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Title: Proposal of An Experiment on Bunch Length Modulation in DAFNE

Abstract

Obtaining very short bunches is an issue especially for colliders but also for CSR sources. The modulation of the bunch length in a strong rf focusing regime had been proposed, corresponding to a high value of the synchrotron tune. A ring structure where the function R56 along the ring oscillates between large positive and negative values will produce bunch length modulation. The synchrotron frequency can be tuned both by the rf power and by the integral of the function R56, up to the limit of zero value corresponding to the isochronicity condition. The proposal of a bunch length modulation along the ring in DA{Phi}NE is here described. DA{Phi}NE lattice can be tuned to positive or negative momentum compaction values, or to structures in which the two arcs are respectively set to positive/negative integrals of the R56 function. With the installation of an extra rf system at 1.3 GHz, experiments on bunch length modulation both in the regime of high and low synchrotron tune can be realized.

Authors:
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Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
878010
Report Number(s):
SLAC-PUB-11656
TRN: US0601787
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Prepared for Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 16-20 May 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; FOCUSING; MODULATION; RF SYSTEMS; SYNCHROTRONS; Accelerators,ACCPHY

Citation Formats

Biscari, C., Alesini, D., Benedetti, G., Biagini, M.E., Boni, R., Boscolo, M., Clozza, A., Delle Monache, G., Di Pirro, G., Drago, A., Gallo, A., Ghigo, A., Guiducci, S., Incurvati, M., Ligi, C., Marcellini, F., Mazzitelli, G., Milardi, C., Pellegrino, L., Preger, M.A., Raimondi, P., and /Frascati /Novosibirsk, IYF /SLAC /LBL, Berkeley /INFN, Milan. Proposal of An Experiment on Bunch Length Modulation in DAFNE. United States: N. p., 2006. Web.
Biscari, C., Alesini, D., Benedetti, G., Biagini, M.E., Boni, R., Boscolo, M., Clozza, A., Delle Monache, G., Di Pirro, G., Drago, A., Gallo, A., Ghigo, A., Guiducci, S., Incurvati, M., Ligi, C., Marcellini, F., Mazzitelli, G., Milardi, C., Pellegrino, L., Preger, M.A., Raimondi, P., & /Frascati /Novosibirsk, IYF /SLAC /LBL, Berkeley /INFN, Milan. Proposal of An Experiment on Bunch Length Modulation in DAFNE. United States.
Biscari, C., Alesini, D., Benedetti, G., Biagini, M.E., Boni, R., Boscolo, M., Clozza, A., Delle Monache, G., Di Pirro, G., Drago, A., Gallo, A., Ghigo, A., Guiducci, S., Incurvati, M., Ligi, C., Marcellini, F., Mazzitelli, G., Milardi, C., Pellegrino, L., Preger, M.A., Raimondi, P., and /Frascati /Novosibirsk, IYF /SLAC /LBL, Berkeley /INFN, Milan. Fri . "Proposal of An Experiment on Bunch Length Modulation in DAFNE". United States. doi:. https://www.osti.gov/servlets/purl/878010.
@article{osti_878010,
title = {Proposal of An Experiment on Bunch Length Modulation in DAFNE},
author = {Biscari, C. and Alesini, D. and Benedetti, G. and Biagini, M.E. and Boni, R. and Boscolo, M. and Clozza, A. and Delle Monache, G. and Di Pirro, G. and Drago, A. and Gallo, A. and Ghigo, A. and Guiducci, S. and Incurvati, M. and Ligi, C. and Marcellini, F. and Mazzitelli, G. and Milardi, C. and Pellegrino, L. and Preger, M.A. and Raimondi, P. and /Frascati /Novosibirsk, IYF /SLAC /LBL, Berkeley /INFN, Milan},
abstractNote = {Obtaining very short bunches is an issue especially for colliders but also for CSR sources. The modulation of the bunch length in a strong rf focusing regime had been proposed, corresponding to a high value of the synchrotron tune. A ring structure where the function R56 along the ring oscillates between large positive and negative values will produce bunch length modulation. The synchrotron frequency can be tuned both by the rf power and by the integral of the function R56, up to the limit of zero value corresponding to the isochronicity condition. The proposal of a bunch length modulation along the ring in DA{Phi}NE is here described. DA{Phi}NE lattice can be tuned to positive or negative momentum compaction values, or to structures in which the two arcs are respectively set to positive/negative integrals of the R56 function. With the installation of an extra rf system at 1.3 GHz, experiments on bunch length modulation both in the regime of high and low synchrotron tune can be realized.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 20 00:00:00 EST 2006},
month = {Fri Jan 20 00:00:00 EST 2006}
}

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  • We propose an accelerator physics experiment in DAFNE to prove the regime of bunch length modulation in storage rings, which has never been tested before in any existing accelerator. The result of the experiment can be of great interest for the future colliders and for the synchrotron light sources. The concept has been developed at the Divisione Acceleratori in the framework of super-factory studies. Collaborations with international groups interested in the experiment have been set-up.
  • A gain limitation for the F.E.L. installed in ACO appears as the charge density decreases in connection with the ''anomalous lengthening'' and the synchrotron movement instabilities which are affecting high current operation of the storage ring. An extra RF system is designed to cure both these effects. The basic component of the system is an extra cavity driven through a power RF amplifier by a signal whose spectrum is composed by the even harmonics of the revolution frequency and the nf /SUB o/ - f /SUB s/ side bands. The proper input is achieved from the signal induced by themore » beam on a radial pick-up electrode by means of a pulsed window amplifier. The amplifier equalizes the two components of the picked-up signal, one due to energy oscillation and the other to phase oscillation and thus realizes the suitable spectrum for the input. A feedback loop ensures the normalization of that signal. Synchrotron movement stabilization and bunch length control are expected to work for stored currents up to 100 mA.« less
  • Bunch length is of prime importance to beam driven plasma wakefield acceleration experiments due to its inverse relationship to the amplitude of the accelerating wake. We present here a summary of work done by the E167 collaboration measuring the SLAC ultra-short bunches via autocorrelation of coherent transition radiation. We have studied material transmission properties and improved our autocorrelation traces using materials with better spectral characteristics.
  • No abstract prepared.