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VA: Fachverband Vakuumphysik und Vakuumtechnik
VA 1: ITER - The new international fusion reactor
VA 1.3: Talk
Monday, March 23, 2009, 11:30–11:50, HSZ 101
The Novel Cryopump for the Neutral Beam Injection Systems of ITER — •Stefan Hanke, Christian Day, and Matthias Dremel — Institut für Technische Physik, Forschungszentrum Karlsruhe GmbH, Postfach 3640, 76021 Karlsruhe
The Neutral Beam Injection Systems (NBI) for ITER induce extraordinary high demands on the supporting vacuum system. The Beam Line Components of the NBI are considerable sources of gas and thermal radiation.
A cryopump design was developed to fulfil the two main operational tasks: a pumping speed of several 103 m3/s and high gas loads of protium and deuterium to be pumped. The design was driven by two competing requirements: The high thermal heat loads ask for a closed pump, the need of a high pumping speed ask for an open structure. To combine both objectives in an optimized geometry the Test Particle Monte Carlo code MOVAK 3D was used.
The talk will give an overview of the NBI, the implications for the vacuum system, the approaches to solve and optimize various aspects and the resulting features of the actual cryopump design.