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installation_fp_sci [2017/06/21 15:31] pereira [Pumping focal-plane chamber] |
installation_fp_sci [2018/04/11 16:11] pereira [Pumping focal-plane chamber] |
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===== 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 focal-plane detectors are unbiased | ||
- | * 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) | ||
* Ensure that the FP ion gauge (I264IG) is off (see details [[vacuum_control|here]]) | * Ensure that the FP ion gauge (I264IG) is off (see details [[vacuum_control|here]]) | ||
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* After the rough valve **I260RV** is automatically open, the mechanical pump will start pumping. | * After the rough valve **I260RV** is automatically open, the mechanical pump will start pumping. | ||
* The pressures in the mechanical pump (from **I259PG**) and beam chamber (from **I261PG**) will jump momentarily to very high values. They should go down slowly after few seconds (otherwise, the chamber is not properly closed). | * The pressures in the mechanical pump (from **I259PG**) and beam chamber (from **I261PG**) will jump momentarily to very high values. They should go down slowly after few seconds (otherwise, the chamber is not properly closed). | ||
- | * When pressure in the chamber (from **I261PG**) gets below 100 mTorr, **I260RV** will close. Foreline valve **I260FV** will open followed by the turbo gate valve **I260GV**. | + | * When pressure in the chamber (from **I261PG**) gets below 100 mTorr (at least 30 min), **I260RV** will close. Foreline valve **I260FV** will open followed by the turbo gate valve **I260GV**. |
- | * The pressures in the mechanical pump (from **I259PG**) and beam chamber (from **I261PG**) will jump momentarily to very high values. They should go down after few seconds | + | * Wait for few hours until vacuum is good. You can then turn on the ion gauge **I264IG** |
- | * Wait for some hours until vacuum is good | + | |
- | + |