| Both sides previous revisionPrevious revision | Next revisionBoth sides next revision |
| pld:start [2011/05/25 15:02] – chris | pld:start [2011/05/30 11:05] – jason |
|---|
| The BOC Edwards Turbo pump is an amazing, maintenance-free, wonder pump. This pump has a low pressure limit of 10^-9 Torr, and has magnetic bearings so that there is no hydrocarbon grease vaporizing into the chamber. If the turbine were to suffer an unbalanced build up of matter on it, changing its moment of inertia, the controller will modify the bearing properties along 5 axes (3 translational, 2 angular) such that the turbine always rotates about its center of mass in a balanced way. When the entire system is clean, this pump easily matches it's operating pressure specs, and at times surpasses them. | The BOC Edwards Turbo pump is an amazing, maintenance-free, wonder pump. This pump has a low pressure limit of 10^-9 Torr, and has magnetic bearings so that there is no hydrocarbon grease vaporizing into the chamber. If the turbine were to suffer an unbalanced build up of matter on it, changing its moment of inertia, the controller will modify the bearing properties along 5 axes (3 translational, 2 angular) such that the turbine always rotates about its center of mass in a balanced way. When the entire system is clean, this pump easily matches it's operating pressure specs, and at times surpasses them. |
| |
| | ====Power Outages==== |
| | The Thermionics chamber is set up so that in event of a power failure, the valves between the roughing and turbo pumps will remain closed and the pumps will not turn back on when power is restored. |
| | |
| | If you discover that the power has gone out while the pressure is still fairly low (10<sup>-3</sup> Torr), you can use these instructions to pump the system down. FIXME If the pressure is too high, then start the system up normally after restoring power to the pumps and TMP controllers (toggle switch up on silver panel, reset buttons on black panels - check fuses if nothing happens). |
| | |
| | The Edwards roughing pump on the main chamber frequently fails to start. If this happens, unplug it from the gray power strip and plug it directly into the wall. Let it run for a few minutes and then plug it back into the power strip and try to turn it on again. |
| |
| |
