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Re: Geometry of EMC Barrel Crystal [message #9416 is a reply to message #9415]

Fri, 18 September 2009 14:58

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Christian Hammann wrote on Fri, 18 September 2009 14:13

I was looking at crystal 5 in row 1 copy 1 of module 2 which should be a type 1 crystal.
These are the coordinates obtained by doing an inspect node on the root geometry created by the simulation:

Front face:
point #0 : x= -1.64783 y= -1.25634 z= -9.99926
point #1 : x= -1.64783 y= 0.88266 z= -9.99926
point #2 : x= 0.49055 y= 0.88266 z= -9.99926
point #3 : x= 0.49055 y= -1.25634 z= -9.99926

Rear face:
point #4 : x= -0.88418 y= -1.25633 z= 9.99926
point #5 : x= -0.88418 y= 1.63001 z= 9.99926
point #6 : x= 2.04146 y= 1.63001 z= 9.99926
point #7 : x= 2.04146 y= -1.25633 z= 9.99926

This gives a frontface of 21.4 by 21.4 mm which is about 1mm smaller than it is in the TDR. Also it should not be quadratic, (not even rectangular) according to the TDR.

The backface has a size 29.2mm by 28.9mm which more or less agrees with the TDR but it should also not be rectangular.

I have taken a look into the emc tdr, and I have found the numbers for crystal type 1. I compare the values (in mm) to what is present inside the pandaroot geometry definition:

Crystal  TDR    PandaRoot
AF:     21.21     21.38
BF:     21.28     21.39
CF:     21.27     21.38
AR:     29.04     29.26
BR:     28.75     28.86
CR:     29.12     29.26

There are some differencies, but everything is below 200um. Why do yo write "1mm smaller"?
I do not think 0.2 mm can change something, maybe it could be good to check also the position. I repeat, the numbers are coming from an old drawing and as far as I know it was not modified. Maybe comments from emc geometry experts are required.

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[Message index]

		Geometry of EMC Barrel Crystal By: Christian Hammann on Fri, 18 September 2009 12:43
		Re: Geometry of EMC Barrel Crystal By: StefanoSpataro on Fri, 18 September 2009 13:42
		Re: Geometry of EMC Barrel Crystal By: Christian Hammann on Fri, 18 September 2009 14:13
		Re: Geometry of EMC Barrel Crystal By: StefanoSpataro on Fri, 18 September 2009 14:58
		Re: Geometry of EMC Barrel Crystal By: Christian Hammann on Fri, 18 September 2009 15:12
		Re: Geometry of EMC Barrel Crystal By: Philippe Rosier on Tue, 06 October 2009 08:48

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