Design of a diagnostic residual gas analyzer for the ITER divertor

Conference · Thu Jan 01 00:00:00 EST 2015

OSTI ID:1185698

Klepper, C Christopher ^[1]; Biewer, T. M. ^[2]; Graves, Van B ^[1]; Andrew, P. ^[3]; Lukens, P. C. ^[4]; Marcus, Chris ^[1]; Shimada, M. ^[5]; Hughes, S. ^[6]; Boussier, B. ^[5]; Johnson, D. W. ^[7]; Gardner, W. L. ^[4]; Hillis, D. L. ^[2]; Vayakis, G. ^[6]; Vayakis, G. ^[5]; Walsh, M. ^[5]

---

1. ORNL
2. Oak Ridge National Laboratory (ORNL)
3. EURATOM / UKAEA, UK
4. United States ITER Project Office
5. ITER Organization, Saint Paul Lez Durance, France
6. ITER Organization, Cadarache, France
7. Princeton Plasma Physics Laboratory (PPPL)

One of the ITER diagnostics having reached an advanced design stage is a diagnostic RGA for the divertor, i.e. residual gas analysis system for the ITER divertor, which is intended to sample the divertor pumping duct region during the plasma pulse and to have a response time compatible with plasma particle and impurity lifetimes in the divertor region. Main emphasis is placed on helium (He) concentration in the ducts, as well as the relative concentration between the hydrogen isotopes (H2, D2, T2). Measurement of the concentration of radiative gases, such as neon (Ne) and nitrogen (N2), is also intended. Numerical modeling of the gas flow from the sampled region to the cluster of analysis sensors, through a long (~8m long, ~110mm diameter) sampling pipe terminating in a pressure reducing orifice, confirm that the desired response time (~1s for He or D2) is achieved with the present design.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1185698
• Resource Relation: Conference: SOFT 14, San Sebasti n, Spain, 20140929, 20141003
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY