TY - JOUR
T1 - Beam loading compensation for acceleration of multi-bunch electron beam train
AU - Liu, Shengguang
AU - Fukuda, Masafumi
AU - Araki, Sakae
AU - Terunuma, Nobuhiro
AU - Urakawa, Junji
AU - Hirano, Koichiro
AU - Sasao, Noboru
N1 - Funding Information:
Shengguang Liu was financially supported by the JSPS postdoctoral fellowships for foreign researchers. Junji Urakawa also received support from a Grant-in-Aid for Creative Scientific Research from the JSPS (KAKENHI 17GS0210) and from the Core-University Program of the JSPS.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/1/1
Y1 - 2008/1/1
N2 - The laser undulator compact X-ray source (LUCX) is a test bench used with the compact, high-brightness X-ray generator at KEK (High Energy Accelerator Research Organization). Our group is conducting experiments with LUCX to demonstrate the possibility of K-edge digital subtraction angiography, based on Compton scattering. One of the challenging problems is to generate high-brightness multi-bunch electron beams to compensate for the energy difference arising from the beam loading effect. In this paper we calculate the transient beam loading voltage and energy gain from the RF field in the gun and accelerating tube for a multi-bunch train. To do so we consider the process by which the RF field builds up in the gun and accelerating tube, and the special shape of the RF pulse. We generate and accelerate 100 bunches with a 50 nC electron bunch train, effectively compensating for the beam loading effect by adjusting the injection timing. Using a beam position monitor (BPM) and optical transition radiation (OTR) system, we measure the electron beam energy bunch by bunch. The average energy of a 100-bunch train is 40.5 MeV and the maximum energy difference from bunch to bunch is 0.26 MeV.
AB - The laser undulator compact X-ray source (LUCX) is a test bench used with the compact, high-brightness X-ray generator at KEK (High Energy Accelerator Research Organization). Our group is conducting experiments with LUCX to demonstrate the possibility of K-edge digital subtraction angiography, based on Compton scattering. One of the challenging problems is to generate high-brightness multi-bunch electron beams to compensate for the energy difference arising from the beam loading effect. In this paper we calculate the transient beam loading voltage and energy gain from the RF field in the gun and accelerating tube for a multi-bunch train. To do so we consider the process by which the RF field builds up in the gun and accelerating tube, and the special shape of the RF pulse. We generate and accelerate 100 bunches with a 50 nC electron bunch train, effectively compensating for the beam loading effect by adjusting the injection timing. Using a beam position monitor (BPM) and optical transition radiation (OTR) system, we measure the electron beam energy bunch by bunch. The average energy of a 100-bunch train is 40.5 MeV and the maximum energy difference from bunch to bunch is 0.26 MeV.
KW - BPM
KW - Beam loading
KW - Compton scattering
KW - Energy spread
KW - Multi-bunch
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U2 - 10.1016/j.nima.2007.09.053
DO - 10.1016/j.nima.2007.09.053
M3 - Article
AN - SCOPUS:36849061705
SN - 0168-9002
VL - 584
SP - 1
EP - 8
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1
ER -