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Status: Low-Z LPM Structured target resonance Plans (for 2015): Heavy ion bremsstrahlung

Status: Low-Z LPM Structured target resonance Plans (for 2015): Heavy ion bremsstrahlung Positron production (8 MIMOSAs). STATUS Low- Z LPM Phys. Rev. D 87 , 072007 (2013). Low- Z LPM. Test LPM ( Migdal ) theory in low-Z targets

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Status: Low-Z LPM Structured target resonance Plans (for 2015): Heavy ion bremsstrahlung

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  1. Status: Low-Z LPM Structured target resonance Plans (for 2015): Heavy ion bremsstrahlung Positron production (8 MIMOSAs)

  2. STATUSLow-Z LPMPhys. Rev. D 87, 072007 (2013)

  3. Low-Z LPM Test LPM (Migdal) theory in low-Z targets No indications of insufficiency at level of stat. accuracy Preliminary

  4. Low-Z LPM 20 GeV electrons in Copper: No signs of kink-like structure Pile-up and background dilute the (possible) effect. Preliminary Phys. Rev. D 87, 072007 (2013)

  5. STATUSStructured targetsPhys. Lett. B 732, 309 (2014)

  6. Structured targets – systematic investigation, Phys. Lett. B 732, 309 (2014)

  7. Structured targets Measuring the formation length with a micrometer screw....

  8. STATUSPositron production2012 measurement+DESY test

  9. Angular scans • Radiation enhancement observed w/ 180 GeV electrons (signal = radiation above 50 GeV, ‘strong field radiation’) September 2012, CERN with 1.5 mm diamond:

  10. MIMOSA read-out ASTRID and DESY test

  11. PLANS FOR 2015

  12. (MAMI) Phys. Rev. Lett., accepted Also a testing ground for our simulation code for radiation and pair creation in crystals…

  13. Positron production Factor 15 enhancement at low energies Reduced for thicker targets

  14. Heavy ion bremsstrahlung Radiation emission Peak structure due to finite nuclear size (deBroglie wavelength of virtual photon of order R)

  15. Heavy ion bremsstrahlung

  16. Argon 18+ bremsstrahlung20 AGeV 0 1 2 3 4 5 6 Cross section [mbarn] 0 1 2 3 4 5 6 7 Photon energy

  17. Homogeneously charged sphere Argon 18+ delta-electrons Size of MIMOSA Pointlike nucleus Approx. 1 day of (parasitic) beam in H4 Quantitative statistical analysis of sensitivity underway

  18. Delta-electrons – charge density of the nucleus 150 AGeV Ar18+, 1 day

  19. Publications, NA63 • Since previous SPSC presentation: • K.K. Andersen, S.L. Andersen, J. Esberg, H. Knudsen, R. Mikkelsen, U.I. Uggerhøj, T.N. Wistisen, A. Mangiarotti, P. Sona and T.J. Ketel (CERN NA63): Experimental investigation of the Landau-Pomeranchuk-Migdal effect in low-Z targets, Phys. Rev. D 88, 072007 (2013) • K.K. Andersen, S.L. Andersen, J. Esberg, H. Knudsen, R. Mikkelsen, U.I. Uggerhøj, T.N. Wistisen, A. Mangiarotti, P. Sona and T.J. Ketel (CERN NA63): Measurements of the spectral location of the structured target resonance for ultrarelativistic electrons, Phys. Lett. B 732, 309-314 (2014)

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