[BTeam] Hall A data from FFB and FF test

[HyeKyoung Park]

Replying to include people copied in the original message.

________________________________
From: Mike Spata <spata at jlab.org>
Sent: Friday, August 21, 2020 10:02 AM
To: HyeKyoung Park <hkpark at jlab.org>; bteam at jlab.org <bteam at jlab.org>
Subject: Re: Hall A data from FFB and FF test

It would be very helpful to have this data for 1C12 BPM and 2 vertical and 2 horizontal BPMs before the Arc. Can we see that?

Mike


--
Michael Spata
Deputy Associate Director
Accelerator Ops and R&D
Jefferson Lab
12000 Jefferson Avenue
Newport News, VA 23606
Cell: (757) 876-0528<callto:(757)%20876-0528>

________________________________
From: BTeam <bteam-bounces at jlab.org> on behalf of HyeKyoung Park <hkpark at jlab.org>
Sent: Friday, August 21, 2020 9:42 AM
To: bteam at jlab.org <bteam at jlab.org>
Subject: [BTeam] Fw: Hall A data from FFB and FF test



________________________________
From: Sanghwa Park <sanghwa at jlab.org>
Sent: Friday, August 21, 2020 9:32 AM
To: bteam at jlab.org <bteam at jlab.org>
Cc: HyeKyoung Park <hkpark at jlab.org>; Paschke, Kent Dieter (kdp2c) <paschke at virginia.edu>; Ciprian Gal <ciprian at jlab.org>
Subject: Hall A data from FFB and FF test


Hello all,

Thank you for the discussion this morning. Here is some information when we did the test with FFB system.
Please let me know if you need anything from us. We are happy to provide any information that would help.

I put the timestamps of our runs which would be useful for you to look at the archive.

We took two runs,
---------------------------------------------------------------------------------------------------------
run 7699:
Run start time: 2020-08-13 17:00:06
Run end time:  2020-08-13 17:44:58

"During" the run, we test (1) FF ON, FFB ON (2) FF ON, FFB pause. The plots below show the comparisons of BPM1Y. Note the vertical scale on the right plot.
On the right plot, x-axis is the entry number of our data, so it's time proxy. Each entry is for one helicity window at 120Hz.

Observation: With FF on, we see vertical jitter in our BPMs. The plots only show BPM1Y here but other BPMs saw it too.

[image.png]

---------------------------------------------------------------------------------------------------------
run 7700:
Run start time: 2020-08-13 17:46:26
Run end time:  2020-08-13 18:02:36

During this run, we test (1) FF OFF, FFB ON (2) FF OFF, FFB pause. BPM1Y comparisons plots are attached below.
Observation: whether we have FFB on or not, if FF is off we didn't see the large jitter anymore.

[image.png]
---------------------------------------------------------------------------------------------------------

Also, we observed that Hall A Compton central rate (backscattered photon, not background rate) behaves better with FFB and FF OFF. See https://logbooks.jlab.org/entry/3826851
The strip chat shows the compton central rate and FFB status.
Top graph is the Compton central rate. The bottom one is FFB status, =FFB ON, 0=FFB off.

Sanghwa (Hall A RC)

--
Sanghwa Park
Stony Brook University
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/bteam/attachments/20200821/e0e8e22a/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 751296 bytes
Desc: image.png
URL: <https://mailman.jlab.org/pipermail/bteam/attachments/20200821/e0e8e22a/attachment-0002.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 1054214 bytes
Desc: image.png
URL: <https://mailman.jlab.org/pipermail/bteam/attachments/20200821/e0e8e22a/attachment-0003.png>