| Paper |
Title |
Page |
| MOPCH054 |
Plans for the Generation of Short Radiation Pulses at the Diamond Storage Ring
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160 |
| |
- R. Bartolini
Diamond, Oxfordshire
- M. Borland, K.C. Harkay
ANL, Argonne, Illinois
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Diamond is a third generation light source under commissioning in Oxfordshire UK. In view of the increasing interest in the production of short radiation pulses, we have investigated the possibility to operate with a low-alpha optics, the use of a third harmonic cavity for bunch shortening and the implementation of a crab cavity scheme in the Diamond storage ring. The results of the initial accelerator studies will be described, including the modification of the beam optics, non-linear beam dynamics optimisation and choice of RF parameters for the crab cavity operation. The expected performance of these schemes will be summarised.
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| TUPCH044 |
Turn-by-turn Data Acquisition and Post-processing for the Diamond Booster and Storage Ring
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1103 |
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- R. Bartolini, M.G. Abbott, I.P.S. Martin, G. Rehm, J.H. Rowland
Diamond, Oxfordshire
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The Diamond booster and storage ring are equipped with Libera Electron Beam Position Processors with turn-by-turn capabilities. We describe here the turn-by-turn data acquisition system and the software used for post-processing the beam data. The signals from the Libera boxes are acquired and controlled with EPICS and then transferred to the MATLAB environment via the MATLAB Channel Access. Here they are post-processed using MATLAB capabilities and dedicated software linked to MATLAB. Examples of data acquired and measurements performed during Diamond booster and storage ring commissioning are reported.
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| WEPCH074 |
Progress with Non-linear Beam Dynamic Studies of the Diamond Storage Ring
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2089 |
| |
- R. Bartolini, I.P.S. Martin, B. Singh
Diamond, Oxfordshire
- J.K. Jones
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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The conflicting requirements of high-brightness photon beams combined with adequate beam lifetime and high injection efficiency mean careful control of the non-linear lattice is crucial to achieving optimum performance. As part of the optimisation of the Diamond storage ring, studies have been made of both the Touschek lifetime and storage ring injection process, with the help of on-momentum and off-momentum frequency maps. The effect of chromaticity on Touschek lifetime has also been investigated and several new sextupole settings were identified achieving good Touschek lifetime and injection efficiency.
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| WEPCH075 |
Effect of Insertion Devices on Beam Dynamics of the Diamond Storage Ring Using Kick Maps
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2092 |
| |
- B. Singh, A.I. Baldwin, R. Bartolini, I.P.S. Martin
Diamond, Oxfordshire
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The effect of the all Phase-I Insertion Devices (IDs) on the beam dynamic of the Diamond storage ring has been investigated using the kick map modelisation of the IDs. Kick maps have been produced with high accuracy using the computer code RADIA, considering many longitudinal harmonics. The effect of IDs on the dynamic aperture, Touschek lifetime and injection efficiency in the low emittance lattice, was investigated considering both coupling errors and physical engineering apertures. Harmful resonances have been identified using Frequency Map Analysis (FMA) and full 6D tracking was performed to estimate the Touschek lifetime and the injection efficiency. Additionally, the kick maps have been used to generate feed-forward tables for compensation of linear optics distortion.
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| WEPCH141 |
Accelerator Physics Code Web Repository
|
2254 |
| |
- F. Zimmermann, R. Basset, E. Benedetto, U. Dorda, M. Giovannozzi, Y. Papaphilippou, T. Pieloni, F. Ruggiero, G. Rumolo, F. Schmidt, E. Todesco
CERN, Geneva
- D.T. Abell
Tech-X, Boulder, Colorado
- R. Bartolini
Diamond, Oxfordshire
- O. Boine-Frankenheim, G. Franchetti, I. Hofmann
GSI, Darmstadt
- Y. Cai, M.T.F. Pivi
SLAC, Menlo Park, California
- Y.H. Chin, K. Ohmi, K. Oide
KEK, Ibaraki
- S.M. Cousineau, V.V. Danilov, J.A. Holmes, A.P. Shishlo
ORNL, Oak Ridge, Tennessee
- L. Farvacque
ESRF, Grenoble
- A. Friedman
LLNL, Livermore, California
- M.A. Furman, D.P. Grote, J. Qiang, G.L. Sabbi, P.A. Seidl, J.-L. Vay
LBNL, Berkeley, California
- D. Kaltchev
TRIUMF, Vancouver
- T.C. Katsouleas
USC, Los Angeles, California
- E.-S. Kim
PAL, Pohang, Kyungbuk
- S. Machida
CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
- J. Payet
CEA, Gif-sur-Yvette
- T. Sen
Fermilab, Batavia, Illinois
- J. Wei
BNL, Upton, Long Island, New York
- B. Zotter
Honorary CERN Staff Member, Grand-Saconnex
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In the framework of the CARE HHH European Network, we have developed a web-based dynamic accelerator-physics code repository. We describe the design, structure and contents of this web repository, illustrate its usage, and discuss our future plans.
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| THPCH042 |
Numerical Estimations of Wakefields and Impedances for Diamond Collimators
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2877 |
| |
- S.A. Pande, R. Bartolini, R. T. Fielder, M. Jensen
Diamond, Oxfordshire
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The storage ring of the Diamond light source will use two collimators, one in horizontal and one in the vertical planes in the injection straight to protect the IDs from the injection and Touschek losses. These collimators, in the form of tapered metallic intrusions in to the vacuum chamber, will generate considerable wake fields and will contribute to the overall machine impedance. In this paper we present the results of ABCI and MAFIA numerical simulations to estimate these effects.
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| THPCH066 |
Transient Beam Loading in the DIAMOND Storage Ring
|
2937 |
| |
- S. De Santis, J.M. Byrd
LBNL, Berkeley, California
- R. Bartolini
Diamond, Oxfordshire
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Harmonic cavity systems have been installed on several 3rd generation light sources to lengthen the bunches and increase the Touschek lifetime. Apart from this beneficial effect, harmonic cavities are known to increase the transient beam loading in high-current machines, due to the presence of gaps in the fill pattern. The amplitude of this effect, which is substantially larger than that caused by the main RF system, can in turn produce considerable variations in bunch length and phase along the train, which result in a significant reduction of the lifetime increase. We have developed a tracking simulation, which we have applied to the analysis of the beam loading transients in Diamond, for the case of passive superconducting harmonic cavities. The influence of beam current, gap amplitude and harmonic cavity tuning on the final lifetime have been studied, as well as the effects of higher-order modes.
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| THPCH112 |
High-level Software for Diamond Commissioning and Operation
|
3065 |
| |
- R. Bartolini, C. Christou, I.P.S. Martin, J.H. Rowland, B. Singh
Diamond, Oxfordshire
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The Diamond accelerator complex is controlled with EPICS. While generic applications are provided by the EPICS toolkit, accelerator physics application for the commissioning and operation of the Diamond booster, storage ring and transfer line are mainly developed with MATLAB. The MATLAB Middle Layer tools developed at ALS and SPEAR3 have been extensively used and extended with many new applications. Experience using these tools during the commissioning of the Diamond booster, transfer lines and storage ring are reported.
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| THPLS029 |
Commissioning of the Booster Synchrotron for the Diamond Light Source
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3344 |
| |
- V.C. Kempson, R. Bartolini, C. Christou, J.A. Dobbing, G.M.A. Duller, M.T. Heron, I.P.S. Martin, G. Rehm, J.H. Rowland, B. Singh
Diamond, Oxfordshire
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The Diamond booster is a 158 m circumference, 5 Hz synchrotron which accelerates the 100 MeV electron beam from a linac to 3 GeV for full-energy injection into the Diamond storage ring. The booster has been commissioned in the first few months of 2006, following successful initial 100 MeV trials at the very end of 2005. The injection and ramping process, orbit correction and essential beam physics measurements are discussed as are extraction and beam transport to the storage ring.
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| THPLS030 |
Beam Optic Measurements for the Booster Synchrotron of the Diamond Light Source
|
3347 |
| |
- B. Singh, R. Bartolini, C. Christou, V.C. Kempson, I.P.S. Martin
Diamond, Oxfordshire
- J.K. Jones
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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The booster synchrotron of the Diamond Light Source is a full energy injector ramping from 100 MeV to 3 GeV with a repetition rate of 5 Hz. As part of the booster commissioning, beam optic measurements were performed to characterize the booster performance. Through the use of the beam position monitors, orbit corrections, tune and chromaticity measurements were performed at injection energy and during the ramp. A first comparison with the booster model is also discussed.
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