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Suppression of Initial Energy Spreads by Transient Beam Loading Effect in Pulsed RF Linacs for Intense Electron Beam

Title
Suppression of Initial Energy Spreads by Transient Beam Loading Effect in Pulsed RF Linacs for Intense Electron Beam
Authors
김상훈
Date Issued
2012
Publisher
포항공과대학교
Abstract
For intense irradiation applications, an L-band electron linac is developed in collaboration with PAL/POSTECH and KAPRA. It is capable of producing 10-MeV and average 30-kW electron beams adopting an L-band traveling-wave accelerating structure. This linac is operated under the fully beam-loaded condition for power efficiency. Under this condition, the initial energy spread becomes a maximum generated by the transient beam loading effect. Since irradiation sources require a beam energy of less than 10 MeV for radiation safety, those energy spreads are suppressed in order to maintain the beam energy at a safe level but maximize the beam power. In this study, beam current modulation with RF power modulation is adopted for the suppression method. As a result, the average beam energy and the corresponding beam power are improved by nearly 60% compared with the case without any modulations. The temporal profile of beam energy is numerically calculated from the time-dependent beam loading relationship, and it is verified with measurement using aluminium plates. The effects of beam current modulation on the bunching and acceleration are also discussed.
URI
http://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001221366
http://oasis.postech.ac.kr/handle/2014.oak/1530
Article Type
Thesis
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