Stabilization of sawteeth instability by short gas pulse injection in ADITYA-U tokamak
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866918125376634880 |
|---|---|
| author | Dolui, Suman Singh, Kaushlender Hegde, Bharat Macwan, T. Hoque, SK Injamul Nagora, Umesh A., Jaya Kumar Purohit, S. Adhiya, A. N. Jadeja, K. A. Raj, Harshita Kumar, Ankit Kumawat, Ashok K. Aich, Suman Kumar, Rohit Patel, K. M. Gautam, P. Patel, Sharvil Yadava, N. Ramaiya, N. Gupta, M. K. Pathak, S. K. Chowdhuri, M. B. Sharma, S. Kuley, A. Tanna, R. L. Chattopadhyay, P. K. Sen, A. Saxena, Y. C. Pal, R. Ghosh, Joydeep |
| author_facet | Dolui, Suman Singh, Kaushlender Hegde, Bharat Macwan, T. Hoque, SK Injamul Nagora, Umesh A., Jaya Kumar Purohit, S. Adhiya, A. N. Jadeja, K. A. Raj, Harshita Kumar, Ankit Kumawat, Ashok K. Aich, Suman Kumar, Rohit Patel, K. M. Gautam, P. Patel, Sharvil Yadava, N. Ramaiya, N. Gupta, M. K. Pathak, S. K. Chowdhuri, M. B. Sharma, S. Kuley, A. Tanna, R. L. Chattopadhyay, P. K. Sen, A. Saxena, Y. C. Pal, R. Ghosh, Joydeep |
| contents | Experiments on ADITYA-U tokamak show a marked enhancement in the sawtooth period by application of short gas puffs of fuel that cause a modification of the radial density profile. A consequent suppression of the trapped electron modes (TEMs) then leads to an increase in the core electron temperature. This slows down the heat propagation following a sawtooth crash, causing a delay in achieving the critical temperature gradient inside the q = 1 surface required for the next sawtooth crash to happen. The overall scenario has strong similarities with the behavior of sawtooth under electron cyclotron resonance heating (ECRH). Our findings suggest an alternate, simpler technique for sawtooth control that may be usefully employed in small/medium-sized tokamaks that do not have an ECRH or any other auxiliary heating facility. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_01871 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Stabilization of sawteeth instability by short gas pulse injection in ADITYA-U tokamak Dolui, Suman Singh, Kaushlender Hegde, Bharat Macwan, T. Hoque, SK Injamul Nagora, Umesh A., Jaya Kumar Purohit, S. Adhiya, A. N. Jadeja, K. A. Raj, Harshita Kumar, Ankit Kumawat, Ashok K. Aich, Suman Kumar, Rohit Patel, K. M. Gautam, P. Patel, Sharvil Yadava, N. Ramaiya, N. Gupta, M. K. Pathak, S. K. Chowdhuri, M. B. Sharma, S. Kuley, A. Tanna, R. L. Chattopadhyay, P. K. Sen, A. Saxena, Y. C. Pal, R. Ghosh, Joydeep Plasma Physics Popular Physics Experiments on ADITYA-U tokamak show a marked enhancement in the sawtooth period by application of short gas puffs of fuel that cause a modification of the radial density profile. A consequent suppression of the trapped electron modes (TEMs) then leads to an increase in the core electron temperature. This slows down the heat propagation following a sawtooth crash, causing a delay in achieving the critical temperature gradient inside the q = 1 surface required for the next sawtooth crash to happen. The overall scenario has strong similarities with the behavior of sawtooth under electron cyclotron resonance heating (ECRH). Our findings suggest an alternate, simpler technique for sawtooth control that may be usefully employed in small/medium-sized tokamaks that do not have an ECRH or any other auxiliary heating facility. |
| title | Stabilization of sawteeth instability by short gas pulse injection in ADITYA-U tokamak |
| topic | Plasma Physics Popular Physics |
| url | https://arxiv.org/abs/2501.01871 |