Difference between revisions of "Qweak Installation"
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| − | The charge collector strips are less than 0.4 mm wide. But the concentric | + | The charge collector strips are less than 0.4 mm wide. But the concentric strips can give you a direct measurements of the <math>\theta</math> angle if they are properly alignment with the beam line. |
Revision as of 19:18, 7 May 2008
Information for installing the R1 chambers into Hall C
Target Date
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. But the concentric strips can give you a direct measurements of the angle if they are properly alignment with the beam line.
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) |