IPAC2013 - List of Authors (Apollonio, M.)

Paper	Title	Page
MOPEA066	Investigation and Test of the Possibility of Reducing the Emittance of the Diamond Storage Ring	234
	B. Singh, M. Apollonio, R. Bartolini, E.C. Longhi Diamond, Oxfordshire, United Kingdom R. Bartolini, T. Pulampong JAI, Oxford, United Kingdom
	Theoretical and experimental studies have been carried out at the Diamond Light Source to assess the possibility of reducing the emittance of the existing storage ring by means of a change to the optics. The optics solutions obtained so far using a Multi Objective Genetic Algorithm (MOGA) increase the dispersion and the horizontal beta function in the straight section. While the emittance can be reduced to 2.1 nm this optics is limited by the operation of high field superconducting wiggler devices. In this report we present details of the new optics and present results of practical tests. We also compare the theoretical emittance growth due to a wiggler in a dispersive region with test results.

MOPEA071	Operating the Diamond Storage Ring with Reduced Vertical Emittance	249
	I.P.S. Martin, M.G. Abbott, M. Apollonio, R. Bartolini, D. Hickin Diamond, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	In a synchrotron radiation light source, a reduction in vertical emittance can potentially increase the source brightness, reduce the spot size for microfocus beam lines or increase the vertical transverse coherence of the photon beam. With this aim, the target vertical emittance for the Diamond storage ring has been recently reduced from 27pm.rad to 8pm.rad (0.3% coupling). In this paper we discuss the main impacts of this reduction, along with the steps that have been taken to stabilise the coupling at the new value.

WEPME054	Girder Alignment in the Diamond Storage Ring	3052
	M. Apollonio, R. Bartolini, W.J. Hoffman, A.J. Rose, A. Thomson Diamond, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	A model of the Diamond Storage Ring describing the misalignment of its 74 girders in terms of displacements and rotations is used to predict the orbit distortions and corrector magnet strengths needed for a zero orbit. Using the data from a survey we compare the effect of a pure magnet misalignment with the natural orbit of the machine. A test with a displaced girder meant to produce a reduction in corrector strength is introduced. Comparison with data obtained from the actual move of the girder is presented and discussed.

WEPME055	Investigation of Source Point Instabilities in Dipole Magnet Based Beamlines	3055
	M. Apollonio, R. Bartolini Diamond, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	At Diamond the source point in the second dipole of the Double Bend Achromats can vary due the lack of adjacent BPMs constraining angle and position of the electron beam at the dipole. We have implemented a code based on our AT model to predict the effects of a corrector strength change and compared our predictions to data both from a beamline and from our pinhole cameras. We discuss the possibility of interfacing the code to a ray tracing routine in order to infer beam spot changes in the downstream beamline and suggest a procedure to restore the original source point.

Paper

Title

Page

Investigation and Test of the Possibility of Reducing the Emittance of the Diamond Storage Ring

234

B. Singh, M. Apollonio, R. Bartolini, E.C. Longhi
Diamond, Oxfordshire, United Kingdom
R. Bartolini, T. Pulampong
JAI, Oxford, United Kingdom

Theoretical and experimental studies have been carried out at the Diamond Light Source to assess the possibility of reducing the emittance of the existing storage ring by means of a change to the optics. The optics solutions obtained so far using a Multi Objective Genetic Algorithm (MOGA) increase the dispersion and the horizontal beta function in the straight section. While the emittance can be reduced to 2.1 nm this optics is limited by the operation of high field superconducting wiggler devices. In this report we present details of the new optics and present results of practical tests. We also compare the theoretical emittance growth due to a wiggler in a dispersive region with test results.

MOPEA071

Operating the Diamond Storage Ring with Reduced Vertical Emittance

249

I.P.S. Martin, M.G. Abbott, M. Apollonio, R. Bartolini, D. Hickin
Diamond, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

In a synchrotron radiation light source, a reduction in vertical emittance can potentially increase the source brightness, reduce the spot size for microfocus beam lines or increase the vertical transverse coherence of the photon beam. With this aim, the target vertical emittance for the Diamond storage ring has been recently reduced from 27pm.rad to 8pm.rad (0.3% coupling). In this paper we discuss the main impacts of this reduction, along with the steps that have been taken to stabilise the coupling at the new value.

WEPME054

Girder Alignment in the Diamond Storage Ring

3052

M. Apollonio, R. Bartolini, W.J. Hoffman, A.J. Rose, A. Thomson
Diamond, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

A model of the Diamond Storage Ring describing the misalignment of its 74 girders in terms of displacements and rotations is used to predict the orbit distortions and corrector magnet strengths needed for a zero orbit. Using the data from a survey we compare the effect of a pure magnet misalignment with the natural orbit of the machine. A test with a displaced girder meant to produce a reduction in corrector strength is introduced. Comparison with data obtained from the actual move of the girder is presented and discussed.

WEPME055

Investigation of Source Point Instabilities in Dipole Magnet Based Beamlines

3055

M. Apollonio, R. Bartolini
Diamond, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

At Diamond the source point in the second dipole of the Double Bend Achromats can vary due the lack of adjacent BPMs constraining angle and position of the electron beam at the dipole. We have implemented a code based on our AT model to predict the effects of a corrector strength change and compared our predictions to data both from a beamline and from our pinhole cameras. We discuss the possibility of interfacing the code to a ray tracing routine in order to infer beam spot changes in the downstream beamline and suggest a procedure to restore the original source point.