Diamond-coated probe head for measurements in the deep SOL and beyond

R. Schrittwieser; G. S. Xu; Ning Yan; Jens Juul Rasmussen; P. Schrittwieser; D. Steinmüller-Nethl; F. Mehlmann; C. Ionita

Diamond-coated probe head for measurements in the deep SOL and beyond

R. Schrittwieser, G. S. Xu, Ning Yan, Jens Juul Rasmussen, P. Schrittwieser, D. Steinmüller-Nethl, F. Mehlmann, C. Ionita

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Abstract

We have tested two cylindrical graphite probe heads coated by a layer of electrically isolating UNCD (Ultra Nano-Crystalline Diamond) using a CVD (Chemical Vapour Deposition) method. The probe heads were mounted on the reciprocating probe manipulator of the Experimental Advanced Superconducting Tokamak (EAST) in Hefei, People's Republic of China. Transport parameters, plasma density, temperature, potential, as well as toroidal rotation near the separatrix were determined up to a distance of 15 mm inside the LCFS in high confinement regimes. A very important result was that the UNCD coating could also prevent the sputtering of graphite from the probe head and the subsequent coating of the BN isolation between probe pins and probe head by a layer of conductive graphite almost completely.

Original language	English
Publication date	2013
Number of pages	4
Publication status	Published - 2013
Event	40th European Physical Society Conference on Plasma Physics - Espoo, Finland Duration: 1 Jul 2013 → 5 Jul 2013 Conference number: 40 http://eps2013.aalto.fi/

Conference

Conference	40th European Physical Society Conference on Plasma Physics
Number	40
Country/Territory	Finland
City	Espoo
Period	01/07/2013 → 05/07/2013
Internet address	http://eps2013.aalto.fi/

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title = "Diamond-coated probe head for measurements in the deep SOL and beyond",

abstract = "We have tested two cylindrical graphite probe heads coated by a layer of electrically isolating UNCD (Ultra Nano-Crystalline Diamond) using a CVD (Chemical Vapour Deposition) method. The probe heads were mounted on the reciprocating probe manipulator of the Experimental Advanced Superconducting Tokamak (EAST) in Hefei, People's Republic of China. Transport parameters, plasma density, temperature, potential, as well as toroidal rotation near the separatrix were determined up to a distance of 15 mm inside the LCFS in high confinement regimes. A very important result was that the UNCD coating could also prevent the sputtering of graphite from the probe head and the subsequent coating of the BN isolation between probe pins and probe head by a layer of conductive graphite almost completely.",

author = "R. Schrittwieser and Xu, {G. S.} and Ning Yan and {Juul Rasmussen}, Jens and P. Schrittwieser and D. Steinm{\"u}ller-Nethl and F. Mehlmann and C. Ionita",

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T1 - Diamond-coated probe head for measurements in the deep SOL and beyond

AU - Schrittwieser, R.

AU - Xu, G. S.

AU - Yan, Ning

AU - Juul Rasmussen, Jens

AU - Schrittwieser, P.

AU - Steinmüller-Nethl, D.

AU - Mehlmann, F.

AU - Ionita, C.

N1 - Conference code: 40

PY - 2013

Y1 - 2013

N2 - We have tested two cylindrical graphite probe heads coated by a layer of electrically isolating UNCD (Ultra Nano-Crystalline Diamond) using a CVD (Chemical Vapour Deposition) method. The probe heads were mounted on the reciprocating probe manipulator of the Experimental Advanced Superconducting Tokamak (EAST) in Hefei, People's Republic of China. Transport parameters, plasma density, temperature, potential, as well as toroidal rotation near the separatrix were determined up to a distance of 15 mm inside the LCFS in high confinement regimes. A very important result was that the UNCD coating could also prevent the sputtering of graphite from the probe head and the subsequent coating of the BN isolation between probe pins and probe head by a layer of conductive graphite almost completely.

AB - We have tested two cylindrical graphite probe heads coated by a layer of electrically isolating UNCD (Ultra Nano-Crystalline Diamond) using a CVD (Chemical Vapour Deposition) method. The probe heads were mounted on the reciprocating probe manipulator of the Experimental Advanced Superconducting Tokamak (EAST) in Hefei, People's Republic of China. Transport parameters, plasma density, temperature, potential, as well as toroidal rotation near the separatrix were determined up to a distance of 15 mm inside the LCFS in high confinement regimes. A very important result was that the UNCD coating could also prevent the sputtering of graphite from the probe head and the subsequent coating of the BN isolation between probe pins and probe head by a layer of conductive graphite almost completely.

M3 - Paper

T2 - 40th European Physical Society Conference on Plasma Physics

Y2 - 1 July 2013 through 5 July 2013

ER -

Diamond-coated probe head for measurements in the deep SOL and beyond

Abstract

Conference

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