IBIC2019 - List of Authors (Williamson, R.E.)

Paper	Title	Page
MOPP031	Optimisation of the ISIS Proton Synchrotron Experimental Damping System	167
	A. Pertica, D.W. Posthuma de Boer, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom J. Komppula CERN, Meyrin, Switzerland
	The ISIS Neutron and Muon Source, located in the UK, consists of a H⁻ linear accelerator, a rapid cycling proton synchrotron and two extraction lines delivering protons onto heavy metal targets. One of the limiting factors for achieving higher intensities in the accelerator is the head-tail instability present in the synchrotron, around 2ms after injection. In order to mitigate this instability, an experimental damping system is being developed for the ISIS synchrotron. Initial tests using a split electrode BPM as a pickup and a ferrite loaded kicker as a damper showed positive results. This paper describes the different developments made to the damping system and planned improvements to optimize its performance for use in normal operations.
	Poster MOPP031 [1.557 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP031
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPP037	Studies of the Time Structure of Ionisation Beam Profile Measurements in the ISIS Extracted Proton Beamline	412
	C.C. Wilcox, W.A. Frank, A. Pertica, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Ionisation Profile Monitors (IPMs) are used at the ISIS neutron and muon source to perform non-destructive transverse beam profile measurements. An in-house particle tracking code, combined with 3D CST modelling of the electric fields within the monitors, has been used to improve understanding of the various error sources within the IPMs, and shows close agreement with profile measurements in the synchrotron. To allow for detailed benchmarking studies, an IPM has been installed in Extracted Proton Beamline 1 (EPB1), enabling comparison with secondary emission (SEM) grid measurements. However, the IPM measurements taken in EPB1 show increased levels of profile broadening at operational beam intensities, which are not reproduced by SEM measurements or simulation. To investigate these differences, studies of the time structure of measured profiles are being performed. This paper details the development of new, high-speed multichannel data acquisition electronics, required to perform these studies. Resulting measurements are discussed, along with an analysis of the data¿s time structure and a comparison with that predicted by the IPM code.
	Poster TUPP037 [1.102 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP037
About •	paper received ※ 04 September 2019 paper accepted ※ 11 September 2019 issue date ※ 10 November 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Optimisation of the ISIS Proton Synchrotron Experimental Damping System

167

A. Pertica, D.W. Posthuma de Boer, R.E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J. Komppula
CERN, Meyrin, Switzerland

The ISIS Neutron and Muon Source, located in the UK, consists of a H⁻ linear accelerator, a rapid cycling proton synchrotron and two extraction lines delivering protons onto heavy metal targets. One of the limiting factors for achieving higher intensities in the accelerator is the head-tail instability present in the synchrotron, around 2ms after injection. In order to mitigate this instability, an experimental damping system is being developed for the ISIS synchrotron. Initial tests using a split electrode BPM as a pickup and a ferrite loaded kicker as a damper showed positive results. This paper describes the different developments made to the damping system and planned improvements to optimize its performance for use in normal operations.

Poster MOPP031 [1.557 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP031

About •

paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPP037

Studies of the Time Structure of Ionisation Beam Profile Measurements in the ISIS Extracted Proton Beamline

412

C.C. Wilcox, W.A. Frank, A. Pertica, R.E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Ionisation Profile Monitors (IPMs) are used at the ISIS neutron and muon source to perform non-destructive transverse beam profile measurements. An in-house particle tracking code, combined with 3D CST modelling of the electric fields within the monitors, has been used to improve understanding of the various error sources within the IPMs, and shows close agreement with profile measurements in the synchrotron. To allow for detailed benchmarking studies, an IPM has been installed in Extracted Proton Beamline 1 (EPB1), enabling comparison with secondary emission (SEM) grid measurements. However, the IPM measurements taken in EPB1 show increased levels of profile broadening at operational beam intensities, which are not reproduced by SEM measurements or simulation. To investigate these differences, studies of the time structure of measured profiles are being performed. This paper details the development of new, high-speed multichannel data acquisition electronics, required to perform these studies. Resulting measurements are discussed, along with an analysis of the data¿s time structure and a comparison with that predicted by the IPM code.

Poster TUPP037 [1.102 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP037

About •

paper received ※ 04 September 2019 paper accepted ※ 11 September 2019 issue date ※ 10 November 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)