| Paper |
Title |
Page |
| MOPOR018 |
Single Bunch Instability Studies at Diamond Light Source |
637 |
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- E. Koukovini-Platia, M. Apollonio, R. Bartolini, R.T. Fielder, I.P.S. Martin
DLS, Oxfordshire, United Kingdom
- R. Bartolini
JAI, Oxford, United Kingdom
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Single bunch instability thresholds, the associated coherent tune shifts and the bunch lengthening have been studied at Diamond light source for nominal optics. Measurements were taken under different settings of chromaticity, radio-frequency (RF) voltage and aperture of the insertion devices (IDs). The macro-particle code sbtrack was used to evaluate the instability thresholds and bunch lengthening where different impedance contributions are taken into account such as the resistive wall impedance, a broad-band resonator model and inductive impedance for the longitudinal plane. A comparison of simulation using the developed model impedance with measurements is shown for all cases.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-MOPOR018
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| TUPOR012 |
THz Coherent Synchrotron Radiation from Ultra-low Alpha Operating Mode at Diamond Light Source |
1682 |
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- T. Chanwattana, M. Atay, R. Bartolini
JAI, Oxford, United Kingdom
- R. Bartolini, G. Cinque, M. Frogley, E. Koukovini-Platia, I.P.S. Martin
DLS, Oxfordshire, United Kingdom
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Diamond Light Source is regularly operated in low-alpha mode to provide THz coherent synchrotron radiation (CSR) and short X-ray pulses for users. In order to maintain the wide frequency range of the coherent radiation whilst improving the signal to noise ratio, an ultra-low alpha mode has been considered to shorten the bunch length even further. In order to study this mode, the analysis of single bunch dynamics resulting from a variety of wakefield sources has been investigated using a single bunch multiparticle tracking code. These results are compared with measurements recorded using a Fourier transform infrared (FTIR) interferometer on the MIRIAM beam-line at Diamond.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-TUPOR012
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| THPMR050 |
Studies to Install a Multipole Wiggler by Removing a Chromatic Sextupole in the Diamond Storage Ring |
3518 |
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- B. Singh, M. Apollonio, R. Bartolini, E. Koukovini-Platia, I.P.S. Martin, T. Pulampong, R.P. Walker
DLS, Oxfordshire, United Kingdom
- R. Bartolini
JAI, Oxford, United Kingdom
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Investigations are underway for the possible use of an achromat to install a short multipole wiggler by removing a chromatic sextupole in cell-11 of the storage ring. The effect on emittance and energy spread are found to be small, however the impact on lifetime and injection are very significant if the chromaticity is corrected normally (globally). The MOGA genetic algorithm is used to optimize the lifetime and injection efficiency in this case. We used local mirror chromatic sextupole and other chromatic sextupole family for chromaticity correction in which case the genetic algorithm found solution that restores lifetime and injection efficiency. In this paper the results of MOGA simulations using various schemes for chromaticity correction and test results in presently operational optics will be discussed.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-THPMR050
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