1. Integration of 175-MHz LIPAc RF System and RFQ Linac for Beam Commissioning
- Author
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David Regidor, Atsushi Kasugai, Francesco Grespan, Francesco Scantamburlo, Keitaro Kondo, Masayoshi Sugimoto, Keishi Sakamoto, Takahiro Shinya, Michele Comunian, Sunao Maebara, Dominique Gex, Luca Bellan, Yosuke Hirata, Hitoshi Kobayashi, Yoshito Shimosaki, Ken Takayama, Tomoya Akagi, Takashi Ebisawa, Loris Antoniazzi, Ivan Moya, Hervé Dzitko, Puri Mendez, Antti Jokinen, Andrea Pisent, Takahide Nakayama, M. Weber, I. Kirpitchev, Joaquin Molla, Naoya Kubo, A. Palmieri, Philippe Cara, Cristina la de Morena, K. Hayashi, Maurizio Montis, Enrico Fagotti, and Alvaro Marchena
- Subjects
Physics ,Nuclear and High Energy Physics ,business.industry ,RF power amplifier ,Circulator ,Condensed Matter Physics ,01 natural sciences ,Linear particle accelerator ,010305 fluids & plasmas ,Power (physics) ,Optics ,Radio-frequency quadrupole ,0103 physical sciences ,Radio frequency ,business ,Electrical impedance ,Beam (structure) - 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.
- Published
- 2020
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