Summary of calibration data
Rob Apsimon
P1 calibration results
Positive currents
21-05-09
Calib const
Chi^2
Ballistic cal1
2.085e-3 +/- 1.6021e-5
1.903
Ballistic cal2
2.0837e-3 +/- 1.9054e-5
Ballistic cal3
Ballistic cal4
Negative currents
Both
Calib const
Chi^2
Calib const
Chi^2
0.44171
2.1575e-3 +/- 1.167e-5
1.2455
2.1172e-3 +/- 7.7193e-6
1.0802
2.061e-3 +/- 1.8403e-5
0.52419
2.1719e-3 +/- 1.2104e-5
0.05981
2.1292e-3 +/- 7.989e-6
0.95878
2.0763e-3 +/- 6.8207e-5
7.045
2.1167e-3 +/- 1.4502e-5
6.0118
2.1119e-3 +/- 4.9195e-5
5.8933
2.3596e-3 +/- 1.1609e-6
11.5567
2.1889e-3 +/- 4.3984e-6
12.2966
2.2215e-3 +/- 2.9391e-6
11.6517
27-05-09
Ballistic cal1
Ballistic cal2
2.2953e-3 +/- 6.9756e-6
5.9097
NB. Only reliable calibration data is shown. No quads on data is shown since
the magnet K-values are not measured and so no reliable calibration can be
done.
The numbers in green denote that the points did not lie on a straight line, and it
looks like there is something strange going on.
2
P2 calibration results
Positive currents
21-05-09
Calib const
Chi^2
Ballistic cal1
2.2416e-3 +/- 6.3626e-6
5.9387
Ballistic cal2
2.1914e-3 +/- 1.0888e-5
Ballistic cal3
Ballistic cal4
Negative currents
Both
Calib const
Chi^2
Calib const
Chi^2
4.3412
2.2653e-3 +/- 6.8483e-6
1.3019
2.2266e-3 +/- 4.4779e-6
3.3633
2.134e-3 +/- 8.8539e-6
5.6157
2.2675e-3 +/- 9.1863e-6
0.15307
2.2176e-3 +/- 4.9754e-6
8.6604
2.226e-3 +/- 1.1991e-6
0.35873
2.0451e-3 +/- 2.0878e-5
10.8651
2.17e-3 +/- 8.3434e-6
5.0565
2.2508e-3 +/- 1.4596e-6
11.5567
2.0699e-3 +/- 5.9003e-6
10.7992
2.1307e-3 +/- 3.375e-6
27.6889
27-05-09
Ballistic cal1
Ballistic cal2
2.2707e-6 +/- 6.1585e-6
9.8687
The numbers in red denote that the processor was in saturation, which
explains the lower than normal calibration constants.
The numbers in green denote that the points did not lie on a straight line, and it
looks like there is something strange going on.
3
P3 calibration results
Positive currents
21-05-09
Calib const
Chi^2
Ballistic cal1
2.1218e-3 +/- 8.9312e-6
1.2843
Ballistic cal2
1.9577e-3 +/- 2.0887e-5
Ballistic cal3
Ballistic cal4
Negative currents
Both
Calib const
Chi^2
Calib const
Chi^2
2.4692
2.043e-3 +/- 9.0487e-6
0.78072
1.9789e-3 +/- 6.5083e-6
2.4355
1.9104e-3 +/- 1.6875e-5
2.495
2.0291e-3 +/- 9.6932e-6
0.26014
1.9746e-3 +/- 6.6807e-6
3.41
1.9608e-3 +/- 8.6592e-6
1.8238
1.7178e-3 +/- 1.7657e-5
19.5428
1.8976e-3 +/- 6.2356e-6
11.4779
2.3102e-3 +/- 1.2217e-6
53.1569
2.1138e-3 +/- 5.4307e-6
32.8563
2.1369e-3 +/- 3.02e-6
26.9121
27-05-09
Ballistic cal1
Ballistic cal2
2.2314e-3 +/- 5.3153e-6
13.2921
The numbers in red denote that the processor was in saturation, which
explains the lower than normal calibration constants.
The numbers in green denote that the points did not lie on a straight line, and it
looks like there is something strange going on.
4
Using corrector measurements
• Using the offset in the corrector as well as
the slopes allows us to fit all the calibration
on 1 line, the following slide shows an
example of this.
5
6
A quick look at QF9X calibration
• Firstly plot deflection in each BPM against BPM
distance from ZV6X using the calibration
constants calculated from the ballistic beam to
show the beam is straight through the BPMs.
• Using trig can work out the beam deflection at
the BPMs with and without the quad on and can
calculate the K-value of the quad indirectly, and
check with the value in Woodley’s model.
7
Calculate K to be ~0.0365-0.0375
Woodley’s model uses 0.0314
8