malkhaz jabua

October 9, 2008 | Andro Kacharava (JCHP/IKP, FZ-Jülich)

Mit

glie

d d

er

Helm

holt

z-G

em

ein

sch

aft

MALKHAZ JABUA 1st course PhD student of GTU (Supervisors Prof. L. Imnaishvili)

Prof. D. Gotta

Georgian-German school and workshop in Basic Science

READOUT UPGRADE OF THE JUELICH X-ray DETECTOR

10. 08. 2012 TBILISI, GEORGIA

GEORGIAN Technical Universuty (GTU)

ForschungszentrumJuelich / FZJ

Structure of Presentation

MALKHAZ JABUA 10/08/2012 | Slide 2

General overview of what I do

Exeriment I’m involved at Forschungszentrum

What I did and achieved during my stay at Forschungszentrum (Master Thesis)

Activities planned in nearest future

My expectations

Motivation at IKP/ FZJ

One of the target objects - Barium Compounds

Measurement of X-ray energies from various samples at ultimate resolution

Metallic Barium

Barium vapour

Fig. 1 Barium Energy Spectrum


Exploring the details of atomic shells

90 eV

420 meV

1 ch=147 meV

5.8 keV

Lγ 2,5

Fig. 2 X-ray fluorescence

E= h · f

Wavelength 0.01- 10 nm

Energy 120 eV - 120 keV

Shortly about the X-rays

Frequency 3·1016 Hz - 3·1031 Hz

Photon energy

USAGE:

MEDICAL SPHERE: Imaging, diagnosis, treatment Computer tomography Radiotherapy

INDUSTRY : Airport security control Baggage quick check

X-RAY CRYSTALLOGRAPHY : Studing the structure of crystals

or molecules


How we reach the ultimate precision of X-ray ENERGY measurement?

AB=BC=d·sin θB

Bragg Law

Fig .3 Crystal Lattice


nλ=2d·sinθB

E=hc/λ

First order

Spherically bent crystal spectrometers

Advantages:

High efficiency of X-ray detection

Possibility to measure X-rays in an energy interval simultaneously

X-rays reflected from the crystal are focused on detector’s sensitive surface at high precision

Y=RC·sinθB

Fig .4 Scheme of spherically bent crystal spectrometer


Focal Condition

Juelich Spectrometer


Fig .5 Juelich Spectrometer

Working Principle of CCD detector

Fig .6 Detector operates as - „Bucket Brigade“.


Charge createdby photo effect

2 x 3 CCD array

Sensitive area 24 mm x 24 mm per chip

600 x 600 square pixels of size 40 µm per chip

Detector Construction

Fig . 7 Detector Construction.

Detector thickness - 350 µm


Detector Setup

Cooling dewar of detector.

Cryostat valve.

Turbomolecular pump.

Detector chips.

Aluminum shield of detector.

Cooling circuit.

Temperature Isolators.

Detector support.

Temperature distribution inner board.

Inner board for the digital signals distribution.

Outer board for the digital signals distribution.

Fig.8 Detector System.MALKHAZ JABUA 10/08/2012 | Slide 10

Vacuum Cryostat

Vacuum Cryostat

An old readout system that we had when I came to FZJ

Fig. 9 An old readout system structure

1 4

2

3

5

6

P/A


PC

ADC

Drive card 1

Drive card 2

P/A

Analog signal

amplifier

P/A

P/A

P/A

P/A

Clock driver / multiplexor

T. C.

T. A.

Temperature Controller

Temperature

AcquisitionDevice

Weak PointSource of disadvantages

L1-L9R1-R9

Temperatures

Disadvantages of an old readout system

LOW TOTAL SPEED OF READOUT FROM DETECTORS

Reasons: Low efficiency of detector readout software.

Necessity of signal multiplexing, causing additional timing delays.

Solution: Development of the software, simultaneously generating the signals for 6 CCDs, thus effectively eliminating the need of their multiplexing.

Reason: Mix-up of personal computer’s standard electronics and detector’s specific hardware. Solution: Physical and logical separation of upper mentioned hardware resources.


LOW LEVEL OF RELIABILITY AND EFFICIENCY

NEW readout SYSTEM

Projected at ZEL/ FZJ

Vacuum Cryostat

Vacuum Cryostat

Fig.10 The NEW readout scheme for the detectors.

1

2

3

5

6

P/A


P/A

P/A

P/A

P/A

T. C.

T. A.

Fiber

Optics

Temperature

AcquisitionDevice

P/A

4

CRATE1 x opticalPCI bridge

1 x sequencer

2 x ADCs

Temperature Controller

Linux PC

Labview R PC

OuterElectronics

Crate

RENEWED readout system of detectror. What we did here?

L1-L9R1-R9

Temperatures

KeV

KeV

Int KInt

Radioactive source we use at present

55Fe ( 55Mn)*


Mn

Mn

Kβ

Kα

Noise

Fig. 11 ADC spectrum.

First tests with 55Fe

DET. 1 DET. 3

Kα (eV) Lit. 5892

Kβ (eV) Lit. 6490

Kα / Kβ Lit 7.24 ±0.28

DISTANCE TO DETECTOR 10 CM

(eV/Ch) 6.177 6.171

Kβ (eV) 6496 6474

Kα / Kβ 7.3±0.3 9.9±0.4

DISTANCE TO DTECTOR 20 CM

(eV/Ch) 6.151 6.151

Kβ (eV) 6486 6447Kα / Kβ

8.3±0.5 7.8±0.4


channels

counts

What I did and achieved during my stay at IKP/FZJ Juelich

Participation in a detector electronics setup process

Design and realization of detectors’ new readout software and hardware resources and it’s adaption to the demands of real time experiment

Creation of software modules which decodes and logically organizes the data taken from ADC units.

GENERAL GOAL: Flexible and reliable readout system for data processing and analysis

Taking part in a collaboration to set up user friendly temperature monitoring and control system based on LABVIEW software


RESULT: Accelerated system performance by the factor of three

RESULT: New more flexible and user friendly software for CCD data analysis

FUTURE PLANS at IKP/ FZJ


Optimization of the operating parameters of the detectors

Optimization of hardware and software modules serving the system

After successful tests, detector mounting in a crystal spectrometer

X-ray energy measurements from different compounds

FUTURE PLANS at IEK/ FZJ


Research of an internal friction inside solid materials at different temperatures .

Disadvantages of current research appliances:

- Unstability and correspondingly the low precision level of measurements, caused by the use of thread.

- Impossibility of automatization and computerization.

Fig. 12 Design of current infra-low frequency relaxometer for the measurement of an internal Friction inside solid materials at different temperatures.

7-8-9-10 Hanging system for the Pendelum (1) through the thread (7).5- speciment, 6- oven.

NEW type of relaxometer


Fig.13-14. Design of the new infra-low frequency automated relaxometer (without thread) for the measurement of an internal Friction inside solid materials at different temperatures.

Electromagnets for excitation of torsional vibrations –22, lighter – 25, focusing lens –26, mirror –27, differential photoresistor –28.

STEPS TO BE DONE


Build-up and test of an unique appliance for the measurement of an internal friction inside solids materials

Development of software product for readout and analysis of the data taken from experiments

Examination of projected hardware and software resources in real time experimental conditions

High precision measurement and data analysis

Name of research work


Monitoring and control of physical processes inside technological and experimental research appliances

Thanks for your attention

Together we are stronger


malkhaz jabua

Documents

detector system

detector support

detector chips

detector thickness

moleculesmalkhaz jabua

crystal latticemalkhaz

aluminum shield of detector

chip detector constructionfig