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venting_pumping_intermediate_image_box [2018/12/19 11:22]
pereira [Filling Intermediate-image delay PPAC]
venting_pumping_intermediate_image_box [2019/02/13 09:40] (current)
pereira [Removing gas from Intermediate-image delay PPAC]
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   * [[#Vent Intermediate-image chamber|Venting Intermediate-image chamber]]   * [[#Vent Intermediate-image chamber|Venting Intermediate-image chamber]]
   * [[#Pumping Intermediate-image chamber]]   * [[#Pumping Intermediate-image chamber]]
-  * [[#Filling Intermediate-image delay PPAC]]+  * [[#Filling/Removing gas in Intermediate-image delay PPAC]]
  
 ===== General information ===== ===== General information =====
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-===== Filling Intermediate-image delay PPAC =====+===== Filling/Removing gas in Intermediate-image delay PPAC ===== 
 + 
 +{{:​wiki:​ghsiippacs.png?​1000|Gas Handling System of S800 Intermediate Image}}  
 Requirements:​ PanelMate files **S3_Gas_Handling** and **S800Vac** Requirements:​ PanelMate files **S3_Gas_Handling** and **S800Vac**
  
 +==== Filling Intermediate-image delay PPAC with gas ====
   * Verify that PPACs are not biased:   * Verify that PPACs are not biased:
         * Check that the detectors are unbiased by opening the [[HV bias|HV GUI]]         * Check that the detectors are unbiased by opening the [[HV bias|HV GUI]]
         * Notify the system of the bias-off state by selecting the "​I214BON_CONFIRM"​ box in **S3_Gas_Handling** and clicking "PP BIAS OFF CONFIRMED"​         * Notify the system of the bias-off state by selecting the "​I214BON_CONFIRM"​ box in **S3_Gas_Handling** and clicking "PP BIAS OFF CONFIRMED"​
 +  * Verify that ion gauge I213IG is off
   * Verify that PPACs are in automatic mode with gas removed (**S3_Gas_Handling**)   * Verify that PPACs are in automatic mode with gas removed (**S3_Gas_Handling**)
         * The "GH System Status box should read "Auto Mode Gas Removed"​         * The "GH System Status box should read "Auto Mode Gas Removed"​
-        * If gas is removed but the system is not in the automatic mode, consult the Beam Physicists or Device Physicist. This typically requires to verify that the system is in a controlled status. In particular, the "​I214BON_CONFIRM"​ box should indicate "PP BIAS OFF CONFIRMED",​ and the only that should be open in **S3_Gas_Handling** are the "Det Bypass"​ (V5) and "Chmbr Bypass"​ (V6)  +        * If gas is removed but the system is not in the automatic mode, consult the Beam Physicists or Device Physicist. This typically requires to verify that the system is in a controlled status. In particular, the "​I214BON_CONFIRM"​ box should indicate "PP BIAS OFF CONFIRMED",​ and the only valves ​that should be open in **S3_Gas_Handling** are the "Det Bypass"​ (V5) and "Chmbr Bypass"​ (V6); the rest of the valves (Gas Sup V1, Gas Lin Pmp Out V2, Flow Bypass V3, Det Return V4, and I214V_NCL (enable)) should be closed
   * Confirm that PanelMate box "​I214P_AUTO/​MAN Pre Set" reads 5 Torr (the set gas pressure in the detector) ​   * Confirm that PanelMate box "​I214P_AUTO/​MAN Pre Set" reads 5 Torr (the set gas pressure in the detector) ​
 +  * Open the gas bottle valve (sitting near the gas handling system)
   * PanelMate box "Gas Flow Control"​ should indicate "OK to Start Gas Flow". Select that box and click on "Start Gas Flow"   * PanelMate box "Gas Flow Control"​ should indicate "OK to Start Gas Flow". Select that box and click on "Start Gas Flow"
-        *  +        * Valve V2 (Gas lin pmp out) will be opened and I214V_NCL will change from closed to "​ENABLED"​ 
-  *  +        Valves V3 (Flow Bypass) and V4 (Det Return) will open 
-  Open **S800Vac** and go to page 03 ("Intermediate image box vacuum system sec 15") +        Valve V1 (Gas supply) will open, and V2, V3, and V6 (Chamber Bypass) will close 
-  * Isolate chamber ​by closing gate valves ​**I212GV** and **I215GV** +        ​GH System status should indicate "Gas Flowing"​ 
-  [[Vacuum control|Turn off]] ion gauge **I213IG**  +        ​I214CM Press Rdg will gradually increase to the set value 
-  * Check box "PUMPDOWN STATUS INTERMEDIATE IMAGE BOX"​. ​It should ​read "Good vacuum" ​+  ​When the detector is filled, valve V5 (Det Bypass) will close 
 +        ​GH System status will indicate "Flow Estab."​ 
 +        * I214BON_CONFIM will change ​to "PPAC BIAS ASSUMED ON" 
 +        * The valves status will be: V1 (open), V2 (closed), V3 (closed), V4 (open), V5 (closed), V6 (closed), I214V_NCL (enabled) 
 +        * You can now turn on the detectors 
 + 
 + 
 + 
 + 
 +==== Removing gas from Intermediate-image delay PPAC ==== 
 +  * Verify that PPACs are not biased: 
 +        * Check that the detectors are unbiased ​by opening the [[HV bias|HV GUI]] 
 +        * Notify the system of the bias-off state by selecting the "​I214BON_CONFIRM"​ box in **S3_Gas_Handling** and clicking "PP BIAS OFF CONFIRMED"​ 
 +  ​Verify that PPACs are in automatic mode with gas flowing (**S3_Gas_Handling**) 
 +        The "GH System Status box should read "Auto Gas Flow Estab"​ 
 +        ​If gas is flowing but the system is not in the automatic mode, consult the Beam Physicists or Device Physicist. This typically requires to verify that the system is in a controlled status. In particular, the "​I214BON_CONFIRM"​ box should indicate "PP BIAS OFF CONFIRMED",​ and the valves should indicate: 
 +              ​I214 Gas Sup V1 (open) 
 +              ​Gas Lin Pmp out V2 (closed) 
 +              ​Flow Bypass V3 (closed) 
 +              * Det Return V4 (open) 
 +              * Det Bypass V5 (closed) 
 +              * Chmbr Bypass (closed) 
 +              * I214V_NCL (enabled) ​ 
 +  * PanelMate ​box "Gas Removal Control"​ should indicate "OK to Start Gas Removal"​. ​Select that box and click on "Start Gas Removal"​ 
 +        * Valves V1 (I214 Gas Sup) and I214V_NCL will close  
 +        * Valves V3 (Flow Bypass) and Det Bypass (V5) will open 
 +        * I214CM Press Rdg will gradually decrease to zero 
 +        * GH System status ​should ​indicate ​"Gas Removal" 
 +  * When the gas is removed from the detector 
 +        * Valve V3 (Flow Bypass) and 4 (Det return) will close 
 +        * Valve V6 (Chamber Bypass) will open 
 +        * GH System status will indicate "Gas Removed"​ 
 +        * I214BON_CONFIM will change to "PPAC BIAS ASSUMED ON" 
 +        * The valves status will be: V1 (closed), V2 (closed), V3 (closed), V4 (closed), V5 (open), V6 (open), I214V_NCL (closed) 
 +  * Close the gas bottle valve (sitting near the gas handling system) 
venting_pumping_intermediate_image_box.1545236520.txt.gz · Last modified: 2018/12/19 11:22 by pereira