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Test results of MKD/B1 UA63/67 radiation levels

Test results of MKD/B1 UA63/67 radiation levels. Viliam Senaj LIBD meeting 25/09/2013. Radiation measurements in UA63/67. Schematics of UA63. Schematics of UA67. Evaluation of TLDs installed in 2009. To be learned from the radiation measurements.

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Test results of MKD/B1 UA63/67 radiation levels

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  1. Test results of MKD/B1 UA63/67 radiation levels ViliamSenaj LIBD meeting 25/09/2013

  2. Radiation measurements in UA63/67

  3. Schematics of UA63

  4. Schematics of UA67

  5. Evaluation of TLDs installed in 2009

  6. To be learned from the radiation measurements • Radmons - too insensitive (for doses at UA) • TLDs – clear effect of non-shielded ducts (in front of Gen. G/H & N/O) • Visible effect of shielded duct in front of Gen.C – no increased dose • To evaluate TLDs correctly we need to deduce background (x-ray etc.) but we don't have reference measurement. Background estimated to 0.8 mSv. HEH = dose x 2.5e6 so max HEH fluences ~ 6e5 HEH/cm2 (if neglected 2009-2011) • Average fluence probably close to estimated one (1e5 HEH/cm2.year) • Shielding of residual large openings requested

  7. T_delay comparison prior and after LS1 maintenance

  8. T_rise comparison prior and after LS1 maintenance

  9. I_ref100% comparison prior and after LS1 maintenance

  10. R_end comparison prior and after LS1 maintenance

  11. R_1 comparison prior and after LS1 maintenance

  12. R_2 comparison prior and after LS1 maintenance

  13. Corrected T_delay after LS1 maintenance

  14. T_riseafter LS1 maintenance

  15. Target T_delay after LS1

  16. I_ref/E after LS1 maintenance

  17. T_rise after LS1 maintenance

  18. R1 after LS1 maintenance

  19. New settings

  20. Comparison MKBs – I_max1

  21. Comparison MKBs – I_min1

  22. Comparison MKBs – R_max2

  23. Comparison MKBs – T_zero1

  24. Comparison MKBs – T_zero4

  25. Comparison MKBs – Low_thr

  26. Resonance between GTO stacks without and with damping ferrite tores • Artificially induced resonant ringing between 2 stacks (1 nf in parallel with 1 GTO) – simulating effect of sparking; signal measured on retring pick-ups Cts2 a&b • Resonance at ~ 2 MHz with low damping factor generally observed • Adding of a lossy ferrite in HV path of each GTO stack (tore cutted in two – no need for dissasembly) – reducing resonant frequency to ~ 1 MHz; significant damping and saturation effect (increasing T_threshold and reducing T_rise)

  27. Energy scan without and with FT Increased T_thr without much influence to T_delay = reduced T_rise (~-30 ns)

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