Detailed20Jan2009.ppt is a description of what I know and don't know about ME+1/2 and ME+1/3
| Chamber | Xdiff mm | Ydiff mm | Zdiff mm |
| ME+1/2_02 | 0.6223 | -2.59247 | -3.2914 |
| ME+1/2_08 | 2.8439 | -0.8991 | -0.1097 |
| ME+1/2_14 | 0.0017 | -0.025 | 0.5482 |
| ME+1/2_20 | -0.0775 | 0.34235 | -0.9652 |
| ME+1/2_26 | 1.5317 | -0.3478 | -2.0966 |
| ME+1/2_32 | 0.3379 | 0.3478 | -3.3554 |
| Chamber | dX mr | dY mr | dZ mr |
| Point | Dist (mm) | Dist (mm) |
| B=0T | B=3.8T | |
| PT1 | 145.061 | 148.993 |
| PT2 | 153.951 | 159.863 |
| PT3 | 152.968 | 157.59 |
| PT4 | 155.726 | 158.026 |
| PT5 | 148.72 | 151.41 |
| PT6 | 158.163 | 161.434 |
By MAB ASPD I mean the projection of the line through the two MAB ASPD sensor centers to the radius at which the distancemeter operates.
| Point | MAB ASPD | target | dowel | MAB ASPD | target | dowel |
| 0T | 0T | 0T | 3.8T | 3.8T | 3.8T | |
| PT1 | 6670.49 | 6640.49 | 6785.55 | 6668.14 | 6638.14 | 6787.13 |
| PT2 | 6658.98 | 6628.98 | 6782.93 | 6657.61 | 6627.61 | 6787.47 |
| PT3 | 6660.42 | 6630.42 | 6783.39 | 6658.69 | 6628.69 | 6786.28 |
| PT4 | 6663.71 | 6633.71 | 6789.44 | 6662.55 | 6632.55 | 6790.58 |
| PT5 | 6670.31 | 6640.31 | 6789.03 | 6666.26 | 6636.26 | 6787.67 |
| PT6 | 6674.11 | 6644.11 | 6802.27 | 6670.61 | 6640.61 | 6802.04 |
This is using the old Cocoa transfer point description of the distancemeter dowel. This description does not agree with the CAD drawings I have. I include the results (larger chi-squared!) for ideal geometry with the CAD position of what I think the reference dowel pin position is for the distancemeter.
| Point | 0T target | 0T DM | ideal target | ideal DM | Rev. target | Rev. DM |
| PT1 | 6640.49 | 6785.55 | 6625.9839 | 6790.8065 | 6631.0203 | 6799.0934 |
| PT2 | 6628.98 | 6782.93 | 6627.9776 | 6794.1236 | ||
| PT3 | 6630.42 | 6783.39 | 6625.1137 | 6789.3688 | ||
| PT4 | 6633.71 | 6789.44 | 6625.1138 | 6789.3694 | ||
| PT5 | 6640.31 | 6789.03 | 6627.9999 | 6794.1606 | ||
| PT6 | 6644.11 | 6802.27 | 6627.9998 | 6794.1605 |
I am not sure why PT6 is so far out of line. Possibly there's some misplacement of the target.
Modified 19-January-2009 at 16:49
http://hep.physics.wisc.edu/~jnb/cms/19Jan2009
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