Suppression of Initial Energy Spreads by Transient Beam Loading Effect in Pulsed RF Linacs for Intense Electron Beam
- Suppression of Initial Energy Spreads by Transient Beam Loading Effect in Pulsed RF Linacs for Intense Electron Beam
- Date Issued
- 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
- Article Type
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.