Difference between revisions of "Polhe3 meeting 20120418"

Latest revision as of 01:13, 1 May 2012

• progress
  • after checking optics, Boris polarization is still low and dropping. see [1]
  • finished AFP loss test for Cell Gravy. see details [2]

• todo
  • • Use the Moss cell to check system again.
      • masing effect for Moss cell ( polarization ~ 20%), details see [3] and [4]
      • set up the gradient coil
      • test different currents and thresholds
      • test the new method to destroy target chamber polarization for diffusion model.
    • if system OK. we will do following (2 weeks):temperature optimization and diffusion test (225~240, may add point 220)
      • temperature stabilized ~ 4 hours
      • spin up. Note:
        • field sweep
        • 12sweep * 2 hours ( if spin up time > 6hours),
        • 15sweep * 1 hours ( if spin up time < 6hours)
      • do EPR
      • do internal temperature test. Note:
        • do NMR field sweep: laser on - off - on - off- on, each time temperature should be stabilized, ~ 20min), total: 1.5 hour
      • do AFP loss with laser on( do both field sweep and freq sweep, temperature stabilized)
        • do NMR field sweep 5~10 sweeps, check immediately,if not stable, should use 10 sweeps.Note：
        • then do NMR freq sweep 5~ 10 sweeps, check immediately,if not stable, should use 10 sweeps.
        • then do one field sweep- do one frequency sweep - do one field sweep - do one frequency sweep - do one field sweep- do one freq sweep, when begin to measure， click on loaddata， no need to change phase now.
        • purpose: to get the signal ratio of FIELD SWEEP/FREQ SWEEP, to do cross calibration ( EPR and water calibration)
      • do diffusion model ~ 6 hours. Note:
        • it is better to use field sweep for diffusion， click loaddata when run the program
        • 37 sweep *10 min
      • wait for another 3~6 hour( polarization is become stable),or we can put it in diffusion test.
        • purpose: it depends on the results of destroying polarization, if polarization is high and stable, we can ignore this step.
      • do AFP loss with laser off, using field sweep( temperature stabilized, 5~ 10 sweeps),check immediately
      • do hot spin-down, field sweep ~ 10 sweep * 2 hours
      • do one cold spin down for this cell after finishing all temperature tests ~18 hours
      • have any question about above procedures, please call me (Jie: 434-327-7584).

• Calendar