Functional Overview of the RF Power System for the LIPAc RFQ

Weber, M.; Shinya, Takahiro; Moya, Iván; Méndez, P.; Regidor, David; Morena, Cristina de la; Forteza, Jose Maria; Gil, Pilar; Marchena, Alvaro; Kirpitchev, I.; García, A. R.; Mollá, J.; Kubo, Naoya; Hayashi, K.; Mendez, Miguel Alfonso; Thomsen, Jeff; Akagi, Tomoya; Antoniazzi, L.; Bellan, Luca; Brañas, B.; Cara, Philippe; Carin, Yann; Giacomo, Marco Di; Dzitko, Hervé; Desmons, M.; Ebisawa, Takashi; Fagotti, E.; Garcia-Caro, Ignacio; Gex, Dominique; Grespan, Francesco; Gutierrez, Victor; Ibarra, Á.; Ikeda, Yoshitaka; Ikeda, Y.; Jiménez-Rey, D.; Jokinen, Antti; Kasugai, Atsushi; Kitano, T.; Knaster, J.; Kobayashi, Hitoshi; Kondo, Keitaro; Lopez, Antonio Miguel; Maebara, S.; Bertrand, Romain; O’hira, Shigeru; Palmieri, Antonio; Phillips, G.; Podadera, Ivan; Sakamoto, K.; Sanchez, J.; Scantamburlo, Francesco; Sugimoto, M.; Takayama, Ken; Vandeplassche, D.

doi:10.1109/tps.2021.3102840

Cited by 2 publications

(2 citation statements)

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“…During the first commissioning and conditioning campaign necessary to achieve acceleration of 1ms beam pulse, a series of improvements and additional features were included in the RF system as described in [6]. Before restarting the conditioning campaign at duty cycle (d.c.) higher than 5%, two important improvements were introduced.…”

Section: System Improvementsmentioning

confidence: 99%

“…The power is fed by 8 independent chains each of which is comprised by a solid state pre-driver (500W max), a tetrode driver (16kW max), a tetrode final amplifier (200kW max) and a circulator with a matched and cooled load in its return port. The 8 chains are synchronized and driven by a LLRF with a White Rabbit interface [6]. We report here the status of the progress of the conditioning of the RFQ towards CW, the challenges encountered and the strategy forward.…”

Section: Introductionmentioning

confidence: 99%

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RF conditioning towards continuous wave of the RFQ of the Linear IFMIF Prototype Accelerator

De Franco,

Comunian,

Fagotti

et al. 2024

J. Phys.: Conf. Ser.

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The Linear IFMIF Prototype Accelerator (LIPAc) is designed to accelerate 125mA of deuteron beam to 9MeV in continuous wave (CW). The superconductive RF Linac has not yet been installed and the final accelerating stage now under commissioning is the RFQ. This system has been designed and developed by INFN (Italy) before installation in QST (Japan). The RFQ is the longest in the World with its 9.8m and requires RF power injection from 8 independent and synchronized coupler ports. LIPAc demonstrated the acceleration of 125mA deuteron beam at 5MeV for 1ms with a 1s repetition period in 2019. A fundamental milestone to extend beam operations to CW is the completion of the RFQ cavity RF conditioning up to CW. This work presents the strategy followed to successfully reach CW RF injection at 80% of the nominal 132kV vane voltage. The field distribution correction scheme (acting on cooling system at various power levels) was successfully verified. We discuss as well the main challenges encountered on the way, which include updates of the RF system, failure of a circulator (by arcs) and the damages occurred on some of the RF couplers. Finally, the recent status and outlook will be provided.

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Section: System Improvementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%