| Paper |
Title |
Page |
| TUPP020 |
Analysis of Collective Effects at the Diamond Storage Ring
|
1574 |
| |
- R. Bartolini, C. Christou, R. T. Fielder, M. Jensen, A. F.D. Morgan, S. A. Pande, G. Rehm, C. A. Thomas
Diamond, Oxfordshire
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The Diamond storage ring has achieved its nominal operating current of 300 mA in multi-bunch mode and up to 10 mA in single bunch mode. Several collective instabilities have been observed and their dependence on machine parameters such as chromaticities, RF voltage and fill pattern have been investigated. We report here the analysis of the observed current thresholds and rise times of the instabilities compared with analytical estimates and tracking simulations. We also present the results of the MAFIA simulations performed with the aim of understanding the main contribution to the impedance of the ring and establishing a machine impedance database.
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| TUPP058 |
Impedance Estimation of Diamond Cavities
|
1673 |
| |
- S. A. Pande, R. T. Fielder, M. Jensen
Diamond, Oxfordshire
- R. Bartolini
JAI, Oxford
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| |
The RF straight section of the Diamond storage ring presently consist of two CESR type SCRF cavities with a provision to install a third cavity in the future. The cavities are equipped with HOM loads and are joined to the adjacent storage ring beam pipe using tapered transitions. The RF cavities are simulated with MAFIA, CST Studio and ABCI to estimate their contribution to the total ring impedance. We also measured the resonant frequencies and Q factors of residual HOMs in these cavities. In this paper, we present the results of our measurements and simulations which lead us to an estimation of the impedance of the RF straight.
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| WEPC119 |
First Year's Experience of Diamond Insertion Devices
|
2285 |
| |
- E. C. Longhi, R. T. Fielder, I. P.S. Martin, J. C. Schouten, B. Singh
Diamond, Oxfordshire
- R. Bartolini
JAI, Oxford
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| |
Diamond was commissioned at 3GeV with seven insertion devices (IDs) already installed. The phase 1 IDs include five in-vacuum permanent magnet undulators, an APPLE–2 variable polarization device, and a superconducting wiggler. Since initial commissioning of the ring, three more in-vacuum undulators have been installed, and another three devices will be installed in the coming year. In this paper, we describe commissioning, characterizing, and operating with these IDs.
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| THPC025 |
Further Advances in Understanding and Optimising Beam Dynamics in the Diamond Storage Ring
|
3032 |
| |
- I. P.S. Martin, R. T. Fielder, E. C. Longhi, B. Singh
Diamond, Oxfordshire
- R. Bartolini
JAI, Oxford
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| |
We report the results of recent beam dynamics studies of the Diamond storage ring. These studies were aimed at both improving our understanding of the machine operation as well as establishing a reliable, well corrected lattice with long lifetime and high injection efficiency suitable for later top-up operation. Particular attention has been given to measuring and controlling the linear optics of the lattice, to determining the various contributions to the overall beam lifetime and to optimising the sextupole strengths for good on and off momentum dynamic aperture. For each topic, detailed comparisons with model predictions are also described.
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