Abstract
Abstract
The Linear IFMIF Prototype Accelerator, LIPAc, is being
commissioned aiming at validating the RFQ up to 5 MeV
beam acceleration. Eventually, the nominal beam of
5 MeV–125 mA in 1 ms length and
1 Hz rate pulsed mode was achieved in 2019. The beam
operation has been resumed since July 2023 after a long maintenance
including recovery from unexpected problems in the RFQ-RF
system. This new phase aims at the commissioning of the full
configuration except SRF LINAC, which is replaced by a temporary
beam transport line. Focusing on the RFQ behavior, it will be
interesting to operate it at higher duty, especially for longer
pulses. Furthermore, a beam simulation study suggested that the beam
extracted from the RFQ includes considerable momentum halo when the
vane voltage reduces by more than 5 %, with a slight decrease of
the mean energy. It can be a potential source of a quench like the
mismatched beam in the cryomodule. This could be studied by
measuring the energy from the Time-of-Flight among multiple BPMs
while monitoring beam loss around the dipole, where momentum halo
should be lost. During the beam commissioning phase, we studied them
by scanning the RFQ voltage.
Reference17 articles.
1. Overview of the IFMIF/EVEDA project;Knaster;Nuclear Fusion,2017
2. Validation of the Linear IFMIF Prototype Accelerator (LIPAc) in Rokkasho;Kondo;Fusion Engineering and Design,2020
3. Lattice Design for 5MeV-125 mA CW RFQ Operation in the LIPAc;Shimosaki,2019
4. Manufacturing and Validation Tests of IFMIF Low-Beta HWRs;Devanz,2017
5. The LIPAc beam dump;Brañas;Fusion Engineering and Design,2018