NONE-No attached Diamond beamline
Accelerator Physics
Diagnostics
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F.
Bakkali Taheri
,
I. V.
Konoplev
,
G.
Doucas
,
A.
Reichold
,
R. J. D. A.
Smith
,
R.
Bartolini
,
N.
Delerue
,
H.
Andrews,
,
N.
Fuster-Martínez
,
C.
Clarke
,
V.
Bharadwaj
,
P. H.
Stoltz
Abstract: There is a significant interest in the development of compact particle accelerators within research areas including X-ray and THz (T-ray) sources of radiation, particle physics and medical sciences. To support the progress in these areas, non-invasive, electron beam diagnostics that are capable of measuring a single femtosecond electron bunch are required. At the current stage such beam diagnostics for femtosecond-long electron bunches are still not available. The goal of the work presented is to understand the spectral characteristics of coherent Smith-Purcell radiation to enable its quick and reliable interpretation including the longitudinal profile reconstruction of electron bunches. The research presented comprises results from numerical modelling and experimental studies. Using the numerical data, we discuss the radiated spectra dependence on the electron bunch profile and analyse the results. We also discuss the experimental data and compare it with theoretical predictions.
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May 2013
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NONE-No attached Diamond beamline
Accelerator Physics
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S.
Spampinati
,
D.
Angal-Kalinin
,
A. D.
Brynes
,
D
Dunning
,
J. K.
Jones
,
K.
Marinov
,
J. W.
Mckenzie
,
B. L.
Militsyn
,
N. R.
Thompson
,
P. H.
Williams
,
I. P.
Martin
Abstract: We present recent developments in the accelerator design of CLARA (Compact Linear Accelerator for Research and Applications), the proposed UK FEL test facility at Daresbury Laboratory. The layout changes include a dedicated collimator in CLARA front end to provide some control over the dark current, changes to low energy diagnostics section and modifications to FEL modules. The progress in the design simulations mainly focus on injector simulations incorporating wake fields in ASTRA, comparison of using ELEGANT and CSRTRACK for the Variable Bunch Compressor and first considerations of requirement of laser heater for CLARA.
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May 2014
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NONE-No attached Diamond beamline
Accelerator Physics
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Abstract: Ultra-low emittance lattices will operate with reduced dynamics apertures. New injection schemes are currently investigated in order to guarantee sufficient injection efficiency. A promising candidate is a pulsed kicker with a nonlinear magnetic field. The studies presented in this paper prove that this kicker allows injection with reduced dynamic aperture and provide minimal perturbation of the stored beam during Top-Up injection. Plans to install such a device at the Diamond light source are outlined.
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May 2013
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NONE-No attached Diamond beamline
Accelerator Physics
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Abstract: Diamond Light Source is investigating the possibility of increasing the storage ring operating current above the nominal 300 mA. A campaign of measurements and simulations has been carried out in order to understand the extent of the parasitic energy loss and characterise the most important items which build up the machine impedance. In this paper we report on the most recent measurements of the longitudinal loss factor and the present status of the impedance database with an initial comparison between the two.
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May 2013
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NONE-No attached Diamond beamline
Accelerator Physics
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J.
Clarke
,
D.
Angal-Kalinin
,
N.
Bliss
,
R.
Buckley
,
S.
Buckley
,
R.
Cash
,
P.
Corlett
,
L.
Cowie
,
G.
Cox
,
G. P.
Diakun
,
D. J.
Dunning
,
B. D.
Fell
,
A.
Gallagher
,
P.
Goudket
,
A. R.
Goulden
,
D. M. P.
Holland
,
S. P.
Jamison
,
J. K.
Jones
,
A. S.
Kalinin
,
B. P. M.
Liggins
,
L.
Ma
,
K. B.
Marinov
,
B.
Martlew
,
P. A.
Mcintosh
,
J. W.
Mckenzie
,
K. J.
Middlemen
,
B. L.
Militsyn
,
A. J.
Moss
,
B. D.
Muratori
,
M. D.
Roper
,
R.
Santer
,
Y.
Saveliev
,
E.
Snedden
,
R. J.
Smith
,
S. L.
Smith
,
M.
Surman
,
T.
Thakker
,
N. R.
Thompson
,
R.
Valizadeh
,
A. E.
Wheelhouse
,
P. H.
Williams
,
R.
Bartolini
,
I.
Martin
,
R.
Barlow
,
A.
Kolano
,
G.
Burt
,
S.
Chattopadhyay
,
D.
Newton
,
A.
Wolski
,
R. B.
Appleby
,
H. L.
Owen
,
M.
Serluca
,
G.
Xia
,
S.
Boogert
,
A.
Lyapin
,
L.
Campbell
,
B. W. J.
Mcneil
,
V. V.
Paramonov
Abstract: The conceptual design of CLARA, a novel FEL test facility focussed on the generation of ultrashort photon pulses with extreme levels of stability and synchronisation is described. The ultimate aim of CLARA is to experimentally demonstrate, for the first time, that sub-coherence length pulse generation with FELs is viable. The results will translate directly to existing and future X-Ray FELs, enabling them to generate attosecond pulses, thereby extending the science capabilities of these intense light sources. This paper will describe the design of CLARA, pointing out the flexible features that will be incorporated to allow multiple novel FEL schemes to be proven.
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May 2013
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I12-JEEP: Joint Engineering, Environmental and Processing
NONE-No attached Diamond beamline
Optics
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Abstract: Finite-element analysis is frequently used by engineers at synchrotron beamlines to calculate the elastic deformation of a single crystal undergoing mechanical bending or thermal load. ANSYS® Workbench™ software is widely used for such simulations. However, although ANSYS® Workbench™ software provides useful information on the displacements, strains and stresses within the crystal, it does not yield the local reciprocal lattice vectors that would be required for X-ray diffraction calculations. To bridge this gap, a method based on the shape functions and interpolation procedures of the software itself has been developed. An application to the double-crystal bent Laue monochromator being designed for the I12 (JEEP) wiggler beamline at the Diamond Light Source is presented
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Nov 2008
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NONE-No attached Diamond beamline
Insertion Devices
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Open Access
Abstract: Starting from the concepts of the Hybrid Multi Bend Achromat (HMBA) lattice developed at ESRF and of the Double-Double Bend Achromat (DDBA) lattice developed at Diamond, we present a new cell that includes all the advantages of the two designs. The resulting Double Triple Bend Achromat (DTBA) cell allows for a natural horizontal emittance of less than 100 pm with a large dynamic aperture and lifetime. It includes two straight sections, for insertion devices, five and three meters long. The lattice is consistent with the engineering design developed for the ESRF-EBS lattice and the layout and user requirements of Diamond. The characteristics of the cell are presented together with the results of the optimisation process.
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Jun 2016
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NONE-No attached Diamond beamline
Insertion Devices
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Abstract: Many synchrotron radiation facilities are studying lattice upgrades in order to lower the natural emittance and hence increase the radiation brightness. At Diamond we are pursuing a novel alternative, not targeting the minimum possible emittance but instead introducing additional insertion device (ID) straights and hence increasing the capacity of the facility, while still possibly achieving a more limited reduction in emittance. The new scheme involves converting some of the DBA lattice cells into a double-DBA or DDBA, with a new ID straight between the two achromats. This then allows existing or future bending magnet ports (which in Diamond are taken from near the entrance to the second dipole of the DBA lattice) to be served by a much more powerful insertion device. We present here the design concept and preliminary lattice design, and discuss the challenging magnet, vacuum and engineering issues.
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May 2013
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NONE-No attached Diamond beamline
Insertion Devices
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Abstract: Studies of novel lattice upgrades for Diamond Light Source to achieve an increase in the number of insertion devices and/or a lower natural emittance are underway (as reported elsewhere at this conference). Such upgrades if carried out progressively would result in successive reductions in storage ring circumference. To maintain synchronous injection then requires the injector system to operate at various frequencies to match these changes. This paper describes the tests carried out with beam, to prove that the injector system of Linac and full energy Booster can be tuned over an extended frequency range.
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May 2013
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NONE-No attached Diamond beamline
Insertion Devices
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Abstract: Diamond plans to operate a 5 m, long period length, APPLE undulator in a long insertion straight section. Theoretical investigations showed a severe impact on machine dynamics especially when the device is operated in vertical polarization mode. The use of local optics corrections and/or lowering of beta functions were initially investigated as possible solutions but with limited success. Active shimming of dynamic multipoles, following the approach at BESSY-II, proved more effective. The optimum shiming has been devised using kick map approach. In this paper we review the theoretical analysis, the commissioning of the active shims and the undulator, and the net effect of the undulator after compensation.
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May 2013
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