24th symposium of the Hellenic Nuclear Physics Society Ioannina, 22-23 May, 2015 Dr. Anastasios...

24th symposium of the Hellenic Nuclear Physics

Society Ioannina, 22-23 May, 2015

Dr. Anastasios DimitriouUniversity of Crete

&Institute of Nuclear and Particle Physics, Demokritos, Athens

Atomic Physics at the 5MV Tandem at Demokritos: The UOC APAPES project

Present Status of APAPES History and future

Presentation by Dr. Anastasios Dimitriou (Univ. of Crete)Post Doctoral researcher of APAPES

24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015

Atomic Physics with Accelerators

First time in Greece.

Basic understanding of atomic collision processes (simpler systems, isoelectronic studies).

High Resolution Zero-degree Auger Projectile Spectrometry (ZAPS) from collisions of He-like ions with gas targets. Non-statistical production of 1s2s2p 4P and 1s2s2p 2P states by e- capture to the 1s2s 3S state.

Charged particle optics. Development and modeling of electron spectrometers. Simulations and experiments. (comparison with recent and older measurements).

Ongoing research at Demokritos Infrastructure (installation of terminal and post strippers).


Basic ion-atom collision processes

continuum

K

LM

Kcapture

K-M excitation

Ea - Auger energy

KLM Auger

transition

e-e interaction

AtomicEnergylevels

Kionization

Atomic Structure: q, Zp, Zt , Ex, Ea…Collision Dynamics: b, Vp , vt …Cross section: HCI: Few-electrons much simpler environment for testing theoriesSpecial interest: Two-electron processes, electron correlations and deviations from the independent particle model

,...),,,v,,,,( xEEZbZqV attpp

M-K radiativetransition

Ex

VpZp

Zt

b

e- e-

Ion-atom collision

vt

ProjectileIon

Charge q+ TargetAtom


http://apapes.physics.uoc.gr/


THALES 2011-2015: APAPES

• University of Crete• Tandem Laboratory – INPP Demokritos• University of Ioannina

600k€ - experiment at 5 MV Tandem

Atomic Physics with Accelerators: Projectile Electron Spectroscopy

Main team

Dept. of Physics, Univ. of Crete, Heraklion

Theo Anastasios Ioannis Angelos Spiros Eleonore Zouros Dimitriou Madesis Laoutaris Doukas Defaux (Prof & PI) (PostDoc) (PhD student) (MS student) (MS student) (3-month practice) Univ of Ioannina ENSICAEN


Support Team

5MV Tandem, Institute of Nuclear and Particle Physics NCSRT Demokritos

Dr. Sotiris Dr. Tasos Dr. Michalis Miltos Theo Harissopulos Lagoyannis Axiotis Andrianis Mertzimekis (Director) (Res.) (Res.) (Accel. Eng.) (Prof.)

Univ. of Athens


Manolis Bela Omer Genoveva Jose Benis Sulik Sise Martinez-Lopez Paulo Santos (Prof) (Prof) (Prof) (Prof) (Prof)

other importantparticipants

Dept of PhysicsUniv of Ioannina Greece

ATOMKIDebrecenHungary

Univ of Isparta Turkey

Dept Fisica Aplicada Madrid,

Spain

Dept de FisicaUniv Nova de Lisboa Portugal

Experiment CPO simulationsZoom lenses

AtomicStructurecalculations 24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May

2015

APAPES: New beam line for atomic physics

November 2011 May 2013

November 2013


GREEN target room

RED target room

TANDEM Hall

SF6 storage room

35.45 m

9.1

m

7.55m

16.9

m

17.4 m 17.3 m

14 m6

m

R60

R45R32.5o R15 L25

L45L60

Analyzing magnet

switching magnet

Sputter source

Duoplasmatronsource

Inflection magnet

Terminal stripper

Demokritos Setup – new beam line today!


Demokritos Setup – Target 6-way cross and spectroscopy chamber

Turbo 70

Turbo 550

Spectrometer chamber

Gas cell

Beam direction

Baratron


New ZAPS setup: Single stage 00 HDA with injection lens and 2-D position sensitive detector

5104.14

%,20%,1.0

acceptE

E

E

E

Gas in Pressure Gauge

Gas Cell

PSDX-PositionY- Position

Timing

4-element lens

Faraday Cup

Inner hemisphere

electrons

Outerhemisphere

APAPES (2015)

HCI

Target gas nt ~1012 #/cm3Differential

Pumpingports

Focusing and retardation

Chamber pressure~10-7 Torr

Overall efficiency gain ~ 200-500High Transmission ~ 90%

Paracentric entry


DSP unit

DSP unit from ATOMKI

PreampsDSP unit

12V power supply

2-D image on PSD

X-proj

Y-proj

4P

Projection along energy axis 24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May

2015

Installation of ion beam stripers at the tandem

Terminal gas stripper. Placed inside the terminal and produces ground state beams (1s2).

Post foil stripper. Placed in the beam line of the terminal. Necessary to acquire He-like ions at lower energies.

Post Gas stripper. Placed in the beam line of the terminal in order to obtain mixed state beams (1s2, 1s2s) at different fractions and different intensities.

Charge analysis program TARDIS (Transmitted chARge DIStribution) used for calculation of the expected charge states after foil and gas stripping available in (http://apapes.physics.uoc.gr/) 24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May

2015

Experimental results


0

1

2

3

4

5

6

2P-

Ne (20 mTorr) Fit

18 MeV C4+ W=1966eV, F=4

2P+

Nor

mal

ized

ele

ctro

n Y

ield

s (

10-1

1)

2S

4P

2D

0

1

2

3

Ne (20 mTorr) Fit

2S

4P

2P-

2P+2D

220 225 230 235 240 245 250

0

1

2

3

4

5

6

2P-

Ar (5 mTorr) Fit

2S

4P

2P+

2D

220 225 230 235 240 245 250

0

1

2

3

2P-

Ar (5 mTorr) Fit

12 MeV C4+ W=1521eV, F=4

Auger Electron Energy (eV)

2S

4P

2P+

2D

0

2

4

6

Norm.yields Norm.fit

Ne

12 MeV C4+ W=1521eV,F=4, VL4 =-684.45V,VL5=1399.32V

0

2

4

He4P

2P-2P+ 2D

0

2

4

Norm

aliz

ed e

lect

ron Y

ield

s (x1

0-11 )

(arb

.units

)

H2

2S

220 225 230 235 240 245 2500

2

4

Auger electron Energy (eV)

Ar

1. Auger Electron Spectra for C4+ mixed state beams in collisions with various targets at various Energies

2. Comparison with simulations (SIMION)

So far…..

• Presentations at international conferences: (CAARI-USA, HCI- Argentina, SPARC- Germany, CDAMOP- India,

PIPAMON- Hungary, SHIM- Germany etc)

• At least 7 more until September:• (ISIAC- Barcelona, ICPEAC- Toledo etc)

• 3 publications: M. Dogan et al, Rev. Sci. Instrum. 84 (2013) 043105 S. Doukas et al, Rev. Sci. Instrum. 86 (2015) 043111

O. Sise & T. Zouros, J. Spectroscopy 2015 in press • 1 participation in conference proceedings (HCI

2014): Ι. Madesis et al, JPCS 583 (2015) 012014• 3 more participation in conference proceedings in

progress (CDAMOP, PIPAMON). 24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May

2015

In the near future…

Finish the installation of terminal and post strippers.

Installation of Stepping Motor on the PSD in order to investigate the dependence of the energy resolution of the HDA from the distance of the PSD from the focal plane.

Investigation of the systematics of the 4P/2P ratio in an isoelectronic sequence study using He-like ions from Li+ , B3+ , C4+ , N5+ , O6+ , F7+ in the 0.1-2 MeV/u.

Use different targets such as H2, He, Ne, Ar.


Thank you for your attendance

Acknowledgement: This research has been co-financed by the European Union (European Social Fund ESF) and Greek national funds through the Operational Program "Education and Lifelong Learning" of the National Strategic Reference Framework (NSRF) Research Funding Program: THALES. Investing in knowledge society through the European Social Fund, grant number MIS 377289. 24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May

2015

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