• Home Page for Ulrik Ingerslev Uggerhoj

    Ulrik I. Uggerhøj


     

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    Main research interests in relativistic atomic physics:
  • I am the spokesman of the CERN collaboration NA63.
  • Particle/antiparticle collisions with atoms and solids - Ionization of H, H2 and He and Barkas effect in stopping power
  • Channeling of antiprotons in a silicon crystal
  • Atomic physics with antiprotons under the ASACUSA collaboration, supported by ICE, especially antiproton stopping and ionization of hydrogen
  • Deceleration of antiprotons in the Antiproton Decelerator at the european laboratory for particle physics, CERN, and the ASACUSA Decelerating Radio-Frequency-Quadrupole, RFQD, see also the tests performed in Aarhus
  • Generation of circularly polarized photon beams of high energy - the NA59 collaboration
  • Detection of linear polarization of multi-GeV photons
  • Photoproduction experiments at SLAC - GDH sum rule: E159, J/psi production: E160 and the polarized gluon distribution: E161
  • Gamma-gamma collider - especially the crystal-based option promoted by M. Velasco
  • Investigations of critical field effects, near the Schwinger field E = 1.32e16 V/cm. See also K. McDonalds page.
  • Conversion of photons to electron-positron pairs in the geomagnetic field.
  • Deflection of charged particle beams in bent single crystals - protons and ions, extraction of high energy beams
    • . Paper on the proton-loss during crystal deflection - the crude method.
  • Experiments with positrons - cold, trapped positrons in the EUROTRAPS collaboration
  • Photo-detachment of the negative positronium ion (the QED proton!) - experiments to start autumn 2005
  • Multi-photon ionization of positronium
    • , e.g. the six-photon ionization cross section is 2e17 times larger than for hydrogen while both channel-closing and ponderomotive shifts are also significantly enhanced
  • Penetrability of high energy photons, shower generation and the LPM effect. Succesful new experiment in september 2001 - analysis in progress, first results expected available Sept. 2002
  • Efficient crystal-based tagging of prematurely decayed kaons in the NA48 CP-violation experiment
  • Generation of undulator-like radiation from a crystalline superlattice - see the PECU project
  • The first detection of the spin-flip contribution to the energy loss of ultra-relativistic electrons in strong electromagnetic fields.
    • This was presented at a NATO Advanced Research Workshop in Armenia - see also the pictures.