Prepare Frig for Polarization

Assumptions:

• NMR System is tuned
• Magnet is at full field, persistent mode, leads are ramped down
• Nose is over 50%, run valve in PID mode
• Baseline taken and set
• TE has been taken and new calibration constant feed into PDP
• Target in correct position along with NHR Channel setting
• Roughing and Bypass valve open with mechanical pumps on
• Beam Permit but no beam on target

Prepare Fridge:

• Close Roughing valve
• Turn on Blower 1 and wait 2 minutes
• Turn on Blower 2 and wait 2 minutes
• Close Bypass valve
• Turn on Blower 3
• Wait a little while

Begin Polarization:

• Press "TRANSMIT" on the microwave control panel under Control Unit Status (WARNING: Do not touch the button to the right)
• Press "Take Data" on PDP
• Try to maximize polarization by moving the bellows position
• Watch the frequency in the top left monitor
• You can try to start out in the frequency range in the plot of frequency vs Dose since last annel
• Generally you have to search for the "best" frequency When searching, make changes by 5MHz, 10MHz at the most
• After making a change, wait about 3 NMR updates to see if it helped/hurt
• Beam trips will change pol quickly and obscure the effect of your changes especially over 50nA
• If the frequencies display does not work look also at the poltarcama/Jpeg/CamImgs.jpg using Camera Set 0, use F5 to update (This shows in Hall bellows position)
• As radiation damage accumulates, frequency will move if polarizing positively, frequency will move down and if polarizing negatively, frequency will move up
• Use the logbook − see what frequencies worked for other people
• Log all of your best frequencies when you find them in the Target Operator Microwave Frequency Notebook
• Tell shift leader you are ready for beam