Development of Large Grain/Single Crystal Niobium Cavity Technology at Jefferson Lab

Journal Article · Thu Aug 09 04:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2770681· OSTI ID:21067385

Kneisel, P; Myneni, G R; Ciovati, G ^[1]; Sekutowicz, J ^[2]; Carneiro, T ^[3]

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1. Jefferson Lab, 12000 Jefferson Ave., Newport News, VA 23606 (United States)
2. DESY, 22603 Hamburg (Germany)
3. CBMM, Araxa (Brazil)

Approximately two years ago we started to develop high performance niobium accelerating cavities based on large grain or single crystal high purity niobium. We have fabricated and tested 15 single cell cavities of various shapes and frequencies between 1300 MHz and 2300 MHz using material from a total of 9 different very large grain niobium ingots from four niobium suppliers. The materials differed not only in grain sizes, but also in RRR - value and in the amount of Ta contained in the material. In one ingot supplied by CBMM the central grain exceeded 7 inches in diameter and this was used to fabricate two 2.2 GHz cavities. A single crystal 1300 MHz mono-cell cavity was also produced at DESY by rolling out a single crystal to the size required for this cavity. It was sent to Jlab for surface treatment and testing. In addition, we have fabricated three 7-cell cavities: two of the Jlab high gradient (HG) shape and one of the ILC Low Loss shape. Two 9-cell TESLA shape cavities are presently in fabrication at Jlab and are close to completion.

• OSTI ID: 21067385
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 927; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CEBAF ACCELERATOR
CRYSTAL STRUCTURE
GHZ RANGE
GRAIN SIZE
IMPURITIES
MHZ RANGE
MONOCRYSTALS
NIOBIUM
PERFORMANCE
ROLLING
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTORS
SURFACE TREATMENTS