Impact of radiation measurements on hardening of TFTR diagnostics

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Review of Scientific Instruments; (USA)

DOI:https://doi.org/10.1063/1.1141659· OSTI ID:6351102

Johnson, L C; Hill, K W; Gilbert, J D; Jassby, D ^[1]

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1. Princeton University, Plasma Physics Laboratory, Princeton, NJ (USA)

Contrary to previous plans for the preparation of diagnostic systems for D-T break-even experiments in the Tokamak Fusion Test Reactor (TFTR), it now appears that a limited {ital Q}{approximately}1 demonstration can be carried out without constructing a close-fitting igloo radiation shield around the tokamak. In order to assess the impact of D-T operation of TFTR without an igloo shield, particularly with regard to hardening of diagonstic systems, we have mapped neutron and gamma fluxes inside the test cell and test cell basement, using a variety of radiation measurements. The measurements are sufficiently detailed to resolve massive hardware components, such as neutral beams and shielded diagnostic systems, and can be used to predict local fluxes. By comparing the measurements with transport code calculations for the case of a bare tokamak, we conclude that the models have substantially overestimated fluxes both inside and outside the TFTR shield walls. It may be possible to eliminate an igloo shield, by taking credit for the shielding effectiveness of massive hardware around the tokamak. However, this will increase the need for local diagnostic shielding.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6351102
• Journal Information: Review of Scientific Instruments; (USA), Journal Name: Review of Scientific Instruments; (USA) Vol. 61:10; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
700209 -- Fusion Power Plant Technology-- Component Development & Materials Testing
HARDENING
NEUTRON FLUENCE
PHYSICAL RADIATION EFFECTS
PLASMA DIAGNOSTICS
RADIATION EFFECTS
RADIATION HARDENING
RADIATION PROTECTION
SAFETY
TFTR TOKAMAK
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS