학술논문
Integration of 175-MHz LIPAc RF System and RFQ Linac for Beam Commissioning
Document Type
Periodical
Author
Shinya, T.; Weber, M.; Fagotti, E.; Hayashi, K.; Kubo, N.; Marchena, A.; Moya, I.; Regidor, D.; Scantamburlo, F.; Akagi, T.; Antoniazzi, L.; Bellan, L.; Cara, P.; Comunian, M.; Dzitko, H.; Ebisawa, T.; Gex, D.; Grespan, F.; Hirata, Y.; Jokinen, A.; Kasugai, A.; Kirpitchev, I.; Kobayashi, H.; Kondo, K.; Maebara, S.; Mendez, P.; Molla, J.; Montis, M.; de Morena, C.l.; Nakayama, T.; Palmieri, A.; Pisent, A.; Sakamoto, K.; Shimosaki, Y.; Sugimoto, M.; Takayama, K.
Source
IEEE Transactions on Plasma Science IEEE Trans. Plasma Sci. Plasma Science, IEEE Transactions on. 48(6):1489-1495 Jun, 2020
Subject
Language
ISSN
0093-3813
1939-9375
1939-9375
Abstract
The eight-chain RF system and radio frequency quadrupole (RFQ) linac were successfully integrated at the facility of the Linear IFMIF Prototype Accelerator (LIPAc). We achieved an unprecedented high current deuteron beam up to 55 mA in pulse operation ( $300~\mu \text{s}$ , 1 Hz). The keys of the success were (1) understanding reflected power from RFQ to RF system, (2) tuning each RF chain individually, (3) intensive RF conditioning for holding the stable RF power in the RFQ, and (4) optimizing the beam loading compensation control. Interestingly, the reflection at the breakdown in RF conditioning was higher than an estimation and reached up to 600 kW so far. In order to avoid damage on tetrodes by the high reflection, the impedance of each circulator was accurately adjusted.