S800 Documentation

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vacuum_control [2014/11/17 10:45]
pereira [Object Box] 		vacuum_control [2019/10/17 10:43] (current)
pereira [Object Box]
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-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, 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. +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 =====
  
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 **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. **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.
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 +
 ===== 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, potentially damaging 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.
vacuum_control.1416239135.txt.gz · Last modified: 2014/11/17 10:45 by pereira

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