| Drift CHamber in forward spectrometer [message #8653] |
Tue, 26 May 2009 11:42  |
donghee
Messages: 385
Registered: January 2009
Location: Germnay
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first-grade participant |
From: *dip.t-dialin.net
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Dear Panda Family,
Where are exatly located DCH(Drift chamber) in forward spectrometer.
I couldn't find this info in the physics book.
In the histogram DchDigiProdcerHistos, which is produced in digitization, I found 9 timeing information(as histograms),
but first 3 histograms from 0 to 2 are empty, and other 6 histograms are filled.
I assume that DCH has 6 stations before dipole magnet and after dipole magnet.
Could you give some correction or useful figure to understand dch geometrical setup.
If you have a schematic view in y=0 plane,
that would be great.
Thank you!
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| Re: Drift CHamber in forward spectrometer [message #8657 is a reply to message #8653] |
Tue, 26 May 2009 12:07  |
Aleksandra Wronska
Messages: 38
Registered: May 2006
Location: Cracow
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continuous participant |
From: *if.uj.edu.pl
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Hi,
originally, there were two packs of dch foreseen for the target spectrometer as well. Now, after the GEMs have been introduced, they are not created anymore. So what's left are two chambers upstream the dipole, two inside of the dipole yoke hole, and two downstream the dipole.
Currently the chambers are located at z=305., 337., 418., 462., 615., 760. cm. However, the last position may change if we interchange the last chamber and the RICH detector - this has to be studied.
cheers,
ola
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Attachment: c1.jpg
(Size: 12.22KB, Downloaded 385 times)
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| Re: Drift CHamber in forward spectrometer [message #8663 is a reply to message #8661] |
Tue, 26 May 2009 12:47 |
Aleksandra Wronska
Messages: 38
Registered: May 2006
Location: Cracow
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continuous participant |
From: *if.uj.edu.pl
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Hi again,
you probably draw MCPoints from all detectors in one picture. Indeed, what you see at (0,0) is a beam pipe hole on the first chamber. The image of it on the detectors further downstream goes towards right because of the tracks deflection in the magnetic field.
cheers,
ola
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