Development of carbon sheet pump for control of hydrogen recycling in the GAMMA 10 tandem mirror

The pumping characteristic of carbon sheet pump (CSP) under the condition of high heat and particle load (several MW/m2 and 2.5×1021 H/m2 at the beam center, respectively) is described. Heat transfer calculation is performed for the sake of estimation of the temperature rise. The result shows a high heat conductive C/C material is suitable for this purpose under the condition. Pumping experiments proved that the pumping effect of CSP on neutral beam and recovery of the effect by regeneration experiment by the use of neutral beam injector (21 keV, 20 A) as a high heat and particle source. These results indicate that CSP is applicable under the condition of high heat and particle load.