installation_fp_sci
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installation_fp_sci [2017/06/20 17:16] pereira [Vent focal-plane chamber] |
installation_fp_sci [2017/06/22 11:58] pereira [Pumping focal-plane chamber] |
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| ===== Pumping focal-plane chamber ===== | ===== Pumping focal-plane chamber ===== | ||
| * Make sure that the pressure-relief valve and the manual vent valve (see above) are closed. | * Make sure that the pressure-relief valve and the manual vent valve (see above) are closed. | ||
| - | * Make sure that manual valve of the mechanical pump is opened {{: | + | * Make sure that manual valve of the mechanical pump is opened |
| - | * Open PanelMate **S800vac** and go to page 07. Make sure | + | * Open PanelMate **S800vac** and go to page 07. Make sure that the venting valve **I260VV** is closed (see last step of the [[#Vent focal-plane chamber|venting process]] described above) |
| * Select window **PUMPDOWN STATUS** and click on button **START PUMPDOWN**. The **PUMPDOWN STATUS** and **VENT STATUS** windows should display " | * Select window **PUMPDOWN STATUS** and click on button **START PUMPDOWN**. The **PUMPDOWN STATUS** and **VENT STATUS** windows should display " | ||
| - | | + | * 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). | ||
| + | * 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**. | ||
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installation_fp_sci.txt · Last modified: 2023/08/18 10:19 by noji
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