Neutral pressure studies with a fast ionization gauge in the divertor region of the DIII-D tokamak

C. C. Klepper; T. E. Evans; G. Haas; G. L. Jackson; R. Maingi

doi:10.1116/1.578751

Neutral pressure studies with a fast ionization gauge in the divertor region of the DIII-D tokamak

C. C. Klepper, T. E. Evans, G. Haas, G. L. Jackson, R. Maingi

Diagnostics and Control

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Abstract

An ionization gauge, specially designed to operate in the high magnetic fields of present-day tokamaks (1–6 T) and with electronics designed for fast time response and high noise rejection, was installed and operated in the new pumping plenum in the divertor region of DIII-D. This plenum, formed by a toroidally symmetric baffle, is used to compress neutrals to high pressures (> 1 mTorr) to allow for high particle removal rates when a pump is added inside the plenum. Pressures of 2–20 mTorr were measured with the fast gauge under the baffle, compared to less than 1 mTorr measured by a similar gauge also installed in the divertor but outside the baffle. A detailed description of the fast gauge, its operation, and its calibration is provided.

Original language	English
Pages (from-to)	446-450
Number of pages	5
Journal	Journal of Vacuum Science and Technology, Part A: Vacuum, Surfaces and Films
Volume	11
Issue number	2
DOIs	https://doi.org/10.1116/1.578751
State	Published - Mar 1993

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abstract = "An ionization gauge, specially designed to operate in the high magnetic fields of present-day tokamaks (1–6 T) and with electronics designed for fast time response and high noise rejection, was installed and operated in the new pumping plenum in the divertor region of DIII-D. This plenum, formed by a toroidally symmetric baffle, is used to compress neutrals to high pressures (> 1 mTorr) to allow for high particle removal rates when a pump is added inside the plenum. Pressures of 2–20 mTorr were measured with the fast gauge under the baffle, compared to less than 1 mTorr measured by a similar gauge also installed in the divertor but outside the baffle. A detailed description of the fast gauge, its operation, and its calibration is provided.",

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AU - Evans, T. E.

AU - Haas, G.

AU - Jackson, G. L.

AU - Maingi, R.

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AB - An ionization gauge, specially designed to operate in the high magnetic fields of present-day tokamaks (1–6 T) and with electronics designed for fast time response and high noise rejection, was installed and operated in the new pumping plenum in the divertor region of DIII-D. This plenum, formed by a toroidally symmetric baffle, is used to compress neutrals to high pressures (> 1 mTorr) to allow for high particle removal rates when a pump is added inside the plenum. Pressures of 2–20 mTorr were measured with the fast gauge under the baffle, compared to less than 1 mTorr measured by a similar gauge also installed in the divertor but outside the baffle. A detailed description of the fast gauge, its operation, and its calibration is provided.

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Neutral pressure studies with a fast ionization gauge in the divertor region of the DIII-D tokamak

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