LCWS 2004, Paris, April '04 1G. Eckerlin
Overview of the Data Acquisition ActivitiesOverview of the Data Acquisition Activities
G. EckerlinDESY
LCWS 2004, Paris, April 20th 2004
Outline
Introduction
Some selected examples
Open questions
Outlook
LCWS 2004, Paris, April '04 1G. Eckerlin
World Wide ActivitiesWorld Wide Activities
A (personal) review of the DAQ sessions
from recent workshops...
4th ECFA/DESY workshop Amsterdam/Netherlands Apr. 2003
Cornell Linear Collider Workshop Ithaka/USA Jul. 2003
1st ECFA Study workshop Montpellier/France Nov. 2003
and selected topics of the detector and machine sessions from
Asian Linear Collider Workshop Mumbai/India Dec. 2003
ALCPG 2004 Winter Workshop SLAC/USA Jan. 2004
LCWS 2004, Paris, April '04 1G. Eckerlin
A short reminder...A short reminder...
The conditions
The software trigger concept
The basic structure
LCWS 2004, Paris, April '04 1G. Eckerlin
The Conditions at the LCThe Conditions at the LC
Physics Rate :
e+ e- X 0.0002/BX
e+ e- e+ e- X 0.7/BX
e+ e- pair background :
VXD inner layer 1000 hits/BX
TPC 15tracks/BX
-> Background is dominating the rates !
The LC is a pulsed machine
repetitian rate 5 (120) Hz
bunches per train 2820 (192)
bunch separation 337 (1.4) ns
train lenth 950 (0.26) s
train separation 199 (8.3) ms
-> long time between trains (short between pulses)
LCWS 2004, Paris, April '04 1G. Eckerlin
Data Acquisition ConceptData Acquisition Concept
up to 1 ms active pipeline (full train),no trigger interrupt,sparcification/cluster finding at FE
software event selection usingfull information of a complete train'bunch of interesst'
readout between trains (8-200ms)
LCWS 2004, Paris, April '04 1G. Eckerlin
Some selected topicsSome selected topics
Silicon Detector R&D (see talk from Joel Goldstein)
Gas Tracking R&D (see talk from Paul Colas)
Calorimeter R&D (see talk from Paul Dauncey)
Background
Accelerator DAQ
LCWS 2004, Paris, April '04 1G. Eckerlin
Silicon Strip Front End ReadoutSilicon Strip Front End Readout
Aurore Savoy-Navarro
Amsterdam 2003
512 channels/ladder
2560 channels/drawer
A/D=0.35µtechno, 8 bits
1MHz clock, 1.2mW
Main concern: low noise and sparing power dissipation at each corner of on-detector electronics
LCWS 2004, Paris, April '04 1G. Eckerlin
TPC Test DAQ systemsTPC Test DAQ systems
(some foil courtesy Nabil Ghodbane)
Ron Settles
Conrnell 2003
LCWS 2004, Paris, April '04 1G. Eckerlin
TPC DAQ Future ?TPC DAQ Future ?
Ron Settles
Conrnell 2003
LCWS 2004, Paris, April '04 1G. Eckerlin
Calice Test DAQ systemCalice Test DAQ system
APD fibre masks orflat-band connector to Si-PM cassette RO printed circuit
~ 3m analogue RO
CALICE UK group, P. Dauncey Volker Korbel
Montpellier 2003
LCWS 2004, Paris, April '04 1G. Eckerlin
Detector OccupanciesDetector Occupanciesfrom e+e- Pairs @ 500 GeVfrom e+e- Pairs @ 500 GeV
fcn(bunch structure, integration time)fcn(bunch structure, integration time)
Needs Study171 GeV1928 ms597, 0.9 GeVEndcap ECAL
Needs Study139 GeV1928 ms547, 0.73 GeVBarrel ECAL
101>3MeV0.63 GeV1150 ns1176, 0.63GeVBarrel ECAL
91>3MeV1.29 GeV1150 ns1176, 1.29GeVEndcap ECAL
Needs Study“Few per mil”1928 ms1377, ?trksTPC
2.4cm, 3T0.6/ mm21928 ms3.1E-3/mm2VXD-L2
1.2cm, 3T7.2/ mm21928 ms38E-3/mm2VXD-L1
2.6cm, 4T2.3/ mm2742250 μs3.1E-3/mm2VXD-L2
1.5cm, 4T5.3/ mm214850 μs36E-3/mm2VXD-L1
Few per mil16055 μs1336, 5trksTPC
CommentOccupancyEff#
B
R. O. Per bunchDetector
T
E
S
L
A
N
L
C
Tom Markiewicz
Conrnell 2003
LCWS 2004, Paris, April '04 1G. Eckerlin
Accelerator Data AcquisitionAccelerator Data Acquisition
NLC Data CollectionNLC Data Collection
• There are ~11K accelerator sections and 1K BPM’s.• Data per bunch (Not train, debatable if needed)• BPM X,Y,I – 2 bytes each + 10 bytes stuff = 16 bytes• Acc Section - 2 positions + FE + RE + phase @ 2 bytes + 20
bytes stuff = 30 bytes• 200 bunches/train * 120 trains/sec = ~20000 bunch/sec• Data Rate = 20000*(11K*30+1K*16)=7 Gbytes/sec• Should not be worse than 10 for the whole machine!!• Begins to look like a distributed detector data acquisition
problem. Some data compression will be needed.• Rapid access and analysis of this data may be a fun problem.
Marty Breitenbach
Conrnell 2003
LCWS 2004, Paris, April '04 1G. Eckerlin
Many more on DAQ Many more on DAQ
Many more presented in detector and machine sessions
This were just a few examples and should underline :
Data acquisition issue are addressed in many R&D groups
Data acquisition starts at the frond end
Be encouraged to show your R&D work in the DAQ sessions !
LCWS 2004, Paris, April '04 1G. Eckerlin
We would like to hear more about… We would like to hear more about…
Backgounds and occupancy
Online calibration
Alignement and track linking
Bunch tagging
Front End Control signals
Power/Cooling
Machine/Detector DAQ interplay
LCWS 2004, Paris, April '04 1G. Eckerlin
OutlookOutlook
Discussion on who to organize in future• Session : Wed. 21st 11:00 – 12:30
Contribute to the next Workshops !
• ALCPG LCWS (Victoria/July 04)• ECFA LCWS (Durham/Sep 04)• ACFA LCWS
