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Title: Optimization of the beam extraction systems for the Linac4 H{sup −} ion source

The development of the Linac 4 and its integration into CERN’s acceleration complex is part of the foreseen luminosity upgrade of the Large Hadron Collider (LHC). The goal is to inject a 160 MeV H{sup −} beam into the CERN PS Booster (PSB) in order to increase the beam brightness by a factor of 2 compared to the 50 MeV proton linac, Linac 2, that is currently in operation. The requirements for the ion source are a 45 keV H{sup −} beam of 80 mA intensity, 2 Hz repetition rate and 0.5 ms pulse length within a normalized rms-emittance of 0.25 mm· mrad. The previously installed beam extraction system has been designed for an H{sup −} ion beam intensity of 20 mA produced by an RF-volume source with an electron to H{sup −} ratio of up to 50. For the required intensity upgrades of the Linac4 ion source, a new beam extraction system is being produced and tested; it is optimized for a cesiated surface RF-source with a nominal beam current of 40 mA and an electron to H{sup −} ratio of 4. The simulations, based on the IBSIMU code, are presented. At the Brookhaven National Laboratory (BNL), a peak beam current of more than 100 mA was demonstratedmore » with a magnetron H{sup −} source at an energy of 35 keV and a repetition rate of 2 Hz. A new extraction system is required to operate at an energy of 45 keV; simulation of a two stage extraction system dedicated to the magnetron is presented.« less
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [3]
  1. CERN, 1211 Geneva 23 (Switzerland)
  2. University of Oslo, P.O. Box 1048, 0316 Oslo (Norway)
  3. (Switzerland)
  4. Departamento de Investigación en Fisica, Universidad de Sonora, Hermosillo (Mexico)
Publication Date:
OSTI Identifier:
22391414
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1655; Journal Issue: 1; Conference: NIBS 2014: 4. International Symposium on Negative Ions, Beams and Sources, Garching (Germany), 6-10 Oct 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAM CURRENTS; BEAM EXTRACTION; BEAM LUMINOSITY; BEAM PRODUCTION; BNL; BRIGHTNESS; CERN; CERN LHC; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; ELECTRONS; I CODES; ION BEAMS; ION SOURCES; LINEAR ACCELERATORS; MAGNETRONS; MEV RANGE; OPTIMIZATION; PROTONS