Abstract
The cooling system of the proposed TESLA 500 superconducting linac makes extensive use of He II two-phase flow. However, there remain a number of open questions about the expected performance of this unique two-phase flow system. One of the purposes of the TESLA Test Facility (TTF) currently under construction at DESY, is to test the planned cryogenic cooling system for TESLA 500. Towards this end, sensors will be installed in TTF to verify the stability and structure of the two-phase flow regime, and measure the vapour velocity, temperature and slip. These measurements will assist in predicting the performance of the TESLA cooling system as well as providing information on the basic behaviour of He II two-phase flow. These sensors include ones installed by DESY staff as well as an experiment designed and built by the National High Magnetic Field Laboratory in Tallahassee, FL, USA. This paper describes the proposed cooling system for TESLA 500 and its predicted performance. In addition, experiments designed to understand the behaviour of the He II two-phase flow system are described.
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