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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 on theme: "Obergurgl, 20.06.2004. Damian Pliszka *, Grzegorz P. Karwasz, Roberto S. Brusa, Antonio Zecca, Dipartimento di Fisica, Università Degli Studi di Trento,"— Presentation transcript:

1 Obergurgl,

2 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

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

4 Schematics INJECTION OPTICS REMODERATOR STAGE FIRST ACCELERATOR DEFLECTOR

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

6 90  electrostatic spherical deflector - used to prevent high-energy positrons from the source reaching the target

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

8 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.

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

10 Testing 1. Electrons (focusing effect of magnetic field)

11 1. Electrons (cross sections)

12 2. Positrons (focusing effect of magnetic field)

13 2. Positrons (pass - band of deflector)

14 2.4 eV Energy correction

15 Benzene results – vs. experiments

16 Benzene results – vs. theory

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


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