The ITER project requires at least two Neutral Beam Injectors (NBIs), each accelerating to 1MV a 40A beam of negative deuterium ions, to deliver to the plasma a power of about 33 MW for one hour as additional heating. A full-size negative ion source (SPIDER - Source for Production of Ion of Deuterium Extracted from RF plasma) and a prototype of the whole 1 MV ITER injector (MITICA - Megavolt ITER Injector & Concept Advancement) are under construction at PRIMA a new test facility for the ITER neutral beams being built at the Consorzio RFX in Padua, Italy. In SPIDER, the source is housed in a stainless steel vessel maintained in high vacuum. A three grid system is foreseen to extract and accelerate at 100kV the beam. For this reason, the vacuum vessel hosts is equipped with three large alumina feedthroughs, ring shaped insulators (800mm in diameter) to insulate the vessel from the hydraulic and electrical services which supply the source components biased at different potentials in the range between -112 and -100kVdc. These insulators (bushings) are one of the most critical items in the SPIDER experiment and they required a particular effort in designing, manufacturing and identifying the proper test procedure. This paper gives an overview of the design, development, manufacturing activities and presents the results of the high voltage tests for the bushing acceptance.
SPIDER High Voltage Bushings: design, development and first experimental tests
Grando L;De Lorenzi A;
2016
Abstract
The ITER project requires at least two Neutral Beam Injectors (NBIs), each accelerating to 1MV a 40A beam of negative deuterium ions, to deliver to the plasma a power of about 33 MW for one hour as additional heating. A full-size negative ion source (SPIDER - Source for Production of Ion of Deuterium Extracted from RF plasma) and a prototype of the whole 1 MV ITER injector (MITICA - Megavolt ITER Injector & Concept Advancement) are under construction at PRIMA a new test facility for the ITER neutral beams being built at the Consorzio RFX in Padua, Italy. In SPIDER, the source is housed in a stainless steel vessel maintained in high vacuum. A three grid system is foreseen to extract and accelerate at 100kV the beam. For this reason, the vacuum vessel hosts is equipped with three large alumina feedthroughs, ring shaped insulators (800mm in diameter) to insulate the vessel from the hydraulic and electrical services which supply the source components biased at different potentials in the range between -112 and -100kVdc. These insulators (bushings) are one of the most critical items in the SPIDER experiment and they required a particular effort in designing, manufacturing and identifying the proper test procedure. This paper gives an overview of the design, development, manufacturing activities and presents the results of the high voltage tests for the bushing acceptance.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
