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

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 tot...

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Bibliographic Details
Main Authors: Kneisel, P, Myneni, G R, Ciovati, G, Sekutowicz, J, Carneiro, T
Format: Conference Proceeding
Language:English
Subjects:
CEBAF ACCELERATOR
CRYSTAL STRUCTURE
GHZ RANGE
GRAIN SIZE
IMPURITIES
MATERIALS SCIENCE
MHZ RANGE
MONOCRYSTALS
NIOBIUM
ROLLING
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTORS
SURFACE TREATMENTS
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Summary: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.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2770681