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| pld:start [2016/04/21 12:11] – james | pld:start [2016/12/08 14:23] – bethany |
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| {{:pld:thermionics_chamber_20150422.png|}} | {{:pld:thermionics_chamber_20150422.png|}} |
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| | {{PLD_process_schematic-ours.png|}} |
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| ==== Load Lock ==== | ==== Load Lock ==== |
| //Thermionics chamber//: 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. However, the gate valve to the main chamber will be automatically closed, which will prevent the chamber from venting to atmospheric pressure immediately. With the gate valve closed, the pressure should stay in the 10<sup>-7</sup> Torr range and very slowly increase until the system is reset. | //Thermionics chamber//: 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. However, the gate valve to the main chamber will be automatically closed, which will prevent the chamber from venting to atmospheric pressure immediately. With the gate valve closed, the pressure should stay in the 10<sup>-7</sup> Torr range and very slowly increase until the system is reset. |
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| If you discover that the power has gone out, make sure that the gate valve has closed (by the red indicator light if the power has been restored, or the white spot on the indicator beneath the gate valve motor is on closed). If the valve is closed, you can use {{:pld:reset_pld_thermionics2015.pdf|these instructions}} to restore the system. If the pressure is higher than 10<sup>-3</sup> or if the gate valve does not appear to have closed, then follow the Pump Down Procedures in the instructions (toggle switch up on silver panel, reset buttons on black panels, wait for the pressure to drop below 10<sup>-3</sup> Torr range, then restart Turbo Pumps). Here is a schematic for reference.{{:pld:control_tower.gif|}} | If you discover that the power has gone out, make sure that the gate valve has closed (by the red indicator light if the power has been restored, or the white spot on the indicator beneath the gate valve motor is on closed). If the valve is closed, you can use {{:pld:reset_pld_thermionics_2016.pdf|these instructions}} to restore the system. If the pressure is higher than 10<sup>-3</sup> or if the gate valve does not appear to have closed, then follow the Pump Down Procedures in the instructions (toggle switch up on silver panel, reset buttons on black panels, wait for the pressure to drop below 10<sup>-3</sup> Torr range, then restart Turbo Pumps). Here is a schematic for reference.{{:pld:control_tower.gif|}} |
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