| Paper |
Title |
Page |
| MOPLT029 |
All Digital IQ Servo-system for CERN Linacs
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605 |
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- A. Rohlev, J. Broere, R. Garoby, I. Kozsar, J. Serrano
CERN, Geneva
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A VME based control system has been developed and built at CERN for the servo loops regulating the field in linac accelerating structures. It is an all-digital system built on a single VME card, providing digital detection, processing, and modulation. It is foreseen to be used, in different versions, for the needs of both present and future CERN hadron linacs. The first application will be in the energy ramping RF chain of the CERN Heavy Ion Linac (linac 3). In addition to regulating the cavity field, the system incorporates the measurement and control of the cavity resonance as well as an imbedded loop stabilizing the gain and the phase of the final amplifier operating near saturation. The design principle and the experimental results are described.
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| WEPLT015 |
Proposal for the Creation and Storage of Long Bunches in the LHC
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1849 |
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- H. Damerau, R. Garoby
CERN, Geneva
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Long bunches with a uniform longitudinal line density held by barrier buckets are considered for a future luminosity upgrade of the Large Hadron Collider (LHC). With such bunches, the luminosity is maximised for a fixed number of particles. Instead of conventional barrier buckets, periodic barriers are proposed. These are generated with multiple RF harmonics (e.g. multiples of 40 MHz). A possible scheme to create and hold long flat bunches in the LHC is described, and the resulting gain in luminosity is estimated.
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