1. Overview of the Data Acquisition Activities
G. Eckerlin
DESY
LCWS 2004, Paris, April 20th 2004
Outline
Introduction
Some selected examples
Open questions
Outlook

2. World Wide Activities A (personal) review of the DAQ sessions
from recent workshops...
4th ECFA/DESY workshop Amsterdam/Netherlands Apr
Cornell Linear Collider Workshop Ithaka/USA Jul
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
ALCPG 2004 Winter Workshop SLAC/USA Jan

3. A short reminder... The conditions The software trigger concept
The basic structure

4. The Conditions at the LC
Physics Rate :
e+ e-  X /BX
e+ e-  e+ e- X  /BX
e+ e- pair background :
VXD inner layer hits/BX
TPC tracks/BX
-> Background is dominating the rates !
The LC is a pulsed machine
repetitian rate (120) Hz
bunches per train (192)
bunch separation (1.4) ns
train lenth (0.26) s
train separation (8.3) ms
-> long time between trains (short between pulses)

5. Data Acquisition Concept
up to 1 ms active pipeline (full train),
no trigger interrupt,
sparcification/cluster finding at FE
readout between trains (8-200ms)
software event selection using
full information of a complete train
'bunch of interesst'

6. Some 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

7. Silicon Strip Front End Readout
512 channels/ladder
Aurore Savoy-Navarro
Amsterdam 2003
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

8. TPC Test DAQ systems (some foil courtesy Nabil Ghodbane) Ron Settles
Conrnell 2003

9. TPC DAQ Future ?
Ron Settles
Conrnell 2003

10. Calice Test DAQ system APD fibre masks or
CALICE UK group, P. Dauncey
Volker Korbel
Montpellier 2003
~ 3m analogue RO
APD fibre masks or
flat-band connector to Si-PM cassette RO printed circuit

11. Detector Occupancies from e+e- Pairs @ 500 GeV fcn(bunch structure, integration time)
Tom Markiewicz
Conrnell 2003
Needs Study
171 GeV
192
8 ms
597, 0.9 GeV
Endcap ECAL
139 GeV
547, 0.73 GeV
Barrel ECAL
101>3MeV
0.63 GeV 1
150 ns
1176, 0.63GeV
91>3MeV
1.29 GeV
1176, 1.29GeV
“Few per mil”
1377, ?trks
TPC
2.4cm, 3T
0.6/ mm2
3.1E-3/mm2
VXD-L2
1.2cm, 3T
7.2/ mm2
38E-3/mm2
VXD-L1
2.6cm, 4T
2.3/ mm2
742
250 μs
1.5cm, 4T
5.3/ mm2
148
50 μs
36E-3/mm2
Few per mil
160
55 μs
1336, 5trks
Comment
Occupancy
Eff# B
R. O.
Per bunch
Detector
T E S L A
N L C

12. Accelerator Data Acquisition
NLC Data Collection
Marty Breitenbach
Conrnell 2003
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 + 2 bytes 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.

13. 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 !

14. 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

15. Outlook 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