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Reducing field emission in superconducting RF cavities for the next generation of particle accelerators

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9 Author(s)
Shu, Q.S. ; Lab. of Nucl. Studies, Cornell Univ., Ithaca, NY, USA ; Hartung, W. ; Leibovich, A. ; Kirchgessner, J.
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Heat treatment up to 1500°C in an ultrahigh-vacuum furnace, along with processing of cavities and temperature mapping was used to suppress field emission and analyze emitter properties. In 27 tests of one-cell 1500-MHz fired accelerating cavities, on the average the accelerating field, Eacc, increased to 24 MV/m (Hpk=1250 Oe) from 13 MV/m with chemical treatment alone; the highest Eacc reached was 30.5 MV/m. Emitter properties, efficiency of He processing, and results of the exposure of well-processed RF surfaces to various media are also discussed

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )