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

Atomic Physics at the 5MV Tandem at Demokritos:
The UOC APAPES project
Dr. Anastasios Dimitriou
University of Crete
&
Institute of Nuclear and Particle Physics, Demokritos, Athens
24th symposium of the Hellenic
Nuclear Physics Society
Ioannina, 22-23 May, 2015
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
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First time in Greece.
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Basic understanding of atomic collision processes (simpler
systems, isoelectronic studies).
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High Resolution Zero-degree Auger Projectile Spectrometry
(ZAPS) from collisions of He-like ions with gas targets. Nonstatistical production of 1s2s2p 4P and 1s2s2p 2P states by ecapture 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).
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
Basic ion-atom collision processes
Atomic
Energy
levels
continuum
Ea - Auger energy
e-e interaction M
L
Ex
K
capture
K
ionization
K-M
excitation
Ion-atom collision
e-
e-
vt
Zp
Vp
b
Projectile
Ion
Charge q+
Zt
M-K
radiative
transition
K
KLM
Auger
transition
 (V p , q, Z p , b, vt , Z t , Ea , Ex ,...)
Atomic Structure: q, Zp, Zt , Ex, Ea…
Collision Dynamics: b, Vp , vt …
Cross section:
HCI: Few-electrons much simpler environment
for testing theories
Special interest: Two-electron processes, electron
correlations and deviations from the independent
particle model
Target
Atom
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
http://apapes.physics.uoc.gr/
THALES 2011-2015: APAPES
Atomic Physics with Accelerators:
Projectile Electron Spectroscopy
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University of Crete
Tandem Laboratory – INPP Demokritos
University of Ioannina
600k€ - experiment at 5 MV Tandem
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
Main team
Dept. of Physics, Univ. of Crete, Heraklion
Theo
Zouros
(Prof & PI)
Anastasios Ioannis
Angelos
Dimitriou Madesis
Laoutaris
(PostDoc) (PhD student) (MS student)
Spiros
Eleonore
Doukas
Defaux
(MS student) (3-month practice)
Univ of Ioannina
ENSICAEN
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
Support Team
5MV Tandem, Institute of Nuclear and Particle Physics
NCSRT Demokritos
Dr. Sotiris
Dr. Tasos
Dr. Michalis
Harissopulos Lagoyannis Axiotis
(Director)
(Res.)
(Res.)
Miltos
Theo
Andrianis Mertzimekis
(Accel. Eng.) (Prof.)
Univ. of
Athens
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
other important
participants
Manolis
Benis
(Prof)
Dept of Physics
Univ of Ioannina
Greece
Bela
Sulik
(Prof)
ATOMKI
Debrecen
Hungary
Experiment
Omer
Sise
(Prof)
Univ of Isparta
Turkey
Genoveva
Martinez-Lopez
(Prof)
Dept Fisica
Aplicada Madrid,
Spain
CPO simulations
Zoom lenses
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
Jose
Paulo Santos
(Prof)
Dept de Fisica
Univ Nova de Lisboa
Portugal
Atomic
Structure
calculations
APAPES: New beam line for atomic physics
November 2011
May 2013
November 2013
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
Demokritos Setup – new beam line today!
Analyzing
magnet
14 m
7.55m
SF6 storage room
Terminal
stripper
9.1 m
Sputter
source
6m
Inflection
magnet
TANDEM Hall
35.45 m
Duoplasmatron
source
switching
magnet
16.9 m
RED target room
L60
R60
L45
R45
R32.5o
R15
L25
GREEN target room
17.4 m
17.3 m
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
Demokritos Setup – Target 6-way cross and
spectroscopy chamber
Turbo
70
Baratron
Spectrometer
chamber
Beam direction
Gas cell
Turbo
550
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
New ZAPS setup: Single stage 00 HDA with
injection lens and 2-D position sensitive detector
Differential
Pumping
ports
Focusing and
retardation
Target gas
nt ~1012 #/cm3
Paracentric
entry
Faraday Cup
HCI
Chamber pressure
~10-7 Torr
Gas in
4-element lens
Inner
hemisphere
Gas Cell
Pressure Gauge
electrons
PSD
X-Position
Y- Position
Timing
E
E
 0.1%,
E
E
APAPES (2015)
Outer
hemisphere
 20%,
accept

 1.4 105
4
Overall efficiency gain ~ 200-500
High Transmission ~ 90%
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
DSP unit from ATOMKI
12V power
supply
Preamps
DSP unit
DSP unit
4P
X-proj
2-D image on PSD
Projection along energy axis
Y-proj
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
Installation of ion beam stripers at the tandem
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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
4+ mixed state beams in collisions
1.
Auger
Electron
Spectra
for
C
2. Comparison with simulations (SIMION)
with various targets at various Energies
6
12 MeV C
4+
W=1521eV,F=4,
VL4 =-684.45V,
VL5=1399.32V
4
6
3
4
5
4+
18 MeV C
W=1521eV, F=4
Ne (20 mTorr)
Fit
4
4
2
4
P
2
S
He
2
P-
2
P+
2
D
0
4
Norm.yields
Norm.fit
H2
2
3
4
2
2
2
2
2
5
Ar (5 mTorr)
Fit
4
P
P-
P
4
2
P+
2
S
1
P-
2
D
2
2
S
230
235
240
245
250
220
Ar
235
240
245
2
P-
P+
2
D
0
225
225
Auger Electron Energy (eV)
230
D
3
220
225
2
2
2
4
P+
Ar (5 mTorr)
Fit
4
0
0
220
2
S
0
3
1
2
P
2
D
0
6
2
0
W=1966eV, F=4
1
2
P-
S
1
P+
4+
Ne (20 mTorr)
Fit
2
-11
0
-11
Normalized electron Yields (x10 ) (arb.units)
Normalized electron Yields (  10 )
Ne
2
P
12 MeV C
250
Auger electron Energy (eV)
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
230
235
240
245
250
So far…..
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Presentations at international conferences:
(CAARI-USA, HCI- Argentina, SPARC- Germany, CDAMOP- India, PIPAMONHungary, SHIM- Germany etc)
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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
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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…
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Finish the installation of terminal and post strippers.
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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.
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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.
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Use different targets such as H2, He, Ne, Ar.
24th symposium of the Hellenic Nuclear Physics Society- Ioannina, 22 May 2015
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