Porous plug gas injection systems for studies of hydrocarbon dissociation and transport in the DIII-D tokamak

A. G. McLean; J. W. Davis; P. C. StangebyN. H. BrooksR. M. EllisA. A. HaaszD. L. RudakovW. P. WestD. G. WhyteC. P. C. Wong

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Porous plug gas injection systems for studies of hydrocarbon dissociation and transport in the DIII-D tokamak

机译：Porous plug gas injection systems for studies of hydrocarbon dissociation and transport in the DIII-D tokamak

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A probe has been designed, constructed, and successfully used to inject methane into the DIII-D lower divertor in a manner imitating natural release by chemical erosion. This porous plug injector (PPI) probe consists of a self-contained gas reservoir with an integrated pressure gauge and a 3 cm diameter porous surface through which gas is injected into the lower divertor of the tokamak. The probe is positioned flush with the divertor target surface by means of the divertor materials evaluation system. Two gas delivery systems were developed: in the first, gas flow is regulated by a remotely controlled microvalve and in the second by a fixed micro-orifice flow restrictor. Because of the large area of the porous surface through which gas is admitted, the injected hydrocarbon molecules see a local carbon surface (>90percent carbon) similar to that seen by hydrocarbons being emitted by chemical sputtering from surrounding carbon tiles. The distributed gas source also reduces the disturbance to the local plasma while providing sufficient signal for spectroscopic detection. In situ spectroscopic measurements with the PPI in DIII-D allow the direct calibration of response for measured plasma conditions from a known influx of gas.

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《Review of Scientific Instruments》 |2009年第4期|043501-1-043501-8|共8页
作者
A. G. McLean; J. W. Davis; P. C. StangebyN. H. BrooksR. M. EllisA. A. HaaszD. L. RudakovW. P. WestD. G. WhyteC. P. C. Wong;
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Institute for Aerospace Studies, University of Toronto, 4925 Dufferin St., Toronto, Ontario M3H 5T6, Canada;

General Atomics, P.O. Box 85608, San Diego, California 92121, USA;

Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USAUniversity of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, USAMIT Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;

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Porous plug gas injection systems for studies of hydrocarbon dissociation and transport in the DIII-D tokamak

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