[Pansophy] New DocuShare document routing task (Step 1 Completion): PLACLN-PR-VSA-CAV-PREP.docx

Wed Apr 28 12:26:59 EDT 2021

Comments have been incorporated – see highlighted text in the email chain below.  I also added the general warning from PLACLN-PR-VSA-CAV-MODE on the VTA/VSA radiation area.  The updated procedure PLACLN-PR-VSA-CAV-PREP has been added to the Ready for Approvals folder.  Please delete the current / disapproved version, move the updated procedure to the Approvals folder, and send the updated procedure version out for approval.

                New step 2.2 added and subsequent steps renumbered: The VTA / VSA is a radiation area when high power tests are being performed. In addition to flip signs indicating a change in state, the magenta beacons each shield lid are an indication that high power operation is enabled. Individuals who are not approved to be in the VTA / VSA during high power operation as per the VTA RWP are required to leave the area during high power testing.

Tiffany Ganey

From: Allen Samuels <samuels at jlab.org>
Sent: Tuesday, April 27, 2021 4:45 PM
To: Tiffany Ganey <ganey at jlab.org>
Cc: pansophy <pansophy at jlab.org>; Natalie Brock <nbrock at jlab.org>; Tom Powers <powers at jlab.org>
Subject: FW: New DocuShare document routing task (Step 1 Completion): PLACLN-PR-VSA-CAV-PREP.docx

Tiffany,

Sorry for dropping all this on you. Would you please revise this procedure and re-upload it to ready for approvals? Thanks.

Allen

From: DocuShare Workflow <docushare at jlab.org<mailto:docushare at jlab.org>>
Sent: Tuesday, April 27, 2021 3:22 PM
To: Allen Samuels <samuels at jlab.org<mailto:samuels at jlab.org>>
Subject: New DocuShare document routing task (Step 1 Completion): PLACLN-PR-VSA-CAV-PREP.docx

You have a new DocuShare document routing task:

Subject: PLACLN-PR-VSA-CAV-PREP.docx
Date: 04/27/2021 15:22:05

Step 1 Completion:

Tiffany Ganey, 04/12/2021 13:47:21 Approved:

Natalie Brock, 04/12/2021 12:39:10 Approved:

Tom Powers, 04/27/2021 15:22:03 Disapproved:

The gas cart drawing needs to be updated to include the relief valves at the RV after PGX should be removed.

Incorporated.  All gas cart drawings have been updated.

Page 14 The term is "lower end" not "bottom."  Also add a note that if the capacitance manometer is reading 1.1 Torr it means that it is over-range.
Incorporated on pages 8 and 14: “The lower end of the …range is …”

I am not sure what the manual says but tech support says it takes 30 minutes for the RGA to warm up.
I based the timeline on watching the RCA traces – it takes a couple hours for the lines to approach a baseline (“provide stable readings”).  This may be due to a combination of the RGA warming up and the system lines pumping down.  For example, if you look at Plasma0 data on 21Mar25, the RGA was turned off ~ 14:00 and the AMU 28 and 17 lines were “flat” by ~ 15:45.

Launching plasma main with the RGA selector switch on will turn on the RGA filament . . .
Bullet updated: Launching PlasmaMain with the RGA selector switch on will turn on the RGA filament. The RGA filament requires approximately 2 hours to warm up and provide stable readings.

Page 15.

9.6.2 Connect the camera to the ethernet switch, which is located in the computer rack.  Note that the Camera is a power over Ethernet (POE) device and will not function unless it is connected to a compatible network switch.

Step updated: Connect the camera to the Ethernet switch, which is located in the computer rack. Note that the camera is a power over Ethernet (POE) device and will not function unless it is connected to a compatible network switch

9.6.3 words about changing the camera to camera 0 or 2 if the software fails.

Step updated: Launch the Plasma Camera program and verify that Camera 1 is set to the Active Camera on the Setup tab. If the software fails, try switching the Active Camera to 0 or 2.

10.3 we should continue to pump on the 1/4" line until we are prepared to put gas into the line.  Keep the VN2 and main pump valve open.

The procedure was written to avoid the cavity being open to the gas cart pump to the extent practical.  If the top plate valve is open, the cavity should be pumped through the turbo cart. I rearranged the order of these steps to keep the gas cart pumping for longer.

1

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9

10

10.1   Verify:

·         Valve to the test stand turbo is closed and the cavity valve to the vacuum cart is open

·         Vacuum cart V17 is open and the RGA filament is warmed up.

·         The gas line wall valve is open.

·         The MFC valve is closed and that the gauge PGX is reading 0.1 Torr.

10.2   Set up the PlasmaMain graphs to monitor mass flow (MF), cavity pressure (PCav (Torr)), and %O2. Set one parameter to monitor on each graph and set the time scale on each graph to 0.2 hours.
10.2.1  Click on the first slot under "Plots" [see Figure 10‑a #1]. On the drop down menu, select the parameter to monitor.
10.2.2  Change the Number Hours [see Figure 10‑a #2]. Highlight the current Number Hours value and type in the number of hours to show in the graph.

Figure 10‑a: PlasmaMain Graph Setup

10.3   The Cavity Pressure, Mass Flow, and O2% can also be monitored from the PlasmaMain screen. See Figure 10‑a.

Figure 10‑b: Mass Flow Parameters to Monitor

10.4   Close the gas cart Main Pump valve and VN2.
10.5   Verify the gas line handrail valve is open and the 30-30 gauge on the VSA upper level handrail is indicating a vacuum.
10.6   Open the valve at the top plate between the gas supply line and the cavity.
10.7   Monitor the pressure reading on the Capacitive Manometer (PCav) and pump B.
NOTES:

·         The pressure readings may increase to approximately 5E-4 Torr on the capacitive manometer and in the 1E-5 Torr range on pump B.

·         The Turbo pump B pressure shall not be allowed to go up to the 1E-2 Torr range.

10.8   Fully open V22 while leaving V23 in its nominal operating position and close V21.
10.9   Fully open V13 while leaving V12 in its nominal operating position and close V11.
10.10Open the Ar and Ar/O2 tanks. Verify the tank regulators are set to 5 psi.
10.11If not done, open the gas cart valves VA1, VA2, VM1, and VM2.
10.12In accordance with the following substeps, slowly open the MFC Valve and begin the process of purging gas while keeping the mass flow below 35 SCCM and the pressure at or below the setpoint pressure.

10.12.6.1 and where ever else you use numbers for mass flow include units of SCCM.
Incorporated throughout

Throughout use a subscript on "O2"
Incorporated throughout

Approved once these changes are entered.

Tony Reilly, 04/12/2021 11:34:36 Approved:

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