Current estimates for chamber Z and tilt. ME+1/2 values come from Celso--mine are slightly different, presumably due to a pulling by the MAB measurement at the outer edge of the disk. This is not complete for the plus side, nor is it final.
The Minus side bending is similar to the Plus side
Basic sanity check passed: Agrees with idealMuon geometry to within 20mm. I have been throwing around a 84.133mm shift to get our chamber centers to agree with the database definitions.
Misc notes: ME+3/PT6 Z1 is worthless in CRAFT09, as Oleg pointed out. ME+3/PT3 Z1 is OK through Run51, but nothing afterwards: which means there is no 3.8T data.
In addition, ME+3/PT5 Z1 looks bad, and ME-3/PT4 Z1 doesn't look like it matches the rest. So I do some averaging.
The sum of Z-sensor distances from station to station changes between R56 and pre-CRAFT. The value at R56 minus preCRAFT looks like
| Interval | Plus | Minus |
| ME1 to ME2 | 1.98 | 1.95 |
| ME2 to ME3 | 0 | -.17 |
| ME3 to ME4 | 1.68 | 2.68 |
Now the IR sensors on the Minus side cannot be located accurately for points PT1 and PT3, and in addition the PT2 measurement seems badly out of line for unknown reasons.
Interpolations were done using stationrings.gp with Pari/GP.
Modified 25-October-2009 at 22:55
http://hep.physics.wisc.edu/~jnb/cms/25Oct2009
| Previous notes | Next notes | Main slide directory |