Transcript Tasos Dimitriou

Atomic Physics with Accelerators:
The APAPES project of the UOC
Anastasios Dimitriou
University of Crete
&
Institute of Nuclear and Particle Physics, Demokritos, Athens
NUPECC meeting in Athens
Mar 13, 2015
Present Status of APAPES
History and future
Presentation by
Dr. Anastasios Dimitriou (Univ. of Crete)
Post Doctoral researcher of APAPES
NUPECC meeting - Athens 13. 03. 2015
Atomic Physics with Accelerators

First time in Greece

Basic understanding of atomic collision processes
(simpler systems, isoelectronic studies)
High Resolution Electron Spectroscopy
of Li-like Ions produced by e- capture to He-like ions
in collisions with gas targets
Non-statistical production of 1s2s2p 4P and 1s2s2p 2P
states by e- capture to the 1s2s 3S state
NUPECC meeting - Athens 13. 03. 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
Target
Atom
M-K
radiative
transition
K
KLM
Auger
transition
Atomic Structure: q, Zp, Zt , Ex, Ea…
Collision Dynamics: b, Vp , vt …
Cross section:  (Vp , q, Z p , b, vt , Zt , Ea , Ex ,...)
HCI: Few-electrons much simpler
environment for testing theories
Special interest: Two-electron
processes, electron correlations and
deviations from the independent
particle model
NUPECC meeting - Athens 13. 03. 2015
Atomic Collision and Electron Spectrometry Laboratory:
Interests and Activities
Main Interests




Investigation of basic atomic collision mechanisms
Determination of absolute state-selective cross sections
Zero-degree Auger Projectile Spectrometry (ZAPS)
Charge particle optics – development and modeling of
electron spectrometers
THALES 2011-2015: APAPES
Atomic Physics with Accelerators:
Projectile Electron Spectroscopy
•
•
•
University of Crete
Tandem Laboratory – INPP Demokritos
University of Ioannina
600k€ - experiment at 5 MV Tandem
NUPECC meeting - Athens 13. 03. 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)
NUPECC meeting - Athens 13. 03. 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
NUPECC meeting - Athens 13. 03. 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
NUPECC meeting - Athens 13. 03. 2015
Jose
Paulo Santos
(Prof)
Dept de Fisica
Univ Nova de Lisboa
Portugal
Atomic
Structure
calculations
http://apapes.physics.uoc.gr/
NUPECC meeting - Athens 13. 03. 2015
APAPES: New beam line for atomic physics
November 2011
May 2013
November 2013
NUPECC meeting - Athens 13. 03. 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
NUPECC meeting - Athens 13. 03. 2015
Demokritos Setup – Target 6-way cross and
spectroscopy chamber
Turbo
70
Baratron
Spectrometer
chamber
Beam direction
Gas cell
Turbo
550
NUPECC meeting - Athens 13. 03. 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
Gas Cell
Pressure Gauge
Inner
hemisphere
electrons
PSD
X-Position
Y- Position
Timing
Outer
hemisphere
E
E

 0.1%,
 20%,
 1.4 105
E
E accept
4
APAPES (2015)
Overall efficiency gain ~ 200-500
High Transmission ~ 90%
NEPECC meeting - Athens 13. 03. 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
NUPECC meeting - Athens 13. 03. 2015
Y-proj
Auger Electron Spectra for various targets
NUPECC meeting - Athens 13. 03. 2015
So far…..
•
•
•
•
Presentations on 7 international conferences
4 more conference presentations the following days
At least 7 more until September
1 participation on conference proceedings (HCI 2014)
Madesis et al, JPCS 583 (2015) 012014
•
•
1 more participation on conference proceedings in
progress (CDAMOP 2015)
1 Paper submitted for publication on Rev. Scient. Instr.
NUPECC meeting - Athens 13. 03. 2015
In the near future…
•
Go ahead with gas terminal stripper to produce pure
ground state C4+ beam
•
Go ahead with gas/foil post strippers to obtain mixed
state beams at different fractions
•
New Sputter source for the 5MV tandem
•
Go ahead on other ion beams (B, Li, O2, F)
NUPECC meeting - Athens 13. 03. 2015
Enjoy being part of the team!
Researchers night 2013
NUPECC meeting - Athens 13. 03. 2015
The end – thank you for listening
References
Non-statistical results
• Tanis et al. PRL 92 (2004) 133201
• Zouros et al. PRA 77 (2008) 050701
• Strohschein et al. PRA 77 (2008) 022706
• Röhrbein et al, PRA 81 (2010) 042701
Production of pure ground state He-like ion beams
• Benis & Zouros, PRA 65 (2002) 064701
APAPES publications
• Madesis et al, JPCS 583 (2015) 012014
More info? Contact: [email protected]
[email protected]
CDAMOP New Delhi Mar 11-14, 2015