NIFS-614

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Author(s):

J. Miyazawa, H. Yamada, K. Yasui, S. Kato, N., Fukumoto, M. Nagata and T. Uyama

Title:

Design of Spheromak Injector Using Conical Accelerator for Large Helical Device

Date of publication:

Nov. 1999

Key words:

Compact Toroid, LHD, acceleration efficiency, conical accelerator, adiabatic compression

Abstract:

Optimization of CT injector for LHD has been carried out and conical electrode for adiabatic CT compression is adopted in the design. Poing-model of CT acceleration in a co-axial electrode is solved to optimize the electrode geometry and the power supplies. Large acceleration efficiency of 34% is to be obtained with 3.2 m long conical accelerator and 40 kV - 42 kJ power supply. The operation scenario of a CT injector named SPICA mk. I (SPheromak Injector using Conical Accelerator) consisting of 0.8 m conical accelerator is discussed based on this design.

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