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CALIFA-SiTracker-GLAD geometry conflict [message #20496]

Wed, 08 March 2017 16:26

Anna Corsi
Messages: 7
Registered: August 2016
Location: CEA Saclay

occasional visitor

From: 140.181.8*

Hello,

I find a conflict of geometry among the following detectors, as in attached picture.
detGeo.Add(new TObjString("GLAD"), new TObjString("glad_v13b.geo.root"));
detGeo.Add(new TObjString("CALIFA"), new TObjString("califa_17_v8.11_cc0.2.geo.root"));
detGeo.Add(new TObjString("STaRTrack"), new TObjString("startra_v16-300_2layers.geo.root"));

Could you tell me which detectors should be moved to simulate experiments with setup expected for 2018?

Thanks in advance.
Best regards,
Anna

Attachment: Capture d’écran 2017-03-07 à 4.39.08 PM.png
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Re: CALIFA-SiTracker-GLAD geometry conflict [message #20498 is a reply to message #20496]

Thu, 09 March 2017 19:25

Hector Alvarez Pol
Messages: 21
Registered: July 2015
Location: Univ. Santiago de Compost...

occasional visitor

From: *usc.es

Hi Ana,

last time I was testing the CALIFA position, it was correctly located with respect to the nominal target position.
If this is true, the magnet is misplaced by around half a meter in this geometry file.

For a fast check to determine if CALIFA is correctly centered, you could find where the origin is in your plot or simply visualize a reaction vertex...
the CALIFA barrel should be located as it is in the attached picture (side view).
A displacement of half a meter as it is shown in your pic would mean that the vertex could be located outside the Barrel.

Regards,

Attachment: 1211.jpg
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Re: CALIFA-SiTracker-GLAD geometry conflict [message #20508 is a reply to message #20496]

Mon, 13 March 2017 14:41

Michael Heil
Messages: 4
Registered: July 2015

occasional visitor

From: *gsi.de

Hello Anna,
here is my view of how to solve this problem: We used to have the target Position at x=0, y=0 and z=0 per Definition. The distance from the target position to the entrance flange of GLAD is 1062 mm. And Califa has also a nominal position relative to the target. If both are at this position there should be now overlap anymore.

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Re: CALIFA-SiTracker-GLAD geometry conflict [message #20526 is a reply to message #20508]

Tue, 14 March 2017 22:31

Anna Corsi
Messages: 7
Registered: August 2016
Location: CEA Saclay

occasional visitor

From: *fbx.proxad.net

Dear Hector and Michael,

Thank you for your replies.
In my understanding (see attachement) the GLAD position is such that the entrance flange is rather ~50 cm from the origin (target center), so it should be shifted downstream.
For information, the create_glad_geo file I used originally has DistanceToTarget = 350 (cm).

Best regards,
Anna

Attachment: Capture d’écran 2017-03-14 à 10.08.32 PM.png
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