| Paper | Title | Page |
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| WEPD44 | FEL Research and Development at STFC Daresbury Laboratory | 468 |
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| In this paper we present an overview of current and proposed FEL developments at STFC Daresbury Laboratory in the UK. We discuss progress on the ALICE IR-FEL since first lasing in October 2010, covering the optimisation of the FEL performance, progress on the demonstration of a single shot cross correlation experiment and the results obtained so far with a Scanning Near-Field Optical Microscopy beamline. We discuss a proposal for a 250 MeV single pass FEL test facility named CLARA to be built at Daresbury and dedicated to research for future light source applications. Finally we present a brief overview of other recent research highlights. | ||
| TUPD39 | Effect of Active Fibre Stabilization on Group and Phase Delay | 329 |
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An optical clock distribution system is being developed on the ALICE accelerator at Daresbury Laboratory. The system is based on a MLL fibre stabilization scheme* which delivers the clock signal with ultrashort optical pulses over an actively stabilized optical fibre. While these schemes stabilize the pulse transit time through fibre, they do not necessarily control the optical carrier. The ability to stabilize both the carrier and envelope phase in these systems could give higher resolution current envelope stabilized systems while continuing to deliver ultrashort pulses for use at delivery sites. We report here on a carrier phase detector to investigate the carrier-envelope phase walk-off in fibre distribution systems and how it is affected by active stabilization of the fibre. The phase monitor uses polarisation rotation associated with sub-wavelength delays in the fibre to detect changes in the carrier phase of ultrashort pulses. We present here studies of the carrier phase stability in an actively stabilized fibre link and its implications on the feasibility of stabilizing both carrier and envelope phase in pulsed synchronisation systems.
* S. Schulz et. al., Progress towards a permanent optical synchronization infrastructure at FLASH, Proc. of FEL 2009, Liverpool, UK, WEPC72 (2009). |
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| WEPD66 | Phase Space Manipulation with Laser-generated Terahertz Pulses | 523 |
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| Ultrafast lasers are able to generate THz pulses with >1MV/m field strengths, and with controllable electric field temporal profiles. We report on an experiment to demonstrate the use of laser generated THz pulses to manipulate the γ-z correlation of a ∼ 20MeV electron bunch on a sub picosecond time scale. The manipulation is achieved in free space, without external magnetic fields or undulators, by the interaction of the bunch with the longitudinal electric field of a co-propagating THz pulse in a TEM10*-like mode. We discuss the potential for arbitrary phase space control, including the possibility of correcting temporal jitter and driving electron beams into synchronisation with the laser. | ||