1 / 15

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.

huy
Download Presentation

Current Status of DNB and CXRS on HT-7

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!

More Related