Electromagnetic processes in strong crystalline fields, H4 Oct. ’07

1. Electromagnetic processes in strong crystalline fields, H4 Oct. ’07 J.U. Andersen, K. Kirsebom, S.P. Møller, A.H. Sørensen, U.I. Uggerhøj Department of Physics and Astronomy, Aarhus University, Denmark A. Apyan Department of Physics and Astronomy, Northwestern University, Evanston IL, USA P. Sona Institute of Physics, Florence University, Italy S. Ballestrero, S. Connell Schonland Research Institute, Johannesburg, South Africa T. Ketel Science Department, Free University, Amsterdam, The Netherlands M. Khokonov Department of Physics, Kabardino-Balkarian State University, Nalchik, Russian Fed. V. Biryukov, Yu. Chesnokov Institute of High Energy Physics, Protvino, Russia W. Greiner, A.V. Korol, A.V. Solov’yov Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe University, Frankfurt, Germany V. Baier Budker Institute of Nuclear Physics, Novosibirsk, Russia S. Kartal, A. Dizdar Department of Physics, University of Istanbul, Turkey A. Mangiarotti Universidada de Coimbra, Coimbra, Portugal Yu. Kononets Kurchatov Institute, Moscow, Russia

2. Run in H4Oct. 2007Plans U.I. Uggerhøj, SPSC

3. Trident ’Klein-like’ production e+ e- e- Strong field Kimball and Cue, Phys. Rep. 125, 69 (1985) U.I. Uggerhøj, SPSC

4. Pair production LPM effect LPM: Strong multiple scattering within formation length leads to suppression Requires extreme precision to measure in amorphous materials for PP U.I. Uggerhøj, SPSC

5. Pair production LPM effect Equivalent effect in amorphous materials for photon energies  ≈ 5 TeV Tungsten Calculations underway for Ge The relative contribution of the LPM effect (in percent) in tungsten, axis< 111 >. Curve 1 is forT = 293 K and curve 2 is forT = 100 K. U.I. Uggerhøj, SPSC

6. Crystal undulator Solov’yov, Greiner et al. Not to scale U.I. Uggerhøj, SPSC

7. Sandwich target • Sandwich target • 20 layers: Ta – Al – Ta – Al – : ZTa2/ZAl2= 32 • Resonances within formation length Blankenbecler: 2 foils, 25 GeV U.I. Uggerhøj, SPSC

8. Motivation(why still do QED experiments?) U.I. Uggerhøj, SPSC

9. The critical (Schwinger) field • Schwinger, 1949 Quantum corrections to synchrotron radiation emission Relativistic invariant: U.I. Uggerhøj, SPSC

10. Beamstrahlung heavy ions Electric field from one bunch boosted by 22 as seen by the other SLC: χ (or )  10-3 ILC: χ (or )  1 Superstrong field, but of short duration E1s/E0 = 3Z3 Strong lasers Extended nucleus: Z  172 Laser wavelength (and  energy) limited by non-linear Compton scattering χ (or )  1 -collisionscheme (Telnov et al.) U.I. Uggerhøj, SPSC

11. Spin-flip and beamstrahlung Blankenbecler and Drell, ”Quantum treatment of beamstrahlung”, PRD 36, 277 (1987) U.I. Uggerhøj, SPSC

12. Plasma wakefields Transverse focusing forces: Lead to values for realistic parameters: U.I. Uggerhøj, SPSC

13. Magnetars • Magnetars • B  1010 T • relativistic gyration: ħ/mc2 = B/B0 • Electrosphere of strange stars:  ≈ 5-100 T=0.01 MeV T=15 MeV U.I. Uggerhøj, SPSC

14. Strong fields in crystals U.I. Uggerhøj, SPSC

15. Strong crystalline fields U.I. Uggerhøj, SPSC

16. Crystals Extremely strong electric fields 1010-1011 V/cm 50 V / 0.1 Å = 5·1010 V/cm U.I. Uggerhøj, SPSC

17. Klein’s paradox • Reflection coefficient approaches 0 beyond the critical field: Pair production. U.I. Uggerhøj, SPSC

18. Crystal undulator U.I. Uggerhøj, SPSC

19. Crystal undulator Not to scale U.I. Uggerhøj, SPSC

20. Femtosecond laser-ablated crystals 10 microns, laser 200 microns, diamond-blade (state-of-the-art, 2003) U.I. Uggerhøj, SPSC

21. Solov’yov, Greiner et al. U.I. Uggerhøj, SPSC

22. MBE grown crystal 1.5 MeV proton RBS, 0.3 mm beamspot U.I. Uggerhøj, SPSC

23. X-ray measurements U.I. Uggerhøj, SPSC

24. Run in H4Oct. 2007Setup U.I. Uggerhøj, SPSC

25. H4 zone U.I. Uggerhøj, SPSC

26. Pair spectrometer zone (photons) DC5 DC6 DC3 LG DC4 MDX Target He-tank All signal and HV cables and DC gas piping has been installed during week 24 U.I. Uggerhøj, SPSC

27. Pair spectrometer zone (trident) DC5 DC6 DC3 LG vacuum MDX Target He-tank Roll out He-bag, install vacuum U.I. Uggerhøj, SPSC

28. Financing and manpower Money: • Essentially all the equipment is existing and has been tested to be fully functioning • Travel and accomodation (for the danish/german/italian groups) have an allocated budget of about 60 kCHF from FP6, STREP/NEST funding. Manpower: • 3 staff members, 3 technicians and 3 students from Aarhus • Similar numbers from the participants from Italy and South Africa. • Dutch, German, Russian and Turkish participants active during the run, but with fewer persons. • About 20 active members during the beam time, excluding students. We are ready for the October run. U.I. Uggerhøj, SPSC

29. Formation length • Underlying concept for all our proposed expts. Example: 250 GeV electron emitting 1 GeV photon: lf = 0.1 mm U.I. Uggerhøj, SPSC

30. Sandwich target – H4, Oct. 2006 U.I. Uggerhøj, SPSC

31. Quantum-synchrotron Thin target (negl. energy loss) Thick target, 0.2 mm W, NA43 data K. Kirsebom et al. Phys. Rev. Lett. 87 (2001) 054801 γ2/3/γ2 2/3/2 V.N. Baier and V.M. Katkov Phys. Lett. A 353, 91 (2006) Classical = linear U.I. Uggerhøj, SPSC

32. Electromagnetic processes in strong crystalline fields, H4 Oct. ’07 J.U. Andersen, K. Kirsebom, S.P. Møller, A.H. Sørensen, U.I. Uggerhøj Department of Physics and Astronomy, Aarhus University, Denmark A. Apyan Department of Physics and Astronomy, Northwestern University, Evanston IL, USA P. Sona Institute of Physics, Florence University, Italy S. Ballestrero, S. Connell Schonland Research Institute, Johannesburg, South Africa T. Ketel Science Department, Free University, Amsterdam, The Netherlands M. Khokonov Department of Physics, Kabardino-Balkarian State University, Nalchik, Russian Fed. V. Biryukov, Yu. Chesnokov Institute of High Energy Physics, Protvino, Russia W. Greiner, A.V. Korol, A.V. Solov’yov Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe University, Frankfurt, Germany V. Baier Budker Institute of Nuclear Physics, Novosibirsk, Russia S. Kartal, A. Dizdar Department of Physics, University of Istanbul, Turkey A. Mangiarotti Universidada de Coimbra, Coimbra, Portugal Yu. Kononets Kurchatov Institute, Moscow, Russia