the cleo-c trigger system: more than just blinking lights ! lepp lunch talk mats selen
DESCRIPTION
The CLEO-c Trigger System: More Than Just Blinking Lights ! LEPP Lunch Talk Mats Selen. Overview Tracking Calorimeter Timing Performance. You are the trigger: You stamp “y” on the pink hexagonal widgets You stamp “n” on the others. Your friend DAQ saves only widgets labeled “y”. Trigger. - PowerPoint PPT PresentationTRANSCRIPT
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M. Selen, 7/24/03 LEPP Lunch: Pg 1www.hep.uiuc.edu/cleo/trig3/
The CLEO-c TriggerThe CLEO-c Trigger System:System:More Than Just Blinking Lights !More Than Just Blinking Lights !
LEPP Lunch Talk
Mats Selen
Overview Tracking Calorimeter Timing Performance
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M. Selen, 7/24/03 LEPP Lunch: Pg 2www.hep.uiuc.edu/cleo/trig3/
What the Trigger & DAQ DoesWhat the Trigger & DAQ Does
Suppose you want to keep only pink hexagonal widgets moving down a conveyor belt.
y/n
y yn n
Trigger
You are the trigger: You stamp “y” on the pink hexagonal widgets You stamp “n” on the others
n
y
trash
SAVE
DAQ
Your friend DAQsaves only widgetslabeled “y”
The problem is: Working fast means you make some mistakes !
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M. Selen, 7/24/03 LEPP Lunch: Pg 3www.hep.uiuc.edu/cleo/trig3/
Requirements: Decision TimeRequirements: Decision Time
Each widget must get examined and stamped
y/n
y yn n
Trigger
- You need to decide on one before the next one comes along.
- Your decision can’t take longer than t = d/v.
- Taking more time means making less mistakes.
v
d
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M. Selen, 7/24/03 LEPP Lunch: Pg 4www.hep.uiuc.edu/cleo/trig3/
Requirements: EfficiencyRequirements: Efficiency
You can’t stamp too many pink hexagonal widgets ”n”:
y/n
n nn n
Trigger
SAVE
DAQ
nn n
trash
?? ?
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M. Selen, 7/24/03 LEPP Lunch: Pg 5www.hep.uiuc.edu/cleo/trig3/
Requirements: RejectionRequirements: Rejection
y/n
y yy y
Trigger
The rate of widgets stamped “y” can’t exceed the capacity of your friend (the DAQ) to save them.
y
trash
SAVE
DAQ
y
Whenever the DAQ is busy saving something it causes “dead-time” (he will miss the next few widgets). If he misses any marked “y”, thiscauses a loss of efficiency.
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M. Selen, 7/24/03 LEPP Lunch: Pg 6www.hep.uiuc.edu/cleo/trig3/
y/n
Working in Steps: PipeliningWorking in Steps: Pipelining
Have more than one person working in series
- Each individually one takes less than t = d/v- Collectively, much more work is done- A smarter decision can be made – less mistakes
y yn n
Trigger
n
y
trash
SAVE
DAQ
v
d
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M. Selen, 7/24/03 LEPP Lunch: Pg 7www.hep.uiuc.edu/cleo/trig3/
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M. Selen, 7/24/03 LEPP Lunch: Pg 8www.hep.uiuc.edu/cleo/trig3/
14 feet
800 feet
d = 14 feet, v = 1 foot/ns
t = 14 ns
There are 183 RF buckets in CESR
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M. Selen, 7/24/03 LEPP Lunch: Pg 9www.hep.uiuc.edu/cleo/trig3/
The trigger runs at1/3 the CESR RF freq
(i.e. each step is 42 ns)
This smears together 3 beam collisions every time we look. We can do this
since its very rare that anything happens during a collision.
In CESR/CLEO, beam collisions are
spaced a minimum of 14 ns apart.
This is not enough time to do any serious trigger processing
Only ~45 of thesebuckets contain beam ‘bunches’
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0 1 2 3 . . . . . . 58 59 60
0
1
2
3
60
59
58
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M. Selen, 7/24/03 LEPP Lunch: Pg 11www.hep.uiuc.edu/cleo/trig3/
0 1 2 3 . . . . . . 58 59 60
0
1
2
3
60
59
58
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0 1 2 3 . . . . . . 58 59 60
More about thisin a few minutes
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M. Selen, 7/24/03 LEPP Lunch: Pg 13www.hep.uiuc.edu/cleo/trig3/
Trigger Philosophy Use only drift chamber (DR) and calorimeter (CC) information. Make trigger decision every 42ns (i.e. trigger clock rate). Take enough time (number of pipelined steps) to make a sophisticated Level-1
trigger decision: About 2 s. The readout deadtime is about 20 s, so we need to keep the trigger rate < 1000
Hz.
RF bucket
Pipeline clk
Early DR
Late DR
Early CC
Late CC
look here for CC info
72 MHz
24 MHz
look here for DR infoSuppose eventhappens here
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M. Selen, 7/24/03 LEPP Lunch: Pg 14www.hep.uiuc.edu/cleo/trig3/
TRCR
Mixer/ShaperBoards
TILE(8)
ASUM
QVME
TILE (16)
ASUM
AXTR(16) AXX(16)
DR3 - TQT
STTR(12)
TRCR
L1D
G / CAL
DFC
CLEO
An
alo
g
Gates
ctrl
.
Mixer/Shaper Crates (24)
QVME
TPRO(2)
TCTL
TIM
DM/CTL
TIM
DM/CTL
TIM
DM/CTL
TPRO(4) TIM
DM/CTL
TIM
DM/CTL
AXPR
CCGL
SURF
SURF
Drift Chamber Crates
Axi
al t
rack
erS
tere
o t
rack
er
Bar
rel C
CE
nd
cap
CC
CC
Dig
ital
Lev
el 1
dec
isio
nF
low
co
ntr
ol &
Gat
ing
DAQ
CLEO-III/cTriggerSystem
Overview
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What it Looks LikeWhat it Looks Like (all more or less alike to untrained (all more or less alike to untrained
eye)eye)
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Common FeatureCommon Feature
FPGA based Logic
DAQ/VME
CircularBuffer
Inputs Outputs
TDITMSTCK
TDO JTAG
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16 AXTRtrigger boards
backplane(single ended)
16 AXX receiver boards
LVDS fromDR3 preampstrack info to
TRCR
106 x 2Repeatingunit (x 8)
7
Axial Tracking TriggerAxial Tracking Trigger
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Layer 9 = “key”
InnerLookup
OuterLookup
Inner/Outer track correlator
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Stereo Stereo Tracking Tracking TriggerTrigger
There are too many wires to form allcombinations in LUT
- Combine these into 4x4 blocks
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r
TQT
48
TQT
48
8
8
8
stereo trigger hardware
8
1 superlayer
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= Hit wire location at z = 0
Track trajectory:Pperp = 350 MeV/c = 35o
= 15o
-shifted curve, Pperp = 350 MeV/c = 35o
= 17o
Track in U and V IndependentlyTrack in U and V Independently
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Axial – Axial – Stereo Stereo
CorrelationCorrelation
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Axial – Axial – Stereo Stereo
CorrelationCorrelation
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Axial112
112
48
Raw key wires
Clustered key wires
Axial matching cells
48 high
48 low
Stereo - U
48 high
48 low
Stereo - V
Axial - Stereo CorrelationAxial - Stereo Correlation
high highlow
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Calorimeter TriggerCalorimeter Trigger
Energy sharing between boardscan result in a loss of efficiency:
Present summing = Tile summing =
Sim
ula
ted
E
ffic
ien
cy
containedshower
Threshold = 500 MeV
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Wrinkle – We need to work fast!Wrinkle – We need to work fast!
Preamp out
Mixer/shaper out
Trigger signal
Discriminator out
2 s/div
Calorimeter trigger informationcomes ~ 1.8 us after crossing.
twicedifferentiated
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1 m/s crate
1 m/s card
lowmed
high
“Tiling” sets too many bits Must Sparsify
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H M L proj
01
11
11
10
11
H
M
L
proj 11
11
10
01
H
M
L
011
001
001
lowmed
highAvailable
to decisionboards
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10
Key
Wir
e
Time Bucket
20
30
40
50
60
70
80
90
100
110
5 10 15 20
#trackEv-time
Timing IssuesLOW
MED
HIGH
CC time – TR time
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0 1 2 3 . . . . . . 58 59 60
That’s how thisplot is made !
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Compare to Simulation
(1995)
Mean = 17.5RMS = 0.73
Mean = 16.9RMS = 0.51
Mean = 16.7RMS = 0.41
Mean = 16.6RMS = 0.37
1 track events 4 track events
7 track events 10 track events
Trigger Time (42ns bucket) Trigger Time (42ns bucket)
Trigger Time (42ns bucket) Trigger Time (42ns bucket)
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Pipe-delay
Fro
m A
XT
R
MAKE 48MATCHINGCELLS
Bac
k-pl
ane
Pipe-delay
FINDEVENTTIME
Pipe-delay
AXIALCELLCOUNT
CB & DAQ
Typical Trigger Board
For timealignment
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AXPR
TRCR-1
TRCR-2
CCGL
L1D
From AXTRCrate
From STTRCrate
From TPROCrate
To DAQ
L1D Trigger Crate
LUMI
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LUT
8 FPGAs
Timing (3)
Info (185)
Timing (TR, CB or CE)
Info (valid at timing edge)
Route48 Prescale24 Bunch24
Scaler
L1-accept
Bac
kpla
ne
Trigger Decision Boards (L1D)Trigger Decision Boards (L1D)
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How To Define How To Define a CLEO-c a CLEO-c
Trigger LineTrigger Line
% Generic Hadron Line, Barrel Timing%SUBDESIGN line0(
in[117..0] : INPUT;out : OUTPUT;
)
Variable1cblow : SOFT;3tracks : SOFT;evtime : SOFT;
Begin-- trigger bit mappings:
tr_time[1..0] = in[1..0];cb_time[1..0] = in[3..2];ce_time[1..0] = in[5..4];cc_time[1..0] = in[7..6];
tr_n_hi[3..0] = in[11..8];tr_n_lo[3..0] = in[15..12];tr_n_ax[3..0] = in[19..16];tr_lowpos[1..0] = in[21..20];
cb_l_phi[7..0] = in[29..22];cb_h_phi[7..0] = in[37..30];
cb_low_old[1..0] = in[39..38];cb_med_old[1..0] = in[41..40];cb_high_old[1..0] = in[43..42];ce_low_old[1..0] = in[45..44];ce_med_old[1..0] = in[47..46];ce_high_old[1..0] = in[49..48];
cb_n_low[2..0] = in[52..50];cb_n_med[2..0] = in[55..53];cb_n_high[2..0] = in[58..56];ce_n_low[2..0] = in[61..59];ce_n_med[2..0] = in[64..62];ce_n_high[2..0] = in[67..65];
bha_theta[7..0] = in[75..68];
cc_spare[15..0] = in[91..76];
cpu_trig[1..0] = in[93..92];
control[23..0] = in[117..94];
------------------------------------------------ trigger line definition
1cblow = cb_n_low[] > 0;
3tracks = (tr_n_hi[]>2) # ((tr_n_hi[]>1)&(tr_n_lo[]>0)) #((tr_n_hi[]>0)&(tr_n_lo[]>1)) ;
evtime = cb_time[0];
out = 1cblow & 3tracks & evtime;
End;
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1/PT 1/PT
1/PT 1/PT
“Non-IsolatedTracks”
InHadronEvents
All TracksNo Trigger
- hardware
No Trigger
-missing hits
PT
Total Efficiency
200 MeV
Axial Trigger
Performance
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1/PT
“IsolatedElectronTracks”
All Tracks
No Trigger
Total Efficiency
210 MeV
Stereo Trigger
Performance(with axial)
B = 1.5 T
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1/PT
“IsolatedElectronTracks”
All Tracks
No Trigger
Total Efficiency
140 MeV
Stereo Trigger
Performance(with axial)
B = 1.0 T
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CC Trigger Performance
.8
.6
.4
.2
1.0
Needsmorestudy
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For Lots More InfoFor Lots More Info
http://www.hep.uiuc.edu/cleo/trig3/