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Hi Cameron,
Thanks for taking a look at this presentation. I’ll take a look at the new detectors and post my findings.
It would be very useful if you would run the alignment over runs 753 and 754 using the wire positions as beamspot constraints, viz.
01753 SVT beamspot at (0.0, 0.2, 34.544)
01754 SVT beamspot at (0.0, 0.2, 20.600)
You can either accept all good electron and positron tracks and fit without a momentum constraint or you can align using only FEEs and impose the momentum constraint,
but take note of the structure in the top electron momentum spectrum shown on slide 3. I believe that originates from FEEs on the positron side, so a first pass alignment without a momentum constraint might be needed there.
Thanks,
Norman
From: [log in to unmask] <[log in to unmask]>
On Behalf Of Bravo, Cameron B.
Sent: Wednesday, March 23, 2022 11:53 PM
To: Graf, Norman A. <[log in to unmask]>; [log in to unmask]; hps-software <[log in to unmask]>
Subject: Re: SVT Vertex Analysis
Dear Norman,
Thanks for the plots, these are interesting to me. I have added 3 detectors to the ali21 branch of hps-java.
I would love to see all these plots for all three of those detectors.
Thanks,
Cameron
From:
[log in to unmask] <[log in to unmask]>
on behalf of Graf, Norman A. <[log in to unmask]>
Sent: Wednesday, March 23, 2022 10:46 PM
To: [log in to unmask] <[log in to unmask]>;
hps-software <[log in to unmask]>
Subject: SVT Vertex Analysis
Dear Colleagues,
As a follow-up to my analysis of FEE events which I presented at this morning’s analysis/recon meeting (https://confluence.slac.stanford.edu/pages/viewpage.action?pageId=341254335&preview=/341254335/341256282/20220322_CalibrationReconstruction_Graf_HPS_DAWG_Meeting.pdf)
I have reconstructed the data that was taken using the SVT positioning wires as targets. The positions of these wires are known to much higher precision than that of the tungsten target, and using both positron and electron tracks in the data should reduce
the systematics and improve the precision of the vertex measurement. I have posted a new set of slides summarizing the current state of this analysis to
https://confluence.slac.stanford.edu/pages/viewpage.action?pageId=341254335&preview=/341254335/341257564/20220323_SVTWireTargetVertexAnalysis_Graf_HPS_Weekly_Meeting.pdf . There are a number of interesting features in the data but the most interesting feature
for me is that the latest SVT geometry encapsulated in the HPS_Run2021Pass2FEE detector reconstructs the wire positions almost a centimeter downstream of their measured locations. I invite you to look at the slides and let me know if you have any questions
or suggestions on how to improve this analysis.
Sincerely,
Norman
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