Abstract:

We propose a number of new investigations on aspects of radiation from high energy electron and positron beams (10-300 GeV) in single crystals and amorphous targets. The common heading is radiation emission by electrons and positrons in strong electromagnetic fields, but as the setup is quite versatile, other related phenomena in radiation emission can be studied as well. The intent is to clarify the role of a number of important aspects of radiation in strong fields as e.g. observed in crystals. We propose to measure trident ‘Klein-like’ production in strong crystalline fields, ‘crystalline undulator’ radiation, ‘sandwich’ target phenomena, LPM suppression of pair production as well as axial and planar effects in contributions of spin to the radiation.

Spokesman:

Ulrik Uggerhøj (homepage)

Related recent papers:

U.I. Uggerhøj: The interaction of relativistic particles with strong crystalline fields, Reviews of Modern Physics 77, 1131 (2005)

 

U.I. Uggerhøj, H. Knudsen, S. Ballestrero, A. Mangiarotti, P. Sona, T.J. Ketel, A. Dizdar, S. Kartal and C. Pagliarone: Formation length effects in very thin targets, Phys. Rev. D 72, 112001 (2005)

 

A. Apyan et al. (NA59): Coherent Bremsstrahlung, Coherent Pair Production, Birefringence and Polarimetry in the 20-170 GeV energy range using aligned crystals, Phys. Rev. ST-AB 11, 041001 (2008)

 

A. Apyan et al. (NA59): Results on the coherent interaction of high energy electrons and photons in oriented single crystals, Nucl. Instr. Meth. B 234, 128 (2005)

 

V.T. Baranov, S. Bellucci, V.M. Biryukov, G.I. Britvich, V.N. Chepegin, Yu.A. Chesnokov, C. Balasubramanian, G. Giannini, V. Guidi, V.I. Kotov, A.E. Kushnirenko, V.A. Maisheev, E. Milan, G. Martinelli, V.A. Pikalov, V.I. Terekhov, U. Uggerhøj, V.N. Zapolsky: First results of investigation of the radiation from positrons in a crystalline undulator, JETP Letters 82, 562 (2005)

 

H.D. Hansen, U.I. Uggerhøj, C. Biino, S. Ballestrero, A. Mangiarotti, P. Sona, T. Ketel and Z.Z. Vilakazi: The LPM effect for multi-hundred GeV electrons, Phys. Rev. D 69, 032001 (2004)

 

H.D. Hansen, U.I. Uggerhøj, C. Biino, S. Ballestrero, A. Mangiarotti, P. Sona, T. Ketel and Z.Z. Vilakazi: Is the electron radiation length constant at high energies?, Phys. Rev. Lett. 91, 014801 (2003)

 

K. Kirsebom, U. Mikkelsen, E. Uggerhøj, K. Elsener, S. Ballestrero, P. Sona and Z.Z. Vilakazi: First measurements of the unique influence of spin on the energy loss of ultrarelativistic electrons in strong electromagnetic fields, Phys. Rev. Lett. 87, 054801 (2001)

 

V.N. Baier and V.M. Katkov: Spectrum and polarization of coherent and incoherent radiation and the LPM effect in oriented single crystal, arXiv:0709.1753

V.N. Baier and V.M. Katkov: Coherent and incoherent radiation from high-energy electron and the LPM effect in oriented single crystal, Phys. Lett. A353 (2006) 91-97

 

V.N. Baier and V.M. Katkov: Coherent and incoherent pair creation by a photon in oriented single crystal, Phys. Lett. A346 (2005) 359-366

 

V.N. Baier and V.M. Katkov: Variation of radiation length due to LPM effect, Phys. Lett. A327 (2004) 202-209

 

V.N. Baier and V.M. Katkov: Concept of Formation Length in Radiation Theory, Phys.Rep. 409 (2005) 261-359

Our studies are relevant in connection to:

Beamstrahlung in the next generation of linear colliders (ILC, CLIC)

Radiation from magnetars - highly magnetized neutron stars

Ultra-high energy cosmic rays

QED-equivalent of Hawking radiation

                 More information here

Our Proposal, Letter of Intent and Status Report 2008.

 

Original presentation at the ’Villars meeting’. Minutes of the SPSC presentations in 2006, 2007, 2007 and 2008.

Papers by NA63:

T. Virkus, U.I. Uggerhøj, H. Knudsen, S. Ballestrero, A. Mangiarotti, P. Sona, T.J. Ketel, A. Dizdar, S. Kartal and C. Pagliarone: Direct measurement of the Chudakov effect, Phys. Rev. Lett. 100, 164802 (2008)

 

H.D. Thomsen, K. Kirsebom, H. Knudsen, E. Uggerhøj, U.I. Uggerhøj, P. Sona, A. Mangiarotti, T.J. Ketel, A. Dizdar, M. Dalton, S. Ballestrero and S. Connell: On the macroscopic formation length for GeV photons, submitted to Phys. Lett. B

 

J. Esberg, K. Kirsebom, H. Knudsen, H.D. Thomsen, E. Uggerhøj, U.I. Uggerhøj, P. Sona, A. Mangiarotti,, T.J. Ketel, A. Dizdar, M. Dalton, S. Ballestrero, S. Connell: Addressing the Klein paradox by trident production in strong crystalline fields, in preparation (2008)

For collaborators:

 

Tsytovich

 

Garibyan

 

Tumanyan