Publications
Publication Information
| Title | 4 K SRF Operation of the 10 MeV CEBAF Photo-Injector |
| Authors | Michael Drury, Grigory Eremeev, Joseph Grames, Reza Kazimi, Bernard Poelker, Joseph Preble, Riad Suleiman, Yan Wang, Mathew Wright |
| JLAB number | JLAB-ACC-16-2422 |
| LANL number | (None) |
| Other number | DOE/OR/23177-4078 |
| Document Type(s) | (Meeting) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Meeting Paper compiled for LINAC2016 Proceedings LINAC 2016 Edited By JACOW (0) | |
| Publication Abstract: | Superconducting radio-frequency (SRF) accelerating cavities are often operated in superfluid liquid helium with temperature near 2 K to enhance the cavity quality factor Q0 and to help manage heat loads, which are particularly important at large SRF accelerator facilities. This 2 K temperature paradigm, however, need not put SRF technology out of the reach of small institutions or even limit SRF operation at large facilities that need 10-100 MeV beam energy. At the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab there are regularly scheduled maintenance periods during which cryogenic plant often increases the liquid helium temperature from 2 K to 4 K, reducing power consumption by ~ 50 % and saving megawatts of wall-plug power. During recent maintenance periods, we accelerated a continuous-wave electron beam at the CEBAF photo-injector to a total energy of 6.3 MeV at currents up to 80 uA using two 5-cell niobium cavities in the quarter-cryomodule at 4 K. This contribution describes the SRF and cryogenic performance and uses measured beam quality and energy stability as key metrics. These measurements indicate that 4 K operation of niobium SRF cavities in CEBAF is a sensible and cost effective mode for high quality beam operation, provided the cryogenic load associated with lower Q0 is manageable for the number of cavities needed to operate. For Jefferson Lab, this enhances our scientific reach allowing additional low-energy ~ 10 MeV experiments each year. |
| Experiment Numbers: | |
| Group: | SRF Research & Dev |
| Document: | |
| DOI: | https://doi.org/10.18429/JACoW-LINAC2016-MOPLR010 |
| Accepted Manuscript: | moplr010.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |