6533b872fe1ef96bd12d2f1b
RESEARCH PRODUCT
The effect of rf pulse pattern on bremsstrahlung and ion current time evolution of an ECRIS.
H. KoivistoO. TarvainenDaniela LeitnerTaneli KalvasP. JonesVille ToivanenT. RopponenP. PeuraJ. Nolandsubject
Materials scienceIon beamlawRF power amplifierBremsstrahlungParticle acceleratorPlasma diagnosticsIon currentPlasmaRadio frequencyAtomic physicsInstrumentationlaw.inventiondescription
Time-resolved helium ion production and bremsstrahlung emission from JYFL 14 GHz ECRIS is presented with different radio frequency pulse lengths. rf on times are varied from 5 to 50 ms and rf off times from 10 to 1000 ms between different measurement sets. It is observed that the plasma breakdown occurs a few milliseconds after launching the rf power into the plasma chamber, and in the beginning of the rf pulses a preglow transient is seen. During this transient the ion beam currents are increased by several factors compared to a steady state situation. By adjusting the rf pulse separation the maximum ion beam currents can be maintained during the so-called preglow regime while the amount of bremsstrahlung radiation is significantly decreased.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-03-03 | The Review of scientific instruments |