Development of the poloidal Charge eXchange Recombination Spectroscopy system in Heliotron J
Abstract
A Charge eXchange Recombination Spectroscopy (CXRS) system designed to measure the poloidal rotation velocity is developed in Heliotron J. The poloidal CXRS system measures the carbon emission line (C VI, n=8-7, 529.05nm) and the Doppler shift of the emission line provides the information of plasma rotation velocity. A high throughput photographic-lens monochromator (F/2.8) with 0.73nm/mm dispersion is adopted to achieve high rotation velocity and temporal resolution. Since two heating neutral beams from two tangential injectors (NBI) are used as the diagnostic beams, a wide observation range (0.26<r/a<0.92) is covered by 15 sightlines with a high spatial resolution(d<r/a> < 0.06) at peripheral region (r/a>0.6). The system design and the calibration method are presented. The initial results of poloidal rotation measurement show an electron diamagnetic rotation in an NBI heated plasma, while an ion diamagnetic rotation is observed when ECH is additionally applied. The evaluated radial electric field profile shows a positive Er at plasma core region in the ECH+NBI plasma, and a negative Er in the NBI heated plasma.
Keywords
Cite
@article{arxiv.1803.08339,
title = {Development of the poloidal Charge eXchange Recombination Spectroscopy system in Heliotron J},
author = {X. X. Lu and S. Kobayashi and T. Harada and S. Tanohira and K. Ida and S. Nishimura and Y. Narushima and D. L. Yu and L. Zang and K. Nagasaki and S. Kado and H. Okada and T. Minami and S. Ohshima and S. Yamamoto and Y. Yonemura and N. Haji and S. Watanabe and H. Okazaki and T. Kanazawa and P. Adulsiriswad and A. Ishizawa and Y. Nakamura and S. Konoshima and T. Mizuuchi},
journal= {arXiv preprint arXiv:1803.08339},
year = {2018}
}
Comments
With 20 pages, 10 figures