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Charge exchange recombination spectroscopy (CXRS) based on a diagnostic neutralbeam (DNB) installed in the HT-7 tokamak is introduced. DNB can provide a 6 A extractedcurrent at 50 kV for 0.1 s in hydrogen. It can penetrate into the core plasma in HT-7. The CXRSsystem is designed to observe charge exchange (CX) transitions in the visible spectrum. CX lightfrom the beam is focused onto 10 optical fibers, which view the plasma from -5 cm to 20 cm.The CXRS system can measure the ion temperature as low as 0.1 keV. With CXRS, the local iontemperature profile in HT-7 was obtained for the first time.
Charge exchange recombination spectroscopy (CXRS) based on a diagnostic neutral beam (DNB) installed in HT-7 tokamak is introduced. DNB can provide 6 A extracted current at 50 kV for 0.1 s in hydrogen. -7. The CXRSsystem is designed to observe charge exchange (CX) transitions in the visible spectrum. CX lightfrom the beam is focused onto 10 optical fibers, which view the plasma from -5 cm to 20 cm. The CXRS system can measure the ion Temperature as low as 0.1 keV. With CXRS, the local ion temperature profile in HT-7 was obtained for the first time.