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Chronology of the Air Event

Chronology of the Air Event. Incident particles during air glow: 3A/100m 2  2 10 17 /m 2 s, i.e. total fluence 1.3 10 20 N + , 3 10 19 O + /m 2 Maximum chemical removal: 1ML, disregarding synergistic effects with O 2. Residual gas analysis. Nov. 17, 17:23. N 2. N. O 2. O. Ar.

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Chronology of the Air Event

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  1. Chronology of the Air Event

  2. Incident particles during air glow: 3A/100m2  2 1017/m2s, i.e. total fluence 1.3 1020N+, 3 1019O+/m2 Maximum chemical removal: 1ML, disregarding synergistic effects with O2

  3. Residual gas analysis Nov. 17, 17:23

  4. N2 N O2 O Ar Nov. 17, 18:23

  5. Nov. 17, 18:53

  6. Nov. 17, 19:23

  7. Nov. 17, 19:53

  8. NO, C2D3 CO, N2 CO2, N2O webbook.NIST.gov 7. Nitric oxide (NO) 14. Methyl-d1 radical, oxo- (CDO) 17. Formaldehyde (CH2O) 24. Diimide (H2N2) 25. Beryllium dicarbide (CBe2) 29. Amidogen, methylene-d2 (CD2N) 35. Methyl amino radical (CH4N) 37. C2D3 (C2D3) 40. Ethene-d2 (C2H2D2) 42. Ethane (C2H6) N D2O Nov. 17, 20:23

  9. Nov. 17, 20:53

  10. Nov. 17, 21:23

  11. Nov. 18, 00:53

  12. Nov. 18, 03:53

  13. Nov. 18, 04:53

  14. Nov. 18, 05:53

  15. Nov. 18, 09:52

  16. Nov. 18, 10:07

  17. First day after air GDC, 18.11.2004

  18. Nov. 18, 10:22

  19. Nov. 18, 11:37

  20. Nov. 18, 11:52

  21. Nov. 18, 12:37

  22. Nov. 18, 13:07

  23. Nov. 18, 13:52

  24. 16:59 Nov. 18, 16:59

  25. Nov. 18, 18:59

  26. Nov. 19, 03:45

  27. Nov. 19, 04:00

  28. Nov. 19, 04:15

  29. Nov. 19, 05:00

  30. Nov. 19, 06:45

  31. 8:15 Nov. 19, 08:15

  32. Second day after air GD, 19.11.2004

  33. Nov. 19, 08:45

  34. Nov. 19, 09:30

  35. Nov. 19, 09:45

  36. Nov. 19, 16:00

  37. Nov. 20, 05:01

  38. Nov. 20, 09:16

  39. CD4 C2D4 C3D6 Nov. 20, 14:16

  40. Limiter phase: Heating and radiation Nearly 100% radiation limit during first day  disruption no breakdown in next shot

  41. OII horizontal line radiation NII Zeff

  42. Summary • Air Event not useful for an estimate of T cleaning efficiency • air leads to complicated chemistry involving N, O and C • event is badly diagnosed, QMB was closed • surface temperatures were too low, 200C instead of 350C • Air Event indicates reasonable possibilty of recovery • event was not immediately recognised • full recovery after 2 nights of D2 GDC and 1 day DC • Preliminary diagnosis • during air GD NO, CO2 (N2O) are formed • NO adsorbes at the walls and desorbes during discharges • memory effect even at the end of second day

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