CEBAF SRF Performance during Initial 12 GeV Commissioning

Bachimanchi, Ramakrishna; Allison, Trent; Daly, Edward; Drury, M.; Hovater, C.; Lahti, G.; Mounts, Clyde; Nelson, Richard M.; Plawski, Tomasz

doi:10.18429/jacow-ipac2015-thxb1

Cited by 2 publications

(1 citation statement)

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“…Depending on the dose-rate limit, CM C75-01 could deliver a beam energy from 57 MeV, if all cavities would operate below their FE onset, to 72 MeV, if all cavities would operate at their E op -value. The experience with the C100 CMs, operating in CEBAF at similar accelerating gradient as expected for C75 CMs, suggests that FE maybe the main operational limitation of C75 CMs as well [12,13]. The energy gain provided by the CMs will likely result from a balance between pushing the CEBAF energy to 12 GeV, with some margin, and limit the radiation dose rate in the tunnel to avoid premature failure of components.…”

Section: Discussionmentioning

confidence: 97%

Cavity Production and Testing of the First C75 Cryomodule for CEBAF

Ciovati

Cheng

Daly

et al. 2022

International Conference on RF Superconductivity (20th), East Lansing, MI, USA, 28 June-02 July 2021

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The CEBAF cryomodule rework program was updated over the last few years to increase the energy gain of refurbished cryomodules to 75 MeV. The concept recycles the waveguide end-groups from original CEBAF cavities fabricated in the 1990s and replaces the five elliptical cells in each with a new optimized cell shape fabricated from large-grain, ingot Nb material. Eight cavities were fabricated at Research Instruments, Germany, and two cavities were built at Jefferson Lab. Each cavity was processed by electropolishing and tested at 2.07 K. The best eight cavities were assembled into "cavity pairs" and re-tested at 2.07 K, before assembly into the cryomodule. All but one cavity in the cryomodule were within 10% of the target accelerating gradient of 19 MV/m with a quality factor of 8×10 9 . The performance limitations were field emission and multipacting.

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Section: Discussionmentioning

confidence: 97%