Beams Document 5762-v1

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Beam based RF voltage measurements and Longitudinal beam tomography at the Fermilab Booster for Intensity Upgrade

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Submitted by:
Chandrashekhara M. Bhat
Updated by:
Chandrashekhara M. Bhat
Document Created:
04 Aug 2017, 10:38
Contents Revised:
04 Aug 2017, 10:38
Metadata Revised:
04 Aug 2017, 10:38
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The required accelerating RF voltage during PIP-II era will need to be about 30% more than during the PIP era. Therefore, it is extremely important to find out the current RF voltage by carrying out beam-based measurements to specify the needed upgrades to the Booster RF system. During the beam cycle the magnetic field is changing all the time. Due to this, 1) measuring/calibrating the RF voltage used for beam capture and acceleration, 2) longitudinal beam tomography, are not trivial tasks. Here we present a method to accomplish both tasks near injection and extraction energies of the Booster. Python/Matlab programs* have been developed which use wall current monitor data to measure synchrotron frequencies and extract the RF voltage with an accuracy of ~3%. We have also attempted to obtain the beam tomography in the longitudinal phase space using these data. The method developed here is applicable to any similar RCSs in the world.
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  • pdf (DPF2017-cbhat-TALK-Beams-Doc.pdf, 2.9 MB)
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