Data Acquisition Issues at the International Linear Collider Front End Readout Issues ● Large...
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Transcript of Data Acquisition Issues at the International Linear Collider Front End Readout Issues ● Large...
Data Acquisition Issues at theData Acquisition Issues at the IInternational nternational LLinear inear CColliderollider
Front End Readout Issues
● Large channel counts require low power consumptionpower cycling ?
● 1 ms active pipeline for up to 5000 bxlocal buffering digital or analog
● hit finding, zero suppression on detector itselfACICs on the detector VFE
● high multiplexing to reduce signal cables (material)
Gas Amplification R&DGas Electron Multiplier (GEM) Micro Mesh (MICROMEGAS)
TPC R&D Efforts● ~200 3-dim tracking points● Low material budget● Particle ID via dE/dx● Track reconstruction at large radii● avoid Ion feedback without gating● occupancy may be an issue
(Aachen, LBNL, Carleton, Montreal, Victoria, DESY, Hamburg, Karlsruhe, Cracow, MIT, MPI Munich, NIKHEF, Novosibirsk, Orsay, Saclay, Rostock)
ECAL SiW sampling calorimeter Segmentation: 1cm x 1 cm, 40 layers, 24X
0
ΔE/E =0.11/√E(GeV) + 0.01 ~30Milllion channels
HCAL● Option I: Stainless steel and scintillator tiles with advanced photo detectors● Option II: Stainless steel and digital readout
(RPCs, wire chambers, GEMs)
Calorimeter R&D Examples
G. Eckerlin (DESY), P. le Du (DAPNIA CEA Saclay), U. Mallik (University of Iowa) and H. Matsunaga (University of Tsukuba) for the DAQ working group of the Worldwide Study of the Physics and Detectors for Future Linear e+e- Colliders
The world HEP community has reached consensus that an e+e- Linear Collider with an energy reach of 500GeV to 1TeV should be the next machine to be built and operated before the end of the LHC area. A global R&D and design effort has started aiming for a design report in 2006 of this machine called International Linear Collider. Three detector design studies have so far been launched to elaborate the possible phase space of the detectors to be built. The detector designs are driven by the operational parameters and the physics potentials of this high luminosity machine. The bunched operation of the ILC with a roughly 1ms long pulse train at a rate of 3-5 Hz leading to more than 100ms between trains and very little time between bunches in the train lead to the proposal of a completely trigger less data acquisition system. This 'software trigger' architecture and its consequences to the detector design, the front end electronics and the data acquisition system are presented. Some examples on detector R&D are shown.
Today’s ILC Data Collection Network
Run Control
MonitoringHistograms
Event Display
DCS
Databases
...
AnalysisFarm
Mass storage Data logging
ConfigManager
Local/worldwide
Remote(GDN)
Synchronisation
NO On line – Off line boundary
Local/Global Network(s)Wordlwide!
Machine BxBT feedback
Local partition
Data collectionSw triggers
Sub DetectorRead-Out
Node (COTS boards)
FPGA
receiver Buffer
FPGA
receiver Buffer
FPGA
receiver Buffer
Proc
receiver Buffer
Data link(s) Services
Networking Hub
On detector Front EndOn detector Front End
FPGA
Possible Common RO Architecture
Preamp.ShaperDigitizer
VTXCCDMAPSDEPFET…..
TRKSiTPC
ECALSiWOther
HCALDigitalAnalog
MuonRPCScint
VFD & Lumi…..
Detectors technology
FPGA
ReceiverSignal Processing
Buffer
localdata collection
node
Standard links & protocolUSB,Firewire …..
LaptopPC Board
Intelligent mezzaninePC…
NETWORK
Ethernet
Services SynchroCalibrationMonitoring
? Integration
to be studied!
on detectorvery FE
LOCAL
BUFFER
common/uniformInterface
DAQ Architecture (TDR 2003)
VTX SIT FDT ECALFCHTPC HCAL MUON LCALLAT
799 M 1.5 M40 M300 K 40 K75 K200 K32 M20 K 20 K
20 MB 1 MB 3 MB90 MB110 MB2 MB 1 MB1 MB 1 MB 1 MB
P PPPP PPPP PPPPP P P
Computing ressources (Storage & analysis farm)
Event buildingNetwork
10 Gbit/sec
Processor farm (one bunch train per processor)
Event manager & Control
Detector Buffering (per bunch train in Mbytes/sec)
Detector Channels
(LHC CMS 500 Gb/s)
30 Mbytes/sec 300TBytes/year
Links
Select Bunch Of Interest
Evolution of DAQ Parameters
SociologySociologyExp.Exp.
UA’sUA’s
LEPLEP
3 µsec3 µsec
10-20 µsec
10-20 µsec
--
250 - 500K250 - 500K
--
--
--
10 Mbit/sec
10 Mbit/sec
5-10 MIPS5-10 MIPS
100 MIPS100 MIPS
150-200150-200
300-500300-500
Collision rate
Channel count
L1Arate
Event building
Processing.Power
1980
1989
Year
LHCLHC
ILCILC
25 ns25 ns
330 ns330 ns
200 M*200 M*
900 M*900 M*
100 KHz100 KHz
3 KHz3 KHz
20-500 Gbit/s
20-500 Gbit/s
10 Gbit/s10 Gbit/s
>106 MIPS>106 MIPS
~105 MIPS~105 MIPS
2007
2015 ?
BaBarBaBar
Tevatron
4 ns4 ns
396 ns
150K150K
~ 800 K
2 KHz2 KHz
10 - 50 KHz
400 Mbit/s400 Mbit/s
4-10 Gbit/sec
1000 MIPS1000 MIPS
5.104 MIPS
400400
500500
1999
2002
20002000
> 2000 ?> 2000 ?
* including pixelsSub-Detector
Pixel
Microstrips
Fine grain trackers
Calorimeters
Muon
LHC
150 M
~ 10 M
~ 400 K
200 K
~1 M
ILC
800 M
~30 M
1,5 M
30 M
The vertex detector design :
● 5 layer pixel detector● Inner Radius: 15mm● Pixel: 20 x 20 μm2
● 800 mio channels● High occupancy for Layer 1 needs fast readout
Vertex Detector R&D Examples
Monolithic Active Pixel Sensors
Depleted Field Effect Transistor
CCD
(IReS, LEPSI, RAL, Liverpool, Glasgow, Geneva, NIKHEF)
(Bonn, MPI HLL Munich)
(LCFI Collaboration: Bristol, Glasgow, Lancaster, Liverpool, Oxford, RAL) p+
p+ n+
n
n+
tota lly dep letedn --substrate
internal gate
rear contact
source top gate drain bulk potentia l via ax istop-gate / rear contact
V
potentia l m in im umfor electrons
p-channel
p+
Some sensor R&D examples
Moderate physics rates
e+e- WW → 930 / houre+e- tt → 70 / houre+e- HX → 17 / hour
top pair productionseen by the LDC detector
cms energy 500 800 GeVrepetitionrate 5 4 Hzbunches/pulse 2820 4886pulse length 950 860 μsbunch spacing 337 176 nsluminosity 3.4x1034 5.8x1034 cm-2s-1
(Parameters are under reconsideration. Values from TESLA TDR are shown)
/ /199 ms
1ms
2820 bunches 5 Hz
ILC Operation
→ up to 20kHz bunch crossing rate
Detector Concept Studies
• TPC• High granularity calo• High precision microvertex • 4Tesla
LDCGLDSiD
• Si Strips • SiW EM• 5 Tesla
• Large gaseous Tracker (JET or TPC)
• W/Scint EM cal• 3 Tesla
Main Tracker EM Calorimeter Had Calorimeter Cryostat/Coil Iron Yoke
for further information see:
● Worldwide Study of the Physics and Detectorshttp://physics.uoregon.edu/~lc/wwstudy
● SiD http://www-sid.slac.stanford.edu http://sid.fnal.gov● LDC http://www.ilcldc.org● GLD http://ilcphys.kek.jpReadout ASIC on wafer 1-2k channels
A Combined ECAL/HCAL prototype is under construction and will be used in test beams.(CALICE Collaboration: 26 Institutes from 9 countries)
VME/…
HCAL
Movable table
ECALBeam
monitoring
BEAM
VME/…
HCAL
Movable table
ECALBeam
monitoring
BEAM
ASICmulti channel (18)preampshapingmultiplexinglow noiselow power (5mW/ch)
next steps :power cyclingADC integrateddyn. Range >104
Event size comparable to ATLAS/CMS
105
104
103
102
LHCb
KLOE
HERA-B
CDF/DO II
CDF
H1ZEUS
UA1
LEP
NA49ALICE
Event Size (bytes)
104 105 106
ATLASCMS
106
107
BtevKtev
ILC
Event Rate