Beams Document 2602-v2

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Creation and Storage of Long and Flat Bunches in the LHC

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Milorad B. Popovic
Updated by:
Milorad B. Popovic
Document Created:
09 Jan 2007, 09:05
Contents Revised:
09 Jan 2007, 09:07
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09 Jan 2007, 09:07
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09 Jan 2007, 09:05
To maximize the luminosity of the Large Hadron Collider (LHC), the collision of particle bunches with a uniform longitudinal particle density is considered for a future upgrade. In the first part, three possible options are analyzed with respect to their potential luminosity gain at the beam-beam limit: short rectangular bunches held by multiple RF harmonics using multiples of 400.8 MHz, long and flat bunches held by multiples of 40.08 MHz and the so-called super-bunches which are confined by barrier buckets. The second part will be dedicated to the generation of the bunches with uniform line density by appropriate RF manipulations. It will be shown that especially the scheme to create long and flat bunches at multiples of 40.08 MHz relies on well proven RF techniques and can be performed in the LHC with additional RF hardware of reasonable size and performance. Using the Super Proton Synchrotron (SPS) as a test bed, a machine experiment to store long bunches has been performed. The results of this test will be discussed with respect to the long and flat bunch scheme proposed for the LHC.
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Associated with Events:
AD Seminar held on 28 Sep 2006 in 1 West
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