Resonance Control System for the PIP-II IT HWR Cryomodule

Conference · Tue Aug 10 04:00:00 EDT 2021

DOI:https://doi.org/10.18429/JACoW-IPAC2021-THPAB337· OSTI ID:1854778

Varghese, Philip ^[1]; Chase, Brian ^[1]; Doolittle, Lawrence ^[2]; Hanlet, Pierrick ^[1]; Maniar, Harsh ^[1]; Nicklaus, Dennis ^[1]; Paiagua, Sergio ^[2]; Sankar Raman, Shrividhyaa ^[1]; Serrano, Carlos ^[2]

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1. Fermilab
2. LBNL, Berkeley

The HWR (half-wave-resonator) cryomodule is the first one in the superconducting section of the PIP-II LINAC project at Fermilab. PIP-II IT is a test facility for the project where the injector, warm front-end, and the first two superconducting cryomodules are being tested. The HWR cryomodule comprises 8 cavities operating at a frequency of 162.5 MHz and accelerating beam up to 10 MeV. Resonance control of the cavities is performed with a pneumatically operated slow tuner which compresses the cavity at the beam ports. Helium gas pressure in a bellows mounted to an end wall of the cavity is controlled by two solenoid valves, one on the pressure side and one on the vacuum side. The resonant frequency of the cavity can be controlled in one of two modes. A pressure feedback control loop can hold the cavity tuner pressure at a fixed value for the desired resonant frequency. Alternately, the feedback loop can regulate the cavity tuner pressure to bring the RF detuning error to zero. The resonance controller is integrated into the LLRF control system for the cryomodule. The control system design and performance of the resonance control system are described in this paper.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1854778
• Report Number(s): FERMILAB-CONF-21-831-AD; oai:inspirehep.net:2019351
• Country of Publication: United States
• Language: English

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