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| pld:start [2015/02/10 22:33] – james | pld:start [2015/09/29 13:55] – bethany |
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| The Thermionics chamber consists of two joined vacuum chambers, the main chamber and the load lock. The main chamber and the load lock are separated by a large gate valve which serves to isolate the two sections. The load lock and the main chamber are each served by two vacuum pumps, a turbo-molecular pump and a roughing pump working in series. | The Thermionics chamber consists of two joined vacuum chambers, the main chamber and the load lock. The main chamber and the load lock are separated by a large gate valve which serves to isolate the two sections. The load lock and the main chamber are each served by two vacuum pumps, a turbo-molecular pump and a roughing pump working in series. |
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| {{:pld:pld_thermionics_system.gif|}} FIXME - make this smaller | {{:pld:thermionics_chamber_20150422.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:pldthermionicsresetinstructions012915.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_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|}} |
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| ==== Windows ==== | ==== Windows ==== |
| There are many windows on the thermionics chamber. However, there are two UV grade laser windows. Each of these is mounted in a ConFlat flange. Each of the laser windows is made of fused silica, and measuring with the Coherent power meter, have a loss of approximately 10% at 248nm. | There are many windows on the thermionics chamber. However, there are two UV grade laser windows. Each of these is mounted in a ConFlat flange. Each of the laser windows is made of [[http://marketplace.idexop.com/store/SupportDocuments/MaterialProperties.pdf|fused silica]], and measuring with the Coherent power meter, have a loss of approximately 10% at 248nm. |
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| ===== Procedure ===== | ===== Procedure ===== |
| {{:pld:neocera.pld.instructions.pdf|Neocera Chamber}} | {{:pld:neocera.pld.instructions.pdf|Neocera Chamber}} |
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| {{:pld:gas_change_20120606.pdf|Laser Gas Change}} | {{:pld:gas_change_20150416.pdf|Laser Gas Change}} |
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| | {{:pld:PLD_viewing_window_cleaning_20150422.pdf|Chamber Window Cleaning}} |
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| FIXME | FIXME |
| Chamber cleaning procedures, viewing window cleaning procedures | Chamber cleaning procedures |
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| ===== Routine Maintenance ===== | ===== Routine Maintenance ===== |
| {{:pld:dbc2-12_chamber_darwing.pdf|Neocera 12" chamber drawing}} | {{:pld:dbc2-12_chamber_darwing.pdf|Neocera 12" chamber drawing}} |
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| | ===== Service ===== |
| | [[https://www.linkedin.com/pub/frank-cipolla/6/a2a/340|Frank Cipolla]], ONI Corp, (954) 296-0350, formerly of Lambda Physik, has worked on our laser. Very good service. |
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| | email is the best way to contact Frank, frank-cipolla@oni-corp.com |
