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Numerical simulation and experiment of error field measurement using luminous trace of electron beam in SST-1

Plasma Science and Technology 2019年第10期21卷 9-16页

作者： Someswar DUTTA y paravastu J DHONGDE H CHUDASMA S GEORGE K DHANANI A MAKWANA C DODIyA P VARMORA D K SHARMA A K SINGH U KUMAR D RAVAL U PRASAD Z KHAN R SRINIVASAN D RAJU Institute for Plasma Research GandhinagarGujrat 382428India Homi Bhabha National Institute (HBNI) AnushaktinagarMumbai 400094India

In contrast to the earlier experiments conducted in other machines, here, in SST-1 the error field measurement experiment is performed with a filled gas pressure ~8×10^-4 mbar which helped to create a luminescent toroidal beam of electron path originated due to impact excitation and guided by the toroidal magnetic field. Beam path deviations are observed and recorded from radial and top ports using visible range cameras. Such creation and detection of the electron beam path differs from the earlier works where the gun emitted electron beam deviation in ultrahigh vacuum was detected on a collector-grid/fluorescent screen. In the present experiment, large beam deviations were observed. Later investigation of the experimental set-up reveals existence of a possible source of radial electric field in between the source and the vacuum vessel which are separately grounded. Thus, to understand the observed phenomena, experiments are numerically modeled with deviated TF coil set, PF coil set and the electron source location. A particle tracing code is used to follow the electron path in the magnetic field generated by the coil set of interest. Simulation results suggest that the large deviation corresponds to the E×B drifts and not due to the large field errors. Toroidally averaged field errors of the SST-1 TF coils at toroidal field of B0?=?15 kG are negligibly small ~B0?×?10^-6 or less, which should not adversely affect the plasma performance.

关键词： electron beam error field SST-1 TF coil

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Nitrogen Gas Heating and Supply System for SST-1 Tokamak

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Plasma Science and Technology 2013年第2期15卷 157-160页

作者： Ziauddin KHAN Firozkhan PATHAN yuvakiran paravastu Siju GEORGE Gattu RAMESH Hima BINDU Dilip C. RAVAL Prashant THANKEy KalpeshDHANANI Subrata PRADHAN Institute for Plasma Research Bhat Gandhinagar-382 428 India

Steady State Tokamak （SST-1） vacuum vessel baking as well as baking of the first wall components of SST-1 are essential to plasma physics experiments. Under a refurbishment spectrum of SST-1, the nitrogen gas heating and supply system has been fully refurbished. The SST-1 vacuum vessel consists of ultra-high vacuum （UHV） compatible eight modules and eight sectors. Rectangular baking channels are embedded on each of them. Similarly, the SST-1 plasma facing components （PFC） are comprised of modular graphite diverters and movable graphite based limiters. The nitrogen gas heating and supply system would bake the plasma facing components at 350 ~C and the SST-1 vacuum vessel at 150 ~C over an extended duration so as to remove water vapour and other absorbed gases. An efficient PLC based baking facility has been developed and implemented for monitoring and control purposes. This paper presents functional and operational aspects of a SST-1 nitrogen gas heating and supply system. Some of the experimental results obtained during the baking of SST-1 vacuum modules and sectors are also presented here.

关键词： SST-1 heating and supply system graphite based limiters PFC

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