View source for Procedure for Longitudinal 3He Elastic Measurement



== NMR Fequency Sweep Procedure ==

 ''' Never do sweep in position other than ''3He'' and ''Pickup'' !!! '''
 ''' Never do sweep during target movement !!! '''
 ''' Never do sweep when temperature not stable !!! '''
 ''' Never do sweep during production !!! '''

Before an '''NMR Frequency Sweep''', check NMR RF coils, pickup coils and Lock-in trigger connections:
* The connectors for pickup coils are in the front side of the rack [[Image:pickup_connector.jpg|thumb|Connectors for Pickup Coils]]; 
* The connector for RF coil is in the  back side of the rack [[Image:rf_connector.jpg|thumb|Connector for RF Coil]];
* The connector for Lock-in trigger is in the back side of the top NMR lock-in amplifier and make sure it's connected to the cable labeled with '''Frequency Sweep'''; 
* The pickup coil cable connected to ''Upstream'' is labeled as '''Target 2''';
* The pickup coil cable connected to ''downstream'' is labeled as '''Target 3''';
* For '''Vertical''' direction, use
   * ''Transverse pickup''('''Target 4''') pickup coil for pumping chamber;
   * ''Longitudinal RF''('''Target 5''') RF coil;
* For '''Longitudinal''' direction, use
   * ''Transverse pickup''('''Target 4''') pickup coil for pumping chamber;
   * ''Vertical RF''('''Target 6''') RF coil;

Make sure the EPICS Daemon is runing, it can be found in:

  C:\AyeD\VI\Spin Flip\EPICS Daemon.vi

Then open the program for NMR frequency sweep[[Image:NMR_fequency.png|thumb|Window for NMR Frequency Sweep]]:

  C:\AyeD\VI\NMR\NMR_Fequency_v7.vi

do the following steps:
# Run the program if it's not currently running;
# Select '''Helium''';
# Press '''Load Default''' button;
# Make sure that '''Holding Field''' is about 25 Gauss, '''Sweep range''' is 77 to 85 kHz; 
# Make sure that '''Save Data''' is pushed;
# Set '''Number of Sweeps''' to 1;
# Press '''Start''' button to start the sweep;
# The program can be stopped anytime by hitting the '''Stop''' button, other wise it will automatically stop after desired sweeps finished;
# Once all sweeps completed, a report screen with a screen shot will automatically popped out, please save the screen shot into the picture folder on desktop;
# Do not '''EXIT''' the program because it's monitoring the oven temperature.
# Post a Halog entry with the descriptions of
   * Field direction
   * Which RF coil
   * Which pumping chamber pickup coil
   * At what target position
   * Taking time
   * Target Polarization
   * the screen shot you just saved.