SRF2015 - List of Keywords (power-supply)

Paper	Title	Other Keywords	Page
TUPB002	Elimination of High Frequency Noise From the Beam in the Diamond Light Source Storage Ring	storage-ring, operation, synchrotron, controls	525
	C. Christou, A. Bogusz, P.J. Marten DLS, Oxfordshire, United Kingdom
	High frequency beam motion has been identified as a source of noise in infrared beamlines in a number of synchrotron light sources. Diamond is a third generation synchrotron light source with storage ring current maintained by two superconducting CESR-B cavities powered by IOT-driven RF amplifiers. In our case, undesirable beam motion in the kilohertz range is predominantly driven by spectral content in the voltage across the IOTs arising from the switched mode nature of the high voltage power supply. Spectral noise on the amplifiers and beam has been identified and characterised and efforts to eliminate this noise are described. Care has been taken to maintain the overall stability of the RF at Diamond and tests have been carried out on an infrared beamline to investigate the degree to which beam noise impacts beamline operation in its different operating configurations.
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TUPB040	High Power Impulse Magnetron Sputtering of Thin Films for Superconducting RF Cavities	target, radio-frequency, scattering, vacuum	647
	S. Wilde, B. Chesca Loughborough University, Loughborough, Leicestershire, United Kingdom E. Alves Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Lisboa, Portugal N.P. Barradas Universidade de Lisboa, Instituto Superior Técnico, Bobadela, Portugal A.N. Hannah, O.B. Malyshev, S.M. Pattalwar, R. Valizadeh STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom G.B.G. Stenning STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The production of superconducting coatings for radio frequency cavities is a rapidly developing field that should ultimately lead to acceleration gradients greater than those obtained by bulk Nb RF cavities. Optimizing superconducting properties of Nb and Nb compound thin-films is therefore essential. Nb films were deposited by magnetron sputtering in pulsed DC mode onto Si (100) and MgO (100) substrates and also by high impulse magnetron sputtering (HiPIMS) onto Si (100), MgO (100) and polycrystalline Cu. HiPIMS was then used to deposit NbN and NbTiN thin films onto Si(100) and polycrystalline Cu. The films were characterised using scanning electron microscopy, x-ray diffraction, DC SQUID magnetometry and Q factor for a flat thin film sample.
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Paper

Title

Other Keywords

Page

TUPB002

Elimination of High Frequency Noise From the Beam in the Diamond Light Source Storage Ring

storage-ring, operation, synchrotron, controls

525

C. Christou, A. Bogusz, P.J. Marten
DLS, Oxfordshire, United Kingdom

High frequency beam motion has been identified as a source of noise in infrared beamlines in a number of synchrotron light sources. Diamond is a third generation synchrotron light source with storage ring current maintained by two superconducting CESR-B cavities powered by IOT-driven RF amplifiers. In our case, undesirable beam motion in the kilohertz range is predominantly driven by spectral content in the voltage across the IOTs arising from the switched mode nature of the high voltage power supply. Spectral noise on the amplifiers and beam has been identified and characterised and efforts to eliminate this noise are described. Care has been taken to maintain the overall stability of the RF at Diamond and tests have been carried out on an infrared beamline to investigate the degree to which beam noise impacts beamline operation in its different operating configurations.

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

TUPB040

High Power Impulse Magnetron Sputtering of Thin Films for Superconducting RF Cavities

target, radio-frequency, scattering, vacuum

647

S. Wilde, B. Chesca
Loughborough University, Loughborough, Leicestershire, United Kingdom
E. Alves
Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Lisboa, Portugal
N.P. Barradas
Universidade de Lisboa, Instituto Superior Técnico, Bobadela, Portugal
A.N. Hannah, O.B. Malyshev, S.M. Pattalwar, R. Valizadeh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
G.B.G. Stenning
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The production of superconducting coatings for radio frequency cavities is a rapidly developing field that should ultimately lead to acceleration gradients greater than those obtained by bulk Nb RF cavities. Optimizing superconducting properties of Nb and Nb compound thin-films is therefore essential. Nb films were deposited by magnetron sputtering in pulsed DC mode onto Si (100) and MgO (100) substrates and also by high impulse magnetron sputtering (HiPIMS) onto Si (100), MgO (100) and polycrystalline Cu. HiPIMS was then used to deposit NbN and NbTiN thin films onto Si(100) and polycrystalline Cu. The films were characterised using scanning electron microscopy, x-ray diffraction, DC SQUID magnetometry and Q factor for a flat thin film sample.

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)