vo 260 066 detector and detector systems for particle and ... · pdf filevo 260 066 detector...
TRANSCRIPT
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VO 260 066
Detector and detector systems for particle and nuclear physics I
E-mail: [email protected]
Part 2
Detector 1
Friday 16.1.2015
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SCINTILLATION DETECTORS
Scintillation principle
Inorganic scintillators
Organic scintillators
Light guide
Light detection
Applications
2Detector
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Scintillators – General characteristics
Principle:• dE/dx converted into visible light• detection via photo sensors[e.g. photomultiplier, human eye ...]
Features:• sensitive to energy• fast time response• pulse shape discrimination
Requirements:• high efficiency for conversion of excitation energy to fluorescent radiation
• transparency to its fluorescent radiationto allow transmission of light
• emission of light in a spectral rangedetectable for photo sensors
• short decay time to allow fast response
Plastic ScintillatorBC-412
Detector 3
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Scintillators – basic counter setup
Scintillator Types:• organic scintillators• inorganic crystals• gases
Photo sensors:• photomultipliers• micro-channel plates• hybrid photo diodes• silicon photomultipliers
(SiPMs)
h
Detector 4
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Scintillation Detectors
Energy deposition by a ionizing particle
→ generation
→ transmission of scintillation light
→ detection
Inorganic (crystalline structure)
Up to 40000 photons per MeV
High Z
Large variety of Z and ρ
Un-doped and doped
ns to μs decay times
Expensive
E.m. calorimetry (e, )
medical imaging
radiation hard (100 kGy/year)
Organic (plastics or liquid solutions)
Up to 10000 photons per MeV
Low Z
ρ~1g/cm3
Doped, choice of emission wavelength
ns decay times
Relatively inexpensive
Tracking, TOF, trigger, veto counters,
sampling calorimeters.
medium rad. hard (10 kGy/year)
5Detector
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Some crystals are intrinsic scintillators in which the luminescence isproduced by a part of the crystal lattice itself. However, other crystalsrequire the addition of a dopant, typically fluorescent ions such asthallium (Tl) or cerium (Ce) which is responsible for producing thescintillation light (in both cases is the scintillation mechanism thesame):
The energy is transferred to the luminescent centreswhich then radiate scintillation photons.
For example, in the case of thallium doped sodium iodide (NaI(Tl)),the light output is ~40,000 photons per MeV deposited energy.This high light output is largely due to the high quantum efficiency ofthe thallium ion, disadvantage rather slow (250 ns) decay time.
6Detector
Inorganic scintillators
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Inorganic crystals form a class of scintillating materials with much higher
densities than organic plastic scintillators (typically 4-8 g/cm3) with a
variety of different properties for use as scintillation detectors.
Due to their high density and high effective atomic number, they can be
used in applications where high stopping power or a high conversion
efficiency for electrons or photons is required.
total absorption electromagnetic calorimeters, which consist of a
totally active absorber (as opposed to a sampling calorimeter)
as well as serving as gamma ray detectors over a wide range of
energies.
Many of these crystals also have very high light output, and can therefore
provide excellent energy resolution down to very low energies ( few
hundred keV).
7Detector
Inorganic scintillators
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Scintillation is based on electronsof the C=C bond -bond
Organic scintillatorsare aromatic hydrocarbon compounds containing linked or condensedbenzene-ring structures.Scintillation light arises from transitions made by “free” valenceelectrons of the molecule very rapid decay time ~ ns
Detector 8
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Scintillation principle
9
Material with specialcolour centres
Detector
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Detector 10
Organic scintillators – scintillation mechanism
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Organic scintillators – transparency
Detector 11
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Detector 12
)exp()exp()(sf
tB
tAtN
fast
slow
sum
N(t
)
time t
N(t)...number of emitted photonsA,B....weight factors........decay time (fast, slow)
Decay times
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Time dependence of scintillation pulses(equal intensity at time zero)
Detector 13
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Organic scintillators – properties
Detector 14
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Organic scintillators – properties
Detector 15
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Organic scintillators – propertiesLight yield(in absence of quenching)
𝑑𝐿
𝑑𝑥= 𝑆
𝑑𝐸
𝑑𝑥
S…scintillation efficiency
Quenching non-linear response due to saturation of available states
Birks´ formula accounts for the probability of quenching
𝑑𝐿
𝑑𝑥=
𝑆𝑑𝐸𝑑𝑥
1 + 𝑘𝐵𝑑𝐸𝑑𝑥
kB….Birks´ constant
Detector 16
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17Detector
10°C
30°C
Temperature dependence of the Scintillator Bicron BC-400
UPPSALA UNIVERSITY,
internal report
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Some remarks
Aging and Handling:
Plastic scintillators are subject to aging which diminishes the light yield. Exposure to
solvent vapors, high temperatures, mechanical flexing, irradiation, or rough
handling will aggravate the process.
A particularly fragile region is the surface which can “craze” - develop micro-cracks
- which rapidly destroy the capability of plastic scintillators to transmit light by total
internal reflection. Crazing is particularly likely where oils, solvents, or fingerprints
have contacted the surface.
Attenuation length:
The Stokes' shift is not the only factor determining attenuation length. Others are
the concentration of fluorines (the higher the concentration of a fluorine, the greater
will be its self-absorption); the optical clarity and uniformity of the bulk material; the
quality of the surface; and absorption by additives, such as stabilizers, which may
be present.
18Detector
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Some remarksAfterglow:
Plastic scintillators have a long-lived luminescence which does not follow a simple
exponential decay. Intensities at the 10−4 level of the initial fluorescence can persist
for hundreds of ns.
Radiation damage:
Irradiation of plastic scintillators creates coluor centres which absorb light more
strongly in the UV and blue than at longer wavelengths. This poorly understood
effect appears as a reduction both of light yield and attenuation length. Radiation
damage depends not only on the integrated dose, but on the dose rate,
atmosphere, and temperature, before, during and after irradiation, as well as the
materials properties of the base such as glass transition temperature, polymer
chain length, etc.
19Detector
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Detector 20
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Detector 21
Pulse shape discrimination, e.g. BaF2
Barium fluoride (BaF2) is presently one of the fastest scintillator.
It has an emission component with sub-nanosecond decay time.
Time resolutions of ~200 ps are possible.
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Detector 22
Light output of inorganic crystals shows strong
temperature dependence
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Energy dependence of the light output
normalised to 450 keVnormalised to 450 keV
Detector 23
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Scintillation emission spectra for BaF2at various temperatures
Detector 24
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25Detector
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26Detector
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Inorganic Scintillators expensiveAdvantages
high light yield [typical ε ~ 0.13]high density [e.g. PWO ~ 8.3 g/cm3]good energy resolution
Disadvantages complicated crystal growthlarge temperature dependence
Organic Scintillators cheapAdvantages
very fasteasily shapedsmall temperature dependence
Disadvantages lower light yield [typical ε ~ 0.03]radiation damage
Detector 27
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Scintillation in liquid Nobel gases
Detector 28
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Light transmission through light guides
In coupling a scintillator to a photodetector through a lightguide, it is tempting to couple a large area scintillator to asmall area detector.
This could save money and also small photodiodescould be used
BUT, the efficiency of light transmission through a lightguide is limited by
the angle of total reflection conservation of phase space (Liouville’s theorem)
Detector 29
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Light guide – different geometries
“fish tail”
“adiabatic”
Detector 30
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0
1c
n
narcsin
Light guide – conditions at the interface of dissimilar
optical media (n0>n1)
Detector 31
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Light guide – variation of pulse height with length
total internal reflection
total internal reflectionwith reflective covering
surface painted – NE reflector paint
d…..specular reflector, wo. light guide e…..diffuse reflector, e.g. TeflonDetector 32
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Detector33
Purpose: Convert light into detectable electronics signal – usually we are
interested in the visible and UV region
Photo detectors
standard requirement
high sensitivity, usually expressed
as quantum efficiency photons
ronsphotoelect
N
NQE
(nm)
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34
Photon detectors - Photo Multiplier Tube
main phenomena:
• photo emission from photo cathode
• secondary emission from dynodes.
dynode gain g=3-50
e.g. total gain for 10 dynodes,
with g=4
G = 410 ~ 106
Purpose:
Convert light into detectable
(electronic) signal
Detector
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PM Tube
Detector 35
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Photo Multiplier Tube - Dynode chain
e.g. total gain for 10 dynodes,
with g=4
G = 410 ~ 106
Detector 36
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Noise, measured “dark spectrum”
cou
nts
per
ch
ann
el
Pulse height spectrum measured with Hamamatsu PMT R5912 due to a single electron emitted spontaneouslyDetector 37
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Detector 38
QE’s of typical photo-cathodes
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Detector 39
Transmission of optical windows
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40Detector
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41Detector
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Detector 42
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Microchannel plate
Detector 43
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Microchannel plate – chevron configuration
Detector 44
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Silicon Photomultipliers (SiPMs) are novel, solid statebased low level light detectors.
Due to their distinguished properties,• very high quantum efficiency compared to PMTs• much higher gain compared to APDs,
they are able to replace PMTs and APDs in manyapplications.
Silicon Photomultipliers (SiPMs)
Detector 45
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Silicon Photomultiplier – operated in Geiger mode
Breakdown, quench and reset cycle of a photodiode working in the Geiger mode
“digital” pulse output from aphotodiode working in Geigermode
An array of microcells(photodiode plus quenchresistor) with summedoutput
Detector 46
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Photoelectron spectrum of a SiPM, using brief, low-level light pulses
Oscilloscope shot showingthe discrete nature of SiPMoutput when illuminatedby brief pulses of low-levellight
Silicon Photomultiplier – single photon counting
Detector 47
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48
Radiation spectroscopy with scintillators
The main interactions of X-rays and -rays in matter are:
• photoelectric effect
• Compton scattering
• pair production
Detector
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Compton scattering
head-on collision:
for h >> m0c2
Detector 49
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Shape of the Compton continuum for various gamma-ray energies
Detector 50
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Detector 51
“Small” detectors – response function
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Detector 52
“Very large” detectors – response function
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Detector 53
Intermediate size detectors – response function
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Detector 54
Effects of surrounding materials - shielding
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Detector 55
Response function – NaI(Tl)
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Detector 56
Response function – NaI(Tl)
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SiPM – Silicion photo multiplier(Avalanche Photodiodes)
EU-FP7 HP2: WP28 – SiPM EU-FP7 HP3: WP28 - SiPM
Test of different types of SiPM:SiPM Photonique, KETEK, FBK TrentoMPPC Hamamatsu(Multi-pixel Photo Counter)
Basic performance of SiPMs, like:timing, amplification, stability
FOPISIDDHARTA-2PANDAAMADEUS
Detector 57
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SiPM – Silicion Photo Multiplier
Detector 58
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• differential diode readout• accurate bias control• on-board discriminator• differential signal output: balanced analogue signal and LVDS
trigger• remote slow control
SiPM frontend electronics
Detector 59
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Detector 60
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SiPM - time resolution measurement
Detector 61
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Setup - time resolution measurement
Detector 62
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Detector 63
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Application of SiPM: position-sensitive detectors
JZ / Nov. 10, 2010Detector
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SiPM array
Detector 65
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16-channel pre-amplifier board
Detector 66
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Detector 67
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Detector 68
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Conclusions
Detector 69
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Detector
octagonal hodoscope2 layers, composed of 32 scintillating bars
Application of SiPMs – Hbar-Hodoscope
70
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Application of SiPM
Beam profile monitor for FOPI (3 GeV/c protons)
Detector 71
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Positron Emission Tomography - PETImprovements due to Time-of-Flight measurement
Detector 72
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Time-of-Flight for PET
Detector 73
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Motivation: PET + Time of flightPositron Emission Tomography
Detector 74
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SciTil R&D for PANDA
Detector 75
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Detector 76
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Detector 77
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Detector 78
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R&D with digital SiPM (DPC) – experimental setup
Detector 79
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Detector 80
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Detector 81
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R&D with conventional SiPM – experimental setup
Detector 82
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Conventional SiPM – pulse height spectrum
Detector 83
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Detector 84
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Detector 85
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Detector 86
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VIP-2 apparatus – SiPMs/SDDs
Detector87
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Application of SiPMs π beam profile monitor for FOPI
Detector88
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Detector 89
Radiation protection
Recommended units SI units given by International Commission on
Radiation Units and Measurements (ICRU), other common units in
parentheses:
Unit of activity = becquerel (curie):
1 Bq = 1 disintegration per second [ s−1 ] (= 1/3.7x1010 [Ci])
Unit of absorbed dose in any material = gray (rad):
1 Gy = 1 joule kg−1 (= 104 erg g−1 = 100 rad)
= 6.24x1012 MeV kg−1 deposited energy
Unit of equivalent dose (for biological damage) = sievert
(= 100 rem, roentgen equivalent for man):
Equivalent dose HT [Sv] in an organ T is equal to the absorbed
dose in the organ DR [Gy] times the radiation weighting factor wR (formerly
the quality factor Q, but wR is “new” defined for the radiation incident on
the body).
RRT DwH
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Detector 90
Radiation protection
Radiation weighting factors
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Detector 91
Radiation protection
The sum of the equivalent doses,
weighted by the tissue weighting
factors wT of several organs and
tissues of the body that are
considered to be most sensitive, is
called “effective dose” E:
RT
R
RT DwH ,
T
T
T HwE
If there is more than one radiation type present, the sum of the
absorbed dose has to be summed up:
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Detector 92
Natural annual background, all sources:
Most world areas, whole-body equivalent dose rate ~(0.4 - 4) mSv
(40 - 400 mrem), can range up to 50 mSv (5 rem) in certain areas.
U.S. average 3.6 mSv, including 2 mSv from inhaled natural
radioactivity, mostly radon and radon daughters.
(Average is for a typical house and varies by more than an order of
magnitude. It can be more than two orders of magnitude higher in
poorly ventilated mines. 0.1 - 0.2 mSv in open areas).
Cosmic ray background in counters (sea level, mostly muons):
1 min−1 cm−2
Recommended limits to exposure of radiation workers (whole-body
dose):
EU: 20 mSv yr−1
U.S.: 50 mSv yr −1 (5 rem yr−1)
Natural radiation background
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Detector 93
Average dose per person
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Biological effectsSequence of events
occurring in living
matter due to
radiation
• genetic effects
• somatic effects
cancer
sterility 94Detector
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Detector 95
Neutrons dominate the particle environment outside thick shielding (> 1 m)
for high energy (> a few hundred MeV) electron and hadron accelerators.
Prompt neutrons at accelerators
Electron beams:
At electron accelerators neutrons
are generated via photo-nuclear
reactions from bremsstrahlung
photons.
Neutron yields from semi-infinite
targets per unit electron beam
power, as a function of electron
beam energy.
Energy distribution of produced
neutrons:TEn
n
neT
E
dE
dN /
2
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Detector 96
Proton beams: At proton accelerators the emitted neutron yields per
incident proton for different target materials are roughly independent of
proton energy between 20 MeV and 1 GeV, and given by the ratio
C:Al:Cu-Fe:Sn:Ta-Pb = 0:3 : 0:6 : 1:0 : 1:5 : 1:7.
Above 1 GeV the neutron yield is proportional to Em (0.80 < m < 0.85).
Prompt neutrons at accelerators
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Detector 97
Leading Edge Triggering
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Detector 98
Zero-Crossing Triggering
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Detector 99
Constant FractionTriggering