S800 Documentation

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vacuum_control [2014/11/17 10:14]
pereira [General Information] 		vacuum_control [2019/10/17 10:42]
pereira [Venting analysis-line lower-dipole section]
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   * Page 7: **Vacuum section 19** corresponds to the **focal-plane chamber**. It is isolated from the rest of the beam line by gate valve I265GV. The ion-gauge monitoring the vacuum pressure in this section is **I264IG**   * Page 7: **Vacuum section 19** corresponds to the **focal-plane chamber**. It is isolated from the rest of the beam line by gate valve I265GV. The ion-gauge monitoring the vacuum pressure in this section is **I264IG**
  
-  * Page 13: This page displays the pressures read by ALL the ion gauges of the analysis line and spectrograph+  * Page 13: This page displays the pressures read by ALL the ion gauges of the analysis line and spectrograph (see figure below)
  
  
-{{:wiki:s800vac-pg16.jpg?800|PanelMate. File s800vac.ui, page 16}}+{{:wiki:s800vac-p16.jpg?950|PanelMate. File s800vac.ui, page 13}}
  
  
  
-The readout from the ion gauges in the S3 vault is available through the control system, but these gauges cannot be turned on and off remotely. They are switched on and off locally by pressing the **EMIS** button on their controllers, which are located in the S3 vault on the middle level in the electronics racks under the stairs to the top level. An ion gauge must be turned off by entering the vault before its beamline section can be vented.+The readout from the ion gauges in the S3 vault is available through the control system, but these gauges cannot be turned on and off remotely. They are switched on and off locally by pressing the **EMIS** button on their controllers, which are located in the S3 vault on the middle level in the electronics racks under the stairs to the top level (see figures below). An ion gauge must be turned off by entering the vault before its beamline section can be vented. 
 + 
 +{{:wiki:IMG_2991.jpg?350|EMIS controllers of S800 ion-gauges}} 
 +{{:wiki:IMG_2992.jpg?450|EMIS controllers of S800 ion-gauges under stairs to the top level}} 
 + 
  
 All vacuum sections in the in the S800 have automated control of venting and pumpdown that operates valves and pumps (but not ion gauges) in the right sequence with the appropriate delays. In beamline section containing detectors, this automated control must be coordinated appropriately with steps to protect detectors. All vacuum sections in the in the S800 have automated control of venting and pumpdown that operates valves and pumps (but not ion gauges) in the right sequence with the appropriate delays. In beamline section containing detectors, this automated control must be coordinated appropriately with steps to protect detectors.
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 The ion gauge for the [[Stations|Object station chamber]] vacuum system makes too much light for the object scintillator.  This ion gauge **I188IG** should be left off except when actually monitoring the vacuum level. The ion gauge for the [[Stations|Object station chamber]] vacuum system makes too much light for the object scintillator.  This ion gauge **I188IG** should be left off except when actually monitoring the vacuum level.
  
 +As stated above (see figure above), this ion-gauge can only be turned off "locally" by pressing the **EMIS** button on its controllers, which are located in the S3 vault on the middle level in the electronics racks under the stairs to the top level. 
 ===== Target Chamber ===== ===== Target Chamber =====
  
 The venting and pumping of the target area vacuum chamber is taken care of by the experimenters. Since this chamber is always shifting between different configurations, the status of the system as displayed on the PanelMate control page may not be reliable at any given time. The readout from the ion gauge should be fed into the PanelMate for either configuration.  The state display and the ability to control the two beamline gatevalves, I246GV and I255GV, should also be functioning in PanelMate for either configuration, but the interlock status display and the interlock functionality to protect from opening either gatevalve at the wrong time may not be set up correctly. The venting and pumping of the target area vacuum chamber is taken care of by the experimenters. Since this chamber is always shifting between different configurations, the status of the system as displayed on the PanelMate control page may not be reliable at any given time. The readout from the ion gauge should be fed into the PanelMate for either configuration.  The state display and the ability to control the two beamline gatevalves, I246GV and I255GV, should also be functioning in PanelMate for either configuration, but the interlock status display and the interlock functionality to protect from opening either gatevalve at the wrong time may not be set up correctly.
  
-**Important note**: Ensure that the experimenters never pump the chamber down if the spectrograph vacuum section is vented. The pressure gradient between both sections would "push" the structure of the spectrograph beam line towards the target chamber, producing critical damage in the bellows of the line.+**Important note**: Ensure that the experimenters never pump the chamber down if the spectrograph vacuum section is vented. The pressure gradient between both sections would "push" the structure of the spectrograph beam line towards the target chamber, potentially damaging the bellows of the line. 
 + 
 ===== Spectrograph ===== ===== Spectrograph =====
-This system is pumped with cryopumps. Please do not vent this section if the target chamber is under vacuum pressure. The pressure gradient between both sections would "push" the structure of the spectrograph beam line towards the target chamber, producing critical damage in the bellows of the line.+This system is pumped with cryopumps. Please do not vent this section if the target chamber is under vacuum pressure. The pressure gradient between both sections would "push" the structure of the spectrograph beam line towards the target chamber, potentially damaging the bellows of the line.
  
 ===== Focal Plane Box ===== ===== Focal Plane Box =====
vacuum_control.txt · Last modified: 2019/10/17 10:43 by pereira

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