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    User name vasulk

    Entry time Mon Apr 29 11:40:27 EDT 2002

    Entry number 301

    keyword=Exodus NMR polarization in Transverse

    This morning I conducted a NMR measurement for Exodus, which is in transverse pumping. So I needed to rotate the field to 0 degrees for the measurement. To extract the polarization, I needed to go back to the Temperature test conducted for Exodus at the beginning of March to find the calibration constant with the lasers off. Below is a summary of the temperatures and densities for that temperature test for the lasers off.

    Laser state T_p T_t T_c n_t n_c constant (%/mv)
    ================================================
    off 163.07 31.28 36.71 11.22 11.02 3.08
    off 162.63 31.24 36.08 11.22 11.04 3.08

    Analysis of the NMR signal gave a signal height of 11.38 mV, or 35.05% polarization. Note that the cell is not centered in the oven, which is why the polarization is lower than before (42.5% in long.).

    legend for the table:
    T_p: Average temperature from RTD 6 and 7
    T_t: Temperature of target chamber from RTDs 1-5
    T_c: Temperature of target chamber in pickup coils from RTDs 2-4
    n_t: Density of target chamber
    n_c: Density of target chamber in pickup coils

    All temperatures are in degree C, and densities, in amagats