of quasi monochromatic radiation for phase contrast x … · the fifth frenchthe fifth...

Accelerators based compact sourcesAccelerators based compact sources of quasi‐monochromatic radiation f h i ifor phase‐contrast X‐ray imaging

Oleksandr Lebed

The fifth French-Ukrainian workshopThe fifth French-Ukrainian workshop on the instrumentation developments for HEP

Orsay, France, LAL, November 6-8, 2017

Participation of IAP in LIA IDEATE

Institute of Applied Physics National Academy of Sciences of Ukraine

(S Uk i )(Sumy, Ukraine)

The LIA IDEATE covers R&D and optimisation of innovative technologies for the experiments at the particle accelerators and development of accelerator techniques.

Research program and projects R&D of detector technologies Accelerator techniques Accelerator techniques Experimental platforms R&D on instrumentation for medical applications D l f fl h i Developments for flavour physics Developments for nuclear physics Developments for hadron physics

Phase‐contrast X‐ray imaging

Pedagogical activities2Accelerators based sources of X‐ray for phase‐contrastO. Lebed, IAP NAS of Ukraine, LAL, 6 November 2017,

Phase‐contrast X‐ray imagingPhase‐contrast X‐ray imaging (PCI) is a general term for different technical methods that use information concerning changes in the phase of an X‐ray beam that passes through an object in order to create its images.

the phase shift

an exponential decay factor decreasing the amplitude of the wave

42 4k 2k

3Accelerators based sources of X‐ray for phase‐contrastO. Lebed, IAP NAS of Ukraine, LAL, 6 November 2017,

Phase‐contrast X‐ray imaging.Experimental realisationExperimental realisation

Crystal interferometry Grating Bonse‐Hart Analyzer‐based imaging P ti b d i i Propagation‐based imaging Edge‐illumination Grating‐based imaging g g g

(Talbot interferometry)

Required characteristic of radiation for X‐ray phase contrast

E ∆E/E S i Si th bj t Fl th bj t C hEnergy range ∆E/E Source size Size on the object Flux on the object Coherence

> 10 keV 3% small 50 cm > 10^(9) ph/s yes


Accelerators based compact source of quasi‐monochromatic X‐ray at IAP NASU


Multimatrix X‐Ray detector for phase contrast imaging experiments

B i t

partial image

mag

ebr

atio

n

light sensors(CCD matrixes)

Basic parametersSensitive Area 90x60mmOptical Configuration 2x2 cellsDQE(0) 0 44

overlapping area ofpartial images

restored imagein digital form

partial image

X-Ray Image

sign

al p

roce

ssin

g, i

rest

orat

ion,

aut

o-ca

liDQE(0) 0.44Optical Resolution up to 12 pl/mm Dynamic Range equal to 14bitsEnergy of detected X- 9-100keV (for different

r

X R t i ibl li ht t

optical interface(lenses)

Ray quantum conversional screens)Frame rate 15-150 FPSExternal digital interface Gigabit Ethernet

X-Ray to visible light convertor(fluorescent screen)

Optical scheme of the detector

X-Ray to visible light convertor(fluorescent screen) optical interface

light sensors (CCDmatrixes)(fluorescent screen) optical interface

(lenses)matrixes)

3D CAD Driwing of the Multimatrix Hybrid X‐Ray DetectorPhoto of the Multimatrix Hybrid X‐Ray Detector


Compton backscattering process

1 1 /

Energy of X‐ray photons, which are emitted by a relativistic electron in collision with the laser pulse

2

2 2

2 1 cos1

iX


X‐ray sources based on Compton backscattering

ThomX - Conceptual Design Report


The spectral line broadening

Estimation of spectral line broadening for the parameters of ThomX source

2

0 2 2

2 1 cos1

iX

Estimation of spectral line broadening for the parameters of ThomX source

1

Electron energy dispersion

22 1 cos 2 2

/ 0.6%

0

302 2

2 1 cos1 10

12 2 i X

XX X

Spectral width of pulsed laser / 2 / 0.35%

3

0 1 10XXX

XX

00

XX

X 00X X

The same energy width corresponds of X‐ray emission angle 1 mradgy p y g

2 2 2

_2

tan2

X

X

ii Nonlinear Effects

X


Compton backscattering process.Accounting of a pulse character of the laser field

i f Xp k p k Conservation law

Four‐potential of pulsed laser wave

pul monA g A

Four potential of pulsed laser wave

1

2pulN

Quasi‐monochromatic condition

Klein ‐Nishinа formula can be summarized in the case, when an external laser field has a pulsed character. The energy of X‐ray photon has a finite spectral width even at the fixed emission angle. The differential probability of one‐photon Compton backscattering :

/

0

cose

pul x f iKN e

dW N d g d g E EdW


Compton backscattering process.Accounting of a pulse character of the laser field


Thank you for attention!

of quasi monochromatic radiation for phase contrast x … · the fifth frenchthe fifth...

Documents