zeus experiment 2001
Download
Skip this Video
Download Presentation
ZEUS experiment 2001

Loading in 2 Seconds...

play fullscreen
1 / 40

ZEUS experiment 2001 - PowerPoint PPT Presentation


  • 59 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' ZEUS experiment 2001' - mare


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
zeus experiment 2001
ZEUS experiment 2001
  • Installation of Microvertex Detector
  • Hera upgrade for higher collision rates
  • Data analyses

Nikhef Jamboree

silicon microvertex detector
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

Nikhef Jamboree

layout microvertex detector
Layout Microvertex Detector

32 cm

electrons

protons

60 cm

Support cylinder

divided in 2 halves

=

=

Nikhef Jamboree

Cross section wheel

Cross section barrel

barrel sensors
Barrel Sensors

2 half modules

Ladder

Detector side

Hybrid side

Nikhef Jamboree

mvd assembly
MVD assembly

300 barrel half modules 112 wheel modules

30 ladders 8 half wheels

Nikhef Jamboree

full system test
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

Nikhef Jamboree

full system test1
Cosmic Ray setup at DESYFull System Test

Scintillator

at the side

Scintillator

towers

Scintillator

plates for

forward

wheels

x-y plane

z-y plane

Nikhef Jamboree

full system test2
First Results Reconstruction Cosmic Rays

Event display single track event

Full System test

E.Maddox

Nikhef Jamboree

full system test3
First Results Reconstruction Cosmic Rays

Distribution of residuals track fit obtained with default geometry, more survey data to be included.

Full System Test

R Phi hits

Z hits

Nikhef Jamboree

Residual (mm)

Residual (mm)

full system test4
Response ‘inclined’ TracksFull System Test

clustersum

clustersum

angle beta

0

1.5 rad

clustersum

0

angle alpha

1.5 rad

Nikhef Jamboree

status of the new tracking software
Status of the new tracking software

Detailed Monte Carlo simulations exist for MVD

Impact parameter resolution at vertex for fitted single tracks

Up to NOW,CTD only

GEANT

With MVD included!

MC tracks

Nikhef Jamboree

E.Maddox

mvd assembly cooling
MVD assembly (cooling)

Stainless steel tube

Polyurethane tubes

Manifold water cooling

(two mounted on top of each

other, input/output)

Nikhef Jamboree

cooling performance
Monitoring Cooling system as function of Time (hor.scale hist. 12 hours)Cooling Performance

Switch on low voltage

Water temp. (14C)

Water press (1.6bar)

Humidity in MVD

Temp. ladder ~18C

Temp. ladder ~18C

Temp. ladder ~18C

Temp. in MVD ~18C

Temp. in MVD ~18C

Temp. wheel ~23C

Monitor 1

Monitor 2

Nikhef Jamboree

mvd in zeus
MVD in ZEUS

Cables at the rear

Inserted in front (proton side)

March 27th 2001 in ZEUS Hall

Nikhef Jamboree

documentation
Documentation

4 years of design and construction

work beautifully documented on

web page and put on CD by

Marco Kraan

1 year assembly

and installation work

compiled on a 25’

video by

Els Koffeman

Nikhef Jamboree

hera zeus upgrade
HERA +ZEUS upgrade

Install quadrupoles near interaction point

install spinrotators, long.polarized e-beams

Luminosity

x 5

1000 pb-1

end 2005

Nikhef Jamboree

radiation damage fe electronics
Radiation damage FE electronics
  • m
  • HELIX chips (AMS 0.8 CMOS)
  • tested up to 500Krad
    • worse performances (S/N)
    • partly recoverable changing operation point

J.Velthuis

Single sensor

Nikhef Jamboree

monitor background radiation
Monitor Background Radiation

34 mm

  • irradiation from IP negligible
  • off momentum e- g and e- (<20 GeV)
  • Synchrotron radiation, backscattered fromcollimators (<100 keV g)complex pattern
  • Proton beam loss (accidents)

28 mm

diodes

Monitor radiation background

with pin diodes near the beampipe inside the MVD.

Nikhef Jamboree

physics at hera test and understanding qcd
Physics at HERA test and understanding QCD

Proton structure

-evolution equations

-parton densities

Gluon radiation

- first and higher order

Hadronization

- many MonteCarlo generators

‘hard scale’ : high Q2, high ET jets,

high mass…...

What do we observe?

DGLAP,BFKL,CCFM,MRS,GRV,CTEQnn,..

HVQDIS,DISENT,JETNLO,DISASTER,..

HERWIG,RAPGAP,EPSOFT,PHOJET,LEPTO,

ARIADNE,CASCADE,PYTHIA,

DJANGO,HERACLES….

-Diffractive events

-Deep inelastic scattering

-multi jet events

-heavy quark production

….

Nikhef Jamboree

proton structure function
Proton structure function

e

Q2 four-momentum transfer squared e

x fractional four-momentum of struck quark

y inelasticity

N. Tuning

(PhD thesis Sept.2001)

Nikhef Jamboree

proton structure function f2
Proton structure function F2

N. Tuning

Highest x-bins

Nikhef Jamboree

proton structure function xf3
Proton structure function xF3

HERA II: -improve high x,Q2 data

- e-running, balance samples

- progress theory (NNLO), better fits

Nikhef Jamboree

open charm production in dis
Open Charm Production in DIS

e

Any sign of charm production

S.Schagen

Nikhef Jamboree

open charm production in dis1
Open Charm Production in DIS

Kinematical quantities

S.Schagen

Nikhef Jamboree

open charm production in dis2
Open Charm Production in DIS

Contribution of charm to proton structure function F2

S.Schagen

Nikhef Jamboree

beauty production in photoproduction
Beauty Production in Photoproduction

Available data very still very scarce

Reconstruct jets and look for electrons or muons

in jet as function of

HERA II: + MicroVertex gives proper b- data

+ MicroVertex gives more c-decay channels, smaller

Nikhef Jamboree

Background, smaller kin extrapolations--> better measurement

more open charm production in dis1
More Open Charm Production in DIS

No special triggers required

All DIS events accepted

Nikhef Jamboree

hera a charm factory
HERA: a Charm factory

Just an example

  • Use the large number of D* collected in ZEUS (~31K)
  • Select D+s1 D*+K0S (K-++S)(+-) + c.c.
  • From the well measured f(c  D*+) we get the fragment. fraction f(c  D+s1)

Nikhef Jamboree

hera a charm factory1
HERA: a Charm factory

Many new results

  • 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
    • ..

BUT

HERA II + MicroVertex will do better

+ improved triggers

Nikhef Jamboree

slide38

Proton structure function

Q2 four-momentum

transfer squared

x fractional four-momentum

of struck quark

y inelasticity

W photon-proton centre of

mass energy

Nikhef Jamboree

mvd assembly two halves1
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

Nikhef Jamboree

slide40

HERA +ZEUS upgrade

Rear end MVD

Super conducting magnet

buried in MVD cables

Nikhef Jamboree

ad