Keyword: superconductivity
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MOPA42 Considerations Concerning the Use of HTS Conductor for Accelerator Dipoles with Inductions above 15 T dipole, induction, quadrupole, niobium 143
 
  • M.A. Green
    LBNL, Berkeley, California, USA
  
  Funding: This work was supported by the office of Science, under US Department of Energy contract number DE-AC-02-05CH11231.
The use of high tem­per­a­ture su­per­con­duc­tors for ac­cel­er­a­tor di­pole has been dis­cussed for about twenty years and maybe a lit­tle more. Con­duc­tors that can po­ten­tially be used for ac­cel­er­a­tor mag­nets have been avail­able for about fif­teen years. These con­duc­tors are REBCO tape con­duc­tors, which can be wound into coils with no re­ac­tion after wind­ing, and BISSCO cable con­duc­tors, which re­quire re­ac­tion after wind­ing and in­su­la­tion after re­ac­tion in a process sim­i­lar to Nb3Sn ca­bles. Both con­duc­tors are ex­pen­sive and the process after re­act­ing is ex­pen­sive. Some un­known fac­tors that re­main: Will ei­ther con­duc­tor de­grade in cur­rent car­ry­ing ca­pac­ity with re­peated cy­cling like Nb3Sn ca­bles do? The other two is­sues are prob­lems for both types of HTS con­duc­tors and they are; 1) quench pro­tec­tion in the event of a nor­mal re­gion run-away and 2) deal­ing with the su­per­con­duct­ing mag­ne­ti­za­tion in­her­ent with HTS ca­bles and tapes. This paper will dis­cuss the last two is­sues and maybe will pro­vide a par­tial so­lu­tion to these prob­lems. 		 
poster icon Poster MOPA42 [1.498 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA42  
About • Received ※ 01 August 2022 — Revised ※ 08 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 23 August 2022
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WEPA31 Lower Temperature Annealing of Vapor Diffused Nb3Sn for Accelerator Cavities cavity, SRF, experiment, electron 695
 
  • J.K. Tiskumara, J.R. Delayen
    ODU, Norfolk, Virginia, USA
  • G.V. Eremeev
    Fermilab, Batavia, Illinois, USA
  • U. Pudasaini
    JLab, Newport News, Virginia, USA
  
  Nb3Sn is a next-gen­er­a­tion su­per­con­duct­ing ma­te­r­ial for the ac­cel­er­a­tor cav­i­ties with higher crit­i­cal tem­per­a­ture and su­per­heat­ing field, both twice com­pared to Nb. It promises su­pe­rior per­for­mance and higher op­er­at­ing tem­per­a­ture than Nb, re­sult­ing in sig­nif­i­cant cost re­duc­tion. So far, the Sn vapor dif­fu­sion method is the most pre­ferred and suc­cess­ful tech­nique to coat nio­bium cav­i­ties with Nb3Sn. Al­though sev­eral post-coat­ing tech­niques (chem­i­cal, elec­tro­chem­i­cal, me­chan­i­cal) have been ex­plored to im­prove the sur­face qual­ity of the coated sur­face, an ef­fec­tive process has yet to be found. Since there are only a few stud­ies on the post-coat­ing heat treat­ment at lower tem­per­a­tures, we an­nealed Nb3Sn-coated sam­ples at 800 C - 1000 C to study the ef­fect of heat treat­ments on sur­face prop­er­ties, pri­mar­ily aimed at re­mov­ing sur­face Sn residues. This paper dis­cusses the sys­tem­atic sur­face analy­sis of coated sam­ples after an­neal­ing at tem­per­a­tures be­tween 850 C and 950 C.  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEPA31  
About • Received ※ 02 August 2022 — Revised ※ 05 August 2022 — Accepted ※ 07 August 2022 — Issue date ※ 02 September 2022
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THYE6 First Demonstration of a ZrNb Alloyed Surface for Superconducting Radio-Frequency Cavities cavity, SRF, radio-frequency, electron 881
 
  • Z. Sun, M. Liepe, T.E. Oseroff
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  Sur­face de­sign of the RF sur­face is a promis­ing path to next-gen­er­a­tion SRF cav­i­ties. Here, we re­port a new strat­egy based on ZrNb sur­face al­loy­ing. Ma­te­r­ial de­vel­op­ment via an elec­tro­chem­i­cal process will be de­tailed. RF per­for­mance eval­u­ated in the Cor­nell sam­ple host cav­ity will be dis­cussed. Cor­nell demon­strates that ZrNb al­loy­ing is a vi­able new tech­nol­ogy to im­prove the per­for­mance of SRF cav­i­ties.  
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DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-THYE6  
About • Received ※ 22 July 2022 — Accepted ※ 08 August 2022 — Issue date ※ 20 August 2022  
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