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!