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FADC as a very sensitive instrument for online purity control of protium and amplitude thresholds.

FADC as a very sensitive instrument for online purity control of protium and amplitude thresholds. Oleg Maev – PNPI. Outline: online monitoring of the outgasing control of the thresholds . Perspectives in deuterium issue. Online monitoring of outgasing. Results of summer-fall 2003 run.

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FADC as a very sensitive instrument for online purity control of protium and amplitude thresholds.

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  1. FADC as a very sensitive instrument for online purity control of protium and amplitude thresholds. Oleg Maev – PNPI • Outline: • online monitoring of the outgasing • control of the thresholds. • Perspectives in deuterium issue. Oleg Maev

  2. Online monitoring of outgasing.Results of summer-fall 2003 run This picture presents the rates of outgasing for two clean fillings during the last production run. The rate for first clean filling was ~ 0.10 ppm/day, for the second filling ~ 0.14 ppm/day. ( the data were normalized to the result of chromotographic analysis, point ) Oleg Maev

  3. Run with nitrogen-doped protium Oleg Maev

  4. Yields of the main reactions on the impurities CZ~10-8 Cd~10-6 Oleg Maev

  5. Display of FADC signals from -capture on impurities March, 2000 HV = 5,3 kV Oleg Maev

  6. FADC Trigger Oleg Maev

  7. Track of stopped muon in TPC E1 -energy of muon on the stop anodes, E2 -energy of muon on the stop-1 anodes, etc. Very narrow peaks beginning from stop-2 (E3) anodes ! E1 ~ 0 -230 keV E2 ~ 100 - 200 keV E3 ~ 90 keV E4 ~ 72 keV E5 ~ 66 KeV E6 ~ 60 keV E7 ~ 54 keV E8 ~ 51 keV Check of Gena’s calibration The main criteria for searching the -capture events is the good selection of stopped muons ! Oleg Maev

  8. Histograms of the main parameters of FADC signals from -capture on impurities Here, the spectra of signals from recoil nuclei and charged particles (p, d, , etc.) which appear in -capture reactions are presented Oleg Maev

  9. Problems and perspectives in monitoring of impurities - advantages: - trigger - slow stream of data ~ 10 Hz (should be much less) - prompt analysis ( on a small amount of data) - information about amplitude and shape of signals (analysis of background is possible) - disadvantages: - ~30% of statistics only (16 FADC) - probability to lose statistics from the trigger - problems of the last run: - inaccurate muon prescaler - unexplained problem in trigger performance -perspectives: - expansion of FADC to all TPC anodes (?) - application of FPGA as the best trigger logic (?) Oleg Maev

  10. Control of the gas gain 15% change in amplitude from different pressures inside of the chamber ( 1% change of pressure  ~25% change of gas gain) Increasing HV by 20V  10% increase of amplitude Oleg Maev

  11. Recombination effect 27 % decrease of amplitude is prompted by 4 times decrease of the drift field. Recombination Oleg Maev

  12. Diffusion issue In the case of expansion FADC to all TPC anodes we have a possibility to detect the products of the fusion reaction. It means: HV  5.3 kV (to detect track of Alvaretz muon (2.5keV/mm), the new trigger logic: - Ehh on the same anode  Ehh on any anode, - rejection of double muons by using the signals of first anodes Oleg Maev

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