Argon at JYFL

Results with HIISI

Mixing gas: Oxygen

(1)Tuning 28.6.2018

Same as (2) with following deviations: BD: -60 V, decreased argon and oxygen feed, decreased current in mid coil, increased injection B-field. 

Acceleration voltage 18 kV/3.6 mA (HIISI extraction system). Plasma electrode aperture 8 mm in diameter.

(2) Tuning 27.6.2018 (test with recently assembled 36 segment hexapole). Background pressure in injection still quite high (1.5E-7 mbar).

Microwave power: 2000 W + 500 W from 18 GHz + 14 GHz klystrons.  Fast tuning on Ar¹²⁺ at 19 kV. Intensity gradually increased when Ar feed was increased. At the total current of around 6 mA a strong spark appeared which destroyed at least puller HV power supply. I didn't have time to measure Ar¹³⁺ but spectrum indicates that it is about 330 µA or slightly more.

(3) Tuning 31.5.2018 about 10 % lower B-fields, 1 kW + 0.4 kW µw power

Acceleration voltage 16 kV/4 mA

Material consumption: N/A

Note: Tuning for Ar⁸⁺, Ar¹²⁺ or Ar¹³⁺ ion beam.

JYFL 14 GHz ECRIS

Mixing gas: Oxygen

Microwave power: 600-800 W

Acceleration voltage: 10 kV (JYFL extraction system)

Material consumption: N/A

TWTA was used for charge states 11-16.