| Title |
Developments Towards FRIB Upgrade to 400 MeV/u for Heaviest Uranium Ions |
| Authors |
- K.E. McGee, K. Elliott, A. Ganshyn, W. Hartung, S.H. Kim, P.N. Ostroumov, J.T. Popielarski, L. Popielarski, A. Taylor, T. Xu
FRIB, East Lansing, Michigan, USA
- G.V. Eremeev, F. Furuta, M. Martinello, O.S. Melnychuk, A.V. Netepenko
Fermilab, Batavia, Illinois, USA
- B.M. Guilfoyle, M.P. Kelly, T. Reid
ANL, Lemont, Illinois, USA
|
| Abstract |
High-Q₀ medium-velocity (beta opt = 0.6) 5-cell elliptical cavities for superconducting linacs are critical technology for advancing current and future projects such as the Proton Improvement Plan II linac and the proposed energy upgrade of Michigan State University’s Facility For Rare Isotope Beams linac, FRIB400. Previous work established the validity of the novel geometry of the FRIB400 prototype 644 MHz 5-cell elliptical β = 0.65 cavities for future high Q₀ development. In collaboration with FNAL, two leading-edge high-Q₀ recipes, N-doping and Mid-T baking, were tested in the 5-cell format. 2/0 N-doping + cold electropolishing was successful at achieving FRIB400 and PIP-II Q₀ requirements, achieving an unprecedented 3.8 x 10¹⁰ at 17.5 MV/m, satisfying the FRIB400 Q₀ requirements by 1.75 times in a low-gauss environment. Mid-T baking exceeded FRIB400 Q₀ requirements by 1.4 times, and benefitted from decreased residual resistance compared to the N-doped cavity test. Systematic ultrasonic thickness measurements in single-cell revealed bulk (150 microns) EP with the modified EP tool is consistent across the inner surfaces of the cavity walls.
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| Paper |
download TH1AA02.PDF [1.301 MB / 4 pages] |
| Slides |
download TH1AA02_TALK.PDF [44.708 MB] |
| Cite |
download ※ BibTeX
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※ EndNote |
| Conference |
LINAC2022 |
| Series |
International Linear Accelerator Conference (31st) |
| Location |
Liverpool, UK |
| Date |
28 August-02 September 2022 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Peter McIntosh (STFC DL, Daresbury, UK); Graeme Burt (Lancaster Univ., Lancaster, UK); Robert Apsimon (Lancaster Univ., Lancaster, UK); Volker R.W. Schaa (GSI, Darmstadt, Germany) |
| Online ISBN |
978-3-95450-215-8 |
| Online ISSN |
2226-0366 |
| Received |
11 August 2022 |
| Revised |
22 August 2022 |
| Accepted |
23 September 2022 |
| Issue Date |
14 October 2022 |
| DOI |
doi:10.18429/JACoW-LINAC2022-TH1AA02 |
| Pages |
653-656 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
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