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Title: Effects of q(r) on the Alpha Particle Ripple Loss in TFTR

An experiment was done with TFTR DT plasmas to determine the effect of the q(r) profile on the alpha particle ripple loss to the outer midplane. The alpha particle loss measurements were made using a radially movable scintillator detector 20 degrees below the outer midplane. The experimental results were compared with TF ripple loss calculations done using a Monte Carlo guiding center orbit following code, ORBIT. Although some of the experimental results are consistent with the ORBIT code modeling, the variation of the alpha loss with the q(r) profiles is not well explained by this code. Quantitative interpretation of these measurements requires a careful analysis of the limiter shadowing effect, which strongly determines the diffusion of alphas into the detector aperture.
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Publication Date:
OSTI Identifier:
Report Number(s):
ON: DE00004507
DOE Contract Number:
Resource Type:
Technical Report
Research Org:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
70 PLASMA PHYSICS AND FUSION; Plasma Waves; Wavelengths; Wave Forms; Alpha Particles; Helium Ions; Particle Losses; TFTR Tokamak; Limiters; Shadow Effect; Mathematical Models; Monte Carlo Method; O Codes; Experimental Data