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Calibration of Calibration of Analog Alignment SensorsAnalog Alignment Sensors
Status – February 2005Status – February 2005
M. Hohlmann, G. Karagiorgi, M. Ripert
Florida Tech
USCMS EMU meeting – UC Davis, Feb 25/26, 2005
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Progress overviewProgress overview
Total in System
Calibrations completed
To do
R-sensors 84 12 72
Z-sensors, resistive
Z-sensors, optical
72
12
12
-
60
12
Clinometers 48 - 48
Note: All R- and Z-sensors for ME+2 are now calibrated
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Calibration procedureCalibration procedure• Moved calib. bench to new lab; recommissioned• Subject each sensor to 5 calibration runs• Remove sensor mounts between runs to reestablish
absolute initial distance with reference bars • Distance ranges covered by calibrations
R1: 45.8 - 52.8 cm
R2: 22.9 - 32.0 cm; R2-Towers: 22.9 - 31.5 cm
Z: 2.9 - 4.3 cm
• Measure V(x), Vref for 80-110 data points per run
• Perform linear fits for V(x) and V(x)/Vref
• Calculate average slopes & intercepts w/ errors
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R-sensors R-sensors
4 types of prod. plates
2 types of prod. towers
R-sensor: wire extension pot.
R-sensor
Z-sensors
Linear mover
dowel pins for DCOP sensors
Stand
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R: Absolute Sensor R: Absolute Sensor Response vs. Distance V(x)Response vs. Distance V(x)
χ2 = 0.00985828
Fit line: V(x) = ax + b
V(x) = 2.0548x – 96.068
σ(a) = 0.000657
σ(b) = 0.0325
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Calibration recordCalibration record
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R: Sensor-to-sensor variation R: Sensor-to-sensor variation of slopesof slopes
Gauss fit:
mean = 2.0435 V/cm σ = 0.0175 V/cm
= 0.86 % σ
mean
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R: Sensor-to-sensor variation R: Sensor-to-sensor variation of slopes – zoomed inof slopes – zoomed in
Gauss fit – R1:
mean = 2.0601 V/cm σ = 0.0044 V/cm
= 0.22 % σ
mean
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R: Rel. errors on slopesR: Rel. errors on slopes
Gauss fit:
mean = 0.021 % σ = 0.015 %
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R: Sensor-to-sensor variation R: Sensor-to-sensor variation of y-interceptsof y-intercepts
= 1.12 %
Gauss fit – R2:
mean = 52.9980 V σ = 0.5924 V
σ
mean
= 0.41 %
Gauss fit – R1:
mean = 96.2098 V σ = 0.3955 V
σ
mean
Abs ( )
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R: Rel. errors on y-int.R: Rel. errors on y-int.
Gauss fit:
mean = 0.030 % σ = 0.017 %
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R: VR: Vrefref variation variation
= 0.012 %
Gauss fit:
mean = 11.1591 V σ = 0.0012 V
σ
mean
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R: Slopes of V(x)/VR: Slopes of V(x)/Vrefref fits fits
= 0.16 %
Gauss fit – R1:
mean = 0.1845 cm-1
σ = 0.0003 cm-1
σ
mean
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Z-sensor response V(x): Z-sensor response V(x): Slight non-linearity confirmedSlight non-linearity confirmed
χ2 = 0.328559
Fit line: y = ax + b
y = -10.302x – 43.955
σ(a) = 0.0241
σ(b) = 0.09
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Z: Sensor-to-sensor variation Z: Sensor-to-sensor variation of slopesof slopes
Gauss fit:
mean = 10.3520 V/cm σ = 0.0649 V/cm
= 0.63 % σ
mean
Abs ( )
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Z: Rel. errors on slopesZ: Rel. errors on slopes
Gauss fit:
mean = 0.032 % σ = 0.016 %
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Z: Rel. errors on y-int.Z: Rel. errors on y-int.
Gauss fit:
mean = 0.019 % σ = 0.007 %
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Z: Slopes for V/VZ: Slopes for V/Vrefref fits fits
= 0.62 %
Gauss fit:
mean = 0.9273 cm-1
σ = 0.0058 cm-1
σ
mean
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Clinometer calibrationClinometer calibration
Mechanics finalized Mirror
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Clinometer calibrationClinometer calibration4
3
2
1
0
Sen
sor
Res
po
nse
[V
]
-10 -8 -6 -4 -2 0 2 4 6Angle [deg]
'Sensor Response [V]' y = 2.249 'fit_Sensor Response [V]'
Response is ΔV ~ 1V per 4 degrees
Readout for Level Position is ~ +2.25V
(nominal is +2.50 V)
Production clinometer
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Clin.: Cross-calibrationClin.: Cross-calibration
6
5
4
3
2
1
An
gle
(d
eg)
0.50.40.30.20.1Distance cm
Phi_geometry 'Phi_geometry1' Phi_measured fit_Phi_geometry
[ ]Translation
Needs better understanding – under study…
Angle from directLaser measurement
Angle from geometriccalculation – method 1
Angle from geometriccalculation – method 2
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Comment on Comment on Alignment SoftwareAlignment Software
• Contacted Muon Barrel alignment colleagues
(Pedro Arce & Teresa Rodrigo) & Mike Case
• Not much apparent progress on alignment databases (calibration data; COCOA alignment output data for ORCA muon reco)
• CMS databases appear to be ill-defined for alignment purposes at the moment
• Will stay in the loop with barrel colleagues…
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Summary & OutlookSummary & Outlook
• Calibration of R-sensors and Z- sensors well
under control. Keep on calibrating…
• R- and Z-sensors for ME+2 ready for
shipping and installation on disk
• Clinometer calibration needs some more
studies before routine calibrations can start
• Dig deeper into software side of alignment…
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Loosely related newsLoosely related news
We’re moved in !!!