Introduction

Aims

Possible objectives:

• Investigation of RE generation mechanisms.

• Investigation of RE mitigation mechanisms (Working gas, mitigation during shot termination ( prepare in advance ) )

• Plasma resistivity as \(f:REs \rightarrow \sigma\) (does \(kT^{-3/2}\) holds?) (\(j\leq n \cdot e \cdot c\))

• High vs low energy REs (REs popullation vs energy)

Aparatus

Possible diagnostics:

1. Scintillation detector plus photo-multiplier (NaI(Tl), YAP(Ce)). Hits / deposited energy.

2. PH32-based detector (Strip detector).

3. Timepix (SXR + HXR? Timepix(3?) CdTe?)

4. Dosimeters

5. Cherenkov Detector?

6. Spectrometer(s)

Possible parameters:

1. Pressure (keep low)

2. Electric field

3. B field

4. Working gas ( after n shots, maybe after glow discharge session )

5. Stabilization System (sudden field variations may lead to enhancement of RE population).

Methodology

Functional areas:

• Background plasma characterization by means of electrostatic probes.

• Plasma column stabilization system.

• RE count and energy distribution measurements.

• Working gas manipulation.

Session schedule:

1. Reference shot on H2.

2. Up to two shots with different conditions, still on H2.

3. Chamber conditioning from H2 to Ar.

4. Up to two shots with similar conditions as 2 but for Ar.