Present : J.P. Chen S. Incerti S. Jensen (phone)
Discussion : NMR only - What has been done : * Parametrization of water signal amplitude dependence with T1 and method to extract T1 from our water calibrations (by S. I.) * Started study of Helium signal amplitude dependence with RF field (S. I.) * Started pick-up coils monitoring through Q curve history (S. I.) * Started water calibration studies with new water signal shape (K. S.) * Decided to used published T2 value for now - What needs to be done * Effect of T1<>T2 on water shape * Water calibrations * Temperature monitoring of water calibrations * Water signal vs target position * RTD monitoring during each run * RTD summary file for each NMR measurement (* YOUR HELP IS WELCOME *) * Rotation loss * AFP loss * Cover effect on NMR signal * Polarization loss in beam (depending on current, temp.,...) * Polarized target history vs time and vs current * Model of the water/helium target for absolute calibration and systematic studies * Temperature model of the target * Polarization and temperature gradients - Documents : Two new technical notes, accessible from our Web page : TN #20 : "Method to extract the water longitudinal relaxation time T1", by Sebastien Incerti, 2/1/99. Click here. TN #21 : "Magnetic field cartography of the Hall A 3He polarized target", by Alexandre Deur and Jian-Ping Chen, 2/2/99. Click here