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Title: Operation Status of the J-PARC Negative Hydrogen Ion Source

Abstract

A cesium-free negative hydrogen ion source driven with a lanthanum hexaboride (LaB{sub 6}) filament is being operated without any serious trouble for approximately four years in J-PARC. Although the ion source is capable of producing an H{sup -} ion current of more than 30 mA, the current is routinely restricted to approximately 16 mA at present for the stable operation of the RFQ linac which has serious discharge problem from September 2008. The beam run is performed during 1 month cycle, which consisted of a 4-5 weeks beam operation and a few days down-period interval. At the recent beam run, approximately 700 h continuous operation was achieved. At every runs, the beam interruption time due to the ion source failure is a few hours, which correspond to the ion source availability of more than 99%. The R and D work is being performed in parallel with the operation in order to enhance the further beam current. As a result, the H{sup -} ion current of 61 mA with normalized rms emittance of 0.26 {pi}mm.mrad was obtained by adding a cesium seeding system to a J-PARC test ion source which has the almost same structure with the present J-PARC ion source.

Authors:
; ; ; ;  [1]
  1. J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195 (Japan)
Publication Date:
OSTI Identifier:
21611668
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1390; Journal Issue: 1; Conference: 2. international symposium on negative ions, beams and sources, Takayama City (Japan), 16-19 Nov 2010; Other Information: DOI: 10.1063/1.3637393; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM CURRENTS; BEAM EMITTANCE; FAILURES; FILAMENTS; HYDROGEN IONS 1 MINUS; ION SOURCES; J-PARC; LANTHANUM BORIDES; LINEAR ACCELERATORS; NEUTRON BEAMS; OPERATION; PLASMA; PLASMA PRODUCTION; ACCELERATORS; ANIONS; BEAMS; BORIDES; BORON COMPOUNDS; CHARGED PARTICLES; CURRENTS; CYCLIC ACCELERATORS; HYDROGEN IONS; IONS; LANTHANUM COMPOUNDS; NUCLEON BEAMS; PARTICLE BEAMS; RARE EARTH COMPOUNDS; SYNCHROTRONS

Citation Formats

Oguri, H., Ikegami, K., Ohkoshi, K., Namekawa, Y., and Ueno, A. Operation Status of the J-PARC Negative Hydrogen Ion Source. United States: N. p., 2011. Web. doi:10.1063/1.3637393.
Oguri, H., Ikegami, K., Ohkoshi, K., Namekawa, Y., & Ueno, A. Operation Status of the J-PARC Negative Hydrogen Ion Source. United States. doi:10.1063/1.3637393.
Oguri, H., Ikegami, K., Ohkoshi, K., Namekawa, Y., and Ueno, A. Mon . "Operation Status of the J-PARC Negative Hydrogen Ion Source". United States. doi:10.1063/1.3637393.
@article{osti_21611668,
title = {Operation Status of the J-PARC Negative Hydrogen Ion Source},
author = {Oguri, H. and Ikegami, K. and Ohkoshi, K. and Namekawa, Y. and Ueno, A.},
abstractNote = {A cesium-free negative hydrogen ion source driven with a lanthanum hexaboride (LaB{sub 6}) filament is being operated without any serious trouble for approximately four years in J-PARC. Although the ion source is capable of producing an H{sup -} ion current of more than 30 mA, the current is routinely restricted to approximately 16 mA at present for the stable operation of the RFQ linac which has serious discharge problem from September 2008. The beam run is performed during 1 month cycle, which consisted of a 4-5 weeks beam operation and a few days down-period interval. At the recent beam run, approximately 700 h continuous operation was achieved. At every runs, the beam interruption time due to the ion source failure is a few hours, which correspond to the ion source availability of more than 99%. The R and D work is being performed in parallel with the operation in order to enhance the further beam current. As a result, the H{sup -} ion current of 61 mA with normalized rms emittance of 0.26 {pi}mm.mrad was obtained by adding a cesium seeding system to a J-PARC test ion source which has the almost same structure with the present J-PARC ion source.},
doi = {10.1063/1.3637393},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1390,
place = {United States},
year = {2011},
month = {9}
}