IPAC2018 - List of Authors (Nikitin, S.A.)

Paper	Title	Page
WEPAL066	Determination of RF Resonator Axis Inclination to Beam Axis in Electron-Positron Storage Ring	2330
SUSPF101	use link to see paper's listing under its alternate paper code
	Leshenok D. Leshenok NSU, Novosibirsk, Russia S.A. Nikitin BINP SB RAS, Novosibirsk, Russia
	We proposed and tested the method that allows obtaining of an upper limit for an angle of the RF resonator axis inclination relative to a beam axis. Such disturbance gives an additional contribution to separation of electron and positron orbits due to action of the transverse component of the electric field. In the horizontal plane, this effect can lead to increase of the difference between electrons and positrons spin precession frequencies in a storage mono-ring collider. This effect can play a great role in FCC. At the angular disturbance of axis in the certain VEPP-4M RF resonators ~10^-3 rad, the difference between the spin frequencies is about 10^-8. Our method is based on resonant excitation of betatron oscillations using phase modulation of the master oscillator of the RF system. The maximal amplitude of the enforced oscillations is measured by the counting rate of the VEPP-4M Touschek polarimeter scintillation counters. Comparison of the obtained results with the data of the special calibration experiment allows estimating the value of the inclination angle. In this calibrated experiment the betatron oscillations excite using the VEPP-4M kicker.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPAL066
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FRXGBD4	Observation of Saw-Tooth Effect Orbit in the VEPP-4 M Collider	5026
	Leshenok D. Leshenok, E.A. Bekhtenev NSU, Novosibirsk, Russia E.A. Bekhtenev, G.V. Karpov, S.A. Nikitin, O.A. Plotnikova BINP SB RAS, Novosibirsk, Russia
	We study the relative position of the electron and posi-tron closed orbits in the VEPP-4M single storage ring collider in experiments on orbit precision monitoring. A difference in the orbits can affect the accuracy of several fundamental experiments, e.g. precise comparison of the electron and positron spin frequencies (the CPT invari-ance test) [1]. In this case, the spin precession frequencies of particles should be compared within at least 5·10^-9. The distinction of frequencies depends on the features of the radial orbits. Ideally, the difference in the electron and positron orbits is set only by distributed radiation losses of particle energy. The corresponding contribution to the total orbit distortions is called the Saw-Tooth effect orbit. Another example of possible precision experiment at VEPP-4M is search for the light speed anisotropy (LSA). In this case, it is necessary to ensure a stability of the difference in the radial orbits of electrons and positrons at a level of 1μm.
	Slides FRXGBD4 [1.602 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-FRXGBD4
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

WEPAL066

Determination of RF Resonator Axis Inclination to Beam Axis in Electron-Positron Storage Ring

2330

SUSPF101

use link to see paper's listing under its alternate paper code

Leshenok D. Leshenok
NSU, Novosibirsk, Russia
S.A. Nikitin
BINP SB RAS, Novosibirsk, Russia

We proposed and tested the method that allows obtaining of an upper limit for an angle of the RF resonator axis inclination relative to a beam axis. Such disturbance gives an additional contribution to separation of electron and positron orbits due to action of the transverse component of the electric field. In the horizontal plane, this effect can lead to increase of the difference between electrons and positrons spin precession frequencies in a storage mono-ring collider. This effect can play a great role in FCC. At the angular disturbance of axis in the certain VEPP-4M RF resonators ~10^-3 rad, the difference between the spin frequencies is about 10^-8. Our method is based on resonant excitation of betatron oscillations using phase modulation of the master oscillator of the RF system. The maximal amplitude of the enforced oscillations is measured by the counting rate of the VEPP-4M Touschek polarimeter scintillation counters. Comparison of the obtained results with the data of the special calibration experiment allows estimating the value of the inclination angle. In this calibrated experiment the betatron oscillations excite using the VEPP-4M kicker.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPAL066

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRXGBD4

Observation of Saw-Tooth Effect Orbit in the VEPP-4 M Collider

5026

Leshenok D. Leshenok, E.A. Bekhtenev
NSU, Novosibirsk, Russia
E.A. Bekhtenev, G.V. Karpov, S.A. Nikitin, O.A. Plotnikova
BINP SB RAS, Novosibirsk, Russia

We study the relative position of the electron and posi-tron closed orbits in the VEPP-4M single storage ring collider in experiments on orbit precision monitoring. A difference in the orbits can affect the accuracy of several fundamental experiments, e.g. precise comparison of the electron and positron spin frequencies (the CPT invari-ance test) [1]. In this case, the spin precession frequencies of particles should be compared within at least 5·10^-9. The distinction of frequencies depends on the features of the radial orbits. Ideally, the difference in the electron and positron orbits is set only by distributed radiation losses of particle energy. The corresponding contribution to the total orbit distortions is called the Saw-Tooth effect orbit. Another example of possible precision experiment at VEPP-4M is search for the light speed anisotropy (LSA). In this case, it is necessary to ensure a stability of the difference in the radial orbits of electrons and positrons at a level of 1μm.

Slides FRXGBD4 [1.602 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-FRXGBD4

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)