In this mode, the fridge level is should be maintained above the 'Heat Exchanger Bottom' (see the Purple curve on the top-left graph of the screenshot below), and the separator is kept at cold with 20slm return flow. IMPORTANT: If you see the Heat-Ex Top resistance (purple curve) starts increasing, then reduce the number of turns on the fridge run-valve using the "Fridge Valve Panel" VI on the CCP
If the system is currently on Hold Mode, then you can follow the steps for Transitioning from the Hold mode to the Production Mode
Configuration / Things to maintain
Microwaves | ON (see Microwave Operation page for instructions how to maintain the polarization) |
NMR | It should be on "Take Data" (check with the Target Expert on Shift if there are issues) |
Fridge |
|
Magnet | Ensure the magnet has enough LHe. Ensure Magnet LN2 level is above 50%, if not refill it. |
QT System |
|
Outlet FlowsOutlet Flows (nominal)
Outlet Flow (in slm) | Run Valve / Bypass Valve | How to check and control | |
---|---|---|---|
Fridge | Nominal 45slm (can be higher (depends on the microwave power + beam) | Fridge Run valve → 1 turn0.5 turns Bypass valve → CLOSED | How to control the Fridge Return flow |
Separator | 20 | N/A | How to control the Separator Return flow |
Magnet | ~7 (on pressure PID at 0.9 psi) | N/A | (link to a page) |
Other useful instructions:
Steps for Transitioning from the Production Mode to the Hold Mode
A sample screenshot of the fridge in the Production Mode
################# I think the links below are too much information for the Target Operator manual, can be suitable for the target expert manual ####
Conditions:
- Fridge parameters & valve positions when the fridge is in Production Mode
- QT system conditions when the fridge is in Production Mode
- Magnet conditions when the fridge is in Production Mode
- Cryo-control (CCP) parameters / conditions when the fridge is in Production Mode
- Microwave parameters / conditions when the fridge is in Production Mode
- Target Lifter conditions when the fridge is in Production Mode
- UVA-NMR conditions when the fridge is in Production Mode