IPAC'10 - List of Authors (Ike, R.C.)

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Ike, R.C.

Paper	Title	Page
WEPEC081	Study of Low Temperature Baking Effect on Field Emission on Nb Samples Treated by BEP, EP, and BCP	3067
	A.T. Wu, R.C. Ike, S. Jin, R.A. Rimmer JLAB, Newport News, Virginia X.Y. Lu, K. Zhao PKU/IHIP, Beijing L.C. Macintyre NSU, Newport News, Virginia
	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. * L.C. MacIntyre, R. Ike, and A.T. Wu, 2005, unpublished

Paper

Title

Page

WEPEC081

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

3067

A.T. Wu, R.C. Ike, S. Jin, R.A. Rimmer
JLAB, Newport News, Virginia
X.Y. Lu, K. Zhao
PKU/IHIP, Beijing
L.C. Macintyre
NSU, Newport News, Virginia

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.

* L.C. MacIntyre, R. Ike, and A.T. Wu, 2005, unpublished