Obergurgl, 20.06.2004. Damian Pliszka *, Grzegorz P. Karwasz, Roberto S. Brusa, Antonio Zecca, Dipartimento di Fisica, Università Degli Studi di Trento,

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Presentation transcript:

Obergurgl,

Damian Pliszka *, Grzegorz P. Karwasz, Roberto S. Brusa, Antonio Zecca, Dipartimento di Fisica, Università Degli Studi di Trento, Povo (TN) Italia * Institute of Physics, Pomeranian Pedagogical University, Slupsk, Poland

1. Slow positron apparatus 2. Testing 3. High energy mode 4. Deaccelerating mode 5. Benzene results

Schematics INJECTION OPTICS REMODERATOR STAGE FIRST ACCELERATOR DEFLECTOR

First accelerator - wide-angle electrostatic optics where slow positron beam is formed from Na 22 source coupled with 1  m W monocrystal

90  electrostatic spherical deflector - used to prevent high-energy positrons from the source reaching the target

Remoderator stage – second accelerator equiped with electron gun which allows in situ conditioning Cu remoderator film

Injection optics - formed by three aperture electrodes, in focusing conditions a weak longitudinal magnetic field is used, and guides positrons through 10 cm long scattering cell.

Beam modelling First accelerator (SIMION simulation) 30  V V V

Testing 1. Electrons (focusing effect of magnetic field)

1. Electrons (cross sections)

2. Positrons (focusing effect of magnetic field)

2. Positrons (pass - band of deflector)

2.4 eV Energy correction

Benzene results – vs. experiments

Benzene results – vs. theory

Acknowledgements: EPIC – made it possible! Trento is Rome subnode Marco Bettonte Chiara Perazzolli