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venting_pumping_intermediate_image_box [2018/12/19 11:07]
pereira [Pumping Intermediate-image chamber]
venting_pumping_intermediate_image_box [2019/02/13 09:40]
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**
 +
 +==== Filling Intermediate-image delay PPAC with gas ====
 +  * 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 ion gauge I213IG is off
 +  * Verify that PPACs are in automatic mode with gas removed (**S3_Gas_Handling**)
 +        * 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 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) ​
 +  * 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"
 +        * 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
 +        * Valve V1 (Gas supply) will open, and V2, V3, and V6 (Chamber Bypass) will close
 +        * GH System status should indicate "Gas Flowing"​
 +        * I214CM Press Rdg will gradually increase to the set value
 +  * 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.txt ยท Last modified: 2019/02/13 09:40 by pereira