SRF2011 - List of Authors (Xie, Y.)

Paper	Title	Page
MOPO042	Coupler Design for a Sample Host TE Cavity	184
	Y. Xie, M. Liepe CLASSE, Ithaca, New York, USA
	Funding: Work supported by NSF and Alfred P. Sloan Foundation. A sample host niobium superconducting cavity operating at both TE012 and TE013 modes has been developed . The cavity features a flat 3.75'' diameter demountable bottom plate allowing RF testing of new materials such as Nb3Sn and MgB2. Since the surface resistance of the sample plates may vary a lot, an adjustable input coupler has been developed for this cavity. A hook shape coupler tip is designed and optimized to couple to the magnetic field of both transverse electric modes. The external Q factor, coupler heating considerations and 3D multipacting simulations using ACE3P will be discussed. Y. Xie, J. Hinnefield, M. Liepe, '' Design of a TE-type cavity for testing superconducting material samples'', SRF2009, Berlin (2009)

THPO001	Quench Simulation Using a Ring-Type Defect Model	687
	Y. Xie, M. Liepe, H. Padamsee CLASSE, Ithaca, New York, USA
	Funding: Work supported by NSF and Alfred P. Sloan Foundation. A 2 dimensional ring-type defect thermal feedback model has been improved by including magnetic field enhancement at the pit edge. Latest simulation results show that there is a thermally stable state below the quench field with part of edge becoming normal conducting, which can explain pre-heating phenomenon observed in thermometry measurements. 3D magnetic field enhancement calculations of pit structures using Omega3P shows angular non-uniform field enhancement around the edge. Those findings will be incorporated into a 3D finite ring-type defect thermal codes.

THPO050	TE Sample Host Cavities Development at Cornell	841
	Y. Xie, M. Liepe CLASSE, Ithaca, New York, USA
	Funding: Work supported by NSF and Alfred P. Sloan Foundation In order to measure surface resistance of new materials other than niobium such as Nb3Sn and MgB2, two sample host niobium cavities operating at TE modes have been developed at Cornell University. The first one is a 6GHz pillbox TE011 cavity modified from an older vision enabling testing 2.75'' diameter flat sample plates . The second one is an optimized mushroom-shape niobium cavity operating at both 4GHz TE012 and 6GHz TE013 modes for 3.75'' diameter flat sample plates . First results from the commissioning of the two TE cavities will be reported. D. Rubin et al., Phys. Rev. B 38, 6538(1988) ** Y. Xie, J. Hinnefield, M. Liepe, '' Design of a TE-type cavity for testing superconducting material samples'', SRF2009, Berlin (2009)

Paper

Title

Page

Coupler Design for a Sample Host TE Cavity

184

Y. Xie, M. Liepe
CLASSE, Ithaca, New York, USA

Funding: Work supported by NSF and Alfred P. Sloan Foundation.
A sample host niobium superconducting cavity operating at both TE012 and TE013 modes has been developed *. The cavity features a flat 3.75'' diameter demountable bottom plate allowing RF testing of new materials such as Nb3Sn and MgB2. Since the surface resistance of the sample plates may vary a lot, an adjustable input coupler has been developed for this cavity. A hook shape coupler tip is designed and optimized to couple to the magnetic field of both transverse electric modes. The external Q factor, coupler heating considerations and 3D multipacting simulations using ACE3P will be discussed.
* Y. Xie, J. Hinnefield, M. Liepe, '' Design of a TE-type cavity for testing superconducting material samples'', SRF2009, Berlin (2009)

THPO001

Quench Simulation Using a Ring-Type Defect Model

687

Y. Xie, M. Liepe, H. Padamsee
CLASSE, Ithaca, New York, USA

Funding: Work supported by NSF and Alfred P. Sloan Foundation.
A 2 dimensional ring-type defect thermal feedback model has been improved by including magnetic field enhancement at the pit edge. Latest simulation results show that there is a thermally stable state below the quench field with part of edge becoming normal conducting, which can explain pre-heating phenomenon observed in thermometry measurements. 3D magnetic field enhancement calculations of pit structures using Omega3P shows angular non-uniform field enhancement around the edge. Those findings will be incorporated into a 3D finite ring-type defect thermal codes.

THPO050

TE Sample Host Cavities Development at Cornell

841

Y. Xie, M. Liepe
CLASSE, Ithaca, New York, USA

Funding: Work supported by NSF and Alfred P. Sloan Foundation
In order to measure surface resistance of new materials other than niobium such as Nb3Sn and MgB2, two sample host niobium cavities operating at TE modes have been developed at Cornell University. The first one is a 6GHz pillbox TE011 cavity modified from an older vision enabling testing 2.75'' diameter flat sample plates *. The second one is an optimized mushroom-shape niobium cavity operating at both 4GHz TE012 and 6GHz TE013 modes for 3.75'' diameter flat sample plates **. First results from the commissioning of the two TE cavities will be reported.
* D. Rubin et al., Phys. Rev. B 38, 6538(1988)
** Y. Xie, J. Hinnefield, M. Liepe, '' Design of a TE-type cavity for testing superconducting material samples'', SRF2009, Berlin (2009)