15-20 October 2017
Europe/Zurich timezone

Conditions to Minimize Co-Extracted Electron Current and Beam Quality in J-PARC Cesiated RF-Driven Hˉ Ion Source 66 mA Operation

16 Oct 2017, 15:40


Centre international de Conférence Genève (CICG). http://www.cicg.ch/
Oral presentaion Negative ion sources 3rd Session


Dr Akira Ueno (J-PARC)


The beam brightness of the J-PARC (Japan Proton Accelerator Research Complex) cesiated rf-driven Hˉ ion source has been increased by using several unique measures, including low plasma electrode temperature, slight water feeding in hydrogen plasma and so on [1-3]. The J-PARC source enables high energy linear accelerators to eject a beam with 60 mA peak intensity. The conditions to minimize the co-extracted electron current lower than the Hˉ ion current of 66 mA and the beam qualities attained with the conditions are presented in this paper. The low co-extracted electron current will be necessary for a higher beam duty factor operation.

[1] A. Ueno, New J. Phys. 19 (2017) 015004
[2] A. Ueno et. al., "Emittance improvements of cesiated RF-drivenH− ion source to enable 60 mA operation of high-energy and high-intensity LINACs by plasma impurity controls" to be published in AIP Conf. Proc. NIBS 2016
[3] A. Ueno et. al., "Transverse RMS emittance evaluation based upon explicit and reasonable definitions of 100% and 95% beams" to be published in AIP Conf. Proc. NIBS 2016

Primary authors

Dr Akira Ueno (J-PARC) Mr Kiyonori Ohkoshi (J-PARC) Mr Kiyoshi Ikegami (J-PARC) Mr Akira Takagi (J-PARC) Dr Katsuhiro Shinto (J-PARC) Dr Hidetomo Oguri (J-PARC)

Presentation materials