Author: Maniscalco, J.T.
Paper Title Page
TUPO054 Fundamental Studies of Impurity Doping in 1.3 GHz and Higher Frequency SRF Cavities 458
SPWR018   use link to see paper's listing under its alternate paper code  
TUOP01   use link to see paper's listing under its alternate paper code  
 
  • J.T. Maniscalco, P.N. Koufalis, M. Liepe
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  As the de­mand for more pow­er­ful, more ef­fi­cient, and smaller su­per­con­duct­ing RF ac­cel­er­a­tors con­tin­ues to in­crease, both im­pu­rity dop­ing and high-fre­quency cav­i­ties (> 1.3 GHz) have be­come hot top­ics for fun­da­men­tal re­search be­cause of their po­ten­tial to sig­nif­i­cantly de­crease sur­face losses and cost re­spec­tively. In this re­port, we pre­sent re­cent ex­per­i­men­tal and the­o­ret­i­cal re­sults on un­doped and ni­tro­gen-doped high-fre­quency cav­i­ties and on al­ter­na­tive dop­ing agents in tra­di­tional 1.3 GHz cav­i­ties, with a focus on un­der­stand­ing the fun­da­men­tal sci­ence of im­pu­rity dop­ing.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO054  
About • paper received ※ 16 September 2018       paper accepted ※ 19 September 2018       issue date ※ 18 January 2019  
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TUPO055 Next Generation Nb3Sn SRF Cavities for Linear Accelerators 462
 
  • R.D. Porter, D.L. Hall, M. Liepe, J.T. Maniscalco
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • T. Arias, P. Cueva, D.A. Muller, N. Sitaraman
    Cornell University, Ithaca, New York, USA
  
  Nio­bium-3 Tin (Nb3Sn) is a very promis­ing al­ter­na­tive ma­te­r­ial for SRF ac­cel­er­a­tor cav­i­ties. The ma­te­r­ial can achieve higher qual­ity fac­tors, higher tem­per­a­ture op­er­a­tion and po­ten­tially higher ac­cel­er­at­ing gra­di­ents (~ 96 MV/m) com­pared to con­ven­tional nio­bium. This ma­te­r­ial is formed by va­por­iz­ing Sn in a high tem­per­a­ture vac­uum fur­nace and let­ting the Sn ab­sorb into a Nb sub­strate to form a 2-3 um Nb3Sn layer. Cur­rent Nb3Sn cav­i­ties pro­duced at Cor­nell achieve Q ~ 1010 at 4.2 K and 17 MV/m. Here we pre­sent a sum­mary of the cur­rent per­for­mance of Nb3Sn cav­i­ties at Cor­nell and re­cent progress in im­prov­ing the ac­cel­er­at­ing gra­di­ent.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO055  
About • paper received ※ 20 September 2018       paper accepted ※ 21 September 2018       issue date ※ 18 January 2019  
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TUPO057 Low-temperature Baking and Infusion Studies for High-gradient ILC SRF Cavities 466
 
  • M. Ge, P.N. Koufalis, G. Kulina, M. Liepe, J.T. Maniscalco
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  Low-tem­per­a­ture in­fu­sion has be­come a hot-topic in SRF re­searches re­cently. Past re­sults show that low-tem­per­a­ture in­fu­sion can pro­duce high qual­ity fac­tor at medium ac­cel­er­at­ing fields. Also, 75°C bak­ing re­cently has been shown to im­prove ac­cel­er­at­ing gra­di­ents of SRF cav­i­ties. Hence these treat­ments are very promis­ing for re­duc­ing cost of the ILC. In this work, we pre­sent lat­est re­sults of low tem­per­a­ture in­fu­sion and bak­ing, show­ing that these treat­ments can im­prove SRF cav­i­ties per­for­mance.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO057  
About • paper received ※ 19 September 2018       paper accepted ※ 20 September 2018       issue date ※ 18 January 2019  
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