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installation_fp_sci [2017/06/20 17:28] pereira [Pumping focal-plane chamber] |
installation_fp_sci [2019/07/01 08:22] pereira [Installation of focal-plane scintillator] |
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====== Installation of focal-plane scintillator ====== | ====== Installation of focal-plane scintillator ====== | ||
+ | In June 2019, a new Turbo Pump with magnetically-levitating bearings (Leybold MAG 2200iP) was installed in the S800 focal-plane chamber. This pump has a dry-N line connected to it that is purging continuously the bearings. This creates an extra pressure in the foreline, which must be pumping down continuously. Therefore, it is critical turn off the turbo pump whenever the foreline valve needs to be closed. | ||
+ | |||
+ | 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 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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===== 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 (there valve **I260RV** will be automatically opened in the next step) {{: | + | * Make sure that manual valve of the mechanical pump is opened (the valve **I260RV** will be automatically opened in the next step) {{: |
* 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) | * 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 " | ||
- | | + | * The vent valve **I260VV** and foreline valve **I260FV** will be automatically closed |
- | * Wait for some hours until vacuum is good | + | * 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 | |
+ | * 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**. | ||
+ | * Wait for few hours until vacuum is good. You can then turn on the ion gauge **I264IG** | ||
+ |