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Current Status of DNB and CXRS on HT-7

Current Status of DNB and CXRS on HT-7. DNB team 2011-05-07. Overview. Introduction of DNB and CXRS Current status Problems and potential solutions Experimental Results Ohmic discharge LHCD discharge Conclusions. DNB & CXRS. DNB status.

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Current Status of DNB and CXRS on HT-7

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  1. Current Status of DNB and CXRS on HT-7 DNB team 2011-05-07

  2. Overview • Introduction of DNB and CXRS • Current status • Problems and potential solutions • Experimental Results • Ohmic discharge • LHCD discharge • Conclusions

  3. DNB & CXRS

  4. DNB status • Stable and reliable – HV power supply, Ion source, neutralizer, cryogenic pump, vacuum • Can operate on each plasma discharge if the rest time is sufficiently long • System capability • HV: 43~45kV; • Extracted beam current: 4.5 – 5.5A; • Full energy H component: ~20% • Information on beam power profile and beam divergence angle NOT available

  5. DNB status DNB #13749

  6. CXRS status • CX signal of carbon C-VI (n=8->7) transition at 529.1nm in second order • McPherson 207 spectrometer • 1200g/mm, Resolution: 0.03nm/331.3nm, Dispersion: 1.24nm/mm • New Princeton Instrument ProEM EMCCD • 512*512 (16*16um); 95% peak Q.E.; Adjustable gain of electron multiplication for low-intensity lights(1-1000) • Problem: very small change in CXR signal with DNB injection • Solution: two discharges with nearly identical parameters • One without DNB injection to be used as background signal • A large EM avalanche gain for signal enhancement (100)

  7. Ohmic discharge

  8. Ohmic discharge • HV=45kV, Ibeam=5.5A

  9. Ohmic discharge • HV=45kV, Ibeam=5.5A

  10. Ti-111573

  11. LHCD discharge

  12. LHCD discharge • HV=43kV, Ibeam=4.9A

  13. Ti-111565

  14. Conclusions • DNB & CXRS are working properly • Use two-identical-shot technique and a large EM gain to improve signal strength • May contain relatively large uncertainty • Potential improvement • Beam quality (Full energy H fraction, HV, Ibeam, beam focusing) • Use CCD’s larger EM gain (larger noise) • Plasma parameter (higher ne?) • More experiments under ICRF heated discharges

  15. Thank you all & Have a nice day!

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