SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

Investigating Transverse and Longitudinal Oscillations in Particle Beams

nishi avatar
nishi
12 diapositives · 239 Views · Jul 17, 2014

This study explores the impact of longitudinal oscillations on transverse plane behavior in a particle accelerator. Observations reveal transient effects after injection, potential chromaticity issues, and non-linear chromaticity measurements. The text discusses longitudinal parameters, non-linear effects on beam motion, and dipolar oscillations at 450 GeV, emphasizing the need for accurate tuning and phase control. Recommendations include re-measuring chromaticity and investigating correlations between oscillations.

#investigating transverse and longitudinal oscillations in particle beams #investigating transverse and longitudinal oscillations in particle beams ppt #powerpoint #presentation
Investigating Transverse and Longitudinal Oscillations in Particle Beams - slide 1
01 / 12Investigating Transverse and Longitudinal Oscillations in Particle Beams
1 / 17

Télécharger la présentation

Investigating Transverse and Longitudinal Oscillations in Particle Beams
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. Possible impact of longitudinal oscillations on transverse plane W. Hofle Acknowledgements: S. Redaelli, E. Chapochnikova, T. Bohl, J. Wenninger, G. Arduini W. Hofle @ LBOC 31.05.2011

  2. Observations transients at injection and longitudinal oscillations present for minutes after injection  see MD results (P. Baudrenghien et al.) occasionally some bunches blow-up transversely  looks rather like single bunch effect chromaticity setting known to be very critical with high number of bunches Question: • can spread of chromaticity over time, between bunches and • even within a single bunch explain the transverse blow-up ? W. Hofle @ LBOC 31.05.2011

  3. Longitudinal parameters at 450 GeV General parameters (450 GeV): beam at injection: LHC voltage not really matched with higher voltage this year with respect to incoming bunch  numbers to be checked W. Hofle @ LBOC 31.05.2011

  4. Non-linear chromaticity in 2010 measurements done 02.03.2010, 25.03.2010, 05.05.2010, not measured in 2011 (?) bunch horizontal beam 1 02.03.2010 center moves due to energy oscillations + tides + … S. Redaelli, 2.3.2010 • some changes since March 2010, I understand, in the way • field errors are compensated, need to re-measure these curves W. Hofle @ LBOC 31.05.2011

  5. tune versus momentum, details Parabolic (quadratic) looks more linear quadratic parabolic model only correct for this case in vicinity of Q’=0 higher terms needed (for good fit) positive Q’ negative Q’ W. Hofle @ LBOC 31.05.2011

  6. Longitudinal dipolar oscillations @450 GeV : +/- 10 degrees phase oscillation corresponds to +/- 0.76x10-4in momentum excursion excursions small compared to bucket height but could bring part of bunch in regions of non constant Q’ W. Hofle @ LBOC 31.05.2011

  7. (if) quadratic dependence of tune on momentum 10 degrees phase oscillation leads to momentum excursion resulting in Q’ modulation of +/- 0.22 units “back-of –the-envelop” curve need new measurement bunch with 10 degrees phase oscillation today machine is operated with a set-point Q’=1 for mean of bunch but bunch covers: 3-4 units of chromaticity if chromaticity really as non-linear as in 2010 W. Hofle @ LBOC 31.05.2011

  8. example: horizontal beam 1 injection (last batch) Q9LH.B1 +/- 0.07 mm @ D=1.1 m  dp/p = +/- 0.064e-3 +/- 8.4 degrees Q’ = +/- 0.18 fill 1806 912 bunches first bunch of a train injected, data logged, need automatic tool to analyse W. Hofle @ LBOC 31.05.2011

  9. example: horizontal beam 2 injection (last batch) Q9RH.B2 +/- 0.18 mm @ D=0.9 m  dp/p = +/- 0.2e-3 +/- 26.3 degrees first bunch of a train injected, data logged, need automatic tool to analyse fill 1806 912 bunches W. Hofle @ LBOC 31.05.2011

  10. A look at fills 1802, 1803 and 1815 (1)  transverse injection oscillations well damped damping times of less than 20 turns for first bunch of trains [offset -1 mm, 0 mm, 1 mm added to display curves separately] W. Hofle @ LBOC 31.05.2011

  11. A look at fills 1802, 1803 and 1815 (2) #1802 #1803 #1815 more longitudinal activity for fill #1803 (bad fill), significant correlation ? [offset added, -0.5 mm, 0 mm, 0.5 mm to display curves separately] W. Hofle @ LBOC 31.05.2011

  12. Recommendation re-measure non-linear part of chromaticity check if correlation between transverse blow-up and longitudinal oscillations also re-visit compensation of tides (?) damper data from first bunch of every train available in logging, but only for 8192 turns after injection  to be looked at, improve logging ? if chromaticity cannot be made flat  theory of stability needs to take this into account check how procedure of compensating tides moves operating point in non-linear part of Q vs momentum curve (same for tune and chromaticity adjustments) W. Hofle @ LBOC 31.05.2011