The High Voltage RadioFrequency Test Facility (HVRFTF) has been developed with the aim to be a simple, accessible and flexible test facility to characterize the dielectric strength in vacuum of the RF drivers of SPIDER and MITICA ion source and effectively address the issues related to their voltage hold off when subjected to their operating radiofrequency E-fields and pressure. This report presents the results of the test campaigns carried out in 2018, with a low pressure argon atmosphere, on driver mockups #1 and #3 having the same geometry (plane-disk-sphere) but with different dielectric disk material: alumina and quartz. The available RF amplifier and resonant circuit allowed the operation with voltage up to 9 kV at the frequency of 1.07 MHz. The breakdowns detected are associated to glow discharges, related to the operation in regimes described by the left branch of the Paschen curve.
HVRFTF: Experimental campaign on driver mockups #1 and #3 in a low pressure Argon atmosphere
Recchia M;Rossetto F
2019
Abstract
The High Voltage RadioFrequency Test Facility (HVRFTF) has been developed with the aim to be a simple, accessible and flexible test facility to characterize the dielectric strength in vacuum of the RF drivers of SPIDER and MITICA ion source and effectively address the issues related to their voltage hold off when subjected to their operating radiofrequency E-fields and pressure. This report presents the results of the test campaigns carried out in 2018, with a low pressure argon atmosphere, on driver mockups #1 and #3 having the same geometry (plane-disk-sphere) but with different dielectric disk material: alumina and quartz. The available RF amplifier and resonant circuit allowed the operation with voltage up to 9 kV at the frequency of 1.07 MHz. The breakdowns detected are associated to glow discharges, related to the operation in regimes described by the left branch of the Paschen curve.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
