[BTeam] Bteam today.

[Mike McCaughan]

The BSY dump and associated BCM is potentially available to the BLA system on pass 2 if we unlock the supply (which means locking out the MBSY3C supply while we use it... yes, it's an exasperating configuration...). Given that we'll have been down for minimum of a month by the time we come back up I would remind everyone that we shouldn't be under the illusion things will come back quickly or easily necessarily. I would expect a cold startup with changes in gradient profiles etc as stuff happens when we are down for this long. Whether we start from first principle from eDT and the model, or iterate from the last setup is of course up for debate. I would personally campaign for the former given that we know we are having some loss issues we don't fully understand. Look forward to seeing you all this afternoon!
Mike

________________________________
From: BTeam <bteam-bounces at jlab.org> on behalf of Michael Tiefenback <tiefen at jlab.org>
Sent: Tuesday, April 7, 2020 9:17 AM
To: Yves Roblin <roblin at jlab.org>; bteam at jlab.org <bteam at jlab.org>
Subject: Re: [BTeam] Bteam today.

I recommend BLA system calibration using 1st pass beam to Hall C, for comparison against delivered current at higher pass and energy.  Would provide a more direct measurement of incremental pass-2 to pass-5 loss beyone pass-1 loss.  We _believe_ at present that pass-1 loss is small.

We ought also to know the duration of the planned run, in order to assess properly the setup trade-offs.

Michael Tiefenback

________________________________
From: BTeam <bteam-bounces at jlab.org> on behalf of Yves Roblin <roblin at jlab.org>
Sent: Tuesday, April 7, 2020 08:52
To: bteam at jlab.org <bteam at jlab.org>
Subject: [BTeam] Bteam today.

We will have a bteam today. I would like to start fleshing out the strategy to restart the machine so that we can get started developing a gant like last time.

 Amongst things to ponder :

1) Restart as is, just  check optics in injector and transverse optics in machine.

2) same as 1) but take time to characterize alternate arc1 optics

3) like 2) but decide to leave the new arc1 optics and rematch accordingly


Things we know we have to do :

 Transtition 4k to 2k
Assess/recover RF
Assess/tune injector
 Check high current setup/loss in east arc ( maybe go to bsy dump at pass 3, loss is enough to be seen at lower current) .
Recheck incoming arc opticdls
Validate beam parity quality

Let's come to the meeting and make a list.










Sent from my Verizon, Samsung Galaxy smartphone

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