electron spectrometry of highly charged ions: exploring the collision dynamics of few-electron...
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Electron Spectrometry of Highly Charged Ions:
Exploring the collision dynamics of few-electron systems
NuSTAR Demokritos - Athens Feb 2, 2015
Theo J.M. ZourosUniversity of Crete
Atomic Collisions & Electron Spectrometry Laboratory
Basic ion-atom collision processes
Demokritos - Athens Feb 2, 2015
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
Interest in HCIs
Basic understanding of atomic collision processes (simpler systems, isoelectronic studies)
High-Z HCI used to test QED corrections (spectroscopy)
Astrophysical plasmas (Solar Corona etc.) Fusion research (ionization, recombination - plasma
edge modeling, plasma-wall interactions, diagnostics - JET, ITER)
Cometary X-ray emission (Charge-exchange of solar wind HCIs with cometary vapors)
Radiation damage, Therapy of deep-seated localized tumors (energy loss, HCI bombardment of sensitive areas (brain, eye), narrow Bragg peak)
HCI nano-structuring of surfaces (nano-hillock formation, potential sputtering, ITSLEIF EU-network)
Guiding of HCI in insulator nano-capillaries (ITSLEIF) Accelerator physics (source development, lifetime of
particle beams in storage rings) Instrumentation R & D
Demokritos - Athens Feb 2, 2015
Atomic Collision and Electron Spectrometry Laboratory: Interests and Activities
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
Demokritos - Athens Feb 2, 2015
Main Interests
THALES 2011-2015: APAPES
• University of Crete• Tandem Laboratory – INPP Demokritos• University of Ioannina• University of Salonika
600k€ - experiment at 5 MV Tandem
Atomic Physics with Accelerators: Projectile Electron Spectroscopy
Demokritos - Athens Feb 2, 2015
APAPES: First publication!
Demokritos - Athens Feb 2, 2015
http://apapes.physics.uoc.gr/
Demokritos - Athens Feb 2, 2015
APAPES: New beam line for atomic physics
Zero-degree Auger projectile spectrograph
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
Demokritos - Athens Feb 2, 2015
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
Demokritos - Athens Feb 2, 2015
2-D image on PSD Projections
APAPES
Demokritos - Athens Feb 2, 2015
Thank you – good luck NuStar!