1 ALICE T0 detector W.H.Trzaska (on behalf of T0 Group) LHCC Comprehensive Review, March 2003.
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Transcript of 1 ALICE T0 detector W.H.Trzaska (on behalf of T0 Group) LHCC Comprehensive Review, March 2003.
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1
ALICE T0 detectorALICE T0 detector
W.H.Trzaska
(on behalf of T0 Group)
LHCC Comprehensive Review, March 2003
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W.H.T. LHCC Comprehensive Review, March
2003 2
Evolution of Evolution of T0T0 detector concept detector concept
Initial proposal (TP, MoU) one detector does it all (MCP) cost ~1.5 MCHF (Greece,
Russia)
Fall 2000 split of FMD into 3
sub.detectors: Si FMDSi FMD, V0V0 and T0T0 (cost ~200 kCHF)
Spring 2001 Choice of PMT-based T0
(worked-out by a Russian team)
Spring 2002 Finland commits 200 kCHF to T0
and joins the T0 collaboration
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W.H.T. LHCC Comprehensive Review, March
2003 3
T0 must work for all ions and for all energy T0 must work for all ions and for all energy densitiesdensities
central
minimum bias
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W.H.T. LHCC Comprehensive Review, March
2003 4
Main requirements:Precise timing (50 ps) also on-lineMain LVL0 triggerRough on-line vertex (1.5 cm)Beam – gas suppressionPre-trigger for TDREvent spacing 25 ns (pp)Provide backup for V0 and FMDOperates in the magnetic field (0.5 T)Huge dynamic range (almost 1:1000)
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W.H.T. LHCC Comprehensive Review, March
2003 5
T0 – the final configuration:T0 – the final configuration:Two arrays of 12 PMTs with quartz radiators
T0 Right ( + 0.7 m) T0 Left ( - 3.5 m)
Two shoe boxes of fast electronics inside the magnet (+5 m and –5 m)Few creates of electronics outside the magnetLaser calibration system also outside the magnet
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W.H.T. LHCC Comprehensive Review, March
2003 6
Output signals:
T0 = (tr+tl)/2+td
T0v = tr-tl (ON/OFF adjustable during run)T0-L, T0-R, CoincTime and energies (all 24 PMTs)3 levels of sum energy Low Medium High
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W.H.T. LHCC Comprehensive Review, March
2003 7
T0 LeftT0 Left & & T0 RightT0 Right arrays: arrays: T0 LeftT0 Left & & T0 RightT0 Right arrays: arrays:
T0L -5 < < -4.5
T0R 2.9 < < 3.3
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W.H.T. LHCC Comprehensive Review, March
2003 8
Mechanics – T0 Right
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W.H.T. LHCC Comprehensive Review, March
2003 9
T0 Left
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W.H.T. LHCC Comprehensive Review, March
2003 10
T0-Right 1:1 prototype:T0-Right 1:1 prototype: T0-Right 1:1 prototype:T0-Right 1:1 prototype:
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W.H.T. LHCC Comprehensive Review, March
2003 11
Front view:Front view:
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W.H.T. LHCC Comprehensive Review, March
2003 12
Back view:Back view:
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W.H.T. LHCC Comprehensive Review, March
2003 13
End-cups on the base side:
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W.H.T. LHCC Comprehensive Review, March
2003 14
Mounting of the optical fibre (0.4 mm)
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W.H.T. LHCC Comprehensive Review, March
2003 15
PiLaserPiLaser400 nmpulse width <40ps roughly 400mW optical peak out of the fibre
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W.H.T. LHCC Comprehensive Review, March
2003 16
Possible location of shoe boxes:
Box50 W
Box50 W
12 PMTfull current
<15 W
12 PMTfull current
<15 W
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W.H.T. LHCC Comprehensive Review, March
2003 17
Inside the shoe box:
Inside the shoe box:
Am
p1gain=1
Am
p2gain=22
Am
p3ga
in=1
Mul
tiple
xer
D1
D2
Comparetor
output
output
Am
pg
ain
=2
2
Delay R1
R2
Delay
Adder
Dis
cri
min
ato
r 0
Shaper
Comparator
Input
Output
Dual CFDUnit
Dual CFDUnit
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W.H.T. LHCC Comprehensive Review, March
2003 18
Characteristics of the Dual CFD Unit
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W.H.T. LHCC Comprehensive Review, March
2003 19
Pre-TDR timetable
Production completed by July 2005Fully assembled T0 Tests before shipment to CERN Oct.
2005 Shipment to CERN – November 2005 Final tests – December 2005 Installation in ALICE – March 2006
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W.H.T. LHCC Comprehensive Review, March
2003 20
Pre-TDR financing
200 kCHF from Finland Sufficient to cover the detector and
front-end electronics
Readout electronics and integration with DAQ Collaboration with TOF group Greek contribution
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W.H.T. LHCC Comprehensive Review, March
2003 21
Highlights of 2002:Highlights of 2002:
Completion of the first draft of TDR (100 pages!)Mechanical prototype of T0 RightFinal multiplicity resolution simulationsElectronic prototypes: Dual CFD Unit (2 prototypes) Mean timer Circuit for generating T0V signal
Choice of laser and the layout of the laser calibration system
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W.H.T. LHCC Comprehensive Review, March
2003 22
Still to be chosen:
Final choice of time discriminators(test run @ CERN in July 2003)
Final configuration of readout electronics, DAQ and trigger collaboration with TOF discussions with the Greek team
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W.H.T. LHCC Comprehensive Review, March
2003 23
Measured performance of CFDU (JYFL) prototypeMeasured performance of CFDU (JYFL) prototype
5.3 ps/ch
Time walk
-40-20
0204060
1 10 100 1000 10000
Input amplitude [mV]
ps
Time walk
-40-20
0204060
1 10 100 1000 10000
Input amplitude [mV]
ps
Jitter = 25 ps (fwhm)
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W.H.T. LHCC Comprehensive Review, March
2003 24
The third option:
CFD DELAY
ADC RAM
RAMlogA
DELAY
T0
TlogA
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W.H.T. LHCC Comprehensive Review, March
2003 25
Mean timer prototype
C
1 2 p F
In1
I o
1 5 m A
+V
ECL/NIMDriver
Fastcomparator
I o
1 5 m A
NIM/PECLDriver
In2FastSwitch
FastSwitch
Out
NIM/PECLDriver
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W.H.T. LHCC Comprehensive Review, March
2003 26
T0VDC
Fast digitiser for T0V signal
Range of coded time intervals ±2.5 nsDigitisation step 20 ps (for 8-bit)Dead time not more than 25 nsTAC + Flash ADC
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W.H.T. LHCC Comprehensive Review, March
2003 27
T0VDC performance
0
50
100
150
200
250
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00
Delay [ns] vs. channel number
Calibration spectrum
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W.H.T. LHCC Comprehensive Review, March
2003 28
Cables and connection from L3
HV cables 2 x 12
Coaxial cables Thresholds 2 x 12 Bunch crossing 2 x 1 Time individual 2 x 12 Output Amplitudes 2 x 12 TRD wake up 2 x 4 T0 right/left 2 x 1
Optical fibre 2 x 12
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W.H.T. LHCC Comprehensive Review, March
2003 29
Counting room
Outside the Magnet (~5 m)
Inside the Magnet12 quartz counters
(T0 right)
Two ( left and right ) Constant Fraction Discriminator Units
1 ..................... 12
12 quartz counters(T0 left )
1 ..................... 12
BC
T0rightT0left
T0TRMs(T0 TDC Readout
Module)
Controlbus
T0signalDe-multiplexingcard LTM
(Local TriggerModule)
T0vertexT0signalT0multiplT0busy
1 ....................... 24
DDL
BC
Experimental area(~30 m)F
ast
char
ge
to t
ime
con
vert
or
(FQ
T)
RORC(Read-Out Receiver
Card)
LDC(Local Data
Concentrator)
T0left to TRD
T0right to TRD
De-
mu
ltip
lexi
ng
card
T0TRMs(T0 TDC
Readout Module )
DRM(Data Readout
Module)
BC
General, preliminary readoutscheme for T0:
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W.H.T. LHCC Comprehensive Review, March
2003 30
Layout and connections:
....
T0
TR
D
12 quartz counters(T0 right)
Two ( left and right ) Constant Fraction Discriminator Units
12 quartz counters(T0 left )
T0
AR
M
De
-mu
ltip
lex
ing
ca
rd
LTM
Am
plif
ire
s
DR
M
T0
AR
M
Ca
ma
c D
riv
er
VME Redaout Crate VME Local tTirgger Crate
LTU
TT
Cv
i
TT
Ce
x
Sin
gle
Bo
ard
Pro
cc
es
so
r
Camac Control Crate
Ge
ne
rato
r/L
as
er
cin
tro
ller
VD
L &
Ga
tec
on
tro
ller
Ca
ma
c c
rate
co
ntr
olle
r
T0
TR
M...
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W.H.T. LHCC Comprehensive Review, March
2003 31
Large change compared to the previous version of PYTHIA:
Efficiency of registration of p-p collisions
0 20 40 60 80 100 120 140 16050
55
60
65
70
75
80
85
90
95
100
Eff
icie
ncy
Multiplicity threshold
L R D