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[videbaek <videbaek AT bnl.gov>]

Hi All

I looked in some details on what we gotten from the survey group, and 
send around by Zhenyu.
I looked at whats called center of pins.

One observation:
The section two (middle ring) is done in reverse order, assume this is 
done to since model was rotated 30deg (or mirrored around the x -axis.

I added the data for P1-.. and P2.. in the attached spreadsheet, I will 
look at ring 3 later.
I calculated theRadius and Phi for the pin centers. There are systematic 
change with wedges, that can be
remedied by ofsetting the center by ~ -0.7 mm.
If I understand the center is determined by measuring points both on the 
Al-ring and the modules.
Overall RMS is 250 micro for the radius and 0.05 degree (~ 1mrad).
Both of these are (much) smaller than the delta(R) and delta(phi) of the 
strips.
I think the internal consistency , as measured in the clean room, is 
good; more important will likely be the position and rotations of the 
whole assembly when installed

best Flemming


I have a couple of questions.
To zhenyu.
What are the nominal position on the modules for the two pins (radius 
and phi say relative to centerline)?


- to the survey team
What is the difference between the
the sets P2_1-P2_12 and P2_13-P2_25:
It seems to be the same two pins but for a different distance?

What are P2_22-1 and P2_22-2?  Repeat measurements of P2_22?

Same question to point 1,2

+

On 2021-08-09 13:38, Zhenyu Ye wrote:
> Below are the questions I asked by email and answers I got by phone.
>
> > On Aug 9, 2021, at 10:06 AM, Zhenyu Ye <yezhenyu2003 AT gmail.com>
> > wrote:
> >
> > Hi Matt,
> >
> > Thank for performing the measurements and putting them into the
> > report. May I have a few questions on the results in the report, and
> > if possible some requests for additional results to be included in
> > the report?
> >
> > *********** *********** *********** *********** ***********
> > Questions
> >
> > 1. How were the coordinate systems in the report determined
>
> "Best match" of the measured positions (Al rings - referred to as
> ribs, and sensors) to the drawing we provided to him
>
> > 2. There are three tables "Clouds to Surface Faces Relationship"
> > 1) Clouds to DS RIB
> > 2) Clouds to US RIB
>
> These are the Al half rings
>
> > 3) Clouds to DS DETECTOR FACE
>
> Sensors
>
> > Can you please explain what each of these tables is for?
> >
> > *********** *********** *********** *********** ***********
> > Requests:
> >
> > 1. Tilted angles w.r.t. the Z axis
> > 1) Silicon sensors (dark blue wedge-shaped in the drawings on page
> > 1)
> > There are three sensors on each module. I understand that not all
> > sensors were measured for disk 1 and disk 3
>
> Yes
>
> > 2) Peek structures (UNDERNEATH the silicon sensors measured from the
> > reverse side of the sensor)
> > The sensors are mounted on wedge-shaped peek structures of each
> > module. I see from the drawing on page 1 of the report that you
> > measured those as well.
>
> Yes
>
> > 3) Aluminum half rings the modules on mounted on
>
> Yes
>
> > 2.  Positions
> > 1) Holes on the Aluminum half rings
>
> Yes, Three holes for each half from front, and three from back.
>
> > On Aug 7, 2021, at 9:38 AM, Zhenyu Ye <yezhenyu2003 AT gmail.com>
> > wrote:
> >
> > I am going to verify with him that the data included in the report
> > correspond to the pins on the modules.
> > I am also going to request for additional info
> >
> > 1. How the coordinate system is determined
> > 2. relative angles of the Silicon sensors in the coordinator system
> > 3. Positions of the holes on the support structures
> >
> > If you have anything in mind, please let me know.
> >
> > Zhenyu
> >
> > On Aug 7, 2021, at 9:26 AM, Zhenyu Ye <yezhenyu2003 AT gmail.com>
> > wrote:
> >
> > Begin forwarded message:
> >
> > From: "Ilardo, Matthew" <milardo AT bnl.gov>
> > Subject: RE: need for data from STAR surveys
> > Date: August 6, 2021 at 1:39:53 PM EDT
> >
> > Attached please find the report for the STAR Detector. It is subject
> > to change once the detector is installed as a single assembly in the
> > STAR magnet. These numbers are based on each half and how it relates
> > to the model for the detector. The model for the center array is
> > incorrect compared to the way the arrays are installed. Sorry for
> > the delay in processing this report.
> >
> > Matthew
> >
> > <BL DETECTOR REPORT.pdf><BR DETECTOR REPORT.pdf>
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--
Flemming Videbaek
senior scientist
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596

Attachment: Beam Right Report.xlsx
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