The gas supply and gas inlet control systems of the fusion experiment Wendelstein 7-X

Abstract

After a detailed commissioning process the fusion experiment Wendelstein 7-X (W7-X) was ready to operate in December 2015. The gas supply system and the gas inlet system are two important technical systems of the W7-X device, offering a wide spectrum of functions for plasma vessel conditioning, and plasma operation as well as for diagnostic and calibration purposes. A brief overview is given of the structure of both gas supply and gas inlet systems. The design of the control systems of the gas supply and the gas inlet are introduced and described. The application of the W7-X gas inlet system is explained during an experiment discharge.

The evolution of the bound particle reservoir in Wendelstein 7-X and its influence on plasma control

“…The particle sources comprise all external particle sources, such as gas valves, pellet injectors, diagnostic and heating particle beams as well as leaks. In W7-X there is a main fueling valve system [29], a divertor gas inlet system [30], a frozen pellet injector [31,32], an impurity pellet injector [33], an impurity laser sputtering device [34] and a NBI system [35] as particle sources.…”

Uragan-2m Gas Mixing System

“…Gas puffing and gas mixing system [1 -3] is a main part of a fusion device. Wendelstein 7-X (W7-X) gas supply system provides required gases and gas mixtures for all gas consumers (gas puffing system, diagnostics, technical components) during all working stages [1,3]. Gas input should work both with short plasma discharges that lasting several seconds and with long impulses that reach 30 min because of different scheduled W7-X regimes.…”