ICRF stabilization of sawteeth on TFTR
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- Princeton Univ., NJ (United States). Plasma Physics Lab.
- Massachusetts Inst. of Tech., Cambridge, MA (United States)
- Grumman Corp., Princeton, NJ (United States)
- Oak Ridge National Lab., TN (United States)
- Tokyo Univ. (Japan)
- Mission Research Corp., Newington, VA (United States)
Results obtained from experiments utilizing high power ICRF (ion cyclotron range of frequency) heating to stabilize sawtooth oscillations on TFTR are reviewed. The key observations include existence of a minimum ICRF power required to achieve stabilization, a dependence of the stabilization threshold on the relative size of the ICRF power deposition profile to the q=1 volume, and a peaking of the equilibrium pressure and current profiles during sawtooth-free phases of the discharges. In addition, preliminary measurements of the poloidal magnetic field profile indicate that q on axis decreases to a value of 0.55{plus_minus}0.15 after a sawtooth-stabilized period of {approximately}0.5 sec has transpired. The results are discussed in the context of theory, which suggests that the fast ions produced by the ICRF heating suppress sawteeth by stabilizing the m=1 MHD instabilities believed to be the trigger for the sawtooth oscillations. Though qualitative agreement is found between the observations and the theory, further refinement of the theory coupled with more accurate measurements of experimental profiles will be required in order to complete quantitative comparisons.
- Research Organization:
- Princeton Univ., NJ (United States). Plasma Physics Lab.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 10119139
- Report Number(s):
- PPPL--2820; ON: DE92006648
- Country of Publication:
- United States
- Language:
- English
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