SRF Cryomodule Development at NSCL

SRF cavities operate in a cryogenic environment at temperatures between 2 K and 4.5 K. Typically several cavities are placed in one common cryostat, known as a cryomodule. A number of cryomodules would be require for an accelerator such as the Rare Isotope Accelerator. Cryomodules are being developed at NSCL for elliptical cavities, half-wave resonators, and quarter-wave resonators. This work is being carried out in collaboration with with Jefferson Laboratory and INFN Legnaro.

Cryomodule for Multi-Cell Elliptical Cavities

A two-cavity prototype cryomodule was designed and fabricated at NSCL, in collaboration with Jefferson Laboratory. RF testing of the cryomodule was done in 2004. Studies of microphonics and RF control are in progress.

Top left: six-cell 805 MHz elliptical cavities being assembled in the clean room.  Bottom left: assembly of inner mu-metal shield.  Top right: assembly of thermal shield.  Bottom right: completed 2-cavity cryomodule.

Cryomodule for Half-Wave and Quarter-Wave Resonators

NSCL has designed a prototype cryomodule to house a quarter-wave resonator, a half-wave resonator, and two superconducting magnets, in collaboration with INFN Legnaro. The cavities and magnets have been fabricated and tested in a vertical Dewar. Fabrication of the prototype cryomodule is in progress.

		Top left: cavities and magnets being assembled in the clean room.  Bottom left: test fitting of the thermal shield.  Top right: assembly of cold mass onto top plate.  Bottom right: partially assembled cold box.

Related Papers

2005

M. Johnson, J. Bierwagen, S. Bricker, C. Compton, P. Glennon, T. L. Grimm, W. Hartung, D. Harvell, A. Moblo, J. Popielarski, L. Saxton, R. C. York, A. Zeller, “Cryomodule Design for a Superconducting Linac with Quarter-Wave, Half-Wave and Focusing Elements,” in Proceedings of the 2005 Particle Accelerator Conference, C. Horak, Editor, IEEE Publishing, Piscataway, New Jersey, 2005, p. 4317-4319.  PDF (JACoW)

2004

T. L. Grimm, S. Bricker, C. Compton, W. Hartung, M. Johnson, F. Marti, J. Popielarski, R. C. York, G. Ciovati, P. Kneisel, L. Turlington, “Experimental Study of an 805 MHz Cryomodule for the Rare Isotope Accelerator,” in Proceedings of Linac 2004: XXII International Linear Accelerator Conference: Lübeck, Germany, p. 773-775.  PDF (JACoW) PDF (preprint)

2003

T. L. Grimm, V. Andreev, D. Gorelov, W. Hartung, F. Marti, S. Schriber, X. Wu, R. C. York, Q. Zhao, P. Kneisel, G. Ciovati, L. Turlington, “805 MHz beta = 0.47 Elliptical Accelerating Structure R&D,” presented at the Rare Isotope Accelerator R & D Workshop, Bethesda, Maryland, 26-28 August 2003, Paper 2.2.3.  PDF (RIA SEB Web site)

T. L. Grimm, V. Andreev, D. Gorelov, W. Hartung, F. Marti, S. Schriber, X. Wu, R. C. York, Q. Zhao, A. Facco, V. Zviagintsev, “Alternative Superconducting Drift Tube Linac R&D,” presented at the Rare Isotope Accelerator R & D Workshop, Bethesda, Maryland, 26-28 August 2003, Paper 2.2.4.  PDF (RIA SEB Web site)

T. L. Grimm, W. Hartung, M. Johnson, R. C. York, P. Kneisel, L. Turlington, “Cryomodule Design for the Rare Isotope Accelerator,” in Proceedings of the 2003 Particle Accelerator Conference, Joe Chew, Peter Lucas, & Sara Webber, Editors, IEEE Publishing, Piscataway, New Jersey, 2003, p. 1350-1352.  PDF (JACoW)