Beam observation and the nature of instabilities

Gareyte, J.

doi:10.1063/1.38074

Cited by 9 publications

(7 citation statements)

References 14 publications

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“…4एRmaeऍ z ! 2Î (2) where Z ? is the transverse impedance, e is the proton charge,Î = N B e=घ p 2एç t ङ is the peak current, ç t is the rms bunch length, R is the mean radius of accelerator, m the mass of proton, ae = 1 =घ1 , ae 2 ङ 1=2 , j 2 = ,1, ऍ z is the vertical betatron tune, and !…”

Section: Discussionmentioning

confidence: 99%

“…The coherent tune shift is a result of the increase in intensity and it is given by [1,2] ࣽऍ z = j eZ ? 4एRmaeऍ z !…”

Section: Discussionmentioning

confidence: 99%

“…Firstly, not all particles in the bunch have the nominal revolution period T 0 due to the momentum spread ࣽp=p. The change in period ࣽT 0 is given by [1,2] ࣽT 0…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Space charge effect on betatron oscillations

Fung

Chu

Hsi

et al. 1999

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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The transverse motion of the beam at the AGS was studied by analyzing the coherent beam signals, digitized at a 10ns interval, at various beam intensities. It was found that the coherent vertical tune shift of the centroid is consistent with the space charge model due to the image charge and current induced on the vacuum chamber wall. An enhanced linear coupling at a high intensity was also observed.

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Section: Discussionmentioning

confidence: 99%

“…The coherent tune shift is a result of the increase in intensity and it is given by [1,2] ࣽऍ z = j eZ ? 4एRmaeऍ z !…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Space charge effect on betatron oscillations

Fung

Chu

Hsi

et al. 1999

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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“…The fast head-tail (HT) is observed in LEP, SPS [51] and other electron machines with short bunches, but not so far in hadron machines with long bunches; because the beam power spectra and its interaction [65] with the impedance differ between these cases. Other stabilizing mechanisms have been suggested.…”

Section: Fast Head-tail Instabilitymentioning

confidence: 99%

Summary of instabilities and damping group

Koscielniak¹

1999

AIP Conference Proceedings

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There are a number of new high intensity proton synchrotrons proposed: the SNS [6] at Oakridge and ESS[7] in Europe, as neutron sources; the JHF/NSP [9] in Japan, a multi-disciplinary facility sponsored by KEK and JAERI; the New FNAL Booster [5]; and the Proton Driver [4,8] as first stage of a µ − µ collider. In addition there are operating machines such as ISIS[1] at RAL, the Brookhaven AGS[3] and its Booster, and the IPNS[35] at Argonne with high intensity and beam power. Moreover, at the energy frontier the beam quality requirements of CERN LHC[10] will pose new and challenging operation modes for its injector chain comprising Booster, PS[12], and SPS [11]. All will encounter beam current limitations arising from beam instability; and the lower energy machines are also limited by space-charge collective effects. Though many anticipated problems are shared in common between these machines, the impetus for the theme of this workshop, "Instabilities of High Intensity Hadron Beams in Rings", comes from the SNS and Proton Driver which were the inspiration for the charge to the "Instabilities Working Group" to answer the following questions.

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“…Even intrabunch momentum oscillations can be observed if the difference signal from a position monitor in a high dispersion region is viewed on this type of display. 30 If the signal from a fast beam current monitor is used to trigger a sample of the machine rf waveform, bunch phase oscillations can be measured without the need for a mountain range display or wideband scope. This circuit is essentially a type of phase detector.…”

Section: Bunch Shape and Time Distribution Measurementsmentioning

confidence: 99%

Longitudinal emittance: An introduction to the concept and survey of measurement techniques including design of a wall current monitor

Webber¹

1990

AIP Conference Proceedings

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The properties of charged particle beams associated with the distribution of the particles in energy and in time can be grouped together under the category of longitudinal emittance. This article is intended to provide an intuitive introduction to the concepts of longitudinal emittance; to provide an incomplete survey of methods used to measure this emittance and the related properties of bunch length and momentum spread; and to describe the detailed design of a 6 Ghz bandwidth resistive wall current monitor useful for measuring bunch shapes of moderate to high intensity beams. Overall, the article is intended to be broad in scope, in most cases deferring details to cited original papers.

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Beam observation and the nature of instabilities

Cited by 9 publications

References 14 publications

Space charge effect on betatron oscillations

Space charge effect on betatron oscillations

Summary of instabilities and damping group

Longitudinal emittance: An introduction to the concept and survey of measurement techniques including design of a wall current monitor

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