Experimental study of positron production from a 2.55-mm-thick silicon crystal target using 8-GeV electron beams with high-bunch charges

Abstract

We have investigated quenching phenomena of channeling radiation through positron production from a silicon crystal hit by a single-bunch electron beam with high-bunch charge at the 8-GeV electron/positron injector linac. The crystal axis, 〈1 1 0〉, was aligned to the electron beam with a precise goniometer, and positrons produced in the forward direction with a momentum of 20 MeV/c were detected with a magnetic spectrometer. Positron yields were measured by varying the charge in a bunch with a typical bunch length of ∼10 ps from 0.1 nC to 2 nC. The corresponding instantaneous current density ranged from 0.15 × 10⁴ to 1.2 × 10⁴ A/cm². The results show that, at these current densities, the positron yield is proportional to the bunch charge within the experimental accuracy, which implies that no non-linear phenomena are observed in channeling radiation.

Original language	English
Pages (from-to)	142-147
Number of pages	6
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	252
Issue number	1
DOIs	https://doi.org/10.1016/j.nimb.2006.04.065
Publication status	Published - 1 Nov 2006

Keywords

Channeling radiation
Coherent bremsstrahlung
Crystal target
Positron source
Solid-state plasma

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

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10.1016/j.nimb.2006.04.065

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Suwada, T., Furukawa, K., Kamitani, T., Satoh, M., Sugimura, T., Umemori, K., Okuno, H., Hamatsu, R., Yoshida, K., Potylitsyn, A. P., Tropin, I. S., & Chehab, R. (2006). Experimental study of positron production from a 2.55-mm-thick silicon crystal target using 8-GeV electron beams with high-bunch charges. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 252(1), 142-147. https://doi.org/10.1016/j.nimb.2006.04.065

Experimental study of positron production from a 2.55-mm-thick silicon crystal target using 8-GeV electron beams with high-bunch charges. / Suwada, T.; Furukawa, K.; Kamitani, T.; Satoh, M.; Sugimura, T.; Umemori, K.; Okuno, H.; Hamatsu, R.; Yoshida, K.; Potylitsyn, A. P.; Tropin, I. S.; Chehab, R.

In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 252, No. 1, 01.11.2006, p. 142-147.

Research output: Contribution to journal › Article › peer-review

Suwada, T, Furukawa, K, Kamitani, T, Satoh, M, Sugimura, T, Umemori, K, Okuno, H, Hamatsu, R, Yoshida, K, Potylitsyn, AP, Tropin, IS & Chehab, R 2006, 'Experimental study of positron production from a 2.55-mm-thick silicon crystal target using 8-GeV electron beams with high-bunch charges', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 252, no. 1, pp. 142-147. https://doi.org/10.1016/j.nimb.2006.04.065

Suwada T, Furukawa K, Kamitani T, Satoh M, Sugimura T, Umemori K et al. Experimental study of positron production from a 2.55-mm-thick silicon crystal target using 8-GeV electron beams with high-bunch charges. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 2006 Nov 1;252(1):142-147. https://doi.org/10.1016/j.nimb.2006.04.065

Suwada, T. ; Furukawa, K. ; Kamitani, T. ; Satoh, M. ; Sugimura, T. ; Umemori, K. ; Okuno, H. ; Hamatsu, R. ; Yoshida, K. ; Potylitsyn, A. P. ; Tropin, I. S. ; Chehab, R. / Experimental study of positron production from a 2.55-mm-thick silicon crystal target using 8-GeV electron beams with high-bunch charges. In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 2006 ; Vol. 252, No. 1. pp. 142-147.

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abstract = "We have investigated quenching phenomena of channeling radiation through positron production from a silicon crystal hit by a single-bunch electron beam with high-bunch charge at the 8-GeV electron/positron injector linac. The crystal axis, 〈1 1 0〉, was aligned to the electron beam with a precise goniometer, and positrons produced in the forward direction with a momentum of 20 MeV/c were detected with a magnetic spectrometer. Positron yields were measured by varying the charge in a bunch with a typical bunch length of ∼10 ps from 0.1 nC to 2 nC. The corresponding instantaneous current density ranged from 0.15 × 104 to 1.2 × 104 A/cm2. The results show that, at these current densities, the positron yield is proportional to the bunch charge within the experimental accuracy, which implies that no non-linear phenomena are observed in channeling radiation.",

keywords = "Channeling radiation, Coherent bremsstrahlung, Crystal target, Positron source, Solid-state plasma",

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AU - Yoshida, K.

AU - Potylitsyn, A. P.

AU - Tropin, I. S.

AU - Chehab, R.

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N2 - We have investigated quenching phenomena of channeling radiation through positron production from a silicon crystal hit by a single-bunch electron beam with high-bunch charge at the 8-GeV electron/positron injector linac. The crystal axis, 〈1 1 0〉, was aligned to the electron beam with a precise goniometer, and positrons produced in the forward direction with a momentum of 20 MeV/c were detected with a magnetic spectrometer. Positron yields were measured by varying the charge in a bunch with a typical bunch length of ∼10 ps from 0.1 nC to 2 nC. The corresponding instantaneous current density ranged from 0.15 × 104 to 1.2 × 104 A/cm2. The results show that, at these current densities, the positron yield is proportional to the bunch charge within the experimental accuracy, which implies that no non-linear phenomena are observed in channeling radiation.

AB - We have investigated quenching phenomena of channeling radiation through positron production from a silicon crystal hit by a single-bunch electron beam with high-bunch charge at the 8-GeV electron/positron injector linac. The crystal axis, 〈1 1 0〉, was aligned to the electron beam with a precise goniometer, and positrons produced in the forward direction with a momentum of 20 MeV/c were detected with a magnetic spectrometer. Positron yields were measured by varying the charge in a bunch with a typical bunch length of ∼10 ps from 0.1 nC to 2 nC. The corresponding instantaneous current density ranged from 0.15 × 104 to 1.2 × 104 A/cm2. The results show that, at these current densities, the positron yield is proportional to the bunch charge within the experimental accuracy, which implies that no non-linear phenomena are observed in channeling radiation.

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KW - Coherent bremsstrahlung

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KW - Positron source

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