1 Fermilab Trigger Workshop: 11- Oct-03 H. Evans The DØ Run IIb L1Cal (past, present & future) Hal Evans Columbia University Why Give This Talk? 1. Introduce/Attract New Participants 2. Review Where We Are 3. Remember Constraints: Cost & Schedule 4. Start Discussion on Where We’re Going
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1 Fermilab Trigger Workshop: 11-Oct-03H. Evans The DØ Run IIb L1Cal (past, present & future) Hal EvansColumbia University Why Give This Talk? 1.Introduce/Attract.
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1 Fermilab Trigger Workshop: 11-Oct-03H. Evans
The DØ Run IIb L1Cal(past, present & future)The DØ Run IIb L1Cal
(past, present & future)
Hal Evans Columbia University
Why Give This Talk?
1. Introduce/Attract New Participants
2. Review Where We Are
3. Remember Constraints: Cost & Schedule
4. Start Discussion on Where We’re Going
2 Fermilab Trigger Workshop: 11-Oct-03H. Evans
OutlineOutline
1. Overview & Review Physics Goals System Architecture The Current Team
2. Current Status Boards in the System Prototype Integration Test
3. Where Do We Stand Cost & Schedule Where We Need Help
4. Getting to the End What Should We Do (start of discussion)
5. Handy Glossary of Acronyms( )
3 Fermilab Trigger Workshop: 11-Oct-03H. Evans
L1Cal is Key (Higgs or No)L1Cal is Key (Higgs or No)
L1 Calorimeter Trigger is the primary mechanism for collecting: e/, Jets, Invisible Particles (MET)
Physics Sample Channels Cal Triggers
Electro-Weak EM, MET
Top EM, Jet
(calibrate E-scale)
B Physics Bs Mixing (hadronic) EM, Cal-Track
New Phenomena EM, Jet, MET
Higgs EM, Jet, MET
Z / W
bbZ
jets all jets,tt
WWH
bb H W/Z(*)
/
KK011
01
01
021
G ,bWt
~~
~~~~
4 Fermilab Trigger Workshop: 11-Oct-03H. Evans
What Can We ExpectWhat Can We Expect
0
50
100
150
200
250
300
3 4 5 6 7 8 9 10Start of Fiscal Year
Pea
k Lu
min
osity
(x1
030cm
-2se
c-1)
1.61032
2.81032
Accelerator Draft Plan:Peak Luminosities
5 Fermilab Trigger Workshop: 11-Oct-03H. Evans
But Rate is a ProblemBut Rate is a ProblemTrigger Run IIa Definition Example Channel L1 Rate [kHz]
(no upgrade)L1 Rate [kHz](w/ upgrade)
EM 1 EM TT > 10 GeV WevWHevjj
1.3 0.7
DiEM 1 EM TT > 7 GeV 2 EM TT > 5 GeV
ZeeZHeejj
0.5 0.1
Muon 1 Mu Pt > 11 GeVCFT Track
WvWHvjj
6 1.1
Di-Mu 2 Mu Pt > 3 GeVCFT Tracks
Z/ZHjj
0.4 <0.1
e + Jets 1 EM TT > 7 GeV2 Had TT > 5 GeV
WHevjjttev+jets
0.8 0.2
Mu + Jet 1 Mu Pt > 3 GeV1 Had TT > 5 GeV
WHvjjttv+jets
<0.1 <0.1
Jet+MEt 2 TT > 5 GeVMEt > 10 GeV
ZHvvbb 2.1 0.8
Mu+EM 1 Mu Pt > 3 GeV + Trk1 EM TT > 5 GeV
HWW,ZZ <0.1 <0.1
Iso Trk 1 Iso Trk Pt > 10 GeV H , Wv 17 1.0
Di-Trk 1 Iso Trk Pt > 10 GeV2 Trk Pt > 5 GeV1 Trk matched w/ EM
Solution to Signal Rise Time: Digital Filtering digitize Cal trigger signals 8-tap FIR (6-bit coeff’s) + Peak Detector run at BC2 reformats output for transmission to physics algo stage
Benefits allows running at 132 ns (keeps this option open) improvements in energy resolution (under study) note: this stage is necessary as input to algo stage
28 TapFIR
3 PointPeak
Detector2
ET
Look UpTable
ADC
10 bit30.28 MHz
Serializer
10 bit15.14 MHz
11 bit15.14 MHz
11 bit7.57 MHz
8 bit7.57 MHz
BC rate:7.57 MHz
Analoginput
ADF Processing Chain
8 Fermilab Trigger Workshop: 11-Oct-03H. Evans
Run IIb Solutions (2)Run IIb Solutions (2)
Solution for Rates: Sliding Windows Algorithm
Et cluster local max. search on 4032 () TT grid
Jet, EM & Tau algo’s Better calc of missing Et Topological Triggers Jet, EM clust output for
matching with L1 Tracks Benefits
2.5–3 Jet Rate reduction at const. eff.
ZHvvbb Rate: 2.10.8 kHz
Similar gains for EM &Tau MEt, Topological Triggers
under study
X RoI ET Cluster
Region
Data Needed for Declustering
Cand. RoI center
O O O O O
O O O O O
O O O O
O O O O O
O O O O O
RoI center used for compares
Jet Algo
X
RoI / EM cluster
EM Isolation
Had Isolation
EM Algo
X
RoI / Tau cluster
EM + Had Isolation
Tau Algo
9 Fermilab Trigger Workshop: 11-Oct-03H. Evans
Algorithm ResultsAlgorithm ResultsZ
H
b
b
x3
Turn-on Curves
from data
TTsAve = 0.4RMS/Ave = 0.5 Sliding Windows
Ave = 0.8RMS/Ave = 0.2
Et(trig) / Et(reco)w/ Run IIa Data!
Algorithm Study Status
Algo Rate Red. @ const eff
Comments
Jet 2.5 – 3 most studied
EM ? gains possible ???
Tau O(2) very preliminary
ICR ? tools available
10 Fermilab Trigger Workshop: 11-Oct-03H. Evans
The Run IIb L1Cal SystemThe Run IIb L1Cal System
Custom Board No Purpose
ADF: ACD/Dig. Filt. 80 digitize, filter, E-to-Et
ADF Timing F’out 4 ADF control/timing
TAB: Trig Algo Board 8 algo’s, Cal-Trk out, sums
GAB: Global Algo Board 1 sums, trigs to FWK
VME/SCL Board 1 VME comm & timing f’out to TAB/GAB