Qweak Installation

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Information for installing the R1 chambers into Hall C

Installation Dates

Date Milestone
Planned (7/08) Completed
11/25/09 Qweak Install begins with Qtor
3/18/10 Install Rotator
3/31/10 install Region 1 Chamber
4/21/10 Survey Region 1 Chamber
7/22/10 Qweak Commission
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 angle [math]\theta[/math] if 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
(mm) (mm) (mm)
X 0.05 0.2 0.2
Y 0.05 0.2 0.2
Z 1 10 1
Yaw(about Y)
Pitch (about X)
Roll(about Z) [math]\infty[/math] [math]\infty[/math] [math]\infty[/math]

Survey marker locations

ChargeColecotr coordinates.png

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

Chamber Gases

Region II and III wil use gas mixture:

% Volume Gas
88 Argon
10 CO2
2 Methane

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