ETL-TPE-1 の装置設計

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The Toroidal Pinch Experiment at Electrotechnical Laboratory (ETL-TPE 1) is designed to study the confinement of the high beta plasma in an axially symmetric toroidal system with a combination of axial and azimuthal magnetic fields. The toroidal discharge vessel has a major radius of 40 cm and a minor radius of 5 cm. The capacitor bank system consists of four individual circuits. It includes a slow bank producing a field of ±2 KG with a period of 500 μsec, a preheat bank of high frequency (about 1 MH_z at 40 KV), a θ-bank of 150 KJ at 40 KV with a rise time of about 2.3 μsec producing a field of 26 KG and a z-bank being able to generate a current up to ten times of the Kruskallimit current. In this paper the θ-and preheat banks to be built in 1971 are described. We carried out a fundamental experiment of a field distortion type start gap for θ-circuit of ETL-TPE 1 apparatus. This report is an experimental result about a simple field distortion type gap that we designed for ETL-TPE 1. And we attained our expected object of getting low jitter and lelay time. As passive crowbar gap for 150 KJ ETL-TPE 1 apparatus with high reliability and low-maintenance, a ferrite decoupled spark gap has developed with the triggering method of IPP in Garching. Short remarks are given about the operating method of the gap in Garching and in Los Alamos respectively and operating conditions of this type of crowbar gap are listed up too. Experimental results as the voltages by ferrite cores and load current wave forms are reported. ETL-TPE 1 coil and collector are designed. Personal safety and easy operation are the design philosophy of ETL-TPE 1. The second feature of this apparatus is that z-coil which produce poloidal magnetic field is used as metal shell. Therefore the insulation between z-coil and θ-coil producing troidal magnetic field is almost attributed to the insulation strength of θ-coil. Los Alamos type cartridge are also used. The analytical and experimental studies of the effects of deformed cylindrical metal shells on the magnetic field disturbance are reported. It is assumed that the metal shells and the plasmas are both linear cylinders and the plasmas have sharp boundaries sorrounded by vacuum. First, the axial magnetic fields in the metal cylinder with a slit along the axis are treated analitically, and it was proved that the slit has negligibly small effect on the magnetic field. Second, the effects of plasma drift on circular magnetic fields in the cylindrical metal shell are treated analitically, and the effects are clarified with simple expressions. Third, the effects of plasma drift on circular magnetic fields in the metal cylinder, which has partially different radious and some deformations for plasma diagnostics, are studied by experiments.
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ETL-TPE-1 の装置設計

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