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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.

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Presentation on theme: "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."— Presentation transcript:

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 26.06.07 U.I. Uggerhøj, SPSC 2 Run in H4 Oct. 2007 Plans

3 26.06.07 U.I. Uggerhøj, SPSC 3 Trident ’Klein-like’ production Kimball and Cue, Phys. Rep. 125, 69 (1985) Strong field e+e+ e-e- e-e-

4 26.06.07 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

5 26.06.07 U.I. Uggerhøj, SPSC 5 Pair production LPM effect The relative contribution of the LPM effect (in percent) in tungsten, axis. Curve 1 is forT = 293 K and curve 2 is forT = 100 K. Equivalent effect in amorphous materials for photon energies  ≈ 5 TeV Calculations underway for Ge Tungsten

6 26.06.07 U.I. Uggerhøj, SPSC 6 Crystal undulator Not to scale Solov’yov, Greiner et al.

7 26.06.07 U.I. Uggerhøj, SPSC 7 Sandwich target Sandwich target Sandwich target 20 layers: 20 layers: Ta – Al – Ta – Al – : Z Ta 2 /Z Al 2 = 32 Resonances within formation length Resonances within formation length Blankenbecler: 2 foils, 25 GeV

8 26.06.07 U.I. Uggerhøj, SPSC 8 Motivation (why still do QED experiments?)

9 26.06.07 U.I. Uggerhøj, SPSC 9 The critical (Schwinger) field Schwinger, 1949 Quantum corrections to synchrotron radiation emission Relativistic invariant:

10 26.06.07 U.I. Uggerhøj, SPSC 10 Beamstrahlung heavy ions SLC: χ (or  )  10 -3 ILC: χ (or  )  1 Electric field from one bunch boosted by 2  2 as seen by the other Superstrong field, but of short duration E 1s / E 0 =  3 Z 3 Extended nucleus: Z  172 Strong lasers Laser wavelength (and  energy) limited by non-linear Compton scattering χ (or  )  1  -collision scheme (Telnov et al.)

11 26.06.07 U.I. Uggerhøj, SPSC 11 Spin-flip and beamstrahlung Blankenbecler and Drell, ”Quantum treatment of beamstrahlung”, PRD 36, 277 (1987)

12 26.06.07 U.I. Uggerhøj, SPSC 12 Plasma wakefields Transverse focusing forces: Lead to values for realistic parameters:

13 26.06.07 U.I. Uggerhøj, SPSC 13 Magnetars Magnetars B  10 10 T relativistic gyration: ħ  /mc 2 =  B/B 0 Electrosphere of strange stars: Electrosphere of strange stars:  ≈ 5-100 T=0.01 MeV T=15 MeV

14 26.06.07 U.I. Uggerhøj, SPSC 14 Strong fields in crystals

15 26.06.07 U.I. Uggerhøj, SPSC 15 Strong crystalline fields

16 26.06.07 U.I. Uggerhøj, SPSC 16 Crystals Extremely strong electric fields 10 10 -10 11 V/cm 50 V / 0.1 Å = 5·10 10 V/cm

17 26.06.07 U.I. Uggerhøj, SPSC 17 Klein’s paradox Reflection coefficient approaches 0 beyond the critical field: Reflection coefficient approaches 0 beyond the critical field: Pair production.

18 26.06.07 U.I. Uggerhøj, SPSC 18 Crystal undulator

19 26.06.07 U.I. Uggerhøj, SPSC 19 Crystal undulator Not to scale

20 26.06.07 U.I. Uggerhøj, SPSC 20 10 microns, laser 200 microns, diamond-blade (state-of-the-art, 2003) Femtosecond laser-ablated crystals

21 26.06.07 U.I. Uggerhøj, SPSC 21 Solov’yov, Greiner et al.

22 26.06.07 U.I. Uggerhøj, SPSC 22 MBE grown crystal 1.5 MeV proton RBS, 0.3 mm beamspot

23 26.06.07 U.I. Uggerhøj, SPSC 23 X-ray measurements

24 26.06.07 U.I. Uggerhøj, SPSC 24 Run in H4 Oct. 2007 Setup

25 26.06.07 U.I. Uggerhøj, SPSC 25 H4 zone

26 26.06.07 U.I. Uggerhøj, SPSC 26 Tunnel zone DC1 vacuum

27 26.06.07 U.I. Uggerhøj, SPSC 27 Beam definition zone DC3 vacuum

28 26.06.07 U.I. Uggerhøj, SPSC 28 Pair spectrometer zone (photons) DC3 He-tank MDX DC5DC6 LG Target DC4 All signal and HV cables and DC gas piping has been installed during week 24

29 26.06.07 U.I. Uggerhøj, SPSC 29 Pair spectrometer zone (trident) DC3 vacuum He-tank MDX DC5DC6 LG Target Roll out He-bag, install vacuum

30 26.06.07 U.I. Uggerhøj, SPSC 30 Financing and manpower Money: Essentially all the equipment is existing and has been tested to be fully functioning 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. 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 3 staff members, 3 technicians and 3 students from Aarhus Similar numbers from the participants from Italy and South Africa. Similar numbers from the participants from Italy and South Africa. Dutch, German, Russian and Turkish participants active during the run, but with fewer persons. Dutch, German, Russian and Turkish participants active during the run, but with fewer persons. About 20 active members during the beam time, excluding students. About 20 active members during the beam time, excluding students. We are ready for the October run.

31 26.06.07 U.I. Uggerhøj, SPSC 31 Formation length Underlying concept for all our proposed expts. Underlying concept for all our proposed expts. Example: 250 GeV electron emitting 1 GeV photon: l f = 0.1 mm

32 26.06.07 U.I. Uggerhøj, SPSC 32 Sandwich target – H4, Oct. 2006

33 26.06.07 U.I. Uggerhøj, SPSC 33 Quantum-synchrotron Classical = linear Thin target (negl. energy loss) Thick target, 0.2 mm W, NA43 data K. Kirsebom et al. Phys. Rev. Lett. 87 (2001) 054801 V.N. Baier and V.M. Katkov Phys. Lett. A 353, 91 (2006) γ 2/3 / γ 2   2/3 /  2

34 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

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