Medium-velocity superconducting cavity for high accelerating gradient continuous-wave hadron linear accelerators

McGee, K.; Kim, S.; Elliott, Kyle; Ganshyn, Andrei; Hartung, W.; Metzgar, Ethan; Ostroumov, P. N.; Popielarski, Laura; Popielarski, John; Taylor, A. C.; Xu, Ting; Kelly, Michael; Guilfoyle, B.; Reid, Thomas

doi:10.1103/physrevaccelbeams.24.112003

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…The radiation began to increase at 33 MV/m, so field emission was low during the vertical test. R S of the 650 MHz cavity (blue icon) increased exponentially along with the accelerating gradient in Figure 2, which is typical for cavity EP processed [7,9]. Hence, the cavity was considered qualified to receive mid-T furnace baking.…”

Section: The Process Of Mid-t Furnace Bakingmentioning

confidence: 97%

“…For low-frequency (<1 GHz) elliptical cavities used in colliders and proton/neutron sources [7][8][9], Q 0 usually decreases more quickly along with accelerating gradient than that of 1.3 GHz cavities. Nitrogen doping could increase Q 0 of 650 MHz single-cell β = 0.9 cavity for the Proton Improvement Plan II (PIP-II) project to 7 × 10 10 at medium fields of approximately 15-25 MV/m [7].…”

Section: Introductionmentioning

confidence: 99%

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Quality Factor Enhancement of 650 MHz Superconducting Radio-Frequency Cavity for CEPC

et al. 2022

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Medium-temperature (mid-T) furnace baking was conducted at 650 MHz superconducting radio-frequency (SRF) cavity for circular electron positron collider (CEPC), which enhanced the cavity unloaded quality factor (Q0) significantly. In the vertical test (2.0 K), Q0 of 650 MHz cavity reached 6.4 × 1010 at 30 MV/m, which is remarkably high at this unexplored frequency. Additionally, the cavity quenched at 31.2 MV/m finally. There was no anti-Q-slope behavior after mid-T furnace baking, which is characteristic of 1.3 GHz cavities. The microwave surface resistance (RS) was also studied, which indicated both very low Bardeen–Cooper–Schrieffer (BCS) and residual resistance. The recipe of cavity process in this paper is simplified and easy to duplicate, which may benefit the SRF community.

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Section: The Process Of Mid-t Furnace Bakingmentioning

confidence: 97%