Muon Endcap Alignment Analog Sensor Calibrations

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Muon Endcap AlignmentAnalog Sensor Calibrations
Software Update

• Samir Guragain, Marcus Hohlmann
• Florida Tech
• October 2005

USCMS EMU meeting Fermilab, Oct 21/22, 2005
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ME Alignment System
Transfer plate
Z-sensors
Clinometers
Note only small sample of analog sensors shown
R-sensors
DCOPS
To be featured in Physics TDR Vol.1
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Overview

• Update on analog sensors
• Final calibration results for two types of
  Z-sensors
• Final calibration results for Clinometers
• ME1 proximity (PX) sensors
• Software preparation
• Overall data flow
• To do list
• Plans for Magnet test

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Recent activities

• Built specialized calibration mounts for ME1 Z-,
  R-, proximity-sensors, ME4 R-sensors
• Calibrated all clinometers, Z-sensors and shipped
  to PSL/FNAL for mounting
• Initiated alignment software development
  activities during 1-month summer stay at LPC
• Graduated a CMS M.S. student
• (Marion Ripert, now working with Laszlo Gutay
  at Purdue)

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Progress update
Note Each sensor is sub- jected to 5 calibration runs Total in System Calibrations completed To do
R-sensors 84 60 24 (ME1,4)
Z-sens., potentiometers Z-sensors, lasers 72 12 72 12
Clinometers 48 48 (6 spare)
ME1 Proximity sensors 72 0 72
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Full set of Z-potentiometers Sensor-to-sensor
variation
Slopes lt 1 variation
Abs (
)
Note In the end, we will actually use fit
results for response relative to a reference
voltage V(z)sensor/Vref
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Full set of Z-potentiometers Relative errors
on slopes
Error on slopes
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ME1 Z-Laser sensors
Z-laser sensor (ME1)
Linear Mover (barrel)
IR laser beam
Z-potentiometer (link to ME2)
Diffusely reflective surface
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Typical Z-laser response (ME1)
Trial1 ME1-TP3-ZLB11
Slope 1.0062 (V/cm) Error in slope 0.00039
(V/cm)
Distance cm
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Full set of Z-lasers Sensor-to-sensor variation
Slopes 1 variation
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Full set of Z-lasers Relative errors on slopes
Error on slopes
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Typ. Clinometer response
Angle deg
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Full set of Clinometers Sensor-to-sensor
variation
in X
in Y
Slopes 6 variation
Note Pos. and neg. inclinations are fitted
separately each device has two
entries in each histogram.
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Full set of Clinometers Relative Errors on
Slopes
in X
in Y
Errors on Slopes 0.3
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Total Calibration Uncertainties
Final numbers for all sensor types

(specifications) R-sensors 100 µm (lt
430 µm) Z-sensors 55 µm (lt
1000 µm) PX-sensors 55 µm Clinometers
0.02o
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ME1 proximity sensors
Ready to perform calibrations
2 prox. sensors
Linear mover
Establish absolute reference distance
Prec. dowel pins
Precision reference bar
Calibrate 2 sensors simultaneously
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Road to Completion

• Calibrate deliver in this order
• ME1 PX sensors
• ME1 R sensor
• ME-1 PX sensors
• ME-1 R sensors
• ME4 R sensors
• Spare clinometers
• Document calibration project in CMS note

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Alignment Software

• July 05 While at LPC, initiated contact with
  Calibration, Alignment, Database (CalAliDB)
  working group
• leadership Lee Lueking (FNAL)
• Oliver Buchmüller (CERN)
• Now Tri-weekly meetings on alignment DB issues
• Muon Barrel Link people also participating
• attempt to unify alignment software for
• tracker and muon as much as possible
• Fl. Tech working with Lee Luekings group

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Data Structure Flow
As of October 2005
(auto-conversion of existing ascii geometry
from old COCOA version Pedro Arce)
CSC Alignment object contains chamber
offsets ?xi ?yi ?zi ?ai ?ßi ??i...
(Fl. Tech)
(Fl. Tech)
(Fl. Tech)
Magnet-off Photogrammetry Survey data
MUON TRACKS
(by hand Dave Eartly?)
(by hand - Fl. Tech)
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Integrated some analog sensors into COCOA
Note Sensor sizes greatly exaggerated for
visibility
SLM
z
DCOPS
R-sensors
Representations of R-sensors
front CSC
SLM reference
Visualization output from COCOA alignment model
back CSC
Samir Guragain, MH LPC July 2005
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To do list

• Produce COCOA version in CMSSW (P. Arce)
• Develop COCOA-IN COCOA-OUT (Fl. Tech
  tracker?)
• Transform calibration data, sensor data,
  geometry, survey data into database formats for
  use by COCOA
• Have started w/ strawman table for analog sensor
  calibration
• Need to verify nominal COCOA geometry against CAD
  files and actual nominal on-detector geometry
  (Fl.Tech D. Eartly)
• Understand COCOA performance for ME with magnet
  test data
• create alignment object as output for offline
  reco use

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Magnet test

• Main goal (in my opinion) Get good data !
• Mostly analyze it later
• Ensure that ME alignment system is fully
  instrumented and can be read out
• Planning to send Fl. Tech grad student Samir
  Guragain to CERN for 5-6 months in January 2006
  to help commission read-out
• get MO support from Giorgio to do so
• Magnet-off photogrammetry (Dave Eartly)

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Magnet test contd

• Test basic functionalities first
• Do the controls work (e.g. lasers for SLMs) ?
• Does the readout work?
• Do raw sensor readings make sense
• (magnet off vs. magnet on) ?
• Does the raw data get written out properly in
  event data format ?
• Suggested alignment exercise
• Move disks relative to each other and relative to
  barrel by few mm and detect with Z-sensors
• with magnet off (is this even possible?)

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Magnet test contd

• Output parameters from COCOA fits for
  reconstruction
• 6 parameters per chamber
• ?x, ?y, ?z displacements of chamber centers
• ?a, ?ß, ?? rotation of chambers
• Currently no plans to align at a lower level
  (strips, wires) with the hardware alignment
  system. Maybe later we can get more sophisticated
  once the basics are under control.

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Summary Outlook

• Calibration of Clinometers and Z- sensors done.
  Keep on calibrating R- and PX. Finish soon !
• Software side of alignment gaining momentum.
• Jump into it full-time as soon as hardware done.
• Lots to do.
• Help commission alignment DAQ at CERN starting
  early 2006.

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Loosely related news
Friday afternoon
Florida Tech