IBIC2016 - List of Keywords (betatron)

Paper	Title	Other Keywords	Page
MOPG47	Beta Function Measurement for the AGS IPM	emittance, dipole, flattop, proton	157
	H. Huang, L. Ahrens, C.E. Harper, F. Méot, V. Schoefer BNL, Upton, Long Island, New York, USA
	Emittance control is important for polarization preservation of proton beam in the Alternative Gradient Synchrotron (AGS). For polarization preservation, two helical dipole partial snake magnets are inserted into the AGS lattice. In addition, the vertical tune has to run very high, in the vicinity of integer. These helical dipole magnets greatly distort the optics, especially near injection. The beta functions along the energy ramp have been modeled and measured at the locations of the Ion Profile Monitor (IPM). For the measurements to be valid, the betatron tune, dipole current and orbit responses have to be carefully measured. This paper summarize the experiment results and comparison with the model. These results will lead to understanding of emittance evolution in the AGS.
	Poster MOPG47 [2.033 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG47
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TUPG49	Review of Chromaticity Measurement Approaches Using Head-Tail Phase Shift Method at RHIC	synchrotron, simulation, emittance, operation	457
	V.H. Ranjbar, A. Marusic, M.G. Minty BNL, Upton, Long Island, New York, USA
	Funding: Work supported the URA., Inc., under contract DE-AC02-76CH03000 with the U.S. Dept. of Energy We review tests of the head-tail phase shift method using various approaches at BNL's RHIC. Both the standard and some more exotic approaches to measure the phase differential between the head and tail of a bunched beam has been attempted at RHIC. The standard kick beam and measured phase evolution of the head and tail of a given bunch has been tried at RHIC. Additionally a more exotic approach to measure the head versus tail phase difference has been tried. In this approach we used a BBQ pickup and kicker with the input stripline signal to the BBQ mixed with a nano second pulse timed to the head and tail of the bunch. In this way we hoped to force the BBQ to sample the head or tail of the bunch depending on the pulse timing. We report on the results and challenges which each approach presented.
	Poster TUPG49 [0.957 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG49
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WEBL04	The New Optical Device for Turn to Turn Beam Profile Measurement	electron, diagnostics, storage-ring, positron	593
	V.L. Dorokhov BINP, Novosibirsk, Russia A.D. Khilchenko, A.I. Kotelnikov, A.N. Kvashnin, O.I. Meshkov, P.V. Zubarev BINP SB RAS, Novosibirsk, Russia V. Korchuganov, A.I. Stirin, A.G. Valentinov NRC, Moscow, Russia
	The electron beam quality determines the main synchrotron radiation characteristics therefore beam diagnostics is of great importance for synchrotron radiation source performance. The real-time processing of the electron beam parameters is a necessary procedure to optimize the key characteristics of the source using feedback loops. The frequency of electron beam cycling in the synchrotron storage ring is about 1 MHz. In multi-bunch mode electrons are grouped into a series of bunches. The bunch repetition frequency depends on the total number of bunches and usually reaches hundreds of MHz. The actual problem is to study the separate bunch dimensions behavior under multi-bunch beam instabilities. To solve this problem a turn-to-turn electron beam profile monitor is developed for Siberia-2 synchrotron light source. The linear avalanche photodiodes array is applied to imaging. The apparatus is able to record a transversal profile of selected bunches and analyze the dynamics of beam during 10⁶ turns. The recent experimental results obtained with the diagnostics are described.
	Slides WEBL04 [4.282 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL04
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WECL03	Measurement of the Beam Response to Quadrupole Kick by Using Stripline Pickup Monitor at J-PARC Main Ring	kicker, quadrupole, resonance, operation	604
	Y. Nakanishi, A. Ichikawa, A. Ichikawa, A. Minamino, K.G. Nakamura, T. Nakaya Kyoto University, Kyoto, Japan T. Koseki, H. Kuboki, M. Okada, T. Toyama KEK, Tokai, Ibaraki, Japan
	Funding: Work supported by MEXT KAKENHI, GA 25105002, Grant-in-Aid for Scientific Research on Innovative Areas titled "Unification and Development of the Neutrino Science Frontier" In high intensity proton synchrotrons, linear and nonlinear betatron resonances cause beam loss. When the betatron tune spreads over a resonance line, the oscillation amplitude will get larger, causing a large beam loss. Our study aims for a direct measurement of the betatron tune spread by using a quadrupole kicker and a 4-electrode monitor. The monochromatic rf signal is inputted to the kicker and we induce an oscillation by kicking the beam. The amplitude of the quadrupole oscillation will depend on the number of particles having a certain tune. In the beam test at J-PARC MR, the dipole kicker was used as a quadrupole kicker by exciting the two facing electrodes in-phase. We measured the response to the kick at several frequencies. We observed that the amplitude depends on the kicker frequency and the number of particles per bunch. This demonstrates that the quadrupole oscillation can be induced by a kicker and the possibility of measuring the number of a particular tune particle from the response. We will present the result of the beam test and our prospect and the comparison between the experimental result and a numerical calculation.
	Slides WECL03 [2.054 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WECL03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOPG47

Beta Function Measurement for the AGS IPM

emittance, dipole, flattop, proton

157

H. Huang, L. Ahrens, C.E. Harper, F. Méot, V. Schoefer
BNL, Upton, Long Island, New York, USA

Emittance control is important for polarization preservation of proton beam in the Alternative Gradient Synchrotron (AGS). For polarization preservation, two helical dipole partial snake magnets are inserted into the AGS lattice. In addition, the vertical tune has to run very high, in the vicinity of integer. These helical dipole magnets greatly distort the optics, especially near injection. The beta functions along the energy ramp have been modeled and measured at the locations of the Ion Profile Monitor (IPM). For the measurements to be valid, the betatron tune, dipole current and orbit responses have to be carefully measured. This paper summarize the experiment results and comparison with the model. These results will lead to understanding of emittance evolution in the AGS.

Poster MOPG47 [2.033 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG47

Export •

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

TUPG49

Review of Chromaticity Measurement Approaches Using Head-Tail Phase Shift Method at RHIC

synchrotron, simulation, emittance, operation

457

V.H. Ranjbar, A. Marusic, M.G. Minty
BNL, Upton, Long Island, New York, USA

Funding: Work supported the URA., Inc., under contract DE-AC02-76CH03000 with the U.S. Dept. of Energy
We review tests of the head-tail phase shift method using various approaches at BNL's RHIC. Both the standard and some more exotic approaches to measure the phase differential between the head and tail of a bunched beam has been attempted at RHIC. The standard kick beam and measured phase evolution of the head and tail of a given bunch has been tried at RHIC. Additionally a more exotic approach to measure the head versus tail phase difference has been tried. In this approach we used a BBQ pickup and kicker with the input stripline signal to the BBQ mixed with a nano second pulse timed to the head and tail of the bunch. In this way we hoped to force the BBQ to sample the head or tail of the bunch depending on the pulse timing. We report on the results and challenges which each approach presented.

Poster TUPG49 [0.957 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG49

Export •

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

WEBL04

The New Optical Device for Turn to Turn Beam Profile Measurement

electron, diagnostics, storage-ring, positron

593

V.L. Dorokhov
BINP, Novosibirsk, Russia
A.D. Khilchenko, A.I. Kotelnikov, A.N. Kvashnin, O.I. Meshkov, P.V. Zubarev
BINP SB RAS, Novosibirsk, Russia
V. Korchuganov, A.I. Stirin, A.G. Valentinov
NRC, Moscow, Russia

The electron beam quality determines the main synchrotron radiation characteristics therefore beam diagnostics is of great importance for synchrotron radiation source performance. The real-time processing of the electron beam parameters is a necessary procedure to optimize the key characteristics of the source using feedback loops. The frequency of electron beam cycling in the synchrotron storage ring is about 1 MHz. In multi-bunch mode electrons are grouped into a series of bunches. The bunch repetition frequency depends on the total number of bunches and usually reaches hundreds of MHz. The actual problem is to study the separate bunch dimensions behavior under multi-bunch beam instabilities. To solve this problem a turn-to-turn electron beam profile monitor is developed for Siberia-2 synchrotron light source. The linear avalanche photodiodes array is applied to imaging. The apparatus is able to record a transversal profile of selected bunches and analyze the dynamics of beam during 10⁶ turns. The recent experimental results obtained with the diagnostics are described.

Slides WEBL04 [4.282 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL04

Export •

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

WECL03

Measurement of the Beam Response to Quadrupole Kick by Using Stripline Pickup Monitor at J-PARC Main Ring

kicker, quadrupole, resonance, operation

604

Y. Nakanishi, A. Ichikawa, A. Ichikawa, A. Minamino, K.G. Nakamura, T. Nakaya
Kyoto University, Kyoto, Japan
T. Koseki, H. Kuboki, M. Okada, T. Toyama
KEK, Tokai, Ibaraki, Japan

Funding: Work supported by MEXT KAKENHI, GA 25105002, Grant-in-Aid for Scientific Research on Innovative Areas titled "Unification and Development of the Neutrino Science Frontier"
In high intensity proton synchrotrons, linear and nonlinear betatron resonances cause beam loss. When the betatron tune spreads over a resonance line, the oscillation amplitude will get larger, causing a large beam loss. Our study aims for a direct measurement of the betatron tune spread by using a quadrupole kicker and a 4-electrode monitor. The monochromatic rf signal is inputted to the kicker and we induce an oscillation by kicking the beam. The amplitude of the quadrupole oscillation will depend on the number of particles having a certain tune. In the beam test at J-PARC MR, the dipole kicker was used as a quadrupole kicker by exciting the two facing electrodes in-phase. We measured the response to the kick at several frequencies. We observed that the amplitude depends on the kicker frequency and the number of particles per bunch. This demonstrates that the quadrupole oscillation can be induced by a kicker and the possibility of measuring the number of a particular tune particle from the response. We will present the result of the beam test and our prospect and the comparison between the experimental result and a numerical calculation.

Slides WECL03 [2.054 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WECL03

Export •

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