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User name Sulkosky
Log entry time 17:20:56 on August19,2003
Entry number 111887
keyword=Correction Coils and NMR!
12:16 NMR with Septum at 348.5A, correction coil C at +1.9A and coil D at -1.9A.
12:20 NMR with Septum at 348.5A and all correction coils off.
12:29 NMR with Septum at 348.5A, correction coil C at +1.9A and coil D at +1.9A.
time Signal(mV) Coil C(Amps) Coil D(Amps) Width(mG)
12:16 14.95 +1.9 -1.9 72
12:20 17.32 0.0 0.0 56
12:29 14.32 +1.9 +1.9 77
Notes:
1.) Though the correction coils reduce the EPR AFP loss, they add an additional gradient that cause the NMR peak's width to widen, which in turn reduces the NMR peak height.
2.) Under the above conditions, the NMR calibration constant is no longer valid!!
3.) Using the above information, I can calculate a scaling factor to scale the NMR signal with correction coils on to correction coils off.
4.) During Spin Duality's running period, the scaling factor appeared to be constant for a particular setting of the gradient coils.
Scaling Factor = Signal(56 mG)/Signal(72 mG) = 1.158
14:47 NMR with Septum at 397.75A, correction coil C at +2.2A and coil D at -2.2A.
14:54 NMR with Septum at 397.75A and all correction coils off.
time Signal(mV) Coil C(Amps) Coil D(Amps) Width(mG)
14:47 13.10 +2.2 -2.2 77
14:54 15.57 0.0 0.0 56
Scaling Factor = Signal(56 mG)/Signal(77 mG) = 1.189