Difference between revisions of "BigBite Spectrometer"
From Hall A Wiki
(→BigBite spectrometer layout drawings, with the electron detector package) |
(→BigBite spectrometer layout drawings, with the electron detector package) |
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o Magnet and detector relative to target center, with dimensions, in the "ideal position", but not the reality !!! | o Magnet and detector relative to target center, with dimensions, in the "ideal position", but not the reality !!! | ||
| − | Updated by Susan Esp 10/ | + | Updated by Susan Esp 10/28/2008. [http://hallaweb.jlab.org/experiment/transversity/wikifile/Big_Bite_Spectrometer_Sect_Oct28th.pdf side view pdf file] |
| + | |||
| + | o Closer to the reality, !!! but still not the reality !!! after Al made some measurements on 10/28/208. | ||
| + | [http://hallaweb.jlab.org/experiment/transversity/wikifile/Big_Bite_Spectrometer_Sect_Oct29th.pdf side view pdf file] | ||
* [[Drift Chambers]] | * [[Drift Chambers]] | ||
Revision as of 18:23, 4 November 2008
Contents
BigBite dipole magnet
Electron Package
Electron package layout drawings
o Detector package with dimensions, updated by Al Gavalya 10/27/2008. side view and top view
BigBite spectrometer layout drawings, with the electron detector package
o Magnet and detector relative to target center, with dimensions, in the "ideal position", but not the reality !!! Updated by Susan Esp 10/28/2008. side view pdf file
o Closer to the reality, !!! but still not the reality !!! after Al made some measurements on 10/28/208. side view pdf file
Gas Cherenkov Detector
Scintillators
Shower/Preshower Detectors
Position Survey
Sept 18, 2008
Notice: Terminology used in this section follows conventions of Hall A Tech Notes JLAB-TN-02-012:
BigBite Chamber center position are surveyed with laser markers and a hand held laser meter. Error could be between 1mm to 5mm.
- Center of 1st Chamber Outer Aluminum Plate in BigBite Target Coordinate System:
- X= -0.072m
- Y= unknown
- Z= 2.862m
- Bigbite Magnetic in BigBite Target Coordinate System:
- Front Shielding Plate @Z=1.154m
- At Beam Height, Edge of Bigbite Coil at Detector Side @Z=2.46m
Oct. 28, 2008
- This is the date on the survey report: Media:DT_A1191.pdf. The actual survey was done closer to Oct. 14th.
IMPORTANT NOTES:
o The electron detector stack was moved 9cm closer to the target on Oct. 24th. That change is not reflected in this survey.
