Things to Keep your Eye On

• Make sure the cell is still intact. There are several ways of doing this:
  • Check the spectrometer rates. They will go down significantly if the target is missing.
  • If the spectrum on the Outgoing Laser Spectrum on the Target Operator screen suddenly increases in magnitude by a significant amount (over 20
  • RTDs 6 and 7 will go down significantly (over 10 degrees) if the cell explodes.
  If you think a cell exploded, turn off the lasers immediately and call the Target Expert.
• The oven readouts on the oven heater controller chassis located to the left of the target control computer.
  • Air Flow Meter - Measures the air flow into the oven. Seems stable at about 320. Should never be below 100. Should be looked at by an expert if it is below 200.
  • Oven Controller - There are two numbers on this control. The bottom number is the set point. The top one is the actual temperature of the oven. These two should be within a couple of degrees of one another. If there is significant deviation (20 degrees or more), it needs to be looked at by an expert. If the temperature is below 130 Celcius, the lasers should be turned off immediately. Note that when the lasers are turned on or off the temperature will be unstable for about ten minutes, but then will settle down.
  • Heater Temperture - The external temperature of the heating element used to heat the oven. Its there to make sure the insulation around the heater pipe is not burned or melted. It is generally around 160 C. If it gets above 200 then there is likely a problem and an expert should be called in. Visually inspect the top of the target with the Hall Camera to make sure you don't see any smoke or haze coming from the pipes.
• The RTD temperature sensors (read on the Target Operator screen or on the EPICS screen) should be stable when taking data and the lasers have been on a while. Turning the lasers on and off and moving to different positions will cause small changes in the temperature. The pumping chamber RTDs are usually around 160-170C with the lasers off and 180-200C with the lasers on. The target chamber RTDs are usually around 40-55C.
• The Helmholtz coil currents are displayed on the camera above the target control computer and also on the target control computer itself. Make sure at least one of the coils has a current around 7 (or -7) amps and the other is around zero. You can check which direction the field is in by consulting the table in 'Five things the target operator should know' section.
• The RF Current Monitor Oscilloscope should not have a sine wave displayed on it if you are not taking an NMR. If you see one, just hit the Signal On/Off button on the RF Excitation FG to the right of the target control computer.