Inside the new laboratory for the development of the ITER neutral beam injector prototype PRIMA (Padova Research on Injector Megavolt Accelerated), whose construction was entrusted to the Consorzio RFX Padova, two experimental plants will be installed to study new systems for the production of neutral particles accelerated to high energy to heat the plasma, called MITICA (Megavolt ITER Injector & Concept Advancement) and SPIDER (Source for Production of Ion of Deuterium Extracted from Rf plasma). The ions for the plasma heating are produced inside SPIDER and MITICA negative ion sources by 8 Radio Frequency (RF) drivers, supplied by 4 independent and identical circuits, each composed of a RF oscillator working at 1 MHz, Coaxial cables with characteristic impedance, Matching network for load adaptation and two RF coils connected in series. To study the voltage holding capability of the RF drivers, a test bed called HVRFTF (High Voltage Radio Frequency Test Facility) has been installed at Consorzio RFX. The RF drivers working conditions in terms of voltage and pressure are reproduced for that purpose and to identify possible critical issues and improvements. This is practically made using a cylindrical vacuum chamber where two electrodes are installed: a proper pumping and gas injection system allow the achievement of the desired working pressure, while the high voltage is generated by means of a resonant circuit supplied with a RF low voltage power amplifier. The paper will describe the functional specifications, criteria, and setup of the plants designed for HVRFTF.
High Voltage Radio Frequency Test Facility for the voltage holding of drivers used in Neutral Beam Injector ion sources
Rossetto F;Cervaro V;Recchia M;Gaio E;Toigo V
2017
Abstract
Inside the new laboratory for the development of the ITER neutral beam injector prototype PRIMA (Padova Research on Injector Megavolt Accelerated), whose construction was entrusted to the Consorzio RFX Padova, two experimental plants will be installed to study new systems for the production of neutral particles accelerated to high energy to heat the plasma, called MITICA (Megavolt ITER Injector & Concept Advancement) and SPIDER (Source for Production of Ion of Deuterium Extracted from Rf plasma). The ions for the plasma heating are produced inside SPIDER and MITICA negative ion sources by 8 Radio Frequency (RF) drivers, supplied by 4 independent and identical circuits, each composed of a RF oscillator working at 1 MHz, Coaxial cables with characteristic impedance, Matching network for load adaptation and two RF coils connected in series. To study the voltage holding capability of the RF drivers, a test bed called HVRFTF (High Voltage Radio Frequency Test Facility) has been installed at Consorzio RFX. The RF drivers working conditions in terms of voltage and pressure are reproduced for that purpose and to identify possible critical issues and improvements. This is practically made using a cylindrical vacuum chamber where two electrodes are installed: a proper pumping and gas injection system allow the achievement of the desired working pressure, while the high voltage is generated by means of a resonant circuit supplied with a RF low voltage power amplifier. The paper will describe the functional specifications, criteria, and setup of the plants designed for HVRFTF.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
