Introduction

RE Studies

Paschen Law

Aims

Possible objectives:

• Investigation of RE on H2 and Ar.

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 (\(5\ mPa < P \leq 10\ mPa\), \(14\ mPa\)).

2. Electric field, keep low for low Plasma current (\(440 \geq E\ V\), \(325\ V\)).

3. B field (\(\sim 1300\ V\), \(1200\ V\)).

4. Working gas (H2, Ar or He).

5. Stabilization System.

Reference shots: 29398 27762 27738 27745 27751 27756 27757 29364 31052

Methodology

Functional areas:

• Background plasma characterization by means of electrostatic probes.

• Plasma column stabilization system.

• RE count and energy distribution measurements.

• Working gas manipulation.

Functional areas:

• Background plasma characterization by means of electrostatic probes.

• Plasma column stabilization system.

• RE count and energy distribution measurements.

• Working gas manipulation.

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. Several shots with different conditions, still on H2.

3. Chamber conditioning from H2 to Ar.

4. Several shots with similar conditions as 2 but for Ar.