Qweak Installation

Information for installing the R1 chambers into Hall C

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 beam line center

Coordinate	"Would like to"	"Must have"	Known to
	(mm)	(mm)	(mm)
X	0.2	0.4	0.2
Y	0.2	0.4	0.2
Z	1	10	1
Yaw(about Y)
Pitch (about X)
Roll(about Z)

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