Fast Neutral Pressure Gauges in NSTX | Zendy

R. Raman | Zendy; H.W. Kugel | Zendy; Robert Gernhardt | Zendy; T. Provost | Zendy; T. R. Jarboe | Zendy; V. Soukhanovskii | Zendy

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Fast Neutral Pressure Gauges in NSTX

Author(s) -

R. Raman,

H.W. Kugel,

Robert Gernhardt,

T. Provost,

T. R. Jarboe,

V. Soukhanovskii

Publication year - 2004

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/827840

Subject(s) - divertor , toroidal and poloidal , toroid , enhanced data rates for gsm evolution , gauge (firearms) , plasma , physics , pressure measurement , magnetic field , nuclear engineering , atomic physics , toroidal field , ionization , ion , tokamak , electrical engineering , materials science , nuclear physics , engineering , telecommunications , quantum mechanics , meteorology , metallurgy

Successful operation in NSTX of two prototype fast-response micro ionization gauges during plasma operations has motivated us to install five gauges at different toroidal and poloidal locations to measure the edge neutral pressure and its dependence on the type of discharge (L-mode, H-mode, CHI) and the fueling method and location. The edge neutral pressure is also used as an input to the transport analysis codes TRANSP and DEGAS-2. The modified PDX-type Penning gauges are well suited for pressure measurements in the NSTX divertor where the toroidal field is relatively high. Behind the NSTX outer divertor plates where the field is lower, an unshielded fast ion gauge of a new design has been installed. This gauge was developed after laboratory testing of several different designs in a vacuum chamber with applied magnetic fields

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