Intro:

this doc will walk you through starting up the RGA, gathering data, and sending it off for qualification.

It assumes you are using an MKS brand RGA.

(For information on how to use the vacuum components of the carts, see Vacuum Cart Operation page)

Gathering RGA data

first thing's first, double check:

      • valves between RGA and turbo are open
      • pressure is below 7e-6 torr

software settings:

connection issues? see Computer Recognition of RGA

open MKS Process Eye Professional 

      • filament on  (blue means off, red means on)

      • accuracy 6. green circle in above image
      • Multiplier 3 (the lowest pressure option in the drop-down menu). red circle in above image
      • saving data
      • must prevent the computer from falling asleep: open an image (any image) and put it on slideshow

(prevent sleep because sometimes when the computer sleeps it loses its connection to the RGA)


*TBD insert video of RGA startup*

overview of qualification process

Attach RGA cart to chamber in question.

keep valve between cart and chamber closed!

gather baseline data:

with valve between cart and chamber closed

gather at least 12hrs of data on the cart alone, note CCG pressure at the end of data gathering.

send baseline data to Peter Stefan for approval to valve in. 

gather chamber qualification data:

open the valve between cart and chamber

collect at least 12hrs of data, note CCG pressure at the end of data gathering.

send data sets to Peter Stefan for qualification. 

what data to send

Email data to Peter Stefan (and CC Brady Robertson) for official qualification judgement. Include:

      1. Cart number
      2. The pressure that the cold cathode gauge (CCG) read before data collection stopped. 
      3. The data files, found here: 
        1. gathered at accuracy 6
        2. for at least 12 hours
        3. in electron multiplier mode

Always go through Peter Stefan. He is the official arbiter of chamber qualification, and he must have the final say. If you do not do this, the chamber is not considered qualified from an administrative controls standpoint, and you will have seven years of bad luck. 





documents:

  1. LCLS Procedure for Vacuum Qualification RGA Scans

  2. MKS RGA hardware manual

  3. MKS RGA software manual

  4. Amanda's doc: RGA Cart Maintenance and Operation

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