IEEE RT 2003, Montreal, 18-23 May 2003 1 S. Dhawan ZEUS MVD and GTT Group: ANL, Bonn Univ., DESY-Hamburg -Zeuthen, Hamburg Univ., KEK-Japan, NIKHEF, Oxford Univ., Bologna, Firenze, Padova, Torino Univ. and INFN, UCL, Yale, York. The Architecture of the ZEUS The Architecture of the ZEUS Second Level Global Track Second Level Global Track Trigger GTT Trigger GTT Satish Dhawan Yale
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The Architecture of the ZEUS Second Level Global Track Trigger GTT
The Architecture of the ZEUS Second Level Global Track Trigger GTT. Satish Dhawan Yale. Outline. Interaction. MVD. CTD. The ZEUS Experiment and Trigger Why a GTT ? Interfacing to ZEUS detector components The Global Track Trigger Performance and first experience with real data - PowerPoint PPT Presentation
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IEEE RT 2003, Montreal, 18-23 May 2003 1 S. Dhawan
ZEUS MVD and GTT Group: ANL, Bonn Univ., DESY-Hamburg -Zeuthen, Hamburg Univ., KEK-Japan, NIKHEF, Oxford Univ., Bologna, Firenze, Padova, Torino Univ. and INFN, UCL, Yale, York.
The Architecture of the ZEUS The Architecture of the ZEUS Second Level Global Track Trigger Second Level Global Track Trigger
GTTGTT
Satish Dhawan Yale
IEEE RT 2003, Montreal, 18-23 May 2003 S. Dhawan2
OutlineOutline
The ZEUS Experiment and TriggerThe ZEUS Experiment and Trigger Why a GTT ?Why a GTT ? Interfacing to ZEUS detector componentsInterfacing to ZEUS detector components The Global Track TriggerThe Global Track Trigger Performance and first experience with real dataPerformance and first experience with real data Summary and OutlookSummary and Outlook
MVDMVD
CTDCTD
STTSTT
InteractionInteraction
TriggerTrigger
epep
IEEE RT 2003, Montreal, 18-23 May 2003 S. Dhawan3
The ZEUS DetectorThe ZEUS Detector HERA
– e± proton collider
ZEUS
– Multi-purpose ep experiment with tracking and calorimetry
IEEE RT 2003, Montreal, 18-23 May 2003 S. Dhawan15
First GTT latency resultsFirst GTT latency results
2002 running HERA after lumi upgrade compromized by high background rates
– Mean datasizes from CTD and MVD were larger than the design
Sept 2002 runs used to tune datasize cuts
– Allowed GTT to run with acceptable mean latency and tails at the GSLT
– Design rate of 500 Hz appears possible
CTD VME readout latency with respect to MVD
MVD VME SLT readout latencyms msms ms
ms
GTT latency after complete trigger processing
Mean GTT latency vs GFLT rate per run
MVD-GTT Latency as measured by GSLT
Low data occupancy rate tests
HERA
Montecarlo
Hz
IEEE RT 2003, Montreal, 18-23 May 2003 S. Dhawan16
Resolution including MVD from MC ~400 μm
First tracking resultsFirst tracking results
Dijet Montecarlo Vertex Distribution
mm
Run 42314 Event 938
Run 44569 Vertex Distribution
Collimator C5backscattering
Nominal Vertex
GTT eventdisplay
Physics datavertex distribution
ep candidate
IEEE RT 2003, Montreal, 18-23 May 2003 S. Dhawan17
Resolution including MVD from MC ~400 μm
First tracking resultsFirst tracking results
Dijet Montecarlo Vertex Distribution
mm
Yet another backgroundevent
Run 44569 Vertex Distribution
Collimator C5backscattering
Nominal Vertex
GTT eventdisplay
Physics datavertex distribution
IEEE RT 2003, Montreal, 18-23 May 2003 S. Dhawan18
Summary and OutlookSummary and Outlook
The MVD and GTT system have been successfully integrated into the ZEUS experiment 267 runs with 3.1Mio events recorded between 31/10/02 and 18/02/03 with MVD on
and DQM (~ 700 nb-1) The MVD DAQ and GTT performance (latency, stability and efficiency) are satisfactory
Next steps: Utilize results of the barrel algorithm at the GSLT Finalize development and integration of the forward algorithm
So far very encouraging results. Looking forward to routine high
luminosity data taking. The shutdown ends in June 2003...
Why does the GTT work…
Use 2002 CPU+Network technology → performance increase