zeus experiment 2001
DESCRIPTION
ZEUS experiment 2001. Installation of Microvertex Detector Hera upgrade for higher collision rates Data analyses. Proposal, design and construction took 4 years February 2001 final transport from NIKHEF to DESY Feb/March full system test March 27th installation in ZEUS - PowerPoint PPT PresentationTRANSCRIPT
ZEUS
Dec
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1 Nikhef Jamboree
ZEUS experiment 2001
• Installation of Microvertex Detector
• Hera upgrade for higher collision rates
• Data analyses
ZEUS
Dec
. 200
1 Nikhef Jamboree
• Proposal, design and construction took 4 years• February 2001 final transport from NIKHEF to
DESY– Feb/March full system test– March 27th installation in ZEUS– July short cosmic run– December first collision(s)
Silicon Microvertex Detector
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Dec
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electrons protons
60 cm
32 cm
Layout Microvertex Detector
Cross section wheel Cross section barrel
Support cylinderdivided in 2 halves
=
=
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Barrel Sensors
Detector side Hybrid side
2 half modules Ladder
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MVD assembly
300 barrel half modules 112 wheel modules 30 ladders 8 half wheels
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MVD assembly (2 halves)
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MVD assembly (two halves)
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Full System test
• 200 k readout channels have to function together• test final setup for the cabling• setting/monitoring low voltage front end readout• setting/monitoring bias voltage sensors• test complete readout chain analog datalink/ADC,
triggers for pedestals and testpulses• cooling • slow control monitoring• measure cosmics
• Full system operational, No bad surprises• about 1% of channels give problems
ZEUS
Dec
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• Cosmic Ray setup at DESY
Scintillatortowers
Scintillatorplates forforward wheels
Scintillatorat the side
x-y plane z-y plane
Full System Test
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Dec
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• First Results Reconstruction Cosmic Rays
– Event display single track event
E.Maddox
Full System test
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Dec
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• First Results Reconstruction Cosmic Rays• Distribution of residuals track fit obtained
with default geometry, more survey data to be included.
Residual (mm)Residual (mm)
R Phi hits Z hits
Full System Test
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Dec
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1 Nikhef Jamboree
• Response ‘inclined’ Tracks
clustersum
angle beta angle
angle alpha0 1.5 rad
1.5 rad0
clustersum
clustersum
Full System Test
ZEUS
Dec
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1 Nikhef Jamboree
Detailed Monte Carlo simulations exist for MVD
GEANT
Status of the new tracking software
MC tracks
Impact parameter resolution at vertex for fitted single tracks
E.Maddox
With MVD included!
Up to NOW,CTD only
xy
xy
z
z
0.4mm
0.07mm
2.2mm
0.08mm
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Dec
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1 Nikhef Jamboree
Manifold water cooling(two mounted on top of eachother, input/output)
Polyurethane tubes
Stainless steel tube
MVD assembly (cooling)
ZEUS
Dec
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1 Nikhef Jamboree
• Monitoring Cooling system as function of Time (hor.scale hist. 12 hours)
Switch on low voltage
Water temp. (14C) Water press (1.6bar) Humidity in MVD
Temp. wheel ~23C
Temp. ladder ~18C Temp. ladder ~18CTemp. ladder ~18C
Temp. in MVD ~18C Temp. in MVD ~18CMonitor 1 Monitor 2
Cooling Performance
ZEUS
Dec
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1 Nikhef Jamboree
Inserted in front (proton side) Cables at the rear
MVD in ZEUS
March 27th 2001 in ZEUS Hall
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Dec
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4 years of design and construction work beautifully documented onweb page and put on CD by Marco Kraan
1 year assemblyand installation workcompiled on a 25’video byEls Koffeman
Documentation
ZEUS
Dec
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1 Nikhef Jamboree
Install quadrupoles near interaction pointinstall spinrotators, long.polarized e-beams
Luminosityx 5
1000 pb-1
end 2005
HERA +ZEUS upgrade
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Dec
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1 Nikhef Jamboree
HELIX chips (AMS 0.8 CMOS) •tested up to 500Krad
• worse performances (S/N)• partly recoverable changing operation point
Radiation damage FE electronics
J.Velthuis
Single sensor
m
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Dec
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• irradiation from IP negligible•off momentum e- and e-
(<20 GeV)•Synchrotron radiation,
backscattered fromcollimators (<100 keV )complex pattern
•Proton beam loss (accidents)
Monitor radiation backgroundwith pin diodes near the beampipe inside the MVD.
34 mm
28 mm
diodes
Monitor Background Radiation
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Dec
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1 Nikhef Jamboree
Proton structure -evolution equations -parton densitiesGluon radiation - first and higher orderHadronization - many MonteCarlo generators
‘hard scale’ : high Q2, high ET jets, high mass…...
What do we observe?
-Diffractive events-Deep inelastic scattering-multi jet events-heavy quark production….
DGLAP,BFKL,CCFM,MRS,GRV,CTEQnn,..
HVQDIS,DISENT,JETNLO,DISASTER,..
HERWIG,RAPGAP,EPSOFT,PHOJET,LEPTO,ARIADNE,CASCADE,PYTHIA,DJANGO,HERACLES….
Physics at HERA test and understanding QCD
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Dec
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322
22
4
2
2
2
))1(1())1(1(2
xFyFyFyxQdxdQ
dL
x fractional four-momentum of struck quarky inelasticity
Q2 four-momentum transfer squared e
N. Tuning(PhD thesis Sept.2001)
e
Proton structure function
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Dec
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N. Tuning
Highest x-bins
Proton structure function F2
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Dec
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HERA II: -improve high x,Q2 data - e-running, balance samples - progress theory (NNLO), better fits
Proton structure function xF3
322
22
4
2
2
2
))1(1())1(1(2
xFyFyFyxQdxdQ
dL
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Dec
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Any sign of charm production
πDD* S.Schagen.. ec
K
eOpen Charm Production in DIS
c2F
)M(Kπ)M(K-) M(K s
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Dec
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DD *.. ec
Kinematical quantities
S.Schagen
Open Charm Production in DIS
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Dec
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Contribution of charm to proton structure function F2
S.Schagen
Open Charm Production in DIS
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Dec
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Available data very still very scarce
Reconstruct jets and look for electrons or muonsin jet as function of
HERA II: + MicroVertex gives proper b- data + MicroVertex gives more c-decay channels, smaller Background, smaller kin extrapolations--> better measurement
Beauty Production in Photoproduction
relt
p
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data? e versusein productionD differenceAny - *
More Open Charm Production in DIS
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More Open Charm Production in DISNo special triggers requiredAll DIS events accepted
0KM
M 2KM3KM 00
-M
-M KK
-M KK
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•Use the large number of D* collected in ZEUS (~31K)
•Select D+s1 D*+K0
S (K-++
S)(+-) + c.c.•From the well measured f(c D*+) we get the fragment. fraction f(c D+
s1)
.)%(14.0.)(.)(18.024.1)( 08.006.01 brsyststatDcf s
HERA: a Charm factory
Just an example
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Dec
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• D* production in diffractive DIS• Charm in Photoproduction vs NLO• Charm dijet photoproduction vs LO
and NLO• Huge D* sample in photoproduction
– charm fragmentation universal?– spectroscopy of D mesons– probe rare decays– ..
D*)f(c
Many new results
BUT HERA II + MicroVertex will do better + improved triggers
HERA: a Charm factory
ZEUS
Dec
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1 Nikhef Jamboree
ZEUS
Dec
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1 Nikhef Jamboree
ZEUS
Dec
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1 Nikhef Jamboree
ZEUS
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1 Nikhef Jamboree
ZEUS
Dec
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1 Nikhef Jamboree
ZEUS
Dec
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1 Nikhef Jamboree
322
22
4
2
2
2
))1(1())1(1(2
xFyFyFyxQdxdQ
dL
x fractional four-momentum of struck quark
Q2 four-momentum transfer squared
y inelasticity
W photon-proton centre of mass energy
22 kkQ
qp
Qx
2
2
kp
qpy
2kpW
Proton structure function
ZEUS
Dec
. 200
1 Nikhef Jamboree
MVD assembly (two halves)
• Install Beampipe on lower MVD half• Carbonfiber tube surrounds Beampipe
– protection silicon– electrical shielding beam
• Turn upper MVD half upside down • Mount both halves together with help precision pins on
support frames• Connect both halves electrically and create Faraday cage
for the front end readout• keep supportframes attached until installation in ZEUS
ZEUS
Dec
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1 Nikhef Jamboree
Rear end MVD
Super conducting magnetburied in MVD cables
HERA +ZEUS upgrade