[Primexd] [GlueX] Target installation plan

[Gan, Liping]

Hi, Matt,

Do you know if FCAL position has been changed since 2015 survey?

Liping

From: GlueX-Collaboration <gluex-collaboration-bounces at jlab.org> On Behalf Of Simon Taylor
Sent: Thursday, February 28, 2019 3:23 PM
To: Ilya Larin <ilarin at jlab.org>; Shepherd, Matthew <mashephe at indiana.edu>; Ashot Gasparian <gasparan at jlab.org>
Cc: primexd at jlab.org; andrsmit at jlab.org; GlueX Collaboration <gluex-collaboration at jlab.org>; Mark Stevens <stevensm at jlab.org>
Subject: Re: [GlueX] Target installation plan


For what it's worth, according to the 2015 survey (I am not sure if the FCAL was resurveyed at a later date), the FCAL as a whole is off in x by about +5mm, but only a tiny amount off from zero in y.



In the attachment the highlighted numbers are z,x,y in meters.









Simon

________________________________
From: GlueX-Collaboration <gluex-collaboration-bounces at jlab.org<mailto:gluex-collaboration-bounces at jlab.org>> on behalf of Ilya Larin <ilarin at jlab.org<mailto:ilarin at jlab.org>>
Sent: Thursday, February 28, 2019 2:58:38 PM
To: Shepherd, Matthew; Ashot Gasparian
Cc: primexd at jlab.org<mailto:primexd at jlab.org>; andrsmit at jlab.org<mailto:andrsmit at jlab.org>; GlueX Collaboration; Mark Stevens
Subject: Re: [GlueX] Target installation plan




 Hi Matt,



according to the pictures the square pipe is asymmetrical vs beam line

and is most likely causing the "shade" on ComCal face.

Wondering if  FCAL is placed symmetrically vs beam,

that should mean that pipe doesn't exactly match FCAL hole.

The exact values from drawings would help and needed for MC

geometry db to get an exact acceptance.

If it is the case, that only mean we have to reduce ComCal

fiducial region for Compton events.



 Thanks for pictures.



Ilya



________________________________
От: GlueX-Collaboration <gluex-collaboration-bounces at jlab.org<mailto:gluex-collaboration-bounces at jlab.org>> от имени Shepherd, Matthew <mashephe at indiana.edu<mailto:mashephe at indiana.edu>>
Отправлено: 28 февраля 2019 г. 12:49
Кому: Ashot Gasparian
Копия: primexd at jlab.org<mailto:primexd at jlab.org>; andrsmit at jlab.org<mailto:andrsmit at jlab.org>; GlueX Collaboration; Mark Stevens
Тема: Re: [GlueX] Target installation plan


Hi Ashot,

> On Feb 28, 2019, at 11:58 AM, gasparan at jlab.org<mailto:gasparan at jlab.org> wrote:

> Therefore, it would be extremely important to take pictures of the FCAL
> insertion part and post on some place to see, before our meeting this
> evening.


I've posted pictures of the FCAL insert here:

https://logbooks.jlab.org/entry/3661206<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flogbooks.jlab.org%2Fentry%2F3661206&data=02%7C01%7Cprimexd%40jlab.org%7Ce57a146ca16844a0e98c08d69dbc3b4f%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636869829109259174&sdata=2KXLE4iTAxdbN50XnHe3ANfIcjcJTrE5DA6R2QthS40%3D&reserved=0>

It looked today exactly as it did 5+ years ago when these were taken.  (I'm surprised you haven't taken a peek at it before as it defines the acceptance of your detector.)

The Plexiglas monitoring system is held in the groove on the upstream end.  Anything of any density should be clear of the inner opening in the tube.  From the darkroom all that is visible is what appears to be a thin tedlar cover on the upstream end.  It is needed for a light seal or else there is light path from the hall into the darkroom via the beam pipe.

Matt

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