Community Research and Development Information Service - CORDIS

Abstract

The ITER neutral beam heating and current drive system is to be equipped with a cryosorption cryopump made up of 12 panels connected in parallel, refrigerated by 4.5 K 0.4 Mpa supercritical helium. The pump is submitted to a non homogeneous flux of H(2) or D(2) molecules, and the absorbed flux varies from 3 Pa.m[-3] to 35 Pa.m[-3] .s[-1]. In the frame of the "ITER first injectior and test facility CSU-EFDA task" (TW3-THHN-IITF1), th eITER reference cryosystem and cryoplant designs have been assessed and compared to optimized designs devoted to the Neutral Beam Test Facility (NBTF). The 4.5 K cryopanel, which has a mass of about 1000 kg, must be periodically regenerated up to 90 K and occasionally to 470 K. The cooldown time after regeneration depends strongly on the refrigeration capacity. Fast regeneration and cool-down of the cryopanels are not considered a priority for th etest facility operation, and an analysis of the consequences of a limited cold power refrigerator on the cooling down time has been carried out and will be discussed. This paper presents a preliminary evaluation of the NBTF cryoplant and the associated process flow diagram.

Additional information

Authors: GRAVIL B, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);HENRY D, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);CORDIER J J, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);HEMSWORTH R, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);VAN HOUTTE D, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);DREMEL M, Forschungszentrum Karlsruhe, Association EURATOM-FZK, Institut fur Hochleistungsimpuls- und Mikrowellentechnik, Karlsruhe (DE)
Bibliographic Reference: An oral paper given at: 20th International Cryogenic Engineering Conference Organised by: Center for International Scientific Exchanges, Beijing (CN) Held at: Beijing Friendship Hotel, Beijing (CN)
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
Record Number: 200417526 / Last updated on: 2004-06-11
Category: PUBLICATION
Original language: en
Available languages: en