Information for installing the R1 chambers into Hall C
|11/25/09||Qweak Install begins with Qtor|
|3/31/10||install Region 1 Chamber|
|4/21/10||Survey Region 1 Chamber|
|11/23/10||Qweak Run 1|
|4/11/11||Qweak Run 2|
- Survey tolorance
- The accuracy in the absolute location of an object
- Alignment Tolerance
- The accuracy of an object relative some other known object.
- "Would like to"
- desired alignment accuracy
- "Must have"
- Required alignment accuracy
- "Known to"
- desired survey accuracy
The charge collector strips are less than 0.4 mm wide. The concentric strips can give you a direct measurement of the electron scattering angleif they are properly alignment with the beam line.
The numbers below are just a Guess with no justification from a simulation or hand calculation.
Tolorance for GEM relative to the PRIMARY COLLIMATOR (2nd collimator)
Survey can pretend to do 50 micron resolution 200 micron resolution is no problem.
Survey marker tooling balls need 1/4 inch rods to mount prisms on. Should have at least 3, 1/4 holes on detector.
|Coordinate||"Would like to"||"Must have"||Known to|
|Pitch (about X)|
Survey marker locations
The coordinates given below are with respect to an arbitrary reference point identified by the cross hairs just below the label "B".
|Point||Design (x, y)(mm)||Hall-C (x', y') (mm)|
|A||5.025; 60||7; 0|
|B||16.4858; 26.485||18.45658; -33.515|
|C||88.497; 3.492||90.477; -56.508|
|D||246.999; -18||248.979; -78|
|E||295.005; 60||296.985; 0|
|F||246.991; 138||248.971; 78|
|G||88.500; 116.493||90.48; 56.493|
|H||16.493; 93.488||18.473; 33.488|
Region II and III wil use gas mixture: