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Your search keyword '"Pozimski, J. K."' showing total 12 results
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12 results on '"Pozimski, J. K."'

1. Demonstration of a laserwire emittance scanner for the CERN LINAC4 H- Beam

Author

Hofmann, T., Kruchinin, K. O., Bosco, A., Gibson, S. M., Roncarolo, F., Boorman, G., Raich, U., Bravin, E., Pozimski, J. K., Letchford, A., and Gabor, C.

Subjects
Physics - Accelerator Physics
Abstract

A non-invasive, compact laserwire system has been developed to measure the transverse emittance of an H- beam and has been demonstrated at the new LINAC4 injector for the LHC at CERN. Light from a low power, pulsed laser source is conveyed via fibre to collide with the H- beam, a fraction of which is neutralized and then intercepted by a downstream diamond detector. Scanning the focused laser across the H- beam and measuring the distribution of the photo-neutralized particles enables the transverse emittance to be reconstructed. The vertical phase-space distribution of a 3 MeV beam during LINAC4 commissioning has been measured by the laserwire and verified with a conventional slit and grid method., Comment: 10 pages, 13 figures, to be published in Physical Review Special Topics - Accelerators and Beams

Published
2015
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2. Description of laser transport and delivery system for the FETS laserwire emittance scanner

Author

Bosco, A., Boorman, G., Emery, S., Stephen Gibson, Pozimski, J. K., Savage, P., Letchford, A. P., Gabor, C., and Hofmann, T.

Subjects
Physics::Optics, Physics::Accelerator Physics, Physics::Atomic Physics, Accelerators and Storage Rings
Abstract

A beam emittance monitor for H- beams based on laserinduced ions neutralization is being developed at the Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL). In this paper we present a full account of the laser system that will be used for the photodetachment experiment, the optical transport system and the final delivery assembly. All the relevant measurements such as power, spatial and temporal characteristics of the laser, fiber coupling efficiency and final delivery laser beam parameters will be reported.

Published
2013

7. Commissioning the Front End Test Stand High Performance H[sup −] Ion Source at RAL

Author

Faircloth, D. C., primary, Lawrie, S., additional, Letchford, A. P., additional, Gabor, C., additional, Wise, P., additional, Whitehead, M., additional, Wood, T., additional, Perkins, M., additional, Bates, M., additional, Savage, P. J., additional, Lee, D. A., additional, Pozimski, J. K., additional, Surrey, Elizabeth, additional, and Simonin, Alain, additional

Published
2009
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9. Commissioning the Front End Test Stand High Performance H- Ion Source at RAL.

Author

Faircloth, D. C., Lawrie, S., Letchford, A. P., Gabor, C., Wise, P., Whitehead, M., Wood, T., Perkins, M., Bates, M., Savage, P. J., Lee, D. A., and Pozimski, J. K.

Subjects
ION sources, PROTON accelerators, PARTICLES (Nuclear physics), NEUTRON sources, PHYSICS research
Abstract

The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 p.p.s. and sufficiently high beam quality for future high-power proton accelerators (HPPA). High power proton accelerators with beam powers in the several megawatt range have many applications including drivers for spallation neutron sources, neutrino factories, waste transmuters and tritium production facilities. The aim of the FETS project is to demonstrate that chopped low energy beams of high quality can be produced and is intended to allow generic experiments exploring a variety of operational conditions. This paper details the first stage of construction- the installation and commissioning of the ion source. Initial performance figures are reported. [ABSTRACT FROM AUTHOR]

Published
2009
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10. Plasma meniscus and extraction electrode studies of the ISIS H- ion source.

Author

Lawrie, S. R., Faircloth, D. C., Letchford, A. P., Gabor, C., and Pozimski, J. K.

Subjects
NUCLEAR physics instruments, ELECTRON cyclotron resonance sources, ION sources, CAPILLARITY, SURFACE tension, PROPERTIES of matter
Abstract

In order to reduce the emittance and increase the transported beam current from the ISIS Penning-type H- ion source, improvements to the extraction system are required. This ion source is currently being commissioned on the front end test stand at the Rutherford Appleton Laboratory, which demands higher extraction energies, higher beam currents, and smaller emittances. To facilitate this, the present geometry requires optimization. This paper details the experimental and simulation studies performed of the plasma meniscus and the possible electrode geometry modifications needed to extract the highest quality beam. [ABSTRACT FROM AUTHOR]

Published
2010
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11. The front end test stand high performance H- ion source at Rutherford Appleton Laboratory.

Author

Faircloth, D. C., Lawrie, S., Letchford, A. P., Gabor, C., Wise, P., Whitehead, M., Wood, T., Westall, M., Findlay, D., Perkins, M., Savage, P. J., Lee, D. A., and Pozimski, J. K.

Subjects
INDUSTRIAL lasers, FREQUENCIES of oscillating systems, RADIO measurements, INDUSTRIAL productivity measurement, RADIO frequency, ION sources
Abstract

The aim of the front end test stand (FETS) project is to demonstrate that chopped low energy beams of high quality can be produced. FETS consists of a 60 mA Penning Surface Plasma Ion Source, a three solenoid low energy beam transport, a 3 MeV radio frequency quadrupole, a chopper, and a comprehensive suite of diagnostics. This paper details the design and initial performance of the ion source and the laser profile measurement system. Beam current, profile, and emittance measurements are shown for different operating conditions. [ABSTRACT FROM AUTHOR]

Published
2010
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12. Status of the ral front end test stand

Author

Letchford, A. P., Clarke-Gayther, M. A., Faircloth, D. C., Findlay, D. J. S., Lawrie, S. R., Romano, P., Wise, P., Bermejo, F. J., Lucas, J., Alonso, J., RAFAEL ENPARANTZA, Al Sari, S. M. H., Jolly, S., Kurup, A., Lee, D. A., Savage, P., Pasternak, J., Pozimski, J. K., Gabor, C., Plostinar, C., and Back, J. J.

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