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Atomic Physics with Accelerators: Projectile Electron Spectroscopy
at the NCSR Demokritos Tandem accelerator
Abstract
The only existing heavy ion accelerator in Greece,
the 5.5MV Τ11/25 TANDEM Van de Graaff at the National Research Center
"Demokritos" in Athens has been used to date primarily for investigations
centering around nuclear physics. Here, we propose to establish
the new (for Greece) discipline of Atomic Physics with Accelerators,
a strong field in the EU with important contributions to fusion,
hot plasmas, astrophysics, accelerator technology and basic atomic
physics of ion-atom collision dynamics, structure and technology.
This will be accomplished by combining the existing interdisciplinary
atomic collisions expertise from three Greek universities, the strong
support of distinguished foreign researchers and the high technical
ion-beam know-how of the TANDEM group into a cohesive initiative.
Employing the TANDEM as a user facility, collaborative experiments
will be conducted using state-of-the-art technology, while young
researchers will gain valuable hands-on expertise.
Work packages include the design and implementation
of a:
- New dedicated beam line
- Gas and foil strippers for the intense production of highly
charged ions at the TANDEM
- Specialized high-vacuum collision chamber for performing Zero-degree
Auger projectile spectroscopy (ZAPS) utilizing state-of-the-art
equipment
- Doubly differentially
pumped gas target
- Data acquisition/control system for running the
experiment
The hiring of dedicated postdoc including graduate
and undergraduate students will be extremely important for the overall
success of the project.
Using the new ZAPS setup we shall complete a much needed
systematic isoelectronic investigation of K-Auger spectra emitted
from collisions of pre-excited ions with gas targets using novel
techniques. Our results are expected to lead to a deeper understanding
of the neglected importance of cascade feeding of metastable states
in collisions of ions with gas targets and further elucidate their
role in the non-statistical production of excited three-electron
states by electron capture, recently a field of conflicting interpretations
awaiting further resolution.
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