Make New Entry, Make Followup Entry
User name Jin Huang
Log entry time 12:57:52 on May 26, 2009
Entry number 276598
This entry is a followup to: 276586
keyword=More EPR Calibration with Correction Coil Current ScanThere was lock-in output overflow during last EPR, and there are still
polarization drop during high energy state (probably due to massing).
Therefore, I did more EPR tests with 0.8A & 0.9A on correction coil.
As shown in High Energy State EPR Drift plots, there are obvious
polarization drop at high energy state with 0.5A in correction coil; this
effect is almost gone at 0.8A and gone at 0.9A. However AFP loss goes
higher as correction coil currents. To make sure there is no massing at
higher polarization, I set the final correction coil current to be 0.9A.
NMR at both 0.8A and 0.9A are calibrated:
== Test Condition ==
Cell: Moss
Oven Temperature: 230C
Field Direction: Transverse -
Laser Power: 3x25 COMET
Cell Density: 7.962 amg
Correction Coil: Small = 0.80A; Large = 0.00A
== K ==
Pumping Direction: Anti-Parallel
Data directory: C:\AyeD\EPR\Data\EPR_AFP_20090526_1214
Calibration Constant: 1.89 %/mV
Polarization: 54.86%
Field: 24.90 G
EPR Frequency Shift: 100.28 kHz
==================================================================
== Test Condition ==
Cell: Moss
Oven Temperature: 230C
Field Direction: Transverse -
Laser Power: 3x25 COMET
Cell Density: 7.962 amg
Correction Coil: Small = 0.90A; Large = 0.00A
== K ==
Pumping Direction: Anti-Parallel
Data directory: C:\AyeD\EPR\Data\EPR_AFP_20090526_1228
Calibration Constant: 1.90 %/mV
Polarization: 53.05%
Field: 24.90 G
EPR Frequency Shift: 96.99 kHz
A copy of this log entry has been emailed to: yqiang, rsubedi, jpchen
EPR FM
EPR AFP @ 0.8A
EPR Analysis @ 0.8A
EPR AFP @ 0.9A
EPR Analysis @ 0.9A
High Energy State EPR Drift @0.5A
High Energy State EPR Drift @0.8A
High Energy State EPR Drift @0.9A
