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Preprints and Communications
 Here you can find JINR preprints and communications in pdf format starting from 1999. File size is given in bytes in round brackets.
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P13-2025-2 (2.515.072)
Mitrofanov S.V. et al.
Beam Profile Measurement at the Entrance of the Gas-Filled Solenoid GASSOL
A beam profilometer has been developed and tested for use at the entrance
of the gas-filled solenoid GASSOL during its commissioning and adjustment.
The profilometer is constructed as a mosaic of cathodes, each measuring current
generated by secondary emission during bombardment by accelerated ions being
measured from each cathode. A corresponding number of current amplifier
channels is used to measure the currents from the cathodes. A software program
has been developed for visualizing the beam profile. During an experiment with
a 40Ar+4 ion beam at an energy of 4 MeV per nucleon, the lower sensitivity limit
of the profilometer was found to be less than 0.001 pnA. The upper sensitivity
limit, determined through thermal calculations, is 100 pnA. A critical factor is
the risk of signal cable contact failures due to heating. The accuracy of beam
centre determination, ∓1 mm, falls within the specified tolerance for radial
displacement of the beam axis relative to the magnetic axis of the solenoid.
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