experimental challenges and techniques for future accelerators joachim mnich desy xi icfa school on...
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![Page 1: Experimental Challenges and Techniques for Future Accelerators Joachim Mnich DESY XI ICFA School on Instrumentation in Elementary Particle Physics San](https://reader035.vdocuments.net/reader035/viewer/2022062314/56649e375503460f94b2804c/html5/thumbnails/1.jpg)
Experimental Challenges and
Techniques for Future Accelerators
Joachim Mnich
DESY
XI ICFA School on Instrumentation
in Elementary Particle Physics
San Carlos de Bariloche, Argentina
11 - 22 January 2010
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Joachim Mnich | Detectors at Future Colliders | ICFA Seminar Bariloche January 2010 | Page 2
Outline
> Lecture 1
Future particle physics at the energy frontier: case for a Linear Collider
Linear Collider Concepts
Experimental Challenges
Detector Concepts
> Lecture 2
R&D for detector components
Vertex detector
Tracking detectors
Calorimeters
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Joachim Mnich | Detectors at Future Colliders | ICFA Seminar Bariloche January 2010 | Page 3
> Particle Physics entering Terascale Start of the Large Hadron Collider (LHC) at CERN
> Expect answers to fundamental questions Origin of mass (Higgs)
Mystery of Dark Matter
Supersymmetry
Extra space dimensions
Grand Unification
Elementary Particle Physics: Challenges and Visions
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Joachim Mnich | Detectors at Future Colliders | ICFA Seminar Bariloche January 2010 | Page 4
Future of Particle Physics at the Energy Frontier
> LHC and its upgrades
Luminosity
Energy (?)
> Electron-Positron Linear Collider
ILC (supra-conducting technology)
CLIC (two-beam acceleration)
Muon collider (?)
> Here: emphasis on detector challenges for Linear Collider
LHC
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Joachim Mnich | Detectors at Future Colliders | ICFA Seminar Bariloche January 2010 | Page 5
Comparison Proton and Electron Colliders
Precision is main motivation for a new electron positron collider Complementarity to proton machines, e.g. SppS/Tevatron and LEP
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Joachim Mnich | Detectors at Future Colliders | ICFA Seminar Bariloche January 2010 | Page 6
Comparison Proton and Electron Colliders
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Joachim Mnich | Detectors at Future Colliders | ICFA Seminar Bariloche January 2010 | Page 7
Electron Positron Collider
strive for few 1034/cm2/s(comparable to LHC)
Recall: 1034/cm2/s corresponds to 100 fb-1 per year
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Joachim Mnich | Detectors at Future Colliders | ICFA Seminar Bariloche January 2010 | Page 8
Linear Collider Concepts
Summary: ILC ready to go ahead, but limited in energy reach ( ≤ 1 TeV) CLIC in very early state, but may pave the way for higher energy
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Joachim Mnich | Detectors at Future Colliders | ICFA Seminar Bariloche January 2010 | Page 9
Higgs
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Higgs
Introduction
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Joachim Mnich | Detectors at Future Colliders | ICFA Seminar Bariloche January 2010 | Page 11
Higgs Couplings
Introduction
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Verification of the Higgs Potential
Introduction
Text… 0λ0μλμ)(V 2422
4322 λH4
1HλHλ)H(V vv
vmH 2λ H
H
H
H H
HH
gHHHgHHHH
Measurement of double Higgs-strahlung: e+ e– HHZ
gHHH/ gHHH = 0.22
Measurement of gHHHH not possible
λμ- valuenexpectatio Vacuum 2v
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Giga-Z
Production of 109 Z-Bosonen at √s = 91 GeV
100-fold LEP I statistics polarisation (as SLC) 30 fb-1 = 1/2 year
Comparison today‘s SM-Fits with Giga-Z:
Comparison to direct Higgs mass measurement
LEP/SLC/Tevatron Giga-Z mZ 91 187,5 2,1 MeV --- sin2W 0,23153 0,00016 0,000013 Ab 0,899 0,013 0,001 Rb 0,21629 0,00066 0,00014 mW 80 392 29 MeV 6 MeV
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OutlineSupersymmetry If mSUSY < 2 TeV Discovery at the LHC
Template mass spectra:
Advantages of an electron positron collider: tune cms energy: turn on SUSY particles one-by one mass measurement at the kinematic threshold polarisation of electrons and positrons separation of SUSY partners, e.g.:
Scalar partners of fermions
Fermionic partners of bosons
2 Higgs-doublets
g~,χ~,,χ~,χ~ 04
01
HA,H,h,
SUSY will be the New Standard Model
21 t~,t~,,μ~,μ~,e~,e~ LRLR
RRRRLLLL e~e~ee e~e~ee
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Joachim Mnich | Detectors at Future Colliders | ICFA Seminar Bariloche January 2010 | Page 15
Introduction
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Electron-positron collider centre-of-mass energy up to 1 TeV centre-of-mass energy luminosities > 1034/cm2/s
Designed in a global effort Accelerator technology: supra-conducting RF cavities
Elements of a linear collider:
main linacbunchcompressor
dampingring
source
pre-accelerator
collimation
final focus
IP
extraction& dump
KeV
few GeV
few GeVfew GeV
250-500 GeV
The International Linear Collider
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International Linear Collider (ILC)
Positron polarisation
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ILC Time Schedule
2006: Baseline Configuration Document 2007: Reference Design Report
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Challenges
Quest for the highest possible accelerator gradient ILC goal: 35 MV/m
Huge progress over the last 15 years 25-fold improvement in perfomance/cost
Major impact on next generation light sources:
XFEL designed for ≥ 25 MV/m 10% prototype for ILC
Recall: LEP II used 7 MV/m
Development of Gradients in superconducting RF cavities
0
5
10
15
20
25
30
35
40
45
1980 1985 1990 1995 2000 2005
Year
Gra
die
nt
(MV
/m)
World Average
CEBAF
TESLA
TESLA
TESLA el.polish
Single cell
Development (schematic) of gradient in SCRF cavities
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RF gun
FEL experimental
area
bypass
4 MeV 150 MeV 450 MeV 1000 MeV
undulatorscollimator
bunch compressorLaser
bunch compressor
accelerator modules
FLASH: Prototype for XFEL and ILC
1 GeV electron LINAC based on SCRF used for ILC studies and as light source (free electron laser)
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Challenges Getting to 35 MV/m:
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Cavity Quality (Q value)
Superconducting cavity: Q>1010
A church bell (300 Hz) withQ=5 x 1010 would ring – once excited – longer than one year!
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Challenges Luminostity:
pointn interactioat dimensions beamσ
2)(factor t enhancemen disruption
frequency repetition pulse
bunchper )(positrons electrons ofnumber
pulseper bunches ofnumber
)(
rep
e
b
yx
DH
f
N
n
Dyx
HfNn
L σσ4rep
2eb
make beams as small as possible at IP 6 nm × 600 nm
and make them collide!!!
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Beam Beam Interactions
Simulation of two LC bunches as they meet each other
Andrei Sergey, SLAC
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Challenges
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Comparison LHC and ILC
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ILC Physics Motivation ILC will complement LHC discoveries by precision measurements
Here just two examples:
1) There is a Higgs, observed at the LHC e+e− experiments can detect Higgs bosons without assumption on decay properties Higgs-Strahlungs process (à la LEP)
identify Higgs events in e+e− → ZH from Z → µµ decay
count Higgs decay products to measure Higgs BRs and hence (Yukawa)-couplings
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ILC Physics Motivation Measure Higgs self-couplings e+e– ZHH to establish Higgs potential Note: small signal above large QCD background
2) There is NO Higgs (definite answer from LHC!) something else must prevent e.g. WW scattering from violating unitarity at O(1 TeV) strong electroweak symmetry breaking? → study e+ e– → WWνν, Wzeν and ZZee events
need to select and distinguish W and Z bosons in their hadronic decays! BR (W/Z → hadrons) = 68% / 70%
Many other physics cases: SM, SUSY, new phenomena, … Need ultimate detector performance to meet the ILC physics case
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Impact on Detector Design Vertex detector: e.g. distinguish c- from b-quarks
goal impact parameter resolution σrφ ≈ σz ≈ 5 10/(p sin Θ3/2) µm 3 times better than SLD small, low mass pixel detectors, various technologies under study O(20×20 µm2)
Tracking: superb momentum resolution to select clean Higgs samples ideally limited only by ГZ
→ Δ(1/pT) = 5∙10-5 /GeV (whole tracking system)3 times better than CMS
Options considered: Large silicon trackers (à la ATLAS/CMS) Time Projection Chamber with ≈ 100 µm point resolution (complemented by Si–strip devices)
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Tracker Resolution
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Impact on Detector Design Calorimeter: distinguish W- and Z-bosons in their hadronic decays→ 30%/√E jet resolution!
→ Particle Flow or Dual Readout calorimeter
2 times better than ZEUS
WW/ZZ → 4 jets:
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Detector Challenges at the ILC Bunch timing: - 5 trains per second - 2820 bunches per train separated by 307 ns
no trigger power pulsing readout speed
14 mrad crossing angle Background:
small bunches create beamstrahlung → pairs
backgound not as severe as at LHCbut much more relevant than at LEP
VTX
TPC
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Two Detectors
Additional complication:
One interaction region, but two detectors:
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Two Detectors: Push Pull
Additional complication:
One interaction region, but two detectors:
push pull operation anticipated
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Detector Push-Pull
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The CLIC Two Beam Scheme
No individual RF power
sources
->
CLIC itself is basically
a ~50 km long
klystron...
Two Beam Scheme
Drive Beam supplies RF power• 12 GHz bunch structure• low energy (2.4 GeV - 240 MeV)• high current (100A)
Main beam for physics• high energy (9 GeV – 1.5 TeV)• current 1.2 A
Drive beam - 100 Afrom 2.4 GeV -> 240
MeV(deceleration by extraction of RF
power)
Main beam - 1.2 A from 9 GeV -> 1.5
TeV
QUAD
QUAD
POWER EXTRACTI ONSTRUCTURE
30 GHz - 230 MW
BPM
ACCELERATI NGSTRUCTURES
12 GHz – 68 MW
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CLIC 3 TeV Overall Leyout
Main BeamGeneration Complex
Drive BeamGeneration Complex
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Comparison ILC and CLIC
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CLIC Time Structure
...312...
156 ns
0.5 ns ...312...
> Bunch Spacing
ILC: 337 ns, enough time to identify events from individual BX
CLIC: 0.5 ns, extremely difficult to identify events from individual BX
need short shaping time of pulses
power cycling with 50 Hz instead 5 Hz at ILC
larger power dissipation? does silicon tracker need to be cooled? (not cooled in SiD)
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Why Time Stamping?
> Overlay of physics events with background events fromseveral bunch crossings
degradation of physics performance
> Main background sources from beamstrahlung
e+e- pairs from beamstrahlung photonslow pT, can be kept inside beam pipe with high magnetic field, B > 3 T
hadrons from 2-photon collisions (beamstrahlung photons)can have high pT, reach main tracker and confuses jet reconstructiontypically ~O(1) hadronic background event per BX with pT > 5 GeV tracks
Higgs massreconstructionfromHZ -> bbqq
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Summary of CLIC Challenges + R&D
> Time stamping
most challenging in inner tracker/vertex region
trade-off between pixel size, amount of material and timing resolution
> Power pulsing and other electronics developments
in view of CLIC time structure
> Hadron calorimetry
dense absorbers to limit radial size (e.g. tungsten)
PFA studies at high energy
alternative techniques, like dual/triple readout
> Background
innermost radius of first vertex detector layer
shielding against muon background more difficult at higher E
> Alignment and stability
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Main Differences CLIC as compared to ILC
> Higher energy results in more dense particle jets
Improved double track resolution
Calorimeters with larger thickness and higher granularity
> Much shorter bunch spacing
CLIC 0.5 ns wrt. ILC 337 ns
Requires time stamping
Impact on pulsed power electronics
> Smaller beam sizes and higher energy
Result in more severe background
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Time Lines
ILC Timeline
LHC ResultsCLIC
Feasibility Study
Technical DesignReport 2012
Technical DesignReport 2012
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End of Lecture 1