scintillator, to enable the accelerated electron beam emittance measurement.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP023  
About • Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 24 September 2023
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WE3C02 Development of a Precise 4d Emittance Meter Using Differential Slit Image Processing simulation, experiment, electron, background 318
  • B.K. Shin, G. Hahn
    PAL, Pohang, Republic of Korea
  • M. Chung, C.K. Sung
    UNIST, Ulsan, Republic of Korea
  We have developed a highly precise 4D emittance meter for X-Y coupled beams with 4D phase-space (x-x’, y-y’, x-y’, y-x’) which utilizes an L-shaped slit and employs novel analysis techniques. Our approach involves two types of slit-screen image processing to generate pepper-pot-like images with great accuracy. One which we call the "differential slit" method, was developed by our group. This approach involves combining two slit-screen images, one at position x and the other at position x + the size of the slit, to create a differential slit image. The other method we use is the "virtual pepper-pot (VPP)" method, which combines x-slit and y-slit images to produce a hole (x,y) image. By combining that hole images, we are able to take extra x-y’ and y-x’ phase-space. The "differential slit" method is crucial for accurately measuring emittance. Through simulations with 0.1 mm slit width using Geant4, the emittance uncertainties for a 5 nm rad and 0.2 mm size electron beam were 5% and 250% with and without the "differential slit", respectively. In this presentation, we provide a description of the methodology, the design of slit, and the results of the 4D emittance measurements.  
slides icon Slides WE3C02 [4.459 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WE3C02  
About • Received ※ 30 August 2023 — Revised ※ 13 September 2023 — Accepted ※ 26 September 2023 — Issue date ※ 28 September 2023
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WEP002 Study of Visible Synchrotron Radiation Monitor on SOLEIL Booster booster, extraction, synchrotron, synchrotron-radiation 331
  • A. Moutardier, G. Cauchon, M. Chevrot, Z. Fan, N. Hubert, S. Kubsky, M. Labat, M. Thomasset
    SOLEIL, Gif-sur-Yvette, France
  In the scope of SOLEIL II, the booster must also be upgraded to reduce from 130 to 5~nm.rad the emittance of the beam delivered to the ring. Control of the emittance in the booster will become crucial to ensure the nominal performance of the storage ring injection. The SOLEIL I booster is already equipped with a Visible Synchrotron Radiation Monitor (MRSV). This equipment, made of an extraction mirror and a simple optical system, was originally planned to be used only for beam presence verification but has not been used routinely for operation since the commissioning in 2005. The control and acquisition systems had to be refreshed to be usable again and allow the beam size measurement along the booster energy ramp. The extraction mirror was replaced due to unexpected degradation leading to a second spot appearing on the camera. This paper traces back the MRSV upgrades from understanding the cause of mirror degradation until mirror replacement and the first proper beam visualisation, achieved at the beginning of 2023.  
poster icon Poster WEP002 [1.550 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP002  
About • Received ※ 04 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 16 September 2023
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WEP006 Development of Pepper-pot Emittance Monitor for High-intensity Ion Beam Accelerated by RIKEN AVF Cyclotron cyclotron, target, radiation, beam-transport 339
  • Y. Kotaka, N. Imai, K. Kamakura, Y. Sakemi, H. Yamaguchi
    CNS, Saitama, Japan
  • K. Hatanaka
    RCNP, Osaka, Japan
  • J. Ohnishi
    RIKEN Nishina Center, Wako, Japan
  At the Center for Nuclear Study of the University of Tokyo, the measurement of Electric Dipole Moment of Francium (Fr) is underway with the world highest precision. Fr is generated by nuclear fusion reaction by irradiating gold with oxygen ion beam accelerated by RIKEN AVF Cyclotron. The required beam intensity is 18 eµA or more. However, the average beam transport efficiency drops to be around 66 % as the beam intensity exceeds 10 eµA. To solve the problem, a pepper-pot emittance monitor (PEM) for high-intensity beams has been developed. Referencing the PEM used for the injection beams of AVF Cyclotron, we have developed three additional items. The first is reducing the radiation damage to a camera, which is placed away from the beamline. The distance between the camera and PEM is 2.2 m, and the average image position accuracy of 0.15 mm is achieved. The second is the angular accuracy suitable for the accelerated beam. The required angular accuracy is estimated to be less than 0.3 mrad. A beam test for the first and second items is planned. The third is a beam shutter system to prevent PEM from heating due to beam. The measurement time by the system reaches 0.27 seconds now.  
poster icon Poster WEP006 [2.250 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP006  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 29 September 2023
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WEP028 LANSCE High Density Emittance Instrumentation System instrumentation, controls, hardware, data-acquisition 413
  • L.S. Montoya, S.A. Baily, S.M. Johnson, H.L. Leffler, H.A. Watkins, D.D. Zimmermann
    LANL, Los Alamos, New Mexico, USA
  Funding: Work supported by the U.S. Department of Energy, contract no. 89233218CNA000001. LA-UR-23-25123
The Los Alamos Neutron Science Center (LANSCE) is currently upgrading the existing emittance stations with a high-density instrumentation system for emittance measurements in the low energy beam transport region. Emittance measurements were obtained using obsolete legacy equipment. For motion control a switching station with a mechanical mux to switch actuators was used. This caused a single point of failure for all emittance stations and is becoming increasingly unreliable. For data acquisition, two sets of signal conditioning and digitizers were employed and had to be shared between 7 emittance stations. Physical cable swapping was necessary when taking measurements from station to station. A system was developed using dedicated Quad Actuator Controller (QAC) chassis, capable of driving four (4) actuators, and dedicated data acquisition (DAQ) chassis capable of signal conditioning and digitizing up to 80 channels simultaneously. Details of the system development are presented.
poster icon Poster WEP028 [0.400 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP028  
About • Received ※ 07 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 25 September 2023 — Issue date ※ 01 October 2023
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