Calibration of Analog Sensors for the Alignment of Muon Chambers in the CMS experiment Marion Ripert, Georgia Karagiorgi, Thomas Moschoutis Dr. L. Caraway,

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Presentation transcript:

Calibration of Analog Sensors for the Alignment of Muon Chambers in the CMS experiment Marion Ripert, Georgia Karagiorgi, Thomas Moschoutis Dr. L. Caraway, Dr. M. Hohlmann Department of Physics and Space Sciences Florida Institute of technology Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Large Hadron Collider pp machine (mainly) 7 Times higher than energy in the Tevatron at Fermilab. Bunches of protons collide in CMS every 25 ns Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Endcap disks Outer barrel rings Central barrel ring The CMS solenoid will be 13m long with an inner diameter of 6m – the largest superconducting solenoid ever made! The Muon Detector Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Installation of muon chambers on ME+2 endcap Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

R – Sensor Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Z - Sensor Linear motion potentiometer Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Clinometer R-sensors Z -sensor Calibration of R, Z sensors and clinometers Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Recent Activities Calibration Bench finished for R sensors, Z sensors, and Clinometers Understanding & reducing uncertainties: -Reference bar accuracies -Mechanical Tolerance on dowel holes & pins -Mounting procedures Calibrating production sensors for ME+3 Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Line Up Reference points Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

remove plate from stand reestablish initial absolute distance with R-bar remount plate remeasure Results for R-sensors Results for R-sensors: Mean Fit line (30 measurements): y(x) = x σ(slope) = rms = σ(Y-intercept) = rms = Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Measuring relative changes in distances = ± (stat) V/cm Corresponds to σ Δx = 8 μm over full range (50 mm)  5 calibration measurements per sensor will be sufficient to achieve σ Δx = 20 μm over 50mm Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Measuring absolute distances : need new dowel holes. Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Checking the Calibration method : No dismounting and remounting of plates between measurement σ(intcpt) = V corresponding to σ(x) = 16 μm => It’s the holes, not the calibration method ! Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Results with new holes Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Random uncertainties: ( Dowel hole/pin tolerances, Initial absolute distance with reference bars ) ± 75 μm Systematic uncertainties: ( including calibration of stepper motor. Mechanical accuracy of reference bars. Non –parallel mover axis and line connecting R -post and dowel hole ) ≤ ± 150 μm Current uncertainties in absolute R calibration Total ≤ ± 150 μm Required: < ± 430 μm (from simulations) Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

Future Plan ME+2 : R and Z sensors ready for shipping and installation. Start mass calibration for R sensors and Z sensors, Inclinometers for ME+3,+4… Marion Ripert Florida Academy of Sciences, Tampa, March 18, 2005

References CMS, The Muon Project Technical Design Report. The CMS collaboration, CERN/LHCC Dick Loveless, EMU meeting at Carnegie Mellon,