Abstract
Samples of carbon sheet pump (CSP) exposed to fast neutrals have been analyzed by using microscopic techniques in order to improve the performance of CSP and to examine the applicability of CSP to actual devices. It has been confirmed from the microscopic viewpoint for the first time that fast neutrals emitted from plasmas generated by the actual confinement device (GAMMA 10) are trapped by the C/C material. A numerical simulation is performed by means of the Monte Carlo simulation code TRIM (ver. TRVMC95) for the sake of the evaluation of the results obtained by elastic recoil detection technique. CSP has been newly applied to the shine-through beam dump of a neutral beam injector in order to test the pumping effect of CSP under the conditions of high heat and particle load (several MW/m 2 and 2.5×10 21 H/m 2 s at the beam center, respectively). It also has been found from pressure-balance analysis that 80% of incident particles are trapped by CSP.
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