Performance of Single Crystal Niobium Cavities

Conference · Tue Jul 01 04:00:00 EDT 2008

OSTI ID:955821

Kneisel, Peter; Ciovati, Gianluigi; Singer, Waldemar; Singer, Xenia; Reschke, Detlef; Brinkmann, A

We have fabricated and tested a total of six single cell niobium cavities, made from single crystal, high purity niobium. Two of the three cavities of the TESLA shape (1300 MHz) were made from Heraeus niobium by extending a smaller single crystal by rolling and annealing steps; the third cavity was made by spinning from CBMM material. The three other cavities of the scaled "Low Loss" (LL) shape (two) and "High Gradient" (HG) shape (one) resonated at 2.3 GHz and were fabricated from "as received" single crystals, both from Heraeus and CBMM niobium. After appropriate surface treatments by buffered chemical polishing and electropolishing most cavities performed quite nicely and peak surface magnetic fields of ~ 160 mT or above corresponding to accelerating gradients between 38 MV/m and 45 MV/m were reached. This paper reports about the performance of these cavities.

• Research Organization: Thomas Jefferson Lab National Accelerator Facility
• Sponsoring Organization: USDOE
• OSTI ID: 955821
• Report Number(s): JLAB-ACC-08-842; DOE/OR/23177-0414
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ANNEALING
CAVITIES
CHEMICAL POLISHING
ELECTROPOLISHING
MAGNETIC FIELDS
MONOCRYSTALS
NIOBIUM
PERFORMANCE
ROLLING
SHAPE
SURFACE TREATMENTS