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ABSTRACT: Rutherford Appleton Laboratory in Oxfordshire is home to an 800 MeV synchrotron particle accelerator called ISIS. Its main function is to direct a beam of protons into a heavy metal target to produce neutrons for scientists to analyse condensed matter. A second harmonic system is being developed to upgrade the beam current from 200 muA to 300 muA in order to drive a second target station. This is being achieved by the inclusion of four second harmonic cavities to increase the width of the RF bucket. In the past the six fundamental cavities were driven by an analogue Master Oscillator but the extra cavities will bring more difficultly in the phasing of the system. This could be more easily and precisely controlled by using a Direct Digital Synthesis system (DDS) as the heart of a new digital Master Oscillator. This paper describes the results of the setting up and performance of the prototype instrument so far and the implications it has for the synchrotron.
Particle Accelerator Conference, 2007. PAC. IEEE; 07/2007
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ABSTRACT: The ISIS facility at the Rutherford Appleton Laboratory in the UK is currently the most intense pulsed, spallation, neutron source. The accelerator consists of a 70 MeV H<sup>-</sup> linac and an 800 MeV, 50 Hz, rapid cycling proton synchrotron. The synchrotron beam intensity is typically 2.25 times 10<sup>13</sup> protons per pulse, corresponding to a mean current of 180 muA. The synchrotron beam is accelerated using six, ferrite loaded, RF cavities with harmonic number 2. Four additional, harmonic number 4, cavities have been installed to increase the beam bunching factor with the potential to raise the operating current to 300 muA. The dual harmonic system has now been used operationally for the first time, running reliably throughout the last ISIS user cycle of 2006. This paper reports on the hardware commissioning, beam tests and improved operational results obtained so far with dual harmonic acceleration.
Particle Accelerator Conference, 2007. PAC. IEEE; 07/2007
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[show abstract]
[hide abstract]
ABSTRACT: The ISIS facility at the Rutherford Appleton Laboratory in the UK is currently the most intense pulsed, spallation neutron source. The accelerator consists of a 70 MeV H-linac H-linac H-linac and an 800 MeV, 50 Hz, rapid cycling, proton synchrotron. The synchrotron beam intensity corresponds to a mean current of 200 μA. The synchrotron beam is accelerated using six, ferrite loaded, RF cavities with harmonic number 2. Four additional, harmonic number 4, cavities have been installed to increase the beam bunching factor with the potential of raising the operating current to 300 μA. This paper reports on the hardware commissioning and the first beam tests.
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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JWG Thomason,
DJ Adams,
DJS Findlay,
ISK Gardner,
B Jones,
AP Letchford,
SJ Payne,
BG Pine,
C Plostinar,
CR Prior,
GH Rees, A Seville,
C Warsop,
R Williamson
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[show abstract]
[hide abstract]
ABSTRACT: Rutherford Appleton Laboratory in Oxfordshire is home to an 800MeV synchrotron particle accelerator called ISIS. Its main function is to direct a beam of protons into a heavy metal target to produce neutrons for scientists to analyse condensed matter. A second harmonic system is being developed to upgrade the beam current from 200uA to 300uA in order to drive a second target station. This is being achieved by the inclusion of four second harmonic cavities to increase the width of the RF bucket. In the past the six fundamental cavities were driven by an analogue master oscillator but the extra cavities will bring more difficultly in the phasing of the system. This could be more easily and precisely controlled by embedding a Direct Digital Synthesis core into an FPGA chip as the heart of a new digital Master Oscillator. This paper describes the results of the setting up and performance of the prototype instrument and the implications it has for the synchrotron.
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DJS Findlay,
DJ Adams,
TA Broome,
MA Clarke-Gayther,
PV Drumm,
DC Faircloth,
PE Gear,
ISK Gardner,
MG Glover,
S Hughes,
HJ Jones,
M Krendler,
HP Letchford,
EJ McCarron,
SJ Payne,
CR Prior, A Seville,
JWG Thomason,
CM Warsop
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[show abstract]
[hide abstract]
ABSTRACT: The ISIS facility at the Rutherford Appleton Laboratory in the UK is currently the most intense pulsed, spallation, neutron source. The accelerator consists of a 70 MeV H- linac and an 800 MeV, 50 Hz, rapid cycling, proton synchrotron. The synchrotron beam intensity is 2.5E13 protons per pulse, corresponding to a mean current of 200 uA. The synchrotron beam is accelerated using six, ferrite loaded, RF cavities with harmonic number 2. Four additional, harmonic number 4, cavities have been installed to increase the beam bunching factor with the potential of raising the operating current to 300 uA. The dual harmonic system has now been used operationally for the first time, running reliably throughout the last ISIS user cycle of 2006. This paper reports on the hardware commissioning, beam tests and improved operational results obtained so far with dual harmonic acceleration.
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Y Irie,
D Bayley,
JC Dooling,
S Fukumoto,
I Gardner,
D. Horan,
R. Kustom,
ME Middendorf,
K Muto,
T Oki, A Seville,
A Takagi,
J Thomason
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ATLAS Collaboration,
Y Irie,
J Dooling,
D. Horan,
R. Kustom,
M Middendorf,
G. Pile,
DL Bayley,
GM Cross,
ISK Gardner, [......],
WA Morris, A Seville,
SP Stoneham,
JWG Thomason,
T Western,
S Fukumoto,
K Muto,
T Oki,
A Takagi,
S Takano
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Y Irie,
S Fukumoto,
K Muto,
H Nakanishi,
T Oki,
A Takagi,
J Dooling,
D. Horan,
R. Kustom,
M Middendorf,
D Bayley,
I Gardner,
R Mathieson, A Seville,
J Thomason
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JWG Thomason,
DJ Adams,
DJS Findlay,
ISK Gardner,
SJS Jago,
B Jones,
AP Letchford,
RJ Mathieson,
J Pasternak,
SJ Payne,
BG Pine, A Seville,
HV Smith,
CM Warsop,
RE Williamson,
CR Prior,
GH Rees
