Keyword: laser
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MOP026 A Novel BPM Mechanical Center Calibration Method Based on Laser Ranging experiment, software, operation, electronics 82
  • X.H. Tang, J.S. Cao, Y.Y. Du, J. He, Y.F. Sui, J.H. Yue
    IHEP, Beijing, People’s Republic of China
  Determining the mechanical center of the beam position monitor(BPM) has been a difficulty for BPM calibration. To solve this problem, a method of positioning the BPM mechanical center based on laser ranging is proposed. This method uses high-precision antenna support as the core locating datum, and high-precision laser ranging sensors(LRSs) as the detection tool. By detecting the distances from the LRSs to the antenna support and the distances from the LRSs to the BPM, the mechanical center of the BPM can be indirectly determined. The theoretical system error of this method is within 20¿m, and the experimental results show that the measurement repeatability is less than 40¿m, This method has low cost and fast speed, which can be used for large-scale calibration.  
poster icon Poster MOP026 [1.142 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP026  
About • Received ※ 13 July 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023
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MOP031 A Study Into the Long-Term Stability of Front End X-Ray Beam Position Monitor Support Columns at Diamond Light Source experiment, resonance, ground-motion, damping 90
  • C.E. Houghton, C. Bloomer, L. Bobb, D. Crivelli, J.E. Melton, H. Patel
    DLS, Harwell, United Kingdom
  Sand-filled steel columns are used at Diamond Light Source to support front end X-ray beam position monitors. This approach is chosen due to the relatively large thermal mass of the sand being considered useful to reduce the rate at which expansion and contraction of the column occurred as the storage ring tunnel temperature varied, particularly during machine start-up. With the higher requirements for mechanical stability for the upcoming Diamond-II upgrade, there is now a need to assess and quantify the current system’s impact on X-ray beam movement. A study of thermal and mechanical stability has been carried out to quantify the stability performance of the front end X-ray beam position monitor’s columns and the impact that column motion may have on the X-ray beam position measurement. Measurements have been made over a range of different timescales, from 250 Hz up to 2 weeks. The measured stability of the support column is presented, showing that it meets our Diamond-II stability requirements. A comparison of the stability of the column with and without a sand filling is presented.  
poster icon Poster MOP031 [0.594 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP031  
About • Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 17 September 2023
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TU2C03 Sub-20 fs Synchronization Between Mode-Locked Laser and Radio Frequency Signal timing, FEM, detector, electron 151
  • J.G. Wang, B. Liu, W. Wu
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  The femtosecond synchronization and distribution system of the Shanghai soft X-ray free-electron laser facility (SXFEL) and Shanghai high repetition rate XFEL and extreme light facility (SHINE) are based on the optical pulse trains generated by passively mode-locked lasers. The passively mode-locked laser has ultralow noise in the high offset frequency (<5 fs, [1 kHz- 1 MHz]). In this paper, we report precise synchronization of the low-noise passively mode-locked laser to the radio frequency (RF) master oscillator. RF-based phase-locked loop scheme, the absolute jitter of the phase-locked passively mode-locked laser is less than 20 fs integrated from 10 Hz up to 1 MHz.  
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DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU2C03  
About • Received ※ 29 August 2023 — Revised ※ 09 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 02 October 2023
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TUP007 Use of the ISAC-II Flight Time Monitors toward Automated Tuning ISAC, linac, cavity, diagnostics 195
  • S. Kiy, P.M. Jung, T. Planche, O. Shelbaya, V.V. Verzilov
    TRIUMF, Vancouver, Canada
  A time-of-flight measurement system has been in use at ISAC-II since 2006 for the phasing of cavities and accurate ion beam velocity measurements across the nuclear chart. This system is heavily relied upon as the primary energy-time domain diagnostic downstream of the ISAC-II linac. Ongoing High Level Applications (HLA) development at TRIUMF has enabled the use of methods that are being applied to these measurements - both for processing and automation of data acquisition. An update will be provided on operational experience with the system over the past 10 years including its recent re-calibration and error analysis. A brief summary of the current HLA framework will be given, including a database for beam measurements and the ability to carry out sequential measurement processes. Finally, the way in which these developments enable beam-based calibration of cavity parameters and a shift to model-based tuning methods is discussed.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP007  
About • Received ※ 29 August 2023 — Revised ※ 12 September 2023 — Accepted ※ 15 September 2023 — Issue date ※ 30 September 2023
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TUP012 First Measurements of an Electro-Optical Bunch Arrival-Time Monitor Prototype with PCB-Based Pickups for ELBE pick-up, electron, free-electron-laser, FEL 214
  • B.E.J. Scheible, A. Penirschke
    THM, Friedberg, Germany
  • W. Ackermann, H. De Gersem
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M.K. Czwalinna, T.A. Nazer, H. Schlarb, S. Vilcins
    DESY, Hamburg, Germany
  • M. Freitag, M. Kuntzsch
    HZDR, Dresden, Germany
  Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) under Contract No. 05K19RO1 and 05K22RO2.
A vacuum sealed prototype of an electro-optical bunch-arrival-time monitor has been commissioned in 2023. It comprises of a pickup-structure and a low-pi-voltage ultra-wideband traveling wave electro-optical modulator. The stainless-steel body of the pickup structure is partially produced by additive manufacturing and comprises four pickups as well as an integrated combination network on a printed circuit board. This novel design aims to enable single-shot bunch-arrival-time measurements for electron beams in free-electron lasers with single-digit fs precision for low bunch charges down to 1 pC. The theoretical jitter charge product has been estimated by simulation and modeling to be in the order of 9 fs pC. The new prototype is tailored for validation experiments at the ELBE accelerator beamline. In this contribution first measurement results are presented.
poster icon Poster TUP012 [2.469 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP012  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 17 September 2023
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TUP021 Development of the RF Phase Shifter with Femtosecond Time Delay Resolution for the PAL-XFEL Laser System controls, FEL, experiment, detector 222
  • D.C. Shin, H.-S. Kang, G. Kim, C.-K. Min, G. Mun
    PAL, Pohang, Republic of Korea
  We introduce the RF Phase Shifter (RPS) developed in the Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL) to control the timing of optical laser system. This equipment is designed to finely adjust the timing of laser pulses with femtosecond scale by manipulating the phase of the RF reference using a couple of Direct Digital Synthesizer (DDS) devices. Furthermore, it is designed with low phase noise and low phase drift features in order to minimize the impact on the system in an open-loop operation. Currently these units are installed at the Injection site, Hard X-ray and Soft X-ray Beamline. They are implemented for the feedback control of the photocathode gun phase at the Injector and for the use in pump-probe experiments at the Beamlines. This paper describes the design, fabrication, and experimental results of the RPS, as well as its usage status at PAL-XFEL.  
poster icon Poster TUP021 [1.194 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP021  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 22 September 2023
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TUP022 Characterisation of Cherenkov Diffraction Radiation Using Electro-Optical Methods electron, radiation, simulation, experiment 226
  • A. Schlögelhofer, T. Lefèvre, S. Mazzoni, E. Senes
    CERN, Meyrin, Switzerland
  • L. Duvillaret
    KAPTEOS, Sainte-Helene-du-Lac, France
  • A. Schlögelhofer
    TU Vienna, Wien, Austria
  The properties of Cherenkov diffraction radiation (ChDR) have been studied extensively during the recent years to be exploited for non-invasive beam diagnostic devices for short bunches. The dependence of charge and the influence of the bunch form factor on the coherent part of the radiated spectrum have been demonstrated and studied in the past. However, the actual field strength of coherent ChDR as well as its study in time domain need further investigation. In this contribution we are using electro-optical techniques to investigate and quantify these parameters. The electro-optical read-out brings the advantage of high bandwidth acquisition and insensitivity to electromagnetic interference, whereas at the same time a large fraction of the acquisition setup can be installed and operated outside of the radiation controlled areas. We will present experimental results from the CLEAR facility at CERN as well as simulations of the peak field of the temporal profile of beam-generated ChDR pulses.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP022  
About • Received ※ 05 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 13 September 2023
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WEP024 A Simulation of the Photoionization of H Together With the Subsequent Tracking of the Liberated Electrons electron, simulation, linac, MEBT 400
  • R.M. Thurman-Keup, M. El Baz, V.E. Scarpine
    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.
The Proton Improvement Plan - II (PIP-II) is a new linear accelerator (LINAC) complex being built at Fermilab. It is based on superconducting radiofrequency cavities and will accelerate H ions to 800 MeV kinetic energy before injection into the existing Booster ring. Measurements of the profile of the beam along the LINAC must be done by non-intercepting methods due to the superconducting cavities. The method chosen is photoionization of a small number of H by a focused infrared laser, aka laserwire. The number of ionized electrons is measured as a function of laser position within the H beam. To aid in the design of the collection mechanism, a simulation was written in MATLAB with input from the commercial electromagnetic simulation, CST. This simulation calculates the number and positions of the liberated electrons and tracks them through the magnetic collection and H beam fields to the collection point. Results from this simulation for various points along the LINAC will be shown.
poster icon Poster WEP024 [7.451 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP024  
About • Received ※ 08 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 30 September 2023
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