Year : 2013, Volume : 38, Issue : 1to4
First page : ( 98) Last page : ( 103)
Print ISSN : 0379-0479. Online ISSN : 2349-2120. Published online : 2013  3.

Experimental investigation and analysis on radiation cooling of cavities in cryomodule for superconducting linac accelerator

Datta T S¹, Kar S.¹, Chacko J.¹, Choudhury A.¹, Antony J.¹, Babu S.¹, Kumar M.¹

¹Inter University Accelerator Centre. New Delhi

Abstract

First phase of superconducting linac booster at IUAC with one linac cryomodule along with buncher and rebuncher was developed earlier and tested successfully. Recently another two linac cryomodules are added to complete the booster project. In each cryomodule, the cold mass at 4.2 K consists of cavities, liquid helium vessel and support structure is surrounded by the liquid nitrogen cooled thermal shield maintained at 100 K. Three stages of cooling namely, radiation cooling followed by liquid nitrogen pre-cooling and finally liquid helium cooling, are followed to reduce the temperature of cold mass from 300 K to 4.2 K. The temperature of cavity and helium vessel reaches to 220 K in 40 hours of time by the natural radiation from the thermal shield. Theoretical calculation on cooling rate and temperature profile for each component of cold mass is presented here along with measured data. Performance comparison with new modules is also discussed in this paper

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Keywords

Cryomodule, Cavity, Radiation, Thermal shield.

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