dorsal/arxiv
View SchemaSummary of experimental studies at CERN on a positron source using crystal effects
| Authors | X. Artru, V. Baier, K. Beloborodov, A. Bogdanov, A. Bukin, S. Burdin, R. Chehab, M. Chevallier, R. Cizeron, D. Dauvergne, T. Dimova, V. Druzhinin, M. Dubrovin, L. Gatignon, V. Goluev, A. Jejcic, P. Keppker, R. Kirsch, V. Kulibaba, P. Lautesse, J. Major, J. -C. Poizat, A. Potylitsin, J. Remillieux, S. Serednyakov, V. Shary, V. Strakhovenko, C. Sylvia |
|---|---|
| Categories | |
| ArXiv ID | physics/0506016 |
| URL | https://arxiv.org/abs/physics/0506016 |
| DOI | 10.1016/j.nimb.2005.04.134 |
| Journal | Nucl.Instrum.Meth. B240 (2005) 762-776 |
Abstract
New kind of positron sources for future linear colliders, where the converter is a tungsten crystal oriented on the <111> axis, has been studied at CERN in the WA103 experiment. In such sources the photons which create the $e^+ e^-$ pairs result from channeling radiation and coherent bremsstrahlung. In this experiment electron beams of 6 and 10 GeV were sent on different kinds of targets: a 4 mm thick crystal, a 8 mm thick crystal and a compound taraget (4 mm crystal + 4 mm amorphous disk). An amorphous tungsten target 20 mm thick was also used for comparison with the 8 mm crystal. Tracks of outgoing charged particles were detected and analyzed by a drift chamber in a magnetic field. The energy and angle spectra of the positrons were obtained for energies up to 150 MeV and angles up to 30 degrees. The measured positron distribution in momentum space (longitudinal versus transverse) is also presented, giving a full momentum space description of the source. Results on outgoing photons are also presented. A significant enhancement of both photon and positron production is clearly observed. At 10 GeV incident energy, the positron enhancement factor is 4 for the 4 mm crystal, about 2 for the 8 mm crystal. Besides, the simulation code for the crystal processes is validated by a quite good agreement between the simulated and experimental spectra, both for positrons and photons.
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"abstract": "New kind of positron sources for future linear colliders, where the converter\nis a tungsten crystal oriented on the \u003c111\u003e axis, has been studied at CERN in\nthe WA103 experiment. In such sources the photons which create the $e^+ e^-$\npairs result from channeling radiation and coherent bremsstrahlung. In this\nexperiment electron beams of 6 and 10 GeV were sent on different kinds of\ntargets: a 4 mm thick crystal, a 8 mm thick crystal and a compound taraget (4\nmm crystal + 4 mm amorphous disk). An amorphous tungsten target 20 mm thick was\nalso used for comparison with the 8 mm crystal. Tracks of outgoing charged\nparticles were detected and analyzed by a drift chamber in a magnetic field.\nThe energy and angle spectra of the positrons were obtained for energies up to\n150 MeV and angles up to 30 degrees. The measured positron distribution in\nmomentum space (longitudinal versus transverse) is also presented, giving a\nfull momentum space description of the source. Results on outgoing photons are\nalso presented. A significant enhancement of both photon and positron\nproduction is clearly observed. At 10 GeV incident energy, the positron\nenhancement factor is 4 for the 4 mm crystal, about 2 for the 8 mm crystal.\nBesides, the simulation code for the crystal processes is validated by a quite\ngood agreement between the simulated and experimental spectra, both for\npositrons and photons.",
"arxiv_id": "physics/0506016",
"authors": [
"X. Artru",
"V. Baier",
"K. Beloborodov",
"A. Bogdanov",
"A. Bukin",
"S. Burdin",
"R. Chehab",
"M. Chevallier",
"R. Cizeron",
"D. Dauvergne",
"T. Dimova",
"V. Druzhinin",
"M. Dubrovin",
"L. Gatignon",
"V. Goluev",
"A. Jejcic",
"P. Keppker",
"R. Kirsch",
"V. Kulibaba",
"P. Lautesse",
"J. Major",
"J. -C. Poizat",
"A. Potylitsin",
"J. Remillieux",
"S. Serednyakov",
"V. Shary",
"V. Strakhovenko",
"C. Sylvia"
],
"categories": [
"physics.ins-det",
"hep-ex"
],
"doi": "10.1016/j.nimb.2005.04.134",
"journal_ref": "Nucl.Instrum.Meth. B240 (2005) 762-776",
"title": "Summary of experimental studies at CERN on a positron source using crystal effects",
"url": "https://arxiv.org/abs/physics/0506016"
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