muon endcap alignment analog sensor calibrations & software update

Muon Endcap AlignmentMuon Endcap Alignment

Analog Sensor Calibrations Analog Sensor Calibrations

& Software Update & Software Update

Samir Guragain, Marcus HohlmannFlorida Tech

October 2005

USCMS EMU meeting – Fermilab, Oct 21/22, 2005

10/22/2005 M. Hohlmann - EMU meeting at Fermilab 2

ME Alignment SystemME Alignment System

R-sensors

Z-sensors

Note: only smallsample of analog sensors shown

ClinometersTransfer plate

DCOPS

To be featured in Physics TDR – Vol.1


OverviewOverview• 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


Recent activitiesRecent 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)


Progress updateProgress updateNote: 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, lasers7212

7212

Clinometers 48 48(6 spare)

ME1 Proximity sensors

72 0 72


Full set of Z-potentiometers: Full set of Z-potentiometers: Sensor-to-sensor variation Sensor-to-sensor variation

Abs ( )

Slopes:< ± 1% variation

Note: In the end, we will actually use fit results for response relative to a reference voltage: V(z)sensor/Vref


Full set of Z-potentiometers: Full set of Z-potentiometers: Relative errors on slopesRelative errors on slopes

%

Error on slopes [%]


ME1 Z-Laser sensorsME1 Z-Laser sensors

Linear Mover(“barrel”)

Z-laser sensor(“ME1”)

IR laser beamZ-potentiometer(“link to ME2”)

Diffusely reflectivesurface


Typical Z-laser response (ME1)Typical Z-laser response (ME1)Trial1 ME+1-TP3-ZLB11

Slope = 1.0062 (V/cm)

Error in slope = 0.00039 (V/cm)

-4

-2

0

2

Sen

sor R

espo

nse

(V)

18161412Distance (cm)

Sensor Response vs Distance

Distance [cm]


Full set of Z-lasers: Full set of Z-lasers: Sensor-to-sensor variationSensor-to-sensor variation

Slopes:± 1% variation


Full set of Z-lasers: Full set of Z-lasers: Relative errors on slopesRelative errors on slopes

%

Error on slopes [%]


Typ. Clinometer responseTyp. Clinometer response

5.5

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

-0.5

Sen

sor R

espo

nse

(V)

-12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12Angle (Deg)

Sensor Response vs Angle for + & - directions of ME+4 -15 deg X Clinometer

Negative Direction

Positive Directions

Angle [deg]


Full set of Clinometers: Full set of Clinometers: Sensor-to-sensor variationSensor-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.


Full set of Clinometers: Full set of Clinometers: Relative Errors on SlopesRelative Errors on Slopes

Errors on Slopes: 0.3%

in X in Y


Total Calibration Uncertainties

(specifications)

R-sensors ± 100 μm (< ± 430 μm)

Z-sensors ± 55 μm (< ± 1000 μm)

PX-sensors ± 55 μm Clinometers ± 0.02o

Final numbers for all sensor types:


ME1 proximity sensorsME1 proximity sensors

Linear mover

2 prox. sensors

Precision reference bar

Prec. dowel pins

Calibrate 2 sensors simultaneously

Establish absolute reference distance

Ready to perform calibrations


Road to CompletionRoad to Completion• Calibrate & deliver in this order:

– ME+1 PX sensors – ME+1 R sensor– ME-1 PX sensors – ME-1 R sensors– ME±4 R sensors– Spare clinometers

• Document calibration project in CMS note


Alignment SoftwareAlignment 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 Lueking’s group


Data Structure & FlowData Structure & Flow

Offline reco

CSCdata

MUON TRACKS

Optical & analog

sensor raw data

Optical & analog sensor

calibration data

COCOA:Alignment fits

(in CMSSW framework)

COCOAOUT

COCOAIN

CSC“Alignment

object”contains chamber

offsets…Δxi Δyi Δzi

Δαi Δβi Δγi...

Geometry Database

Magnet-off Photogrammetry

& Survey data Muon TriggerHLT, L1POOL-ORA object

(directly or via ascii)

POOL-ORA object

Format: Event data XML files

XML files (?)

As of October 2005

(auto-conversion of existing ascii geometry from old COCOA version – Pedro Arce)

(by hand – Dave Eartly?)

(by hand - Fl. Tech)

(Fl. Tech)

(Fl. Tech) (Fl. Tech)


Integrated some analog Integrated some analog sensors into COCOAsensors into COCOA

Samir Guragain, MHLPC July 2005

back CSC

front CSC

DCOPS Representations of R-sensors

SLM reference

z

Note: Sensor sizes greatly exaggerated for visibility

Visualization output from COCOA alignment model

R-sensors

SLM:


To do listTo 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


Magnet testMagnet 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 M&O support from Giorgio to do so

• Magnet-off photogrammetry (Dave Eartly)


Magnet test cont’dMagnet test cont’d• 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?)


Magnet test cont’dMagnet test cont’d• Output parameters from COCOA fits for

reconstruction:– 6 parameters per chamber:

• Δx, Δy, Δz displacements of chamber centers• Δα, Δβ, Δγ 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.


Summary & OutlookSummary & 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.


Loosely related newsLoosely related news

Florida Tech

Friday afternoon

muon endcap alignment analog sensor calibrations & software update

Documents

hohlmann emu meeting

uscms emu meeting fermilab

types of z

sensor types

slopes errors

sensor variationslopes

relative errors

sensor variation abs