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Intro:

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

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highest pressure for RGA use: 7.6E-6 torr

[or, if you want to use faraday mode (but why would you want to do that?), max pressure = 5 x 10-4 Torr]

connection issues? see Computer Recognition of RGA

Gathering data:

double check:

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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-
  10
  • • 6 torr
• valve to RGA is open

heck, double check all valves!

software settings:

filament on

accuracy 6

electron multiplier

software settings:

connection issues? see Computer Recognition of RGA

open MKS Process Eye Professional  Image Added

Image Added

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

Image Added

• • • accuracy 6. green circle in above image
    • Multiplier 3 (the lowest pressure

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• • • option in the drop-down menu). red circle in above image
    • saving dataImage Added

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• • • 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

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) for official qualification judgement. Include:

• • 1. Cart number
    2. The pressure that the cold cathode gauge
reads as
• • 1. (CCG) read before data collection
stops
• • 1. stopped. 
    2. The data
file.  Found
• • 1. files, found here:
Image RemovedCart number
• • 1.  Image Added
       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