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제안 방법
- A beam current of 20 A can be effectively extracted at an accelerating voltage of 90 kV, implying that this experimental result is less than half of the expected beam power of 90 kV/45 A hydrogen. Another practical method of testing this kind of investigation is to measure the beam power (with calorimetry) delivered to the beam target normalized to the accelerating power (Iacc . Vacc), where Vacc is the accelerating voltage. A maximum beam power of 0.
- In this paper, we describe the prototype ion source, the discharge operation mode, and the beam extraction, using a modified accelerator for the ion source.
- 4 A), where the ratio of the gradient grid current (Igrad) to the total beam current (Iacc) is plotted against the perveance (1 upervelO6 ampere - volt3/2). Since the inverse of the ratio represents the q니ality of the beam, this method of investigation can lead to knowledge about the optimum perveance of the accelerator. Optimum beam perveance was 0.
대상 데이터
- A neutral beam injection (NBI) system, to be used as an auxiliary plasma heating system for the Korea Superconducting Tokamak Advanced Research (KSTAR), is being developed, constructed, and tested at the Korea Atomic Energy Research Institute (KAERI) [1], A prototype long pulse ion source (LPIS) has been developed for the NBI system [2], and the beam extraction experiments of the ion source were carried out at the Neutral Beam Test Stand (NBTS) of KSTAR. The design requirements for a prototype LPIS for the NBI system were a 120 kV/65 A deuterium ion beam and a 300 seconds beam pulse length, as well as an initial test ion beam of 90 kV/45 A for 20 seconds with hydrogen. The prototype beamline components have been developed for a neutral beam power of a total 8 MW, ultimately injected to heat the core plasmas of KSTAR, with three long pulse ion sources in a beamline.
- The prototype ion source consists of a magnetic bucket plasma generator with multi-pole cusp fields, based on the US Common Long Pulse Ion Source (CLPIS) [3], and a set of tetrode accelerators with circular apertures. Dimension of the plasma generator is a cross section of 64 x 26 cm2 and a 32 cm depth.
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