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Preliminary Cryogenic Cold Test Results of the First 9-Cell LSF Shape Cavity

Conference ·
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [7];  [1]
  1. Jefferson Lab
  2. Fermilab
  3. J-PARC
  4. KEK, Tsukuba
  5. Kyoto U., Inst. Chem. Res.
  6. SLAC
  7. Cornell U., CLASSE
+ Show Author Affiliations
Following successful prototyping and testing of single- & 5-cell LSF shape cavities *, **, the first 9-cell LSF shape cavity LSF9-1 was successfully constructed using an innovative process at JLab with the in-house facilities. The cavity was then shipped to KEK for post-fabrication mechanical adjustment and ILC TDR style treatment and surface processing. Cold testing was carried out at the JLab VTA facility, instrumented with a suite of Kyoto instruments. Favorable values for the bath pressure detuning sensitivity and Lorentz force detuning coefficient were experimentally measured, validating the design improvement in cell stiffeners. Pass-band measurements indicate 4 out of 9 cells reaching gradient capability of > 45 MV/m, including 2 cells reaching 51 MV/m. Cornell OST detectors identified the cell and location responsible for the current hard quench limit. Multipacting-like barriers observed in end cells are investigated both analytically and numerically. The cavity was shipped to FNAL and received a light EP at the joint ANL/FNAL facility for further cold testing at Jlab. Two new 9-cell LSF cavities are being constructed including one made of large-grain niobium material.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1854874
Report Number(s):
FERMILAB-CONF-21-794-TD; oai:inspirehep.net:2025698
Country of Publication:
United States
Language:
English

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Related Subjects

43 PARTICLE ACCELERATORS