@techreport{oai:nifs-repository.repo.nii.ac.jp:00009957, author = {"Miyazawa, J. and Yamada, H. and Yasui, K. and Kato, S. and Fukumoto, N. and Nagata, M. and Uyama, T."}, month = {Nov}, note = {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.}, title = {Design of Spheromak Injector Using Conical Accelerator for Large Helical Device}, year = {1999} }