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installation_fp_sci [2015/05/04 13:06]
pereira [Closing focal-plane chamber] 		installation_fp_sci [2017/03/06 12:26]
pereira [Vent 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#labview_control_program|Labview gas handling system]] and verify that there is no gas in the CRDCs and IC. Open valves **4** (IC supply), **5** (IC bypass), **6** (IC focal-plane bypass), **20** (CRDC supply), **21** (CRDC bypass), and **22** (CRDC focal-plane bypass). The rest of the valves should be closed +  * Open the [[gas_handling_system#labview_control_program|Labview gas handling system]] and verify that there is no gas in the CRDCs and IC. Open valves **4** (IC supply), **5** (IC bypass), **6** (IC focal-plane bypass), **20** (CRDC supply), **21** (CRDC bypass), and **22** (CRDC focal-plane bypass). The rest of the valves should be closed 
-  - Ensure that the manual venting valve located on the south side of the chamber is closed (see figures below)  {{:wiki:fp-venting-valve-Daniel.jpg?350|FP chamber manual venting valve}} {{:wiki:fp-venting-valve.jpg?350|FP chamber manual venting valve}}  +  * Ensure that the manual venting valve located on the south side of the chamber is closed (see figures below)  {{:wiki:fp-venting-valve-Daniel.jpg?350|FP chamber manual venting valve}} {{:wiki:fp-venting-valve.jpg?350|FP chamber manual venting valve}} 
-  - Open PanelMate and select **S800vac** file in directory \\exp\files\control\ncsdata\General\Qt\Templates. Go to page 07, click on the **VENT STATUS** window and begin the venting procedure. The **VENT VALVE I260VV** window will turn red and display "OPEN". The pressure should remain constant because the manual venting valve is still closed +  * Ensure that the FP ion gauge (I264IG) is off (see details [[vacuum_control|here]]) 
-  - Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure below) increases by ~4 torr/min     {{:wiki:fp-pirani.jpg?350|FP chamber manual venting valve}} +  * Open PanelMate and select **S800vac** file in directory \\exp\files\control\ncsdata\General\Qt\Templates. Go to page 07, click on the **VENT STATUS** window and begin the venting procedure. The **VENT VALVE I260VV** window will turn red and display "OPEN". The pressure should remain constant because the manual venting valve is still closed 
-  - Wait until the chamber is vented (few hours). The **I261PG** Pirani Gauge should read atmospheric pressure. The window **VENT STATUS** in PanelMate should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display "PUMPDOWN STOPPED"+  * Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure below) increases by ~1 torr every 15 seconds (see figures below)  
 +{{:wiki:fp-pirani.jpg?350|FP chamber manual venting valve}}  
 +  * Wait until the chamber is vented (few hours). The **I261PG** Pirani Gauge should read atmospheric pressure. The window **VENT STATUS** in PanelMate should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display "PUMPDOWN STOPPED"
  
 ==== Open focal-plane chamber ==== ==== Open focal-plane chamber ====
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   - Before pumping the chamber down, make sure that the scintillator is properly connected. This can be done by biasing the detector and checking the signals, either from the scalers or with a scope. One should clearly see cosmic rays; if that is not the case, the phototubes are likely miss connected   - Before pumping the chamber down, make sure that the scintillator is properly connected. This can be done by biasing the detector and checking the signals, either from the scalers or with a scope. One should clearly see cosmic rays; if that is not the case, the phototubes are likely miss connected
   - In order to pumpdown the chamber, make sure that the manual vent valve is closed. Start manual pump to get a pressure below 50 mtorr {{:wiki:ManualValve-fp.jpg?350|Manual valve pump}}   - In order to pumpdown the chamber, make sure that the manual vent valve is closed. Start manual pump to get a pressure below 50 mtorr {{:wiki:ManualValve-fp.jpg?350|Manual valve pump}}
-  -  +  - Close the manual pump; open PanelMate **S800vac** and go to page 07. Select window **PUMPDOWN STATUS** and click on button **START PUMPDOWN**. The **PUMPDOWN STATUS** and **VENT STATUS** windows should display "PUMPDOWN IN PROGRESS" 
-  - +  - Wait for some hours until vacuum is good
installation_fp_sci.txt · Last modified: 2023/08/18 10:19 by noji

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