Single shot 3 GeV electron transverse emittance with a pepper-pot
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 729 (2013) 554-556
C Thomas, R Bartolini, N Delerue
We present the first measurement of the transverse emittance of an electron bunch at 3 GeV using the pepper-pot technique. The measurements presented in this paper demonstrate the possibility to use such a method for single shot emittance measurement of high energy particles. This measurement presents also the experimental verification of a previous theoretical study, which was predicting in which condition such a measurement can be done. The method may present some technical limitations which are discussed in view of the application to future very small emittance multi-GeV particle accelerators. © 2013 Elsevier B.V.
The conceptual design of clara, a novel fel test facility for ultrashort pulse generation
IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference (2013) 1265-1267
JA Clarke, D Angal-Kalinin, N Bliss, R Buckley, S Buckle, R Cash, P Corlett, L Cowie, G Cox, GP Diakun, DJ Dunning, BD Fell, A Gallagher, P Goudket, AR Goulden, DMP Holland, SP Jamison, JK Jones, AS Kalinin, BPM Liggins, L Ma, KB Marinov, B Martlew, PA McIntosh, JW McKenzie, KJ Middleman, BL Militsyn et al…
The conceptual design of CLARA, a novel FEL test facility focussed on the generation of ultra-short photon pulses with extreme levels of stability and synchronisation is described. The ultimate aim of CLARA is to experimentally demonstrate that sub-coherence length pulse generation with FELs is viable, and to compare the various schemes being championed. 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. Copyright © 2013 by JACoW.
Ultra-low emittance upgrade options for third generation light sources
IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference (2013) 237-239
R Bartolini, T Pulampong
The increasing efforts in the synchrotron light sources community toward the design of a diffraction limited source at multi-keV photon energy have eventually stimulated the existing facilities to investigate possible upgrade paths to higher photon brightness and lower emittances to maintain their competitiveness within the users' community. We present a possible option for upgrading 3rd generation light sources based on a rebuild of the arcs with MBA cells, using diamond as an example. Emphasis is given to the AP design issues with a view to minimal changes to the machine layout, contained cost and minimal downtime. Copyright © 2013 by JACoW.
Tuning of the injector system to match possible lattice upgrades at diamond light source
IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference (2013) 243-245
C Christou, R Bartolini, J Kay
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 . 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. Copyright © 2013 by JACoW.
Spectra of coherent smith-purcell radiation observed from short electron bunches: Numerical and experimental studies
IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference (2013) 801-803
FB Taheri, IV Konoplev, G Doucas, A Reichold, R Bartolini, RJDA Smith, N Delerue, H Andrews, N Fuster-Martínez, C Clarke, V Bharadwaj, PH Stoltz
To stimulate and support the progress in areas of compact particle accelerators, within research fields including X-ray and THz (T-ray) sources of radiation, 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. We use a PiC numerical model to analyse the dependence of radiated spectra dependence on the electron bunch profile, and discuss our results in the context of new experimental data from the E203 experiment at SLAC. Copyright © 2013 by JACoW.
Operating the diamond storage ring with reduced vertical emittance
IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference (2013) 249-251
IPS Martin, MG Abbott, M Apollonio, D Hickin, R Bartolini
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 27 pm.rad to 8 pm.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. Copyright © 2013 by JACoW.
Operating the diamond light source in lowalpha mode for users
IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference (2013) 246-248
IPS Martin, G Cinque, G Rehm, CA Thomas, R Bartolini
Since its first introduction in April 2009, the low alpha operational mode has been continually refined in order to best meet the needs of the user community. Initially the lattice was used only to generate short x-ray pulses, for which a stable, low emittance, single bunch was requested, with the emphasis placed on increased bunch charge over shortest absolute pulse duration. More recently, the lattice has been adapted to enhance the CSR gain in the THz region of the electromagnetic spectrum. In this paper we summarise the work carried out in order to meet these two demands. Copyright © 2013 by JACoW.