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installation_fp_sci [2019/07/01 09:45] pereira [Pumping focal-plane chamber] |
installation_fp_sci [2019/12/10 20:26] pereira [Vent focal-plane chamber] |
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Instructions on how to vent/ | Instructions on how to vent/ | ||
===== Vent focal-plane chamber ===== | ===== Vent focal-plane chamber ===== | ||
- | * Open the [[hv_bias|HV Remote Control]] GUI and ensure that the focal-plane detectors are unbiased | + | * Open the [[hv_bias|HV Remote Control]] GUI and ensure that the gas focal-plane detectors |
+ | * Make sure that the CRDC grid gate is off (HV is in dU6) | ||
+ | * Make sure that the CRDC preamps and interface boards are turned off (it is located in the NIM crate attached to the S800 focal-plane chamber) | ||
+ | * In order to avoid condensation from the cooling system, turn off the chiller sitting under the S800 focal-plane chamber. Wait for at least a couple of hours before venting the chamber. | ||
* Open the [[gas_handling_system# | * Open the [[gas_handling_system# | ||
* Ensure that the manual venting valve located on the south side of the chamber is closed (see figures below) | * Ensure that the manual venting valve located on the south side of the chamber is closed (see figures below) | ||
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* When pressure in the chamber (from **I261PG**) gets below 90 mTorr (at least 45 min), **I260RV** will close. | * When pressure in the chamber (from **I261PG**) gets below 90 mTorr (at least 45 min), **I260RV** will close. | ||
* Open the foreline valve **I260FV** using PanelMate box **Foreline vlve I260FV ** and clicking " | * Open the foreline valve **I260FV** using PanelMate box **Foreline vlve I260FV ** and clicking " | ||
- | * When pressure in the foreline (**I260PG**) is below 200 mTorr, turn on the turbo pump. You will see the speed increasing in the PanelMate box "I260TP speed" | + | * When pressure in the foreline (**I260PG**) is below 200 mTorr, turn on the turbo pump. You will see the speed increasing in the PanelMate box **I260TP speed** |
* It takes about 8 min to get the turbo pump "At Speed" (as read in box **Turbo pump focal plane detector I260TP**). During that time, the pressure in the focal-plane chamber will slowly increase (it is not being pump down) by few mTorr | * It takes about 8 min to get the turbo pump "At Speed" (as read in box **Turbo pump focal plane detector I260TP**). During that time, the pressure in the focal-plane chamber will slowly increase (it is not being pump down) by few mTorr | ||
* When the turbo pump is "At Speed" and pressure in the chamber (as read in **I261PG**) is below 175 mTorr, the turbo-pump gate valve **I260GV** will open | * When the turbo pump is "At Speed" and pressure in the chamber (as read in **I261PG**) is below 175 mTorr, the turbo-pump gate valve **I260GV** will open |