Study of Low Temperature Baking Effect on Field Emission on Nb Samples Treated by BEP, EP, and BCP

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Field emission is still one of the major obstacles facing Nb superconducting radio frequency (SRF) community for allowing Nb SRF cavities to reach routinely accelerating gradient of 35 MV/m that is required for the international linear collider. Nowadays, the well know low temperature backing at 120 oC for 48 hours is a common procedure used in the SRF community to improve the high field Q slope. However, some cavity production data have showed that the low temperature baking may induce field emission for cavities treated by EP. On the other hand, an earlier study of field emission on Nb flat ... continued below

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Andy Wu, Song Jin, Robert Rimmer, Xiang Yang Lu, K. Zhao, Laura MacIntyre, Robert Ike May 1, 2010.

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Field emission is still one of the major obstacles facing Nb superconducting radio frequency (SRF) community for allowing Nb SRF cavities to reach routinely accelerating gradient of 35 MV/m that is required for the international linear collider. Nowadays, the well know low temperature backing at 120 oC for 48 hours is a common procedure used in the SRF community to improve the high field Q slope. However, some cavity production data have showed that the low temperature baking may induce field emission for cavities treated by EP. On the other hand, an earlier study of field emission on Nb flat samples treated by BCP showed an opposite conclusion. In this presentation, the preliminary measurements of Nb flat samples treated by BEP, EP, and BCP via our unique home-made scanning field emission microscope before and after the low temperature baking are reported. Some correlations between surface smoothness and the number of the observed field emitters were found. The observed experimental results can be understood, at least partially, by a simple model that involves the change of the thickness of the pent-oxide layer on Nb surfaces.

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  • IPAC'10, 23-28 May 2010, Kyoto, Japan

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  • Report No.: JLAB-ACC-11-1378
  • Report No.: DOE/OR/23177-1598
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1020710
  • Archival Resource Key: ark:/67531/metadc831239

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  • May 1, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:04 p.m.

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Andy Wu, Song Jin, Robert Rimmer, Xiang Yang Lu, K. Zhao, Laura MacIntyre, Robert Ike. Study of Low Temperature Baking Effect on Field Emission on Nb Samples Treated by BEP, EP, and BCP, article, May 1, 2010; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc831239/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.