Mark Boland - Academia.edu (original) (raw)
Papers by Mark Boland
The technique of frequency map analysis has been applied to study the transverse dynamic aperture... more The technique of frequency map analysis has been applied to study the transverse dynamic aperture of the Australian Synchrotron Storage Ring. The results have been used to set the strengths of sextupoles to optimise the dynamic aperture. The effects of the allowed harmonics in the quadrupoles and dipole edge effects are discussed.
The Australian Synchrotron (AS) is equipped with a full compliment of 98 BPMs attached to Libera ... more The Australian Synchrotron (AS) is equipped with a full compliment of 98 BPMs attached to Libera Electron Beam Position Processors (EBPPs) [1] that are capable of measuring turn-by-turn/first turn and averaged beam positions simultaneously. The BPM system coupled with Matlab applications has simplified the process of commissioning. This report will highlight how the various tools have been utilised and show the results of some studies.
We present the preliminary results of an impedance study of the Australian Synchrotron storage ri... more We present the preliminary results of an impedance study of the Australian Synchrotron storage ring. Beam stability thresholds have been determined and an overall impedance budget set.
The 3GeV Australian Synchrotron [1,2] will begin operation in March 2007. This paper outlines the... more The 3GeV Australian Synchrotron [1,2] will begin operation in March 2007. This paper outlines the tune and lifetime measurement systems. It also provides a summary of a number of studies completed using these systems. Three different tune measurement systems have been tested. Lifetime measurements made using the DCCT were used to optimise the strengths of the harmonic sextupoles and the location of the tunes. The vertical aperture was determined using scrapers. Betafunction measurements have been completed by shunting individual quadrupoles and noting the resultant tune changes. Chromaticity measurements have been made by observing the change in tune as the RF frequency is varied.
Two diagnostic beamlines have been designed and constructed for the Australian Synchrotron Storag... more Two diagnostic beamlines have been designed and constructed for the Australian Synchrotron Storage Ring [1]. One diagnostic beamline is a simple x-ray pinhole camera system, with a BESSY II style pinhole array [2], designed to measure the beam divergence, size and stability. The second diagnostic beamline uses an optical chicane to extract the visible light from the photon beam and transports it to various instruments. The end-station of the optical diagnostic beamline is equipped with a streak camera, a fast ICCD camera, a CCD camera and a Fill Pattern Monitor to analyse and optimise the electron beam using the visible synchrotron light.
First Light has been achieved on the diagnostic beamlines at the Australian Synchrotron 3 GeV sto... more First Light has been achieved on the diagnostic beamlines at the Australian Synchrotron 3 GeV storage ring. The X-ray Diagnostic Beamline (XDB) has been used to measure the beam size, divergence and emittance, while the Optical Diagnostic Beamline (ODB) has been used the measure the bunch length and turn-by-turn stability. Both beamlines receive dipole radiation from a bend magnet and provide continuous diagnostic data to the control room. The beamlines compliment each other with the ODB providing mainly longitudinal (temporal) information, while the XDB measures predominantly transverse (spatial) information. A brief description is given of the equipment on each beamline and the commissioning results are presented.
The unprecedented requirements that new machines are setting on their diagnostic systems is leadi... more The unprecedented requirements that new machines are setting on their diagnostic systems is leading to the devel-opment of new generation of devices with large dynamic range, sensitivity and time resolution. Beam loss detec-tion is particularly challenging due to the large extension of new facilities that need to be covered with localized detector. Candidates to mitigate this problem consist of systems in which the sensitive part of the radiation detec-tors can be extended over long distance of beam lines. In this document we study the feasibility of a BLM system based on optical f ber as an active detector for an electron storage ring. The Australian Synchrotron (AS) comprises a 216 m ring that stores electrons up to 3 GeV. The Ac-celerator has recently claimed the world record ultra low transverse emittance (below pm rad) and its surroundings are rich in synchrotron radiation. Therefore, the AS pro-vides beam conditions very similar to those expected in the CLIC/ILC damping rings....
2007 IEEE Particle Accelerator Conference (PAC), 2007
The Australian Synchrotron's Storage Ring is equipped with a full compliment of 98 Libera Electro... more The Australian Synchrotron's Storage Ring is equipped with a full compliment of 98 Libera Electron Beam Position Processors from I-Tech (EBPPs) . The EBPPs are capable of measuring beam position data at turn-byturn (TBT) rates and have long history buffers. TBT data from the EBPPs has been used to determine the linear optics of the storage ring lattice using techniques developed at other facilities. This is a useful complement to other methods of determining the linear optics such as LOCO. Characteristics of the EBPPs such as beam current dependence have been studied during commissioning and will also be presented.
2007 IEEE Particle Accelerator Conference (PAC), 2007
LOCO has been used during the commissioning of the Australian Synchrotron storage ring with a num... more LOCO has been used during the commissioning of the Australian Synchrotron storage ring with a number of benefits. The LOCO (linear optics from close orbits) method compares a model response matrix to the real machine response matrix. Using this approach we are able to adjust the machine to match the ideal model. Results presented here show that LOCO has provided a high degree of control over a wide range of machine parameters.
2007 IEEE Particle Accelerator Conference (PAC), 2007
There are always a number of factors that contribute to the lifetime of a stored particle beam. M... more There are always a number of factors that contribute to the lifetime of a stored particle beam. Measurements presented here show the relative importance of these effects during the commissioning of the Australian Synchrotron storage ring.
Turbulent cooling water in the Compact Linear Collider (CLIC) accelerating structures will inevit... more Turbulent cooling water in the Compact Linear Collider (CLIC) accelerating structures will inevitably induce some vibrations. The maximum acceptable amplitude of vibrations is small, as vibrations in the accelerating structure could lead to beam jitter and alignment difficulties. A Finite Element Analysis model is needed to identify the conditions under which turbulent instabilities and significant vibrations are induced. Due to
2007 IEEE Particle Accelerator Conference (PAC), 2007
In this paper we present the first measurements of machine impedance and observed beam instabilit... more In this paper we present the first measurements of machine impedance and observed beam instabilities at the Australian Synchrotron. Impedance measurements are made by studying the single bunch behaviour with beam current, using optical and X-ray diagnostic beamlines. An observed coupled-bunch instability, its cause and cure is also discussed.
Studies using a single high charge electron bunch have been conducted at the Australian Synchrotr... more Studies using a single high charge electron bunch have been conducted at the Australian Synchrotron to charac- terise the impedance of the machine at various stages of commissioning and insertion device configuration. This paper will present the results of these studies and show the time evolutionof machineimpedancewith increasingnum- ber of insertion devices. OVERVIEW The Australian Synchrotron is a rd generation light source facility located in Melbourne, Australia. Commis- sioning was conducted in 2006, with beamline operations commencing in April 2007. The 3 GeV storage ring is 216 metres in circumference and can store a beam of up to 200 mA current. A design overview can be found in (1). The first phase of beamline development consists of 9 initial beamlines, 5 of which are currently in operation and the other 4 are in late stages of construction. Of these 9 beam- lines, 6 will use insertion devices (IDs), 3 being In-Vacuum Undulators (IVUs). Both kinds of insertion devices req...
Turbulent cooling water in the Compact Linear Collider (CLIC) accelerating structures will inevit... more Turbulent cooling water in the Compact Linear Collider (CLIC) accelerating structures will inevitably induce some vibrations. The maximum acceptable amplitude of vibrations is small, as vibrations in the accelerating structure could lead to beam jitter and alignment difficulties. A Finite Element Analysis model is needed to identify the conditions under which turbulent instabilities and significant vibrations are induced. Due to the orders of magnitude difference between the fluid motion and the structure's motion, small vibrations of the structure will not contribute to the turbulence of the cooling fluid. Therefore the resonant conditions of the cooling channels presented in this paper, directly identify the natural frequencies of the accelerating structures to be avoided under normal operating conditions. In this paper a 2D model of the cooling channel is presented finding spots of turbulence being formed from a shear layer instability. This effect is observed through direct visualisation and wavelet analysis.
The technique of frequency map analysis has been applied to study the transverse dynamic aperture... more The technique of frequency map analysis has been applied to study the transverse dynamic aperture of the Australian Synchrotron Storage Ring. The results have been used to set the strengths of sextupoles to optimise the dynamic aperture. The effects of the allowed harmonics in the quadrupoles and dipole edge effects are discussed.
The Australian Synchrotron (AS) is equipped with a full compliment of 98 BPMs attached to Libera ... more The Australian Synchrotron (AS) is equipped with a full compliment of 98 BPMs attached to Libera Electron Beam Position Processors (EBPPs) [1] that are capable of measuring turn-by-turn/first turn and averaged beam positions simultaneously. The BPM system coupled with Matlab applications has simplified the process of commissioning. This report will highlight how the various tools have been utilised and show the results of some studies.
We present the preliminary results of an impedance study of the Australian Synchrotron storage ri... more We present the preliminary results of an impedance study of the Australian Synchrotron storage ring. Beam stability thresholds have been determined and an overall impedance budget set.
The 3GeV Australian Synchrotron [1,2] will begin operation in March 2007. This paper outlines the... more The 3GeV Australian Synchrotron [1,2] will begin operation in March 2007. This paper outlines the tune and lifetime measurement systems. It also provides a summary of a number of studies completed using these systems. Three different tune measurement systems have been tested. Lifetime measurements made using the DCCT were used to optimise the strengths of the harmonic sextupoles and the location of the tunes. The vertical aperture was determined using scrapers. Betafunction measurements have been completed by shunting individual quadrupoles and noting the resultant tune changes. Chromaticity measurements have been made by observing the change in tune as the RF frequency is varied.
Two diagnostic beamlines have been designed and constructed for the Australian Synchrotron Storag... more Two diagnostic beamlines have been designed and constructed for the Australian Synchrotron Storage Ring [1]. One diagnostic beamline is a simple x-ray pinhole camera system, with a BESSY II style pinhole array [2], designed to measure the beam divergence, size and stability. The second diagnostic beamline uses an optical chicane to extract the visible light from the photon beam and transports it to various instruments. The end-station of the optical diagnostic beamline is equipped with a streak camera, a fast ICCD camera, a CCD camera and a Fill Pattern Monitor to analyse and optimise the electron beam using the visible synchrotron light.
First Light has been achieved on the diagnostic beamlines at the Australian Synchrotron 3 GeV sto... more First Light has been achieved on the diagnostic beamlines at the Australian Synchrotron 3 GeV storage ring. The X-ray Diagnostic Beamline (XDB) has been used to measure the beam size, divergence and emittance, while the Optical Diagnostic Beamline (ODB) has been used the measure the bunch length and turn-by-turn stability. Both beamlines receive dipole radiation from a bend magnet and provide continuous diagnostic data to the control room. The beamlines compliment each other with the ODB providing mainly longitudinal (temporal) information, while the XDB measures predominantly transverse (spatial) information. A brief description is given of the equipment on each beamline and the commissioning results are presented.
The unprecedented requirements that new machines are setting on their diagnostic systems is leadi... more The unprecedented requirements that new machines are setting on their diagnostic systems is leading to the devel-opment of new generation of devices with large dynamic range, sensitivity and time resolution. Beam loss detec-tion is particularly challenging due to the large extension of new facilities that need to be covered with localized detector. Candidates to mitigate this problem consist of systems in which the sensitive part of the radiation detec-tors can be extended over long distance of beam lines. In this document we study the feasibility of a BLM system based on optical f ber as an active detector for an electron storage ring. The Australian Synchrotron (AS) comprises a 216 m ring that stores electrons up to 3 GeV. The Ac-celerator has recently claimed the world record ultra low transverse emittance (below pm rad) and its surroundings are rich in synchrotron radiation. Therefore, the AS pro-vides beam conditions very similar to those expected in the CLIC/ILC damping rings....
2007 IEEE Particle Accelerator Conference (PAC), 2007
The Australian Synchrotron's Storage Ring is equipped with a full compliment of 98 Libera Electro... more The Australian Synchrotron's Storage Ring is equipped with a full compliment of 98 Libera Electron Beam Position Processors from I-Tech (EBPPs) . The EBPPs are capable of measuring beam position data at turn-byturn (TBT) rates and have long history buffers. TBT data from the EBPPs has been used to determine the linear optics of the storage ring lattice using techniques developed at other facilities. This is a useful complement to other methods of determining the linear optics such as LOCO. Characteristics of the EBPPs such as beam current dependence have been studied during commissioning and will also be presented.
2007 IEEE Particle Accelerator Conference (PAC), 2007
LOCO has been used during the commissioning of the Australian Synchrotron storage ring with a num... more LOCO has been used during the commissioning of the Australian Synchrotron storage ring with a number of benefits. The LOCO (linear optics from close orbits) method compares a model response matrix to the real machine response matrix. Using this approach we are able to adjust the machine to match the ideal model. Results presented here show that LOCO has provided a high degree of control over a wide range of machine parameters.
2007 IEEE Particle Accelerator Conference (PAC), 2007
There are always a number of factors that contribute to the lifetime of a stored particle beam. M... more There are always a number of factors that contribute to the lifetime of a stored particle beam. Measurements presented here show the relative importance of these effects during the commissioning of the Australian Synchrotron storage ring.
Turbulent cooling water in the Compact Linear Collider (CLIC) accelerating structures will inevit... more Turbulent cooling water in the Compact Linear Collider (CLIC) accelerating structures will inevitably induce some vibrations. The maximum acceptable amplitude of vibrations is small, as vibrations in the accelerating structure could lead to beam jitter and alignment difficulties. A Finite Element Analysis model is needed to identify the conditions under which turbulent instabilities and significant vibrations are induced. Due to
2007 IEEE Particle Accelerator Conference (PAC), 2007
In this paper we present the first measurements of machine impedance and observed beam instabilit... more In this paper we present the first measurements of machine impedance and observed beam instabilities at the Australian Synchrotron. Impedance measurements are made by studying the single bunch behaviour with beam current, using optical and X-ray diagnostic beamlines. An observed coupled-bunch instability, its cause and cure is also discussed.
Studies using a single high charge electron bunch have been conducted at the Australian Synchrotr... more Studies using a single high charge electron bunch have been conducted at the Australian Synchrotron to charac- terise the impedance of the machine at various stages of commissioning and insertion device configuration. This paper will present the results of these studies and show the time evolutionof machineimpedancewith increasingnum- ber of insertion devices. OVERVIEW The Australian Synchrotron is a rd generation light source facility located in Melbourne, Australia. Commis- sioning was conducted in 2006, with beamline operations commencing in April 2007. The 3 GeV storage ring is 216 metres in circumference and can store a beam of up to 200 mA current. A design overview can be found in (1). The first phase of beamline development consists of 9 initial beamlines, 5 of which are currently in operation and the other 4 are in late stages of construction. Of these 9 beam- lines, 6 will use insertion devices (IDs), 3 being In-Vacuum Undulators (IVUs). Both kinds of insertion devices req...
Turbulent cooling water in the Compact Linear Collider (CLIC) accelerating structures will inevit... more Turbulent cooling water in the Compact Linear Collider (CLIC) accelerating structures will inevitably induce some vibrations. The maximum acceptable amplitude of vibrations is small, as vibrations in the accelerating structure could lead to beam jitter and alignment difficulties. A Finite Element Analysis model is needed to identify the conditions under which turbulent instabilities and significant vibrations are induced. Due to the orders of magnitude difference between the fluid motion and the structure's motion, small vibrations of the structure will not contribute to the turbulence of the cooling fluid. Therefore the resonant conditions of the cooling channels presented in this paper, directly identify the natural frequencies of the accelerating structures to be avoided under normal operating conditions. In this paper a 2D model of the cooling channel is presented finding spots of turbulence being formed from a shear layer instability. This effect is observed through direct visualisation and wavelet analysis.