IPAC2017 - List of Authors (Bobb, L.M.)

Paper	Title	Page
MOPAB118	Cherenkov Diffraction Radiation From Long Dielectric Material: An Intense Source of Photons in the NIR-THz Range	400
	T. Lefèvre, M. Bergamaschi, O.R. Jones, R. Kieffer, S. Mazzoni CERN, Geneva, Switzerland M.G. Billing, J.V. Conway, J.P. Shanks Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA L.M. Bobb DLS, Oxfordshire, United Kingdom P. Karataev Royal Holloway, University of London, Surrey, United Kingdom
	This paper presents the design on the Cornell Electron Storage Ring (CESR) of an experimental set-up to meas-ure incoherent Diffraction Cherenkov Radiation (DChR) produced in a 2 cm long SiO2 radiator by a 2.1 GeV elec-tron beam. The electron beam is circulating at a distance of few mm from the edge of the radiator and the DChR photon output power is expected to be significantly higher than the diffraction radiation power emitted from a metal-lic slit of similar aperture. The radiator design and the detection set-up are presented in detail together with sim-ulations describing the expected properties of the emitted DChR in terms of light intensity and spectral bandwidth. Finally, potential applications of DChR are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB118
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MOPAB132	Beam Size Measurement Using High Aspect Ratio LIGA Apertures in an X-Ray Pinhole Camera	445
	L.M. Bobb, G. Rehm DLS, Oxfordshire, United Kingdom
	For optimal brilliance third generation light sources operate at a low emittance and low coupling. Commonly, transverse beam profile measurements are provided by direct imaging of the electron beam using X-ray pinhole cameras. From these beam size measurements and given knowledge of the lattice parameters the emittance, coupling and energy spread are calculated. Ideally, the pinhole aperture should be formed in an infinitely thin screen. However, due to the penetration of X-rays in the keV spectral range, stacked tungsten blades are often used to form the pinhole aperture. In this arrangement the absolute size of the pinhole aperture is unknown and cannot be directly measured, which affects the spatial resolution of the imaging system. Here we investigate the use of X-ray Lithography, Electroplating and Moulding (commonly known as LIGA) to fabricate high aspect ratio pinhole apertures in a gold screen of approximately 1 mm thickness.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB132
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THPVA030	Collective Effects Studies of the Double-Double Bend Achromat Cell at Diamond	4493
	E. Koukovini-Platia, R. Bartolini, L.M. Bobb, R.T. Fielder DLS, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	One cell of the Diamond storage ring has been converted from a double bend achromat to a double-double bend achromat (DDBA). After the successful installation and beam commissioning in November 2016, beam-based studies were done to assess the effect of the new cell on the single bunch and multi-bunch instabilities both in transverse and longitudinal planes. These are compared with the impedance estimate carried out both numerically and analytically.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA030
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Paper

Title

Page

Cherenkov Diffraction Radiation From Long Dielectric Material: An Intense Source of Photons in the NIR-THz Range

400

T. Lefèvre, M. Bergamaschi, O.R. Jones, R. Kieffer, S. Mazzoni
CERN, Geneva, Switzerland
M.G. Billing, J.V. Conway, J.P. Shanks
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
L.M. Bobb
DLS, Oxfordshire, United Kingdom
P. Karataev
Royal Holloway, University of London, Surrey, United Kingdom

This paper presents the design on the Cornell Electron Storage Ring (CESR) of an experimental set-up to meas-ure incoherent Diffraction Cherenkov Radiation (DChR) produced in a 2 cm long SiO2 radiator by a 2.1 GeV elec-tron beam. The electron beam is circulating at a distance of few mm from the edge of the radiator and the DChR photon output power is expected to be significantly higher than the diffraction radiation power emitted from a metal-lic slit of similar aperture. The radiator design and the detection set-up are presented in detail together with sim-ulations describing the expected properties of the emitted DChR in terms of light intensity and spectral bandwidth. Finally, potential applications of DChR are discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB118

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MOPAB132

Beam Size Measurement Using High Aspect Ratio LIGA Apertures in an X-Ray Pinhole Camera

445

L.M. Bobb, G. Rehm
DLS, Oxfordshire, United Kingdom

For optimal brilliance third generation light sources operate at a low emittance and low coupling. Commonly, transverse beam profile measurements are provided by direct imaging of the electron beam using X-ray pinhole cameras. From these beam size measurements and given knowledge of the lattice parameters the emittance, coupling and energy spread are calculated. Ideally, the pinhole aperture should be formed in an infinitely thin screen. However, due to the penetration of X-rays in the keV spectral range, stacked tungsten blades are often used to form the pinhole aperture. In this arrangement the absolute size of the pinhole aperture is unknown and cannot be directly measured, which affects the spatial resolution of the imaging system. Here we investigate the use of X-ray Lithography, Electroplating and Moulding (commonly known as LIGA) to fabricate high aspect ratio pinhole apertures in a gold screen of approximately 1 mm thickness.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB132

Export •

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

THPVA030

Collective Effects Studies of the Double-Double Bend Achromat Cell at Diamond

4493

E. Koukovini-Platia, R. Bartolini, L.M. Bobb, R.T. Fielder
DLS, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

One cell of the Diamond storage ring has been converted from a double bend achromat to a double-double bend achromat (DDBA). After the successful installation and beam commissioning in November 2016, beam-based studies were done to assess the effect of the new cell on the single bunch and multi-bunch instabilities both in transverse and longitudinal planes. These are compared with the impedance estimate carried out both numerically and analytically.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA030

Export •

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