Tests on superconducting helix resonators

Benaroya, R.; Jaffey, A.H.; Johnson, K.; Khoe, T. K.; Livingood, J. J.; Nixon, J.M.; Parker, G. W.; Ramler, W. J.; Aron, Jacob; Wesołowski, Włodzimierz

doi:10.1063/1.1654359

Cited by 15 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Filtered air was then tried. The bare cavity results were duplicated but this time there was no deterioration in either the field or the Q o of the anodized cavity, which corroborates our previous conclusion 10 on the stability of airexposed anodized cavities. That is, it seems likely that CJI was exposed to dust when air was admitted .…”

Section: Anodized Surfacessupporting

confidence: 79%

A high-performance Nb helical cavity

et al. 1975

Self Cite

View full text Add to dashboard Cite

A 92-MHz superconductlng-Nb helix resonator of exceptional quality has been thoroughly tested under a variety of conditions. The unit Is a full-scale X/2 structure with dimensions appropriate for heavy-Ion acceleration. When operated at a temperature of 1.8K and with bare (net anodlzed) Nb surfaces, the lowfield Q Is 9.4 x 10*, equivalent to a surface resistance of 5 x 10" 10 ohms. The maximum surface magnetic field is 1200 G and the maximum surface electric field is 37 MV/m, which corresponds to a traveling-wave axial accelerating field of 4.6 MV/m. These characteristics set new performance standards for helix resonators. A systematic study of the effects of various surface treatments, including abuses of the cavity, are described. The tests consist of 24 liquid helium cooldowns, at 4.2K and 1.8K, of the cavity with bare and anodized Nb surfaces which at various times were electropollshed, oxypollshed and heat treated. RF and helium conditioning are discussed as techniques to get through multlpactorlng barriers and extend the maximum obtainable electric field.

show abstract

Section: Anodized Surfacessupporting

confidence: 79%

A high-performance Nb helical cavity

et al. 1975

Self Cite

View full text Add to dashboard Cite

show abstract

“…In that period Warren Ramler, in the Chemistry Division at Argonne National Laboratory, initiated a program to study the possibility of using RF superconductivity to accelerate ions. That work was first reported in 1971 in the Chemistry Division Annual Report and subsequent later publications tracked the progress of that study [1]. The first acceleration of a proton beam with an RF helical superconducting structure was reported in 1973 [2].…”

Section: Introduction and History Of Superconducting Rf At Atlasmentioning

confidence: 93%