MITICA, the full scale prototype of ITER Heating Neutral Beam (HNB) -required to heat up ITER plasma with 16.5MW injected power- is under realization at the Neutral Beam Test Facility (NBTF) in Padova (Italy) with the contributions of Japanese (JADA) and European (EUDA) Domestic Agencies (DA's). The neutral beam is obtained by accelerating negative Deuterium ions up to 1MeV for a total ion current of 40A and then neutralized. MITICA Power Supply (PS), installed from 2016 to 2019, includes several non-standard equipment, with ratings beyond the present industrial standard for insulation voltage level (-1MVdc) and dimensions: a) the Acceleration Grid Power Supply system (AGPS), composed of five DC generators (DCG) rated for -200kVdc each, connected in series to produce -1MVdc acceleration voltage; b) the Ion Source and Extraction Power Supply system (ISEPS); c) a large air insulated Faraday cage (High Voltage Deck1, HVD1) hosting ISEPS and connected to the Transmission Line (TL) through an air to SF6 Bushing (High Voltage Bushing Assembly, HVBA); d) a 100m gas (SF6) insulated TL, connecting AGPS and ISEPS to the beam source installed inside the vacuum vessel through e) the SF6 to vacuum HV Bushing. The definition of the interfaces both between components supplied by the different DA's and towards the buildings have been studied and defined as far as possible during the design phase. Nevertheless, during the installation phase some issues emerged and had to be solved, minimizing modifications to the components already manufactured. The paper deals with the experience gained during the installation activities, focusing on solutions to interface the aforementioned equipment with NBTF buildings according to the stringent dimensional requirements and on the electrical insulation issues of the TL from the buildings. Moreover, solutions to interface the TL with HVBA from electrical and mechanical point of view are described.
1MV POWER SUPPLIES INTEGRATION ISSUES IN MITICA EXPERIMENT, THE ITER HEATING NEUTRAL BEAM INJECTOR PROTOTYPE
Grando Luca;Toigo Vanni;Zaccaria Pierluigi;
2020
Abstract
MITICA, the full scale prototype of ITER Heating Neutral Beam (HNB) -required to heat up ITER plasma with 16.5MW injected power- is under realization at the Neutral Beam Test Facility (NBTF) in Padova (Italy) with the contributions of Japanese (JADA) and European (EUDA) Domestic Agencies (DA's). The neutral beam is obtained by accelerating negative Deuterium ions up to 1MeV for a total ion current of 40A and then neutralized. MITICA Power Supply (PS), installed from 2016 to 2019, includes several non-standard equipment, with ratings beyond the present industrial standard for insulation voltage level (-1MVdc) and dimensions: a) the Acceleration Grid Power Supply system (AGPS), composed of five DC generators (DCG) rated for -200kVdc each, connected in series to produce -1MVdc acceleration voltage; b) the Ion Source and Extraction Power Supply system (ISEPS); c) a large air insulated Faraday cage (High Voltage Deck1, HVD1) hosting ISEPS and connected to the Transmission Line (TL) through an air to SF6 Bushing (High Voltage Bushing Assembly, HVBA); d) a 100m gas (SF6) insulated TL, connecting AGPS and ISEPS to the beam source installed inside the vacuum vessel through e) the SF6 to vacuum HV Bushing. The definition of the interfaces both between components supplied by the different DA's and towards the buildings have been studied and defined as far as possible during the design phase. Nevertheless, during the installation phase some issues emerged and had to be solved, minimizing modifications to the components already manufactured. The paper deals with the experience gained during the installation activities, focusing on solutions to interface the aforementioned equipment with NBTF buildings according to the stringent dimensional requirements and on the electrical insulation issues of the TL from the buildings. Moreover, solutions to interface the TL with HVBA from electrical and mechanical point of view are described.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
