malkhaz jabua
DESCRIPTION
Forschungszentrum Juelich / FZJ. GEORGIAN Technical Universuty (GTU). MALKHAZ JABUA. 1 st course PhD student of GTU (Supervisors Prof. L. Imnaishvili) Prof. D. Gotta. READOUT UPGRADE OF THE JUELICH - PowerPoint PPT PresentationTRANSCRIPT
October 9, 2008 | Andro Kacharava (JCHP/IKP, FZ-Jülich)
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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
MALKHAZ JABUA 10/08/2012 | Slide 3
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
MALKHAZ JABUA 10/08/2012 | Slide 4
How we reach the ultimate precision of X-ray ENERGY measurement?
AB=BC=d·sin θB
Bragg Law
Fig .3 Crystal Lattice
MALKHAZ JABUA 10/08/2012 | Slide 5
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
MALKHAZ JABUA 10/08/2012 | Slide 6
Focal Condition
Juelich Spectrometer
MALKHAZ JABUA 10/08/2012 | Slide 7
Fig .5 Juelich Spectrometer
Working Principle of CCD detector
Fig .6 Detector operates as - „Bucket Brigade“.
MALKHAZ JABUA 10/08/2012 | Slide 8
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
MALKHAZ JABUA 10/08/2012 | Slide 9
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
MALKHAZ JABUA 10/08/2012 | Slide 11
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.
MALKHAZ JABUA 10/08/2012 | Slide 12
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
MALKHAZ JABUA 10/08/2012 | Slide 13
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)*
MALKHAZ JABUA 10/08/2012 | Slide 14
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
MALKHAZ JABUA 10/08/2012 | Slide 15
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
MALKHAZ JABUA 10/08/2012 | Slide 16
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
MALKHAZ JABUA 10/08/2012 | Slide 17
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
MALKHAZ JABUA 10/08/2012 | Slide 18
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
MALKHAZ JABUA 10/08/2012 | Slide 19
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
MALKHAZ JABUA 10/08/2012 | Slide 20
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
MALKHAZ JABUA 10/08/2012 | Slide 21
Monitoring and control of physical processes inside technological and experimental research appliances
Thanks for your attention
Together we are stronger
MALKHAZ JABUA 10/08/2012 | Slide 22