Experimental investigation of strong field trident production

Esberg, J.; Kirsebom, K.; Knudsen, H.; Thomsen, Heine; Uggerhøj, E.; Uggerhøj, U. I.; Sona, P.; Mangiarotti, A.; Ketel, T.; Dizdar, A.; Dalton, M. M.; Ballestrero, S.; Connell, S. H.

doi:10.1103/physrevd.82.072002

Cited by 12 publications

(8 citation statements)

References 35 publications

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“…Finally, we note that our previous experiment on ''tridents'' [16], where a factor 2-3 disagreement with theory was found, was performed with a setup very similar to that presented here, and with the same type of target crystal. The present findings support our interpretation that the explanation for the disagreement reported there is likely to be due to effects not included in the theory.…”

Section: Discussionmentioning

confidence: 99%

“…c the critical frequency of the emitted synchrotron radiation. This condition-not included in his original manuscript [2]-he wrote as a function of the magnetic field B as E=mc 2 ( mc 2 =ððeℏ=mcÞBÞ, which translates into B=B 0 ( 1 where B 0 is the critical magnetic field, B 0 ¼ m 2 c 2 =eℏ ¼ 4:414 Â 10 9 T. The equivalent electric field is E 0 ¼ m 2 c 3 =eℏ ¼ 1:32 Â 10 16 V=cm. As also remarked by Schwinger, with a normally obtainable field of up to 1 T, classical theory is adequate up to energies of 10 15 eV, even nowadays an extreme energy.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigations of synchrotron radiation at the onset of the quantum regime

et al. 2012

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The classical description of synchrotron radiation fails at large Lorentz factors, , for relativistic electrons crossing strong transverse magnetic fields B. In the rest frame of the electron this field is comparable to the so-called critical field B 0 ¼ 4:414 Â 10 9 T. For ¼ B=B 0 ' 1 quantum corrections are essential for the description of synchrotron radiation to conserve energy. With electrons of energies 10-150 GeV penetrating a germanium single crystal along the h110i axis, we have experimentally investigated the transition from the regime where classical synchrotron radiation is an adequate description, to the regime where the emission drastically changes character; not only in magnitude, but also in spectral shape. The spectrum can only be described by quantum synchrotron radiation formulas. Apart from being a test of strong-field quantum electrodynamics, the experimental results are also relevant for the design of future linear colliders where beamstrahlung-a closely related process-may limit the achievable luminosity.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigations of synchrotron radiation at the onset of the quantum regime

et al. 2012

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“…A recent measurement of trident events from both amorphous and crystalline matter may be found in [18]. In fact, energetic particles interacting with an oncoming crystal (as seen from the frame of the particle) closely resembles the situation of particles interacting with an oncoming bunch.…”

Section: Tridentsmentioning

confidence: 98%

Strong field processes in beam-beam interactions at the Compact Linear Collider

Esberg

Uggerhøj

Dalena

et al. 2014

Phys. Rev. ST Accel. Beams

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The demand for high luminosity in the next generation of linear e þ e − colliders necessitates extremely dense beams, giving rise to strong fields at the collision point, and therefore the impact of the field on the physical processes occurring at the interaction point must be considered. These processes are well described by the interaction of the individual lepton with the field of the oncoming bunch, and they depend strongly on the beamstrahlung parameter ϒ which expresses the field experienced by the lepton in units of the critical field. In this paper, we describe calculations and simulations of strong field processes-also of higher order-at the interaction point.

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“…This is well-studied both experimentally [2][3][4][5][6][7][8][9][10] and theoretically [5,[11][12][13][14]. Crystal channeling represents one of the only phenomena where the Schwinger field can be experimentally achieved in the electron's rest frame [6,[15][16][17], with the only other example being the famous E-144 SLAC experiment on non lienar Compton scattering [18] using relativistic electrons colliding with a laser beam. Crystals with ultra relativistic electrons or positrons therefore present a unique possibility to study physics in such strong fields.…”

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confidence: 99%

“…This phenomenon is also discussed in pair production of electron/positron pairs from high energy photons in a strong field where one also distinguishes between the two-step and the one-step, or 'trident' process. This has been investigated in crystals in [16] and has received renewed interest with the prospect of studying such phenomena in high-intensity laser fields [29][30][31][32][33][34]. In this paper we make quantitative calculations of the angularly integrated probability, differential in photon energies, of emission of two photons by an electron in the planar Doyle-Turner potential [24,[35][36][37].…”

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confidence: 99%

Investigation of two-photon emission in strong field QED using channeling in a crystal

Wistisen

2019

Phys. Rev. D

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We investigate the 2nd order process of two photons being emitted by a high-energy electron dressed in the strong background electric field found between the planes in a crystal. The strong crystalline field combined with ultra relativistic electrons is one of very few cases where the Schwinger field can be experimentally achieved in the electron's rest frame. The radiation being emitted, the so-called channeling radiation, is a well studied phenomenon. However only the first order diagram corresponding to emission of a single photon has been studied so far. We elaborate on how the 2 photon emission process should be understood in terms of a two-step versus a one-step process, i.e., if one can consider one photon being emitted after the other, or if there is also a contribution where the two photons are emitted 'simultaneously'. From the calculated full probability we see that the two-step contribution is simply the product of probabilities for single photon emission while the additional one-step terms are, mainly, interferences due to several possible intermediate virtual states. These terms can contribute significantly when the crystal is thin. Therefore, in addition, we see how one can, for a thick crystal, calculate multiple photon emissions quickly by neglecting the one-step terms, which represents a solution of the problem of quantum radiation reaction in a crystal beyond the usually applied constant field approximation. We explicitly calculate an example of 180 GeV electrons in a thin Silicon crystal and argue why it is, for experimental reasons, more feasible to see the one-step contribution in a crystal experiment than in a laser experiment.

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Experimental investigation of strong field trident production

Cited by 12 publications

References 35 publications

Experimental investigations of synchrotron radiation at the onset of the quantum regime

Experimental investigations of synchrotron radiation at the onset of the quantum regime

Strong field processes in beam-beam interactions at the Compact Linear Collider

Investigation of two-photon emission in strong field QED using channeling in a crystal

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