1 / 17

Institute of Nuclear Research of the Hungarian Academy of Science s (ATOMKI), Hungary

Charged particle guiding through insulator capillaries – from discovery to application. Károly Tőkési. Institute of Nuclear Research of the Hungarian Academy of Science s (ATOMKI), Hungary. Collaborators. Réka Bereczky István Rajta Gyula Nagy

xanthus-mcmillan
Download Presentation

Institute of Nuclear Research of the Hungarian Academy of Science s (ATOMKI), Hungary

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Charged particle guiding through insulator capillaries – from discovery to application Károly Tőkési Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Hungary

  2. Collaborators Réka Bereczky István Rajta Gyula Nagy Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Debrecen, Hungary

  3. gold coating Neq+ q Ne7+ observation angle y tilt angle Mylar foil Transmission of HCI through insulating nanocapillaries Mylar – Nanocapillaries, Stolterfoht et al., PRL 2002

  4. trajectory simulation for projectiles charge up of insulating surface deflection of projectiles random walk simulation for charge transport Ion guiding Scenario / simulation steps: qout qin Zq+

  5. Capillarycharging Schiessl et al., PRA 72, 062902 (2005); PRL 102, 163201 (2009).

  6. History New type of the particle-transport with various samples: - Nanocapillaryarrays Many uncertainties both from experimentaland theoretical points of view: • It is not possible toensure a perfect parallelism of the nanocapillaries in the foil. • The collective effect of all theneighboring tubes has to be taken into account. • Charge deposition using highly charged ions. - Single microcapillary − technical applications It istechnically not possible to perform measurements with a singlenanotube. Previous experiments: - slow, highly charged ions (Ne7+, Ar9+) - slow and fast electrons - positron

  7. Motivation and the aim of the recent studies USING - single straight microcapillary - single charged and fast ion - focused microbeam TARGET - visualization - charge state separation - measure the energy spectra of the transmitted particles during transmission

  8. Sample Material: Teflon (Polytetrafluoroethylene) Parameters: Diameter: 800 μm, Length: 44,15 mm, Aspect ratio: ~ 55 The position The capillary tilt angle relative to the beam axis is 1o (tilted in horizontal direction).

  9. Sample positioning With a 5-axis goniometer using optical microscope and RutherfordBackscattering (RBS) mapping:

  10. Experimental setup • Intensity: by a Faraday cup, placed behind the sample • Energy spectra: by a solid state particle detector with about 100-1000 protons/s intensity • The beam: 1 MeV proton microbeam • Spot size: 1 μm • Beam divergence: 0.01o in the vertical and 0.3o in the horizontal direction

  11. Results Tilt angle: 0° Tilt angle: 1°

  12. MOVIE

  13. Time evolution 500 eV electron transmission through single straight glass microcapillary Tilt angle 2º B.S. Dassanayake, R.J. Bereczky, S. Das, A. Ayyad, K. Tőkési and J.A. Tanis, Phys. Rev. A 83 (2011) 012707.

  14. Applicatons

  15. hagyományos nagyenergiájú ionnyaláb kapilláris ion Before irradiation 21 hours later a) b) kapilláris sejtmag Kapilláris sejtszerv besugárzott terület sejt Sejttartó tálka Living cell irradiation

  16. Conclusions • Weobservedguidingeffectfor a macroscopicsize teflon capillarywithhighenergy proton microbeam. • Gradualincreasefromabout 20% to over 90%, wherethestabletransmission is reached. • 3 differentstagesintheenergydistribution: • Onlyinelasticallyscatteredcontributionwithlowerthan 1 MeVenergy • The elasticcontributionbecomes more and more significant • Onlythe 1 MeV peak due to the guiding effect • Application – Proton therapy - cell irradiation TO BE CONTINUED

  17. Thank you!

More Related