Undulator-based production of polarized positrons

被引：20

作者：

Alexander, G. ^{[10
]}

Barley, J. ^{[6
]}

Batygin, Y. ^{[8
]}

Berridge, S. ^{[7
]}

Bharadwaj, V. ^{[8
]}

Bower, G. ^{[8
]}

Bugg, W. ^{[7
]}

Decker, F-J. ^{[8
]}

Dollan, R. ^{[3
]}

Efremenko, Y. ^{[7
]}

Floettmann, K. ^{[5
]}

Gharibyan, V. ^{[5
,11
]}

Hast, C. ^{[8
]}

Iverson, R. ^{[8
]}

Kolanoski, H. ^{[3
]}

Kovermann, J. W.

Laihem, K. ^{[1
]}

Lohse, T. ^{[3
]}

McDonald, K. T. ^{[9
]}

Mikhailichenko, A. A. ^{[6
]}

Moortgat-Pick, G. A. ^{[4
]}

Pahl, P. ^{[5
]}

Pitthan, R. ^{[8
]}

Poeschl, R. ^{[5
]}

Reinherz-Aronis, E. ^{[10
]}

Riemann, S. ^{[1
]}

Schaelicke, A. ^{[1
]}

Schueler, K. P. ^{[5
]}

Schweizer, T. ^{[3
]}

Scott, D.

Sheppard, J. C. ^{[8
]}

Stahl, A. ^{[2
]}

Szalata, Z. ^{[8
]}

Walz, D. R. ^{[8
]}

Weidemann, A. ^{[8
]}

机构：

[1] DESY, D-15738 Zeuthen, Germany

[2] Rhein Westfal TH Aachen, D-52056 Aachen, Germany

[3] Humboldt Univ, D-12489 Berlin, Germany

[4] Univ Durham, Durham DH1 3LE, England

[5] DESY, D-22607 Hamburg, Germany

[6] Cornell Univ, Ithaca, NY 14853 USA

[7] Univ Tennessee, Knoxville, TN 37996 USA

[8] SLAC, Menlo Pk, CA 94025 USA

[9] Princeton Univ, Princeton, NJ 08544 USA

[10] Tel Aviv Univ, IL-69978 Tel Aviv, Israel

[11] YerPhl, Yerevan 375036, Armenia

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2009年 / 610卷 / 02期

关键词：

Undulator; Positron; Polarization; CIRCULAR POLARIZATION; LONGITUDINAL POLARIZATION; LINEAR COLLIDERS; MUON DECAY; GAMMA-RAYS; BREMSSTRAHLUNG; ELECTRON; TRANSMISSION; PARTICLES; HELICITY;

D O I：

10.1016/j.nima.2009.07.091

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Full exploitation of the physics potential of a future International Linear Collider will require the use of polarized electron and positron beams. Experiment E166 at the Stanford Linear Accelerator Center (SLAC) has demonstrated a scheme in which an electron beam passes through a helical undulator to generate photons (whose first-harmonic spectrum extended to 7.9MeV) with circular polarization, which are then converted in a thin target to generate longitudinally polarized positrons and electrons. The experiment was carried out with a 1-m-long, 400-period, pulsed helical undulator in the Final Focus Test Beam (FFTB) operated at 46.6 GeV. Measurements of the positron polarization have been performed at five positron energies from 4.5 to 7.5 MeV. In addition, the electron polarization has been determined at 6.7 MeV, and the effect of operating the undulator with a ferrofluid was also investigated. To compare the measurements with expectations, detailed simulations were made with an upgraded version of GEANT4 that includes the dominant polarization-dependent interactions of electrons, positrons. and photons with matter. The measurements agree with calculations, corresponding to 80% polarization for positrons near 6 MeV and 90% for electrons near 7 MeV. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：451 / 487

页数：37

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