Download - Detector for GlueX
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Detector for GlueX
JLab PAC 23
Jan 20, 2003
Physics Beamline Hall D
GlueX Detector
Software Trigger
ComputingEnvironment
PRL
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What is needed?
9-GeV polarized photon beam Coherent bremsstrahlung beam
Hermetic detector for multi-particle charged and neutral final statesCharged Solenoid-based detector
Select events of interest with high sensitivity High DAQ rate capability with software trigger
Analysis environment for successful PWA
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Construction Site
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Status of Civil Design
Credible optics design Layout that provides room for detectors and
access to equipment Beam containment proposal Concept for civil design GEANT Calculations show that the shielding
satisfies radiation protection guidelines
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Hall D site layout
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Coherent bremsstrahlung beam
Photon beam energy (GeV)
Flu
x
Delivers the necessary polarization, energy and flux concentrated in the region of interest
P = 40%
Photon beam energy (GeV)
Lin
ear
Pola
riza
tion
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Gluonic excitations transfer angular momentum in their decays tothe internal angular momentum of quark pairs not to the relative angularmomentum of daughter meson pairs - this needs testing.
GlueX will be sensitive to a wide variety of decay modes - the measurements of which will be compared against theory predictions.
To certify PWA - consistency checks will be made among different final states for the same decay mode, for example:
b1 0 3
0 2
Should givesame results
X b1For example, for hybrids: favored
not-favoredX Measure many decay modes!
Hybrid decays
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GlueX detector
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Solenoid ships from Los Alamos
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Unloading at IUCF
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Exploded view of the GlueX detector
TARGET VTXCDC
FDC
CERENKOV Pb-GLASS DET
12
.00
The components are extracted by “4 ft” from each other for maintenance.
TOF
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Particle kinematics
All particlesMost forward particle
p → X p → K+K─+─ p
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GlueX Detector
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Central trackingStraw tube chamber
Vertex Counter
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Forward drift chambers
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Charged particle resolution
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Calorimetry
Built by IU for BNL Exp 852
Pb GlassBarrel
Mass
0
Pb/SciFi detector based on KLOE/E = 4.4 %/ √E, threshold = 20 MeVt = 250 ps
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Particle identificationTime-of-flight, Cerenkov counter, and constraints for exclusive events
p → K*K*p, E = 9 GeV
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Hall D Prototype (IHEP Run 2001)
Time Resolution (2cm by 6 cm Bar) vs. Position
0
10
20
30
40
50
60
70
80
90
-100 -80 -60 -40 -20 0 20 40 60 80 100
Position (cm)
Tim
e R
esol
utio
n (p
s)
Predicted resolution for one bar, beam thru 2 cm.Predicted resolution for one bar, beam thru 6 cm.Predicted resolution for two bars, beam thru 6 cm.Measured resl'n, 6 cm, two bars, no weighting.Measured resl'n, 6 cm, two bars with weighting.
Poor PM was on this end.
42 ps avg. resolution
R. Heinz / IU
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PID with Cerenkov and forward TOFTOF =100 ps resolution
n= 1.0014 n= 1.0024
p → K+K+p, E = 9 GeV
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Acceptance is high and uniform
-1 -0.8 -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 0.8 10
0.2
0.4
0.6
0.8
1
Cos(GJ)
5 GeV
Mass(X) = 1.4 GeV
Mass(X) = 1.7 GeV
Mass(X) = 2.0 GeV
-3 -2 -1 0 1 2 30
0.2
0.4
0.6
0.8
1
GJ
-1 -0.8 -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 0.8 10
0.2
0.4
0.6
0.8
1
Cos(GJ)
8 GeV
Mass(X) = 1.4 GeV
Mass(X) = 1.7 GeV
Mass(X) = 2.0 GeV
-3 -2 -1 0 1 2 30
0.2
0.4
0.6
0.8
1
GJ
-1 -0.8 -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 0.8 10
0.2
0.4
0.6
0.8
1
Cos(GJ)
12 GeV
Mass(X) = 1.4 GeV
Mass(X) = 1.7 GeV
Mass(X) = 2.0 GeV
-3 -2 -1 0 1 2 30
0.2
0.4
0.6
0.8
1
GJ
p -> n
-1 -0.8 -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 0.8 10
0.2
0.4
0.6
0.8
1
Cos(GJ)
5 GeV
Mass(X) = 1.4 GeV
Mass(X) = 1.7 GeV
Mass(X) = 2.0 GeV
-3 -2 -1 0 1 2 30
0.2
0.4
0.6
0.8
1
GJ
-1 -0.8 -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 0.8 10
0.2
0.4
0.6
0.8
1
Cos(GJ)
8 GeV
Mass(X) = 1.4 GeV
Mass(X) = 1.7 GeV
Mass(X) = 2.0 GeV
-3 -2 -1 0 1 2 30
0.2
0.4
0.6
0.8
1
GJ
-1 -0.8 -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 0.8 10
0.2
0.4
0.6
0.8
1
Cos(GJ)
12 GeV
Mass(X) = 1.4 GeV
Mass(X) = 1.7 GeV
Mass(X) = 2.0 GeV
-3 -2 -1 0 1 2 30
0.2
0.4
0.6
0.8
1
GJ
p -> p p Xn n
p Xn 00n
Acceptance in
Decay Angles
Gottfried-Jackson frame:
In the rest frame of Xthe decay angles aretheta, phi
assuming 9 GeVphoton beam
Mass [X] = 1.4 GeV
Mass [X] = 1.7 GeV
Mass [X] = 2.0 GeV
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Trigger and DAQ
Level 1
Level 3
PhysicsSignal
Software-basedLevel 3 System
Start @ 107 /sOpen and unbiased triggerDesign for 108 /s 15 KHz events to tape
Level 1 trigger systemWith pipeline electronics
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Trigger and DAQ
Level 1
Level 3
PhysicsSignal
Software-basedLevel 3 System
Start @ 107 /sOpen and unbiased triggerDesign for 108 /s 15 KHz events to tape
Level 1 trigger systemWith pipeline electronics
Hadronic rate in detector
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Trigger Rates
Output of Level 3software trigger
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Luminosity limits
GlueX raw rates will bewell below currentlyrunning CLAS electronbeam experiments
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DAQ architecture 90 VME front-end crates
Gigabit switch 200 KHz
200 Level 3 Filter Nodes
8 event builders
4 event recorders
4 tape silos
8 100-Mbit switches
Network connection to silo 15 KHz
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Fully pipeline system of electronics
Flash ADCs: 13000 channelsTDCs : 8000 channels
DeadtimelessExpandableNo delay cables
(Non-pipeline: Limits photon flux < 107/s, incurs deadtime, requires delay cables)
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Data Volume per experiment per year (Raw data - in units of 109 bytes)
100
1000
10000
100000
1000000
1980 1990 2000 2010
E691
E665
E769
E791
CDF/ D0
KTeV
E871
BABAR
CMS/ ATLAS
E831
ALEPH
J LAB
STAR/ PHENIX
NA48
ZEUS
But: collaboration sizes! Ian Bird
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Data Handling and ReductionCLAS GlueX
Event size 5 KB 5 KB
Data volume 100 TB/year 1000 TB/year
cpu speed 0.4 GHz 6.4 GHz
cpu time per event 100 ms 15 ms
cpu count 150 225
Reduction speed 7 MB/s 75 MB/s
Throughput limit cpu speed cpu speed
Reduction time 0.5 year 0.4 year
Data rate up by 10, computer costs down by > 5
GlueX Computing Effort ~ 2 x CLAS
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Computing Model
DAQ Level 3 Farm
EventReconstruction
Calibration
Physics Analysis
Physics Data
Tier “2” Centers
Tier “1” Center (Jlab)
Tier “2” Simulation Center
1 PB/year 0.2 PB/yr
0.2 PB
100 MB/s
70 MB/s
20 MB/s
Physics Analysis
20 MB/s
Monte Carlo
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Detector designed for PWADouble blind studies of 3 final states
p
n
X
Linear Polarization
m [GeV/c2]
GJ
a2
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LeakageAn imperfect understanding of thedetector can lead to “leakage” of strength from a strong partial waveinto a weak one.
STRONG: a1(1260) (JPC=1++)
Break the GlueX Detector (in MC).
Look for Signal strength in Exotic 1-+
Under extreme distortions, ~1% leakage!
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Ongoing R&D effort
Solenoid – shipped to IUCF for refurbishment Tracking – testing straw chamber; fabricating endplate prototype
(CMU) Vertex - study of fiber characteristics (ODU/FIU) Barrel calorimeter – beam tests at TRIUMPF; fabricated first test
element of the Pb/SciFi matrix (Regina) Cerenkov counter – magnetic shield studies (RPI) Time-of-flight wall – results of beam tests at IHEP show ps (IU) Computing – developing architecture design for Hall D computing Electronics – prototypes of pipeline TDC and FLASH ADC (Jlab/IU) Trigger – Studies of algorithm optimization for Level 1(CNU) Photon tagger – benchmarks of crystal radiators using X-rays
(Glasgow/UConn) Civil – beam height optimized; electron beam optics shortens length of
construction; new radiation calculations completed (Jlab)
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7
R.T. Jones, Newport News, Mar 21, 2002
Benchmarks of Diamond Crystals
Stone 1407 Slice 1 (4mm x 4 mm X-ray rocking curve)
Richard Jones / Uconn
Stone 1482A Slice 2 (10mmx10mm X-ray rocking curve)
High Quality Poor Quality
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Straw Tube chamber workGraduate Students: Zeb Krahn and Mike Smith
Built a -gun using a 10 Ci 106Ru Source
Getting coincidences with both cosmics and ’s
gun
cosmics
ArCO2 90-10ArEthane 50-50
Carnegie Mellon University
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Building a Prototype Endplate
Build endplates as 8 sections with tounge and groove.
Checking achievable accuracy
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Barrel calorimeter prototyping
Hybrid pmts can operate in fields up to 2 Tesla
University of Regina
Pb/SciFi prototype
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FLASH ADC Prototype
Paul Smith / IU
250 MHz, 8-bit FADC
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Pipeline TDC
= 59 ps
TDC counts
First prototype results: high resolution mode
Jlab DAQ and Fast Electronics Groups
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Cassel review of Hall D concluded“The experimental program proposed in the Hall D Project is well-suited for definitive searches for exotic states that are required according to our current understanding of QCD”
“An R&D program is required to ensure that
the magnet is usable,
to optimize many of the detector choices,
to ensure that the novel designs are feasible,
and to validate cost estimates.”
Working with input from many groups on electronics, DAQ, computing, civil, RadCon, engineering, and detector systems.