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

Journal Article · Wed Apr 08 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4916433· OSTI ID:22391414

Fink, D. A.; Lettry, J.; Scrivens, R.; Steyaert, D. ^[1]; Midttun, Ø. ^[2]; CERN, 1211 Geneva 23 ^[3]; Valerio-Lizarraga, C. A. ^[4]; CERN, 1211 Geneva 23 ^[3]

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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)

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 demonstrated 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.

• OSTI ID: 22391414
• Journal Information: AIP Conference Proceedings, Vol. 1655, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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