Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
A. MeneguzzoPadova University & INFN
Each chamber of the Barrel Muon System of the CMS experiment equipped with the final front-end and Low and High Voltage boards is fully tested in each assembly site in a cosmic rays facility. The system allows to check in real time the perfomances and the quality of the chambers and of the local trigger devices.The behaviour of the chambers built in the Legnaro INFN National Lab is reported and compared with Test Beam results.
Validation and Performance of the CMS Barrel Muon Drift Chambers
with Cosmic Rays
Cosmic rays are free, have no schedule ,
illuminate uniformly, are in all production sites.....
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Barrel muon system
5 wheels30o sectors with 4 stations250 DT chambers
2.0x2.5 m2 (MB1)4.0x2.5 m2 (MB4)~2*105 channels
480 RPC chambers
MB1
MB2
MB3
MB4
V.Monaco – INFN Torino
8th IACTPP Conference, Como 6-10 October 2003
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
CMS Drift Tube Chambers
ABCD
tA
tB
tC
tD
“SuperLayer” (SL 2)(coord. in bending plane)
SL (non-bending plane)
honeycomb panel
SL 1
30 c
m
Within one SL 4 layers staggered by half a cell to solve L/R ambiguity
continuous lines represent electrodes dotted lines represent equipotential surfaces
S
g Ws a bb/a ~ .65
13mm
42mm
continuous lines represent electrodes dotted lines represent equipotential surfaces
S
g Ws a bb/a ~ .65
13mm
42mm
continuous lines represent electrodes dotted lines represent equipotential surfaces
S
gC Ws a bb/a ~ .65
13mm
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Muon system specifications
Muon identification(after >10 up to 2.4)
Standalone momentum measurement
Charge assignement(up to few TeV)
Trigger on single anddi-muons with variablePt threshold up to 2.1
Bunch crossing assignment
V.Monaco – INFN Torino
8th IACTPP Conference, Como 6-10 October 2003
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Laboratori Nazionali di Legnaro (padova): DT chambers construction
glue for I-beam
Final chamberHV & LV boards
LNL
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Barrel Muon : DT chamber requirements
First Level Trigger (Mean time technique on staggered layers)
• Bunch crossing identification
• Track segment reconstruction
Pt cut : sharp efficiency curve
•drift time vs position linearity in the cell
•100m precision on wire position within a SL
• <1mm betweenSL
•Resolution of 250mcell
• Max Efficiency •Minimum Noise level
Muon track parameter- muon ID coverage up to IhI=1.1
- momentum & charge assignementNoiseEfficiencyResolution Wire and Layer position accuracy SL position accuracy
we want to measure for each chamber
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Chambers and Trigger set up at LNL
Chamber under trigger test
Local Trigger CCB
Chamber under test
Cosmic Rays : trigger set-up
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Monitor and analysis SET UP
The DAQ system is developed within the TRIDAS project; it has been used in the Test Beam 2000 , 2001, 2003 and at ISR (stoking area for final checks of all DT chambers). G.Maron et al. LNL
MONITOR :on line analysis
–occupancy
-noise
-efficiency
-MT
-Event Display ORCA framework Sara.Vanini et al., PD
Data Base ObjectivityFlat File
N.Toniolo LNL
Analisys Off-line:
-track reconstruction
-trigger emulator
-ntuples production with
raw data and tracks information
ORCA framework P.Ronchese et al., Pd
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Cell and drift time distribution checks
Strips
Bad cathod
Drift timebad but it can be recovered
good
1800 V
-1200 V
3600V
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Noise
Noise of the channels
in all layers of a chamber of all chambers
20 Hz/m
channel
channel
channel
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Noise vs Hv and noise vs Th
Noise vs HV on the wire Noise vs FrontEnd Threshold
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Efficiency
cell efficiency in the layer efficiency inside the cell
1.00
0.96
wire
I-beamgeometrical inefficiency 1.2/42= 3% for normal tracks
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Dead angle= 90
Efficiency :angle & all chambers
Mean SL Efficiency
for the first 12 chambers
98% 99%
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Efficiency :diagnostic
Efficiency in a layer :last 8 cells low efficiency
Efficiency as a function of position inside the cells
No voltage on the cathods
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Mean time fit with ‘time’
-the resolution and the resolution uniformity of the cells along the layer and in the SL
max T t2
t t MT34 2
34 2
t4t3
t2
t1
max
max
T/ V
T t2
t t MT
drift
23 1
123
d
d staggering
From the MeanTime distribution of the tracks in each semicolumn (semicell) we measure
-the wire position accuracy from the width of the distribution of the Mean
21000/ 380ns
Vdrift=55m/ns
Resolution=250m
= 1.6ns Wire position accuracy~70msemicolumn
max T t2
t t MT34 2
34 2
t4t3
t2
t1
max
max
T/ V
T t2
t t MT
drift
23 1
123
d
d staggering
Resolution mt=sqrt((2-trig_pm2) =3/2l
2
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
MT: Layer displacement
t = ( MT234R- MT234L) using the mean value of all MT234 ->good accuracyLayer 4 displacement -> x =t * vdrift
t1
d staggering
t3
t4
t2
t
t1
d staggering
t3
t4
t2
max T t2
t t M M23 1
123R 123L
T T
t1
d staggering
t3
t4
t2
t
t1
Tmax t2
t t MT34 2
234L
d staggering
t3
t4
Tmax t2
t t MT34 2
234R
t2
Mean 378 ns
Mean 383 ns
Example: layer 4 displaced of dx
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
MT : signal wire propagation
Measurement of the signal propagation along the wire
vsignal=0.244 m/ns
vdrift=21/378=0.55m/nsFEside
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
MT summary
Drift velocity in the cell
Accuracy on staggering and wire position
sm
Resolution in the cell
For all chambers
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
MT vs angle
angle angle
The apparent drift velocity grows with angle;it is constant for
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Super Layers alignment
x2
x1
All 4 point tracks, | < 20o
build 4 point segmentin each single SL
Extrapolate to themiddle plane of the chamber
62215 m
-3.80.1 mrad
before alignment corrections
MB3_12
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Layer alignement : 7 point fit residuals
SL 2
SL 1
MB3_12
<>=655 m
<>=395 m
<>=205 m
<>=-1755 m
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
2 fit vs SLs displacement
all but one layer included(before layer alignment)
all layers included
2 / NDOF
before layer alignment
after layer alignment
Layer 1excluded
after alignment corrections
8515 m
-0.50.1 mrad
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Plateau knee
Hit rate in SL1 is 3.5 (1.7 for SL 2) larger than theworst case at LHC(shown SL1)
CMS Note 2003/007
MB2 :TEST BEAM 2001 Resolution and
Drift cell effic.&resolutionWith increasing Background
192micron
192micron
DT Chamber performance in Test Beam
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
DT Chambers: 1st Level Trigger
****
****
***
****
**
***
*H
H
L
H
HL (LH)
H
N
Ho
*
*
***
*H
N
Hi
BTI outer
BTI inner
HHTRACOTSS/TSM
*
*
*
SL2 BTI outer
SL1 BTI innerH 4 points trackL 3 points track
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
First Level Trigger set-up: functionality tests with cosmic rays
The first final set up of the First Level Trigger has been tested on a MB3 chamber with a muon bunched beam at Cern in may 2003 (the test was successfully and preliminary results show perfect behaviour). The set up was first assembled and its functionaly checked at the assembly site in LNL. Here I presents the on line results of these first preliminary tests that showed us that the set up was correctly working. The real performance of the 1st Level Trigger have been studied on the test beam run and will come out soon. (Results of the performance of the BTI part of the 1st Level Trigger from Test Beam and with Magnetic field are in the CMS note01-051)
Bunch crossing identification
output triggers with 3(L) or 4(H) hits trigger tracks in each SL ->correlated trigger
Angle trigger
Angle track-450 450
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Bunched TB 2003 DTchamberTriggerPreliminary
~ 98-99 % efficiency up to 350
tracks hitting 2 I-beams
trig. at 14bxefficiency = total # of events
Event= scintillator + 2 hits in beam region
“EMULATOR” is a SW package that emulates the full chain of the TriggerChips and Boards. It works offline and need as input the times recordedby the TDCs. “Emulator “ is not the CMS simulation,it should reproduce exactlythe Trigger data. To compare with the expected performance as shown in the Trigger TDR we should compare with the full track reconstruction from TDC data.However this first result is in excellent agreement with what we expect.
Bunched TB 2003 DTchamberTriggerPreliminary
~ 98-99 % efficiency up to 350
tracks hitting 2 I-beams
trig. at 14bxefficiency = total # of events
Event= scintillator + 2 hits in beam region
“EMULATOR” is a SW package that emulates the full chain of the TriggerChips and Boards. It works offline and need as input the times recordedby the TDCs. “Emulator “ is not the CMS simulation,it should reproduce exactlythe Trigger data. To compare with the expected performance as shown in the Trigger TDR we should compare with the full track reconstruction from TDC data.However this first result is in excellent agreement with what we expect.
Bunched TB 2003 DTchamberTriggerPreliminary
~ 98-99 % efficiency up to 350
tracks hitting 2 I-beams
trig. at 14bxefficiency = total # of events
Event= scintillator + 2 hits in beam region
“EMULATOR” is a SW package that emulates the full chain of the TriggerChips and Boards. It works offline and need as input the times recordedby the TDCs. “Emulator “ is not the CMS simulation,it should reproduce exactlythe Trigger data. To compare with the expected performance as shown in the Trigger TDR we should compare with the full track reconstruction from TDC data.However this first result is in excellent agreement with what we expect.
~ 98-99 % efficiency up to 350
tracks hitting 2 I-beams
trig. at 14bxefficiency = total # of events
Event= scintillator + 2 hits in beam region
“EMULATOR” is a SW package that emulates the full chain of the TriggerChips and Boards. It works offline and need as input the times recordedby the TDCs. “Emulator “ is not the CMS simulation,it should reproduce exactlythe Trigger data. To compare with the expected performance as shown in the Trigger TDR we should compare with the full track reconstruction from TDC data.However this first result is in excellent agreement with what we expect.
~ 98-99 % efficiency up to 350
tracks hitting 2 I-beams
trig. atefficiency = total # of events
Event= scintillator + 2 hits in beam region
“EMULATOR” is a SW package that emulates the full chain of the TriggerChips and Boards. It works offline and need as input the times recordedby the TDCs. “Emulator “ is not the CMS simulation,it should reproduce exactlythe Trigger data. To compare with the expected performance as shown in the Trigger TDR we should compare with the full track reconstruction from TDC data.However this first result is in excellent agreement with what we expect.
Preliminary DT Trigger Performance - Sara Vanini SIF 2003
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
CONCLUSIONs
Noise <25 Hz/mEfficiency uniform 99% / layer cell layer vs phi angle vs theta angleResolution ~ ~ 250250/cell 100/cell 100/SL/SL
Mean Time: cell layer phi angle theta angle Layer position accuracy < 110 all Layers/SLall Layers/SLSLs position accuracy < 1mm linear fit Trigger tests with cosmic good
The results of the tests performed in the production site with Cosmic Rays of each Barrel Muon Drift Chamber of the CMS experiment are very good and confirms the 2000(cms note01-051) ,2001 (cms note03-07) and 2003 Test Beam results:
Cosmic rays are free, have no schedule , illuminate uniformly, are in all production sites.
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
The Installation Task
1
42
3567
89 10 11
12
The Barrel Muon system comprises 250 chambers in 7 flavors:
60 MB1 3SL 2 RPC ~2.0 x 2.54 m2 960kg60 MB2 3SL 2 RPC ~2.5 x 2.54 m2 1200kg60 MB3 3SL 1 RPC ~3.0 x 2.54 m2 1300kg
40 MB4 2SL 1 RPC ~4.2 x 2.54 m2 1800kg
10 MB1 2SL 1 RPC 10 MB2 2SL 1 RPC10 MB3 2SL 1 RPC
10 Sectors will be installed in SX5 => 210 Chambers(310 RPCs). Sectors 1 and 7 are used for the lowering fixture and will be installed in UX5 => 40 Chambers(60 RPCs).
SL
SL
SLHoneycombMB4 (Torino)
Have two Superlayers only
help1
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
the position of the s equipotential depends on the cell geometry (i.e. on the strip width and on the wire radius)
Vw-Vs determines the GAIN in the gas : the request of a gain of ~ 10^5 determines the position of the s equipotential to be ~ 2.5 mm from the wire
the presence of the grounded Al plates and beams between S and C makes the positionof the g equipotential quite independent of the Voltages of s and c
Vc ( and Vs) must generate in the region between c and g ( and between g and s )an E field between 1 and 2 KV/cm to saturate the drift velocity
42 mm
continuous lines represent electrodes dotted lines represent equipotential surfaces
SgC W
s a b
b/a ~ .65
13mm
LHCC Comprehensive Review 10/2/01 CMS MUONS: Drift Tubes and Alignment fabrizio
Help cell
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
LNL 5/9/2003 96 SL 32 CHAachen 15/8 102 SL 34 Madrid 10/9 120 SL 34 CH
100 ch out of 210
Chambers at ISR MB1 20 by dec.03 29 MB2 28 38 MB3 25 30
Total 73 97
These figures can imply that all the dressing will be done for all chambers at ISR (to be agreed)
Help schedule
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
*
*
*
*
*
*
*
*
aa
bShift registers
a +b = T
Help BTI
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
Help ISR
BX Efficiency -2
HH HL LL
Ho Hi Lo Li
drop of correlated efficiency at large angles due to geometrical cuts (single BTI 56o traco 42o)
DT Trigger Performance - Sara Vanini 15
Help TB2003 Traco CCB
Como 6-10 october, 2003
ICATPP 2003A.T. Meneguzzo Padova University & INFN PadovaA.T. Meneguzzo Padova University & INFN Padova
.31
BTI nBTI n+1
BTIs overlap
B (TESLA) longitudinal component
B (TESLA) radial component
H-trig = 4/4 layersL-trig = 3/4 layers
.05 .1 .16 .21 .26BW
.38 .56 .77 .96 1.15Bn .19
BTI test in Magnetic Field (test beam 2000, CMS note 2001/051)Prob. of one/4 layers affected by delta 16%, more than one 4%
CMS TN 051 2001
Help TB2000 BTI