On comparison of spectroscopically deduced central ion temperatures and plasma rotation at JETFunded under: FP2-FUSION 10C
It is shown that a significant increase in the consistency of charge exchange spectroscopy and X-ray spectroscopy deduction of central ion temperature and plasma rotation is obtained when allowance is made for two particular factors. The first of these is the charge exchange cross section dependence on the impact energy of the neutral beam atoms in the frame-of-reference of the C(+6) nuclei. The predicted cross section effects on ion temperature and plasma rotation measurements are verified experimentally by comparison with passive X-ray spectroscopy. The effect increases with lighter species. The second factor is the precise position of the radiating ion shell in line-of-sight averaged measurements using X-ray spectroscopy. For high temperature plasmas with broad emission profiles the uncertainty in central ion temperature is reduced from a maximum of 60% to approximately 20%.
Bibliographic Reference: Report: JET-P(91)19 EN (1991) 19 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199111274 / Last updated on: 1994-12-02
Original language: en
Available languages: en