Berlin 2012 – scientific programme

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 3: Vacuum Systems and Tools

VA 3.2: Talk

Monday, March 26, 2012, 15:00–15:20, HFT-FT 131

Vacuum system design of the MITICA Test Facility - Challenges for the cryopump — •Santiago Ochoa, Stefan Hanke, and Christian Day — Karlsruhe Institut of Technology KIT, Institute for Technical Physics ITEP, D-76344 Eggenstein-Leopoldshafen, Germany

MITICA (Megavolt ITER Injector and Concept Advancement) is a testbed for the full-sized heating neutral beam injector currently being built in Europe and will start operation more than five years before the heating beam system will be used on the nuclear fusion device ITER.

In order for this neutral beam injector to heat the plasma properly a high ion fraction with small divergence has to be delivered and the demanding pressure profile along the beam line has to be achieved.

The vacuum system should overcome several challenges as the space available is limited, the pumping speeds needed are extraordinarily high, and strong temperature differences have to be considered in the design. A wrong design would lead to an insufficient pump performance, therefore to a higher pressure and consequently to problems as charge exchanges, voltage breakdowns or even back scattering of the beam.

In this work, it will be presented an overview of the requirements for the correct operation of the MITICA testbed, their classification in two groups: vacuum requirements and additional requirements for the specific case MITICA. Finally, it is shown how the vacuum system, designed by the Vacuum Group of the ITEP (KIT), accomplished them.