1. PHOENIX 28 GHz / 1 KW / 15 ms UHF at 4 Hz
( F 6mm /20 KV/ monogap/ Argon gas)
« Pre-glow » of Ar during 1 ms
At the beginning of a 15 ms UHF bunch
Spectre at t=400 µs
Ar8+
Ar8+ = f(t)
400 µs rising time of Ar8+

2. u.a. Low pressure Discharge i.e. low density without MCI Pre glow
with MCI
H +
H2 +
Ar 9+
Ar 8+
Ar 4+
Ar 2+

3. It depends of the initial pressure
Comments of Thomas Thuillier, March 27th 2001 on the logbook of PHOENIX 28 GHz
Dp ~ a factor two
It depends of the initial pressure
the duty cycle and the extraction hole
Of course 20mAe/20KV/monogap