A simulation study of a windowless gas-stripping room in an E//B neutral particle analyzer

Design of the stripping unit and the electromagnetic analysis unit for the E//B NPA on HL-2A/2M tokamak

“…100,000 events are traced for each condition. The formerly published paper [11] has given a lot of further details for the calculation of both R and f +1 .…”

“…The reason is explained as follows. Both the cross-sections of H→H + +e − and H + +e − →H are so high at 20 keV (see figure 5 of [11]) that even at 20 Pa the reaction is saturated for these two reactions. The cross-section of H+e − →H − is much lower so that processes (3) and (4) could be neglected.…”

“…Figure 2(a) shows the mechanical design of the stripping unit and the dimensions are labeled in figure 2(b). The stripping unit is composed of a stripping room (equipped with two differential tubes and a gas supply bellows), a vacuum chamber (equipped with two collimating holes) and a vacuum pumping system[11]. Stripping room 1 is the main position of gas storage and bellows 4 supplies H 2 to it.…”

The research progress of an E//B neutral particle analyzer

“…It can provide the energy distribution function of fast ions, which is of great importance in the frontier physics study of energetic particles [16][17][18][19][20][21][22], and the isotope composition by measuring the charge exchange neutral particles (H, D, T and ) escaping from the hot plasma. Since the first historic NPA was built [1] and applied [23] on an Alpha magnetic confinement system, a large number of different types of NPAs have been successfully developed around the world [1][2][3][4][5][6][7][8][9]. For example, the // spectrometer [6] developed at the Princeton Plasma Physics Laboratory has an energy range of 0.5 < (amu) (keV) < 600 and a mass resolution of , and (or ) ions.…”