Qweak Installation

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
5/20/10		Qweak Commission
9/6/10		Qweak Run 1
11/7/11		Qweak Run 2

Definitions

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

Tolorances

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

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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