Abstract
A residual gas ionization profile monitor has been recently installed in the CERN proton synchrotron. We present the design for a novel and simplified field cage structure that suppresses the secondary electrons that are induced by the ionized ions. We discuss the field cage design and the beam size and emittance systematic error considering the non-uniformity of the fields, the space-charge effect of the beam, and the lattice parameter errors.
Highlights
A new ionization profile monitor (IPM) has been developed and installed in the CERN proton-synchrotron (CPS) which includes a number of novel features, in particular: an electron imaging detector comprising multi-pixel silicon detectors that are bonded on Timepix3 readout chips
[1]; a novel field cage to provide an electric field ( ) to accelerate the ionized electrons onto the imaging detector that suppresses the creation of background secondary electrons; a 3-pole self-compensating magnet to provide a
The first performance report of this IPM system was recently published [3], and the measured beam size was observed to be in good agreement (1% error) with the value that was measured using a wire-scanner monitor in the CPS
Summary
A new ionization profile monitor (IPM) has been developed and installed in the CERN proton-synchrotron (CPS) which includes a number of novel features, in particular: an electron imaging detector comprising multi-pixel silicon detectors that are bonded on Timepix readout chips [1]; a novel field cage to provide an electric field ( ) to accelerate the ionized electrons onto the imaging detector that suppresses the creation of background secondary electrons; a 3-pole self-compensating magnet to provide a. 0.2 T magnetic field ( ) to guide the electrons onto the imaging detector against a strong space charge electric field ( ) and a novel 3-D particle-tracking code to simulate the profile to estimate the IPM-performance. The IPM was installed in the CPS at SS82 (s = 510−511 m) to measure the horizontal profile. The twissparameters at this location are = 12 m, = 22 m, and. Is typically 0.9E−3 for an injection beam and 1.5E−3 for an extraction beam. = 2.3), the horizontal size is 3.4 mm, which is 1.4 times larger than the beam size excluding the momentum dispersion. The beam sizes at the injection and the extraction are observed to be similar. The vertical beam size decreases to 1/3.5 as increases
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