Accelerator based experimental particle physics
description
Transcript of Accelerator based experimental particle physics
Experimental Challenges of Big Collider Experiments
DELPHI@LEP 1989 - 2000 CERN
D0@Tevatron 2001 - ~2008 Fermilab
ATLAS@LHC ~2007 -> CERN
Presented by Kerstin Jon-And 2003-03-06
Accelerator based experimental particle
physics
R&D startdata taking
c.m. energy
bunch crossing rate
no of phys’s
SU hardwarecontribution
DELPHI~82 89-00
90 - 200 GeV
45 kHz ~500 calorimeterelectronis
D0(-99) 01~08
2 TeV 2.5 MHz(7.5 MHz)
~650 silicondetector
ATLAS
~92 ~07->
14 TeV 40 MHz ~1800
calorimeter and triggerelectronics
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p p
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pp€
e+e−
Collider experiments with
SU participation
The ATLAS instrumentation projects are a close collaboration between the Particle Physics and the Instrumentation Physics groups.
Physics requirements (examples)
H photons em calorimeter mH ~ 1.3 GeV (~ 1%)
H 4 muons muon tracking mH ~ 3.6 GeV
in mag. field (~ 2%)
SUSY jets hadronmissing ET calorimeter
(~ 4%@400GeV)
top e, , jets
B physics vertex inner detector R ~ 12 m (pixel)
~ 1ps tracking
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˜ q →q ˜ χ
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E
≤50%
E⊕ 3%
Photons
Electrons
Charged hadrons
Neutral hadrons
Muons
Neutrinos and
neutralinos
Inner
detector
Electromagnetic
calorimeter
Hadron
calorimeter
Muon
system
LEP/LHC
SPS
CERN
Fermilab
ATLAS
22 m
44 m
Vikt 7000 t
Subdetector technologies
innerdetector
emcalori-meter
hadroniccalori-meter
muondetector
D0
Si microstrips, scint. fiber tracker, solenoid (2 T)
U-LAr U-LAr mini-drift chambers, iron toroids
ATLAS
semicond. pixels,Si microstrips,straw tubes,solenoid (2 T)
lead-LAr,W-LAr
iron-scint. tiles,copper-LAr,W-LAr
drift tubes, cathode strip chambers,air core toroids (2-6 Tm)
Higgsinto twophotons
nopile-up
Higgsinto twophotons
L=10^34pile-up
SMT
D0 Barrels F-Disks H-DisksLayers/planes 4 12 4
Channels 387120 258000 147456Modules 432 144 192ReadoutLength
12 cm 7.5 cm 14.6 cm
Inner Radius 2.7 cm 2.6 cm 9.5 cmOuter Radius 9.4 cm 10.5 cm 26 cm
~ 793,000 readout channels
~6000 chips
SMT ladder
Sara at work at Fermilab testing Si detectors.
extended barrel
extended barrel, 32 modules à 3 m
barrel, 64 modules à 6 m and 10 tons
ATLAS Tile calorimeter
Tilecal principle
scintillator
WLS fiber
iron
PMT
particles
Tilecal electronics requirements
• To digitize PMT signals obtained from different calorimeter segments.
• To provide a dynamic range of 16 bits for the energy measurements. Two versions of each signal, a high and a low gain, are presented to the digitizer, which contains the logic to choose gain.
• To digitize data every 25 ns and store data in a pipeline for at least 2.5 s awaiting the Lvl1 decision.
• To be sufficiently radiation tolerant.
• Adopt the design to the space available inside the “drawers”.
Digitizer boards
256 “super drawers” with 6 or 8 boards ~ 2000 boards
local engin.
technical genius (prof)
administrative boss(prof)
technical experts (PhD stud)
QC
boss bossLHCK
GRID
Tilecal m’g’ment @ CERN
industry 10
industry 1industry 2
industry 8industry 9
Tilecal @ CERN
physics data!!
ATLAS in the pit 2007
U. of Clermont-F
Tilecal electronics SU
2000 digitizers
Jonas and Magnus at work at Tilecal digitizer test bench
Pre-assembly of Tilecal: 20.01.2003 - 14 Modules
CylinderPreass.start-end
Assem.in the pit,start-end
EBCOct 02 -Mar 03
Oct 04 - Feb 05
BarrelMay 03 - Nov 03
May 04 - Oct 04
EBAFeb 04 - June 04
May 05 - Sept 05
Upgrading the LHC … the SLHC• Initial Studies
• Physics
• Detector R&D
From presentation by R. Cashmore ATLAS week Feb. 2003
FUTURE developments?D0 upgrade for run IIb in 2006 - ongoing at Fermilab
Detector development for a linear e+e-
collider?
References+ Talks by F. Gianotti, D. Green and F. Ruggiero at the ICFA Seminar (Oct 2002)
ConclusionsLHC luminosity upgrade can extend:• physics reach of LHC at a moderate extra cost relative to initial LHC investment. • the LHC ‘lifetime’
To realise this reach, the LHC detectors must preserve performance: trackers must be rebuilt, and calorimeters, muon systems, triggers and DAQ need development. Upgrades programme, from launch to data taking will take 8-10 years The time to start is soon.
If the path of going to higher luminosities is chosen then need to support a detector and accelerator R&D programme similar to the DRDC* one but perhaps more directed.
* Current LHC detector technologies were chosen after a very successful Detector R&D programme launched by CERN in early 90’s
From presentation by R. Cashmore ATLAS week Feb. 2003