Unwanted Beam Workshop (UBW2012)

from to (Europe/Berlin)
at Humboldt-University Berlin, Erwin-Schrödinger-Zentrum ( 0'119 )
Rudower Chaussee 26 12489 Berlin
Description
The Helmholtz Initiative for Accelerator Research & Development (ARD) was established to strengthen development in accelerator physics and technology and to ensure international competitiveness. In this framework, accelerator scientists push the limits of today’s technology in a research network of six Helmholtz centers (Deutsches Elektronen-Synchrotron (DESY) in Hamburg and Zeuthen, Helmholtz Zentrum Dresden-Rossendorf (HZDR), Forschungszentrum Jülich (FZJ), Helmholtz Zentrum for Heavy Ion Research GSI in Darmstadt, Karlsruhe Institute for Technology (KIT), and Helmholtz Zentrum Berlin for Materials and Energy (HZB), two Helmholtz institutes, eleven universities, two Max-Planck institutes, and the Max-Born institute.
 
The topical ARD Unwanted Beam Workshop was focused on the physics and technology associated with unwanted beam generation in modern particle accelerators. Unwanted beam, particles generated and accelerated with wrong properties in space and time, can be the cause for beam loss and therefore increased level of radiation and cause acute and chronic damage of the accelerator components. During the two-day workshop we discussed models, measurements and mitigation strategies for unwanted beam. We concentrated the attention to aspects related to RF and DC photoinjectors and SRF accelerators.
The workshop was organized in sessions related to:
  1. Requirements from ERL/FEL/linac operation on unwanted beam
  2. Unwanted beam dynamics simulation
  3. Handling of photocathodes and substrates. Field emission measurements (DC setups, RF guns)
  4. Solutions for mitigation of dark current and unwanted beam
  5. Roadmap discussion and scope for collaborations and experiments.
The workshop was organized by ARD, HZDR, HU Berlin and HZB. The workshop brought together scientists from universities and Helmholtz centers that are involved in the subtopic 1 (ST1) “Superconducting RF technology and high brightness CW beam sources” of the ARD program. It strengthens collaborative projects at and between the different accelerator facilities. The workshop also served to educate young researchers and students participating in projects and experiments within ST1.
Go to day
  • Monday, 17 December 2012
    • 09:30 - 10:00 Welcome Coffee
    • 10:00 - 10:30 Welcome to Workshop and Organisational Issues
      • 10:00 Welcome (P. Michel) 15'
        Material: Slides powerpoint file}
    • 10:30 - 12:30 Session1 - Introduction to Workshop Themes (A. Matveenko)
      • 10:30 Introduction and BERLinPro context (A. Matveenko) 30'
        Speaker: Prof. Aleksandr Matveenko (Humboldt Universität zu Berlin)
        Material: Slides powerpoint file}
      • 11:00 Jefferson Lab experience with beam halo, beam loss (P. Evtushenko) 40'
        Speaker: Dr. Pavel Evtushenko (Jefferson Lab)
        Material: Slides powerpoint file}
      • 11:40 Dark current/ Halo at Budker (Y. Getmanov) 30'
        Material: Slides powerpoint file}
    • 12:30 - 13:40 Lunch
    • 13:40 - 15:00 Session2 - Modelling (M. Abo-Bakr)
      • 14:00 Beam halo modelling in the BERLinPro injector (A. Matveenko) 15'
        Speaker: Prof. Aleksandr Matveenko (Humboldt Universität zu Berlin)
        Material: Slides powerpoint file}
      • 14:15 Numerical simulation of dark current and halo particles (V. Volkov) 20'
        Speaker: Dr. Vladimir Volkov (Budker Institute of Nuclear Physics)
        Material: Slides powerpoint file}
      • 14:35 Multipacting simulation for the PITZ RF Photo gun (I. Isaev) 15'
        Speaker: Mr. Igor Isaev (DESY Zeuthen)
        Material: Slides powerpoint file}
    • 15:00 - 15:30 Coffee Break
    • 15:30 - 17:00 Session 3-Strategies (J. Teichert)
      • 15:30 Results from Commissioning of the Cornell ERL Injector (B. Dunham) 30'
        Material: Slides powerpoint file}
      • 16:00 High dynamic range beam diagnostics (P. Evtushenko) 30'
        Material: Slides powerpoint file}
      • 16:30 Dark current monitor for XFEL and its test at PITZ and FLASH (D. Lipka) 30'
        Speaker: Dr. Dirk Lipka (DESY)
        Material: Slides powerpoint file}
    • 17:00 - 17:15 Break
    • 17:15 - 18:45 Session 3-Strategies (J. Teichert)
      • 17:15 Beam loss issues for high power, high brightness electron injectors (B. Dunham) 30'
        Material: Slides powerpoint file}
      • 17:45 Dark current kicker development for ELBE (G. Staats) 30'
        Material: Slides powerpoint file}
      • 18:15 Halo monitor for XFEL (A. Ignatenko) 30'
        Material: Slides powerpoint file}
    • 20:00 - 22:00 Workshop Dinner ( Boccacelli )
  • Tuesday, 18 December 2012
    • 09:00 - 09:30 Welcome Coffee
    • 09:30 - 10:45 Session 4(1) Substrate Handling and FE Measurements (R. Barday)
      • 09:30 Dark current measurements at ELBE (R. Xiang) 30'
        Material: Slides powerpoint file}
      • 10:00 Photo injector dark current at FLASH and efforts for mitigation of dark current at FLASH and XFEL (S. Lederer) 30'
        Material: Slides powerpoint file}
      • 10:30 Dark current measurements at PITZ (I. Isaev) 15'
        Speaker: Mr. Igor Isaev (DESY Zeuthen)
        Material: Slides powerpoint file}
    • 10:45 - 11:15 Coffee Break
    • 11:15 - 12:00 Session 4(2) Substrate Handling and FE Measurements (R. Barday)
      • 11:15 Field emission in (S)RF cavities (D. Reschke/S. Lederer) 15'
        Material: Slides powerpoint file}
      • 11:30 Surface roughness and field emission measurements on diamond turned Cu samples (S. Lagotzky) 30'
        Speaker: Mr. Stefan Lagotzky (University of Wuppertal)
        Material: Slides powerpoint file}
    • 12:00 - 13:00 Lunch
    • 13:00 - 14:00 Session 4(3) Substrate Handling and FE Measurements (R. Barday)
      • 13:00 Activation and conditioning of FE on flat Nb surface (S. Lagotzky) 30'
        Speaker: Mr. Stefan Lagotzky (University of Wuppertal)
        Material: Slides powerpoint file}
      • 13:30 Plans for field emission studies at HZB for BERLinPro (R. Barday) 30'
        Speaker: Roman Barday (Helmholtz-Zentrum Berlin)
        Material: Slides powerpoint file}
    • 14:00 - 14:30 Session 5 Round Table Discussion
    • 14:30 - 15:00 Closing Summary: Concluding remarks