Transcript Gas Electron Multiplier (GEM) - a novel particle detector

Muon Endcap Alignment
Analog Sensor Calibrations
& Software Update
Samir Guragain, Marcus Hohlmann
Florida Tech
October 2005
USCMS EMU meeting – Fermilab, Oct 21/22, 2005
ME Alignment System
Transfer plate
Clinometers
Z-sensors
Note: only small
sample of analog
sensors shown
R-sensors
DCOPS
To be featured in Physics TDR – Vol.1
M. Hohlmann - EMU meeting at Fermilab
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
M. Hohlmann - EMU meeting at Fermilab
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)
M. Hohlmann - EMU meeting at Fermilab
Progress update
Note: Each sensor is subjected to 5 calibration runs
R-sensors
Total Calibrations
completed
in
System
84
60
To do
24
(ME1,4)
Z-sens., potentiometers
Z-sensors, lasers
72
12
72
12
Clinometers
48
48
(6 spare)
ME1 Proximity
sensors
72
0
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72
Full set of Z-potentiometers:
Sensor-to-sensor variation
Slopes:
< ± 1% variation
Abs (
)
Note: In the end, we will actually use fit results for response relative to a reference voltage: V(z)sensor/Vref
M. Hohlmann - EMU meeting at Fermilab
Full set of Z-potentiometers:
Relative errors on slopes
%
Error on slopes [%]
M. Hohlmann - EMU meeting at Fermilab
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 ME+1-TP3-ZLB11
Sensor Response vs Distance
Sensor Response (V)
2
0
Slope = 1.0062 (V/cm)
-2
Error in slope = 0.00039 (V/cm)
-4
12
14
16
Distance[cm]
(cm)
Distance
M. Hohlmann - EMU meeting at Fermilab
18
Full set of Z-lasers:
Sensor-to-sensor variation
Slopes:
± 1% variation
M. Hohlmann - EMU meeting at Fermilab
Full set of Z-lasers:
Relative errors on slopes
%
Error on slopes [%]
M. Hohlmann - EMU meeting at Fermilab
Typ. Clinometer response
Sensor Response vs Angle for + & - directions of ME+4 -15 deg X Clinometer
5.5
5.0
4.5
Sensor Response (V)
4.0
3.5
3.0
Positive Directions
2.5
2.0
Negative Direction
1.5
1.0
0.5
0.0
-0.5
-12
-10
-8
-6
-4
-2
0
2
Angle
Angle(Deg)
[deg]
M. Hohlmann - EMU meeting at Fermilab
4
6
8
10
12
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.
M. Hohlmann - EMU meeting at Fermilab
Full set of Clinometers:
Relative Errors on Slopes
in X
Errors on Slopes: 0.3%
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in Y
Total Calibration Uncertainties
Final numbers for all sensor types:
(specifications)
R-sensors
Z-sensors
PX-sensors
Clinometers
± 100 μm (< ± 430 μm)
± 55 μm (< ± 1000 μm)
± 55 μm
o
± 0.02
M. Hohlmann - EMU meeting at Fermilab
ME1 proximity sensors
2 prox. sensors
Linear mover
Ready to perform calibrations
Establish absolute reference distance
Prec. dowel pins
Calibrate 2 sensors simultaneously
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Precision reference bar
Road 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
M. Hohlmann - EMU meeting at Fermilab
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 Lueking’s group
M. Hohlmann - EMU meeting at Fermilab
Data Structure & Flow
Optical &
analog
sensor raw
data
Geometry
Database
Format: Event data
XML files
As of October 2005
CSC
data
(auto-conversion of existing ascii geometry
from old COCOA version – Pedro Arce)
COCOA:
COCOA
IN
Alignment fits
COCOA
OUT
(in CMSSW
framework)
(Fl. Tech)
(Fl. Tech)
CSC
“Alignment
object”
contains chamber
offsets
…Δxi Δyi Δzi
Δαi Δβi Δγi...
Offline
reco
POOL-ORA object
(Fl. Tech)
Optical &
analog
sensor
calibration
data
POOL-ORA object
(directly or via ascii)
Magnet-off
Photogrammetry
& Survey data
XML files (?)
(by hand - Fl. Tech)
Muon
Trigger
(by hand –
Dave Eartly?)
HLT, L1
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MUON
TRACKS
Integrated some analog
sensors into COCOA
Note: Sensor sizes greatly
exaggerated for visibility
SLM:
z
Visualization output from
COCOA alignment model
Samir Guragain, MH
LPC July 2005
M. Hohlmann - EMU meeting at Fermilab
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
M. Hohlmann - EMU meeting at Fermilab
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 M&O support from Giorgio to do so
• Magnet-off photogrammetry (Dave Eartly)
M. Hohlmann - EMU meeting at Fermilab
Magnet 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?)
M. Hohlmann - EMU meeting at Fermilab
Magnet 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.
M. Hohlmann - EMU meeting at Fermilab
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.
M. Hohlmann - EMU meeting at Fermilab
Loosely related news
Friday afternoon
Florida Tech
M. Hohlmann - EMU meeting at Fermilab