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RIS citation export for TUPO079: Numerical and Experimental Study of H⁻ Beam Dynamics in J-PARC LEBT

AU  - Shibata, T.
AU  - Ikegami, K.
AU  - Liu, Y.
AU  - Miura, A.
AU  - Naito, F.
AU  - Nanmo, K.
AU  - Oguri, H.
AU  - Ohkoshi, K.
AU  - Otani, M.
AU  - Shinto, K.
AU  - Takagi, A.
ED  - Schaa, Volker RW
ED  - Pei, Guoxi
ED  - Chin, Yong Ho
ED  - Fu, Shinian
ED  - Zhao, Ning
TI  - Numerical and Experimental Study of H⁻ Beam Dynamics in J-PARC LEBT
J2  - Proc. of LINAC2018, Beijing, China, 16-21 September 2018
CY  - Beijing, China
T2  - Linear Accelerator Conference
T3  - 29
LA  - english
AB  - Negative hydrogen ion (H⁻) beam dynamics in J-PARC Low Energy Beam Transport (LEBT) has been investigated by numerical modeling which calculates particle transport with effect of space charge and collision processes. Understandings of H⁻ beam transport in LEBT is important for high transmission rate from Ion Source (IS) to Radio Frequency Quadrupole (RFQ) in J-PARC in higher beam current in future. In 2017, 45 mA beam current of H⁻ has been extracted from IS in J-PARC user operation which has been increased from 30 mA in last 2 years. The beam current is planned to be increased to 50 mA in the next upgrade. As the beam current increase, IS/LEBT commissioning becomes more difficult because of the higher space charge (SC). Especially in J-PARC, vacuum pressure is around 10⁻⁵ Pa by 15 mmf orifice located in the center of LEBT. The orifice prevents residual gas injection from IS to LEBT/RFQ and thus produces stronger SC effect. In the presentation, numerical results are compared with actual results from J-PARC Linac beam commissioning. A comparison of the results shows that location of the 15 mmf orifice results in two peaks of RFQ transmission rate against SOL currents.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 519
EP  - 521
KW  - rfq
KW  - linac
KW  - emittance
KW  - solenoid
DA  - 2019/01
PY  - 2019
SN  - 2226-0366
SN  - 978-3-95450-194-6
DO  - DOI: 10.18429/JACoW-LINAC2018-TUPO079
UR  - http://jacow.org/linac2018/papers/tupo079.pdf
ER  -