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
  

  Connectors for Pickup Coils
  ;
• The connector for RF coil is in the back side of the rack
  

  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

Window for NMR Frequency Sweep

:

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

do the following steps:

1. Run the program if it's not currently running;
2. Select Helium;
3. Press Load Default button;
4. Make sure that Holding Field is about 25 Gauss, Sweep range is 77 to 85 kHz;
5. Make sure that Save Data is pushed;
6. Set Number of Sweeps to 1;
7. Press Start button to start the sweep;
8. The program can be stopped anytime by hitting the Stop button, other wise it will automatically stop after desired sweeps finished;
9. 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;
10. Do not EXIT the program because it's monitoring the oven temperature.
11. 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.