Beams Document 3268-v1

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Creating and Accelerating Flat Bunches in the LHC

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Chandrashekhara M. Bhat
Updated by:
Chandrashekhara M. Bhat
Document Created:
15 Dec 2008, 10:13
Contents Revised:
15 Dec 2008, 10:13
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15 Dec 2008, 10:13
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15 Dec 2008, 10:47
Using large Piwinski-angle scenario for the luminosity upgrade of the LHC collider is one of the most promising technique. It has been suggested that by replacing the bunches with Gaussian line-charge distributions by flat distributions, the luminosity can be increased up to 40%. Here, we present the preliminary results from recent beam dynamics simulations and from beam studies in LHC upstream machines to create flat bunches using double harmonic rf systems. We used the h=1 and h=4 rf systems in the SPS and, h=1 and h=2 rf systems in the PS during our beam studies. The studies were carried out to address flat bunch creation technique and its stability issues. We also have presented simulations and discussions on possible way of creation and acceleration of flat bunches in the LHC for luminosity upgrade.
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