Sphenix-calibration-l mailing list

[Ross Corliss <ross.corliss AT stonybrook.edu>]

Dear Charles, all,

Thank you for this update.  It looks like you've covered a LOT of ground and I'm sorry I couldn't be there in person to ask about it.

- regarding the 90-degree harmonics:  You are still plotting all 4/8 lasers in the same plot, I assume?  I'm fairly confident that the harmonics are an artifact of the different coordinate systems implicit in each laser.  There should be no harmonics for a plot that just has laser 1's perspective.

- Optimum angle looks like it's still good -- the doubled laser tracks are the ±fewº envelope, or?

- Was there any conclusion/discussion of the 3+6 o'clock configuration?  it does indeed look like it has a bad blind spot in the opposite corner.  Would 6 and 12, or 3 and 9, be better than two adjacent sites?

We can probably complete six lasers after all, in which case the blind spot is rotationally the same no matter which location we leave out.  In that case, it seems like 12 o'clock, which covers the TPOT least, is the sensible thing to leave out.  We may have to do some prioritization of which lasers are the most pristine, in which case I would lean toward the 3+6 sites as being the most important.

-Ross

==========
Dr. Ross Corliss
Research Assistant Professor
Center for Frontiers in Nuclear Science
Stony Brook University
virtual office:  https://stonybrook.zoom.us/my/rossoffice?pwd=ZmZ2SlRIMVFvUUJwbUkyOVNVTmE5QT09

On Feb 28, 2023, at 11:55 AM, Hughes, Charles [PHYSA] <chughes2 AT IASTATE.EDU> wrote:

Hello Everyone,

The Ad-hoc meeting just finished up.

I wanted to send around a copy of my slides for everyone to look at (they are also on the indico page).

Main updates:

1. Still working on determining relative pointing angle (slides 5-11) - Christof provided very helpful feedback this morning

2. Re-presented work on the optimum angle analysis from lte last week (slides 12 - 22). Also showed Luis' work on this (slides 19-20). Considered situation with lasers only @ 3 & 6 o'clock (see below).

3. Investigating clustering (slides 23-25). As Hugo suggested, it is in fact breaking.  Not sure why - discussed w/ Christof a bit:

<image.png>

<image.png>

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From: sPHENIX-calibration-l <sphenix-calibration-l-bounces AT lists.bnl.gov> on behalf of Ross Corliss via sPHENIX-calibration-l <sphenix-calibration-l AT lists.bnl.gov>
Sent: Tuesday, February 28, 2023 9:36 AM
To: sPHENIX-calibration-l <sphenix-calibration-l AT lists.bnl.gov>
Subject: [Sphenix-calibration-l] Ad-hoc distortions meeting today, 11am

 

Dear All,

We are finishing the direct lasers these next two days, so Evgeny and I will probably not be able to call in, but I think it's useful for those who are not as immediately tied up to call in.  The meeting page and zoom link are the same as always:

https://stonybrook.zoom.us/j/94081538941?pwd=Y256N3ptUC9zV2M4cjNtUGgyWnJYdz09 
https://indico.bnl.gov/event/18427/

Short report from here:  We have assembled 4 working eggs, with two more nearly done.  Bench alignment still needs to be done, but it is looking much more promising than the minimal configuration we discussed a few weeks ago.

-Ross

==========
Dr. Ross Corliss
Research Assistant Professor
Center for Frontiers in Nuclear Science
Stony Brook University
virtual office:  https://stonybrook.zoom.us/my/rossoffice?pwd=ZmZ2SlRIMVFvUUJwbUkyOVNVTmE5QT09

<20230228_TPC_Distortions_Meeting_Charles.pdf>