Performance of 3-cell Seamless Niobium cavities

Conference · Sun Nov 01 04:00:00 EST 2009

OSTI ID:1115736

Kneisel, Peter K. ^[1]; Ciovati, Gianluigi ^[2]; Jelezov, I. ^[3]; Singer, W. ^[3]; Singer, X. ^[3]

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1. JLAB
2. JLBA
3. DESY, Hamburg

In the last several months we have surface treated and cryogenically tested three TESLA-type 3-cell cavities, which had been manufactured at DESY as seamless assemblies by hydroforming. The cavities were completed at JLab with beam tube/flange assemblies. All three cavities performed very well after they had been post-purified with titanium at 1250C for 3 hrs. The cavities, two of which consisted of an end cell and 2 center cells and one was a center cell assembly, achieved gradients of Eacc = 32 MV/m, 34 MV/m and 35 MV/m without quenches. The performance was limited by the appearance of the “Q-drop” in the absence of field emission. This contribution reports about the various measurements undertaken with these cavities.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1115736
• Report Number(s): JLAB-ACC-09-1070; DOE/OR/23177-1092
• Country of Publication: United States
• Language: English

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