NMR polarization measurement

• Turn off the lasers (3 or 4), rotate the magnetic holding field to the parallel configuration (if the field is in transverse mode).
• Make sure the target is in the Helium 3 (beam) position.
• Make sure you are in the parallel field configuration.
• Run the NMR Record Settings panel. Make sure you get the print out.
• Run the Current Monitoring panel. Print it at the end.
• Call MCC and tell them you are going to move the target down to the pick-up coils to measure its polarization. When the target is masked, move the target down to the pick-up coils.
• Print the RTD screen from the HAC X terminnal.
• Run the NMR Measurement panel and print it when completed.
• Move the target back to its beam position.
• Call MCC, tell them you have measured the polarization and that the target is back to its beam position. Be sure to follow the beam back procedure before sending the beam back to the target (beam position, raster on with a radius setting $r=2$mm, current less than 15 $\mu$A)
• Run the NMR Extract Polarization panel and print it.
• Staple the plots together and store them in the target binder.

Figure: Top view of the longitudinal and transverse Helmholtz coils used in the polarized $^3$He target setup. The RF coils are needed to perform NMR as well as EPR measurements. The 0$^{\circ}$ angle gives the incident electron beam direction. The dashed lines indicate the coils main axis, the long bold arrow indicates the holding field direction which can be rotated from 0$^{\circ}$ to 360$^{\circ}$. We also show the laser beam longitudinal and transverse directions.