TY - JOUR
T1 - Fast beam chopper at SARAF accelerator via RF deflector before RFQ
AU - Shor, A.
AU - Vartsky, D.
AU - Dangendorf, V.
AU - Bar, D.
AU - Ben Aliz, Y.
AU - Berkovits, D.
AU - Brandis, M.
AU - Goldberg, M. B.
AU - Grin, A.
AU - Mardor, I.
AU - Mor, I.
AU - Weissman, L.
N1 - Funding Information:
This work was supported by National Science Council, Taiwan, Republic of China, and Taiwan Power Company under the grant number NSC 87-TPC-E-002-023.
PY - 2012/6
Y1 - 2012/6
N2 - We describe design and simulations of a fast beam chopper for the SARAF accelerator based on an RF deflector preceding the RFQ. The SARAF 176 MHz RFQ, takes a DC proton or deuteron beam and accelerates and bunches the beam to 1.5MeV/u and bunches of 0.3ns width (FWHM) every 5.5ns respectively. The deflector acts on the DC beam and sweeps away all but one of the pre-accelerated (pre)-bunches prior to the actual bunching and acceleration in the RFQ. Simulations were performed for a fast beam chopper, where several deflection voltage pulsing schemes have been investigated. The simulations show effective chopping with alternating positive and negative HV applied to the deflector with a fast HV switch, where the beam is transmitted to the RFQ during the cross-over of the rise(fall) of the HV switching. The simulations show that we can obtain efficient deflection of unwanted bunches, with 60% transmission efficiency for the desired bunch. The present design is for a chopper that will provide 0.3ns bunches with a repetition rate of ∼105bunches/sec. Plans for a fast chopper with higher repetition rates of ∼ 106 Hz are discussed.
AB - We describe design and simulations of a fast beam chopper for the SARAF accelerator based on an RF deflector preceding the RFQ. The SARAF 176 MHz RFQ, takes a DC proton or deuteron beam and accelerates and bunches the beam to 1.5MeV/u and bunches of 0.3ns width (FWHM) every 5.5ns respectively. The deflector acts on the DC beam and sweeps away all but one of the pre-accelerated (pre)-bunches prior to the actual bunching and acceleration in the RFQ. Simulations were performed for a fast beam chopper, where several deflection voltage pulsing schemes have been investigated. The simulations show effective chopping with alternating positive and negative HV applied to the deflector with a fast HV switch, where the beam is transmitted to the RFQ during the cross-over of the rise(fall) of the HV switching. The simulations show that we can obtain efficient deflection of unwanted bunches, with 60% transmission efficiency for the desired bunch. The present design is for a chopper that will provide 0.3ns bunches with a repetition rate of ∼105bunches/sec. Plans for a fast chopper with higher repetition rates of ∼ 106 Hz are discussed.
KW - Accelerator Applications
KW - Accelerator Subsystems and Technologies
KW - Accelerator modeling and simulations (multi-particle dynamics
KW - Instrumentation for neutron sources
KW - single-particle dynamics)
UR - http://www.scopus.com/inward/record.url?scp=84862868520&partnerID=8YFLogxK
U2 - 10.1088/1748-0221/7/06/C06003
DO - 10.1088/1748-0221/7/06/C06003
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AN - SCOPUS:84862868520
VL - 7
JO - Journal of Instrumentation
JF - Journal of Instrumentation
SN - 1748-0221
IS - 6
M1 - C06003
ER -