Abstract
We present a new diagnostic tool for the determination of various plasma parameters in the edge region of medium-size tokamaks (MST) and stellarators (specifically Wendelstein 7-X) which is under development under the EUROfusion project task force MST2 and S1. This will be a probe head (called the new probe head-NPH) which will carry two cold Langmuir probes, one electron-emissive probe (EEP), two retarding field analysers (RFA) facing upstream and downstream and two magnetic pickup coils. By various adaptors, the same NPH will be used on all three European MSTs (ASDEX Upgrade, TCV and MAST-U) and on Wendelstein 7-X. For the first time the plasma potential in the edge region of MSTs and comparable toroidal fusion experiments will be directly determined by an EEP that will be permanently heated during the measurements. After the introduction and the theoretical background especially of the EEP, the NPH and its components are described in detail. The NPH will be able to measure electron and ion temperature, electron and ion density, cold floating potential, plasma potential and magnetic fluctuations in all three directions of space at two radial positions.
Highlights
We present a new diagnostic tool for the determination of various plasma parameters in the edge region of medium-size tokamaks (MST) and stellarators ( Wendelstein 7-X) which is under development under the EUROfusion project task force MST2 and S1
The same new probe head (NPH) will be used on all three European MSTs (ASDEX Upgrade, Tokamak à configuration variable (TCV) and MAST-U) and on Wendelstein 7-X
For the first time the plasma potential in the edge region of MSTs and comparable toroidal fusion experiments will be directly determined by an electronemissive probe (EEP) that will be permanently heated during the measurements
Summary
We have developed probes whose floating potential is close, or ideally equal to Φpl, so that this important parameter can be measured directly and with high temporal resolution [14] Such plasma potential probes (PPP) are either electron-emissive probes (EEP), operable in all types of plasma [13, 15], or electron screening probes (ESP) drawing on the difference of the gyroradii of electrons and ions in magnetic fields [12, 16, 17]. For comprehensive investigations of blobs in the edge region of toroidal magnetic fusion experiments a new probe head (NPH) has been developed which combines two CLPs, an EEP and two retarding field analysers (RFA) for ion energy distribution measurements [18,19,20]. In AUG two NPHs will be employed and operated simultaneously, one on the mid-plane manipulator (MEM—from German ‘Mittel-Ebenen-Manipulator’), and one on the X-point reciprocator (XPR)
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