[Esr-users] Hall cryo recovery priority

[David Kashy]

Yes Chris,
This is what was decided yesterday evening with Rolf and Javier.

B gets throttled first
A gets throttled next if needed (hopefully we never get to this)
C gets throttled last (if we get to this there is a really big problem)

I see you have implemented the slight change that we discussed to start the throttling when the cold box output pressure (as read on PI671) goes
below 2.95 for Hall B,
below 2.90 for Hall A
below 2.85 for Hall C

and these are .05 less than yesterdays values which may help lower the number of throttles.

If possible (and if needed)  I think it would be good to lower each of these another 0.05.

Also you might want to increase the spacing.

So
2.90 for B
2.80 for A
2.70 for C

The other thing that could be helpful for stability is to increase the setpoint for the valve to the dewar (EV6761) from 3.05 to 3.1

Thanks
Dave




________________________________
From: Chris Perry
Sent: Friday, February 22, 2019 8:17 AM
To: Javier Gomez
Cc: Jonathan Creel; Rolf Ent; David Kashy; Patrizia Rossi; esr-users
Subject: Re: Hall cryo recovery priority


Javier,

   Just to be clear, with priority set to be C,A,B, I will set the controls so that B is throttled first followed by A then C.


-Chris


________________________________
From: Javier Gomez
Sent: Thursday, February 21, 2019 5:50 PM
To: Chris Perry
Cc: Jonathan Creel; Rolf Ent; David Kashy; Patrizia Rossi; esr-users
Subject: Hall cryo recovery priority

Hi Chris,

Rolf, David and I went over the impact of various scenarios if the flow of cryogens to Halls A, B and C must be throttled back - please set the hall priority to be C, A, B. We will update the order when the current experiment in Hall A, APEX, ends.

Thanks - Javier
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