| Autor: |
D. P. Thakkar, V. Vadher, S. Rambabu, Ujjwal Baruah, Santosh P. Pandya, V. Prahlad, P. J. Patel, S.K. Sharma, M.R. Jana, L. K. Bansal, S. Parmar, B. Pandya, A.K. Sahu, K. Qureshi, C. B. Sumod, P. Bharathi, N. Contractor, L. N. Gupta, B. Choksi, B. Sridhar |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
The Review of scientific instruments. 85(11) |
| ISSN: |
1089-7623 |
| Popis: |
The neutral beam injector of steady state superconducting tokamak (SST1-NBI) at IPR is designed for injecting upto 1.7 MW of neutral beam (Ho, 30-55 keV) power to the tokamak plasma for heating and current drive. Operations of the positive ion source (PINI or Plug-In-Neutral-Injector) of SST1-NBI were carried out on the NBI test stand. The PINI was operated at reduced gas feed rate of 2-3 Torr l/s, without using the high speed cryo pumps. Experiments were conducted to achieve a stable beam extraction by optimizing operational parameters namely, the arc current (120-300 A), acceleration voltage (16-40 kV), and a suitable control sequence. The beam divergence, power density profiles, and species fractions (H(+):H2(+):H3(+)) were measured by using the diagnostics such as thermal calorimetry, infrared thermography, and Doppler shift spectroscopy. The maximum extracted beam current was about 18 A. A further increase of beam current was found to be limited by the amount of gas feed rate to the ion source. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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