Comparison of the electron and positron anomalous magnetic moments: Experiment 1987

Vasserman, I.B.; Vorobyov, P.V.; Gluskin, E.; Ivanov, P.M.; Koop, I. A.; Kezerashvili, G.Ya.; Лысенко, А. П.; Nesterenko, I.N.; Perevedentsev, E.A.; Mikhailichenko, A.; Polunin, A.A.; Serednyakov, S. I.; Skrinsky, A.N.; Shatunov, Yu. M.

doi:10.1016/0370-2693(87)91515-2

Cited by 24 publications

(11 citation statements)

References 5 publications

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“…In a bunched beam, such oscillations increase the path length around the ring, thereby increasing γ. Sextupole fields open the possibility to move the orbit for such oscillating particles to smaller radii in the storage ring arcs, thus compensating the path length increase. Previous work with electron rings [14] has found increased polarization lifetimes associated with small or zero chromaticities, a property also dependent on the sextupole fields. The chromaticities, ξ x and ξ y , are the derivatives of the betatron tunes, Q x and Q y , with respect to a change in the momentum, ∆p/p, where the tunes are the number of oscillations the beam particles make in the transverse x and y directions in a single turn of the beam around the ring.…”

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confidence: 99%

How to Reach a Thousand-Second in-Plane Polarization Lifetime with0.97−GeV/cDeuterons in a Storage Ring

Guidoboni¹,

Stephenson²,

Andrianov³

et al. 2016

Phys. Rev. Lett.

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confidence: 99%

How to Reach a Thousand-Second in-Plane Polarization Lifetime with0.97−GeV/cDeuterons in a Storage Ring

Guidoboni¹,

Stephenson²,

Andrianov³

et al. 2016

Phys. Rev. Lett.

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“…Therefore, after injection to VEPP-2000 the direction of the positron spin does not change due to radiation polarization, in contrast to electrons. Since the electron and positron beams circulate in the same vacuum chamber in the same magnetic field and in the absence of transverse electric fields, the results of depolarization for them are identical [16].…”

Section: Comparison Of Cbs Measurements With the Rd Methodsmentioning

confidence: 99%

“…The relation (16) is violated in the presence of longitudinal magnetic fields. Therefore, to measure the energy of the VEPP-2000 by RD the collider focusing solenoids and solenoid of CMD-3 detector are swiched off.…”

Section: Comparison Of Cbs Measurements With the Rd Methodsmentioning

confidence: 99%

A system of beam energy measurement based on the Compton backscattered laser photons for the VEPP-2000 electron–positron collider

Abakumova

Ачасов

Berkaev

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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The beam energy measurement system for the VEPP-2000 electron-positron collider is described. The method of Compton backscattering of CO laser photons on the electron beam is used. The relative systematic uncertainty of the beam energy determination is estimated as 6 · 10 −5 . It was obtained through comparison of the results of the beam energy measurements using the Compton backscattering and resonance depolarization methods.

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“…5. It has been noted that the longest horizontal polarization lifetimes for electrons occur when the chromaticity of the storage ring is adjusted to be zero [6], which also requires the use of sextupole magnets. Fig.…”

Section: Lengthening the Horizontal Polarization Lifetimementioning

confidence: 99%

Deuteron polarimeter developments for a storage ring electric dipole moment search

Stephenson¹

2016

Proceedings of XVIth International Workshop in Polarized Sources, Targets, and Polarimetry — PoS(PSTP2015)

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This talk will summarize progress made at the Forschungszentrum Jülich COSY ring on deuteron beam polarimetry for a storage ring search for an electric dipole moment (EDM). Tests have demonstrated the feasibility of using thick carbon targets for highly efficient and continuous observation of the stored beam polarization. After calibration of the sensitivity to geometric misalignments and pileup contributions to the trigger rates, it is possible to correct cross-ratio polarization measurements in real time to levels below one part in 10 5 . By marking each event with the clock time, the horizontal plane precession of the polarization in the ring magnets may be unfolded, yielding access to the magnitude of the horizontal polarization as a function of time. Accurate values require attention to biases from searches for the correct precession rate and false enhancements to the magnitude at low polarizations. This technique facilitates studies of various means to extend the unstable horizontal plane polarization lifetime using bunching, electron cooling, sextupole correction fields, and beam current management with the result that polarization lifetimes now exceed hundreds of seconds. Future plans include feedback to control the polarization precession rate and phase (in preparation for maintaining the polarization parallel to the velocity in a future EDM ring), database measurements to enable better polarimeter engineering, and the extension of these studies to protons.

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Comparison of the electron and positron anomalous magnetic moments: Experiment 1987

Cited by 24 publications

References 5 publications

How to Reach a Thousand-Second in-Plane Polarization Lifetime with0.97−GeV/cDeuterons in a Storage Ring

How to Reach a Thousand-Second in-Plane Polarization Lifetime with0.97−GeV/cDeuterons in a Storage Ring

A system of beam energy measurement based on the Compton backscattered laser photons for the VEPP-2000 electron–positron collider

Deuteron polarimeter developments for a storage ring electric dipole moment search

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