eeFACT2016 - List of Keywords (laser)

Paper	Title	Other Keywords	Page
TUT2H2	Injector Linac Upgrade and New RF Gun Development for SuperKEKB	ion, gun, cavity, emittance	74
	T. Natsui, D. Satoh, M. Yoshida, R. Zhang, X. Zhou KEK, Ibaraki, Japan
	The SuperKEKB commissioning has finally started. The final goal of luminosity is 40 times higher than KEKB. The injector upgrade is required to obtain the low emittance and high charge beam corresponding to the short beam life and small injection acceptance of the SuperKEKB ring. In the injector linac, several new instruments have been installed. Flux Concentrator (FC) was developed for high charge positron beam production. The target bunch charge of positron beam is 4 nC. The new damping ring will be used for positron beam to reduce beam emittance to 10 mm-mrad. However, electron beam must be reached to 20 mm-mrad normalized emittance at 5 nC beam charge without damping ring. Thermionic gun was used for KEKB injector and it was able to generate enough beam charge. However, its emittance is too large. Therefor we developed photo cathode S-band RF gun. This new RF gun has unique accelerating cavity which called quasi-travelling wave side coupled cavity. Laser system for this photo cathode has been also developed. The laser system is constructed with Yb:YAG thin disk for high power and pulse shaping. I will illustrate the RF gun, laser system and several new injector linac systems.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT2H2
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WET1H4	Measurement of Beam Polarization and Beam Energy in One Device	ion, electron, polarization, photon	168
	N.Yu. Muchnoi BINP SB RAS, Novosibirsk, Russia
	Funding: Russian Science Foundation N 14-50-00080 Electron beam interaction with the monochromatic laser radiation produces scattered photons and electrons due to the Compton effect. Both types of scattered particles carry the information about the polarisation (if any) and the energy of initial electrons in the beam. This report is focused on the properties of the scattered electrons. After a bending magnet these electrons leave the beam and their X-Y space distribution is supposed to be measured by the 2D pixel detector. We show that if the electron beam vertical emittance is sufficiently small, the shape of this distribution is an ellipse. Measurement of the length of the X-axis of this ellipse allow to calibrate accurately the bending field integral seen by the beam. The distribution of the electrons within the ellipse depends on the initial beam polarisation, allowing to measure its degree and direction. So we propose a universal Compton polarimeter with a unique feature of precise calibration of the LEP-style beam energy spectrometer. The approach is thought to be useful for the future high-energy e⁺/e⁻ colliders, while the feasibility tests need to be performed on existing accelerators.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-WET1H4
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUT2H2

Injector Linac Upgrade and New RF Gun Development for SuperKEKB

ion, gun, cavity, emittance

74

T. Natsui, D. Satoh, M. Yoshida, R. Zhang, X. Zhou
KEK, Ibaraki, Japan

The SuperKEKB commissioning has finally started. The final goal of luminosity is 40 times higher than KEKB. The injector upgrade is required to obtain the low emittance and high charge beam corresponding to the short beam life and small injection acceptance of the SuperKEKB ring. In the injector linac, several new instruments have been installed. Flux Concentrator (FC) was developed for high charge positron beam production. The target bunch charge of positron beam is 4 nC. The new damping ring will be used for positron beam to reduce beam emittance to 10 mm-mrad. However, electron beam must be reached to 20 mm-mrad normalized emittance at 5 nC beam charge without damping ring. Thermionic gun was used for KEKB injector and it was able to generate enough beam charge. However, its emittance is too large. Therefor we developed photo cathode S-band RF gun. This new RF gun has unique accelerating cavity which called quasi-travelling wave side coupled cavity. Laser system for this photo cathode has been also developed. The laser system is constructed with Yb:YAG thin disk for high power and pulse shaping. I will illustrate the RF gun, laser system and several new injector linac systems.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT2H2

Export •

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

WET1H4

Measurement of Beam Polarization and Beam Energy in One Device

ion, electron, polarization, photon

168

N.Yu. Muchnoi
BINP SB RAS, Novosibirsk, Russia

Funding: Russian Science Foundation N 14-50-00080
Electron beam interaction with the monochromatic laser radiation produces scattered photons and electrons due to the Compton effect. Both types of scattered particles carry the information about the polarisation (if any) and the energy of initial electrons in the beam. This report is focused on the properties of the scattered electrons. After a bending magnet these electrons leave the beam and their X-Y space distribution is supposed to be measured by the 2D pixel detector. We show that if the electron beam vertical emittance is sufficiently small, the shape of this distribution is an ellipse. Measurement of the length of the X-axis of this ellipse allow to calibrate accurately the bending field integral seen by the beam. The distribution of the electrons within the ellipse depends on the initial beam polarisation, allowing to measure its degree and direction. So we propose a universal Compton polarimeter with a unique feature of precise calibration of the LEP-style beam energy spectrometer. The approach is thought to be useful for the future high-energy e⁺/e⁻ colliders, while the feasibility tests need to be performed on existing accelerators.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-WET1H4

Export •

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