Comparison of theory with experiment for positron production from high-energy electrons moving along crystal axes

Baier, V.N.; Strakhovenko, V. M.

doi:10.1103/physrevstab.5.121001

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…In both cases, the incident electron beam of different energies, up to 10 GeV, was aligned with the < 111 >-axis of a tungsten crystal, which sometimes served as a crystal part of the compound target containing an additional amorphous tungsten part. Basing on the approach developed in [4] and [5], theoretical estimations were obtained in [11], which display a rather good agreement with the experimental results of [10], where only the positrons outgoing in the forward direction (i.e., with a vanishing transverse momentum) were registered for a discrete set of their longitudinal momentum values. However, to obtain a full description of the crystal-assisted positron source, the positron distribution in the whole momentum space, longitudinal and transverse, should be measured.…”

Section: Introductionsupporting

confidence: 63%

Summary of experimental studies, at CERN, on a positron source using crystal effects

Artru

Baier

Beloborodov

et al. 2005

Nuclear Instruments and Methods in Physics Research Section B:

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A new kind of positron sources for future linear colliders, where the converter is an aligned tungsten crystal, oriented on the 111 axis, has been studied at CERN in the WA103 experiment with tertiary electron beams from the SPS. In such sources the photons resulting from channeling radiation and coherent bremsstrahlung create the e + e − pairs. Electron beams, of 6 and 10 GeV, were impinging on different kinds of targets: a 4 mm thick crystal, a 8 mm thick crystal and a compound target made of 4 mm crystal followed by 4 mm amorphous disk. An amorphous tungsten target 20 mm thick was also used for the sake of comparison with the 8 mm crystal and to check the ability of the detection system to provide the correct track reconstruction. The charged particles coming out from the target were detected in a drift chamber immersed partially in a magnetic field. The reconstruction of the particle trajectories provided the energy and angular spectrum of the positrons in a rather wide energy range (up to 150 MeV) and angular domain (up to 30 degrees). The experimental

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Section: Introductionsupporting

confidence: 63%

Summary of experimental studies, at CERN, on a positron source using crystal effects

Artru

Baier

Beloborodov

et al. 2005

Nuclear Instruments and Methods in Physics Research Section B:

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show abstract

“…Intensive theoretical investigations [3][4][5][6] have indicated that the optimum thickness is less for the crystal target and that the energy deposition in the crystal target is considerably reduced compared with that of a conventional target. Also, they have shown that the crystal effect is much larger at higher incident electron energies.…”

Section: Introductionmentioning

confidence: 99%

First application of a tungsten single-crystal positron source at the KEK B factory

Suwada

Satoh

Furukawa

et al. 2007

Phys. Rev. ST Accel. Beams

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A new tungsten single-crystal target has been successfully employed at the positron source of the KEKB injector linac. The crystal thickness was determined to be 10.5 mm based on previous systematic measurements of the positron-production efficiency. The crystal axis, h111i, was precisely aligned to the direction of the 4-GeV primary electron beam. The positron yield increased by 25% compared to that for a conventional tungsten plate with a thickness of 14 mm. On the contrary, the steady-state heat load on the crystal target decreased by 20%. After a two-month operation, no degradation of the positronproduction efficiency was observed, and the crystal target has been stably operating at the KEK B factory.

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“…Intensive theoretical investigations [2,3] have indicated that the optimum thickness is less for the crystal target and that the energy deposition in the crystal target is considerably reduced compared with that of a conventional target. Also, they have shown that the crystal effect is much larger at higher incident electron energies.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the positron intensity by a tungsten single-crystal target at the KEKB injector linac

Suwada

Satoh

Sugimura

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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A new tungsten single-crystal target has been successfully employed at the positron source of the KEKB injector linac. The crystal thickness was determined to be 10.5 mm based on the previous systematic measurements of the positron-production efficiency. The crystal axis, <111>, was precisely aligned to the direction of the 4-GeV primary electron beam. The positron yield increased by ~25% compared to that for a conventional tungsten plate with a thickness of 14 mm. On the contrary, the heat load on the crystal target decreased by ~20%. No degradation of the positronproduction efficiency was observed since the crystal target was installed in September 2006, and it has been stably operating at the KEK B-factory.

show abstract

Comparison of theory with experiment for positron production from high-energy electrons moving along crystal axes

Cited by 6 publications

References 12 publications

Summary of experimental studies, at CERN, on a positron source using crystal effects

Summary of experimental studies, at CERN, on a positron source using crystal effects

First application of a tungsten single-crystal positron source at the KEK B factory

Enhancement of the positron intensity by a tungsten single-crystal target at the KEKB injector linac

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