BigBite Spectrometer

BigBite dipole magnet

• BigBite spectrometer front sieve slit plate, design drawing and a picture, as of 07/08/2008. X. Jiang

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", not the reality !!! 
   Updated by Susan Esp  10/28/2008. side view pdf file 

o  Closer to the reality, !!! still not the reality yet !!! after Al made some measurements on 10/28/208. 
   Update by Susan Esp 10/29/2008. side view pdf file 

• Drift Chambers

Shower/Preshower Detectors

• Shower + Preshower + Scintillator geometry

File:Shower.pdf

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.

Oct. 28, 2008

• Target survey report. Survey was done closer to Oct. 14th. pdf file