eeFACT2016 - Table of Session: WET1H (Beam Instrumentation and Beam Diagnostics)

Paper	Title	Page
WET1H1	Beam Instrumentation Needs for a Future Electron-Positron Collider Based on PEP-II Observations	157
	J.T. Seeman SLAC, Menlo Park, California, USA
	Funding: Work supported by US DOE/SU Contract DE-AC02-76SF00515. Future e⁺e⁻ colliders will operate with many bunches, short bunch lengths, small emittances, high currents, and small interaction point betas. The stability of the colliding beams with these characteristics will depend on detailed, high precision, and continuous measurements. The various beam measurement requirements and techniques will be discussed using PEP-II observations as a starting point.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-WET1H1
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WET1H2	Beam Position Measurements at Synchrotron Light Sources
	V.V. Smaluk BNL, Upton, Long Island, New York, USA
	Funding: Work supported by DOE under contract No.DE-AC02- 98CH10886 User operations of modern synchrotron light sources require very high stability of the electron beam in the light generating devices (wigglers and undulators), usually at the level of 5-10% of the beam size. The beam stability is provided by use of fast orbit feedback systems, the essential parts of which are beam position monitors (BPMs). Since the beam emittance is very low, the BPMs should provide reliable beam position measurements with sub-micron accuracy. Some aspects of design of modern BPM systems are given, the measured BPM resolution is presented, and some techniques of the resolution improvement are discussed.
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WET1H3	Beam Instrumentation in SuperKEKB	164
	H. Fukuma KEK, Ibaraki, Japan
	SuperKEKB is an upgraded collider of the KEK B-factory (KEKB). Its phase 1 operation has just finished in this June. A BPM system consists of super heterodyne detectors, turn by turn log-ratio detectors with fast gates and detectors for the orbit feedback to maintain stable collision. New X-ray beam profile monitors with multi-slit masks are installed. The bunch-by-bunch feedback system is upgraded using low noise frontend electronics and new 12 bits iGp digital filters. A status of instrumentations of SuperKEKB will be given in this talk.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-WET1H3
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WET1H4	Measurement of Beam Polarization and Beam Energy in One Device	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
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Paper

Title

Page

Beam Instrumentation Needs for a Future Electron-Positron Collider Based on PEP-II Observations

157

J.T. Seeman
SLAC, Menlo Park, California, USA

Funding: Work supported by US DOE/SU Contract DE-AC02-76SF00515.
Future e⁺e⁻ colliders will operate with many bunches, short bunch lengths, small emittances, high currents, and small interaction point betas. The stability of the colliding beams with these characteristics will depend on detailed, high precision, and continuous measurements. The various beam measurement requirements and techniques will be discussed using PEP-II observations as a starting point.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-WET1H1

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

WET1H2

Beam Position Measurements at Synchrotron Light Sources

V.V. Smaluk
BNL, Upton, Long Island, New York, USA

Funding: Work supported by DOE under contract No.DE-AC02- 98CH10886
User operations of modern synchrotron light sources require very high stability of the electron beam in the light generating devices (wigglers and undulators), usually at the level of 5-10% of the beam size. The beam stability is provided by use of fast orbit feedback systems, the essential parts of which are beam position monitors (BPMs). Since the beam emittance is very low, the BPMs should provide reliable beam position measurements with sub-micron accuracy. Some aspects of design of modern BPM systems are given, the measured BPM resolution is presented, and some techniques of the resolution improvement are discussed.

Export •

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

WET1H3

Beam Instrumentation in SuperKEKB

164

H. Fukuma
KEK, Ibaraki, Japan

SuperKEKB is an upgraded collider of the KEK B-factory (KEKB). Its phase 1 operation has just finished in this June. A BPM system consists of super heterodyne detectors, turn by turn log-ratio detectors with fast gates and detectors for the orbit feedback to maintain stable collision. New X-ray beam profile monitors with multi-slit masks are installed. The bunch-by-bunch feedback system is upgraded using low noise frontend electronics and new 12 bits iGp digital filters. A status of instrumentations of SuperKEKB will be given in this talk.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-WET1H3

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

WET1H4

Measurement of Beam Polarization and Beam Energy in One Device

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)