| Paper | Title | Page |
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| MOPPH042 | FEL Scheme with Optical Cavity Round-Trip Frequency at Multiple of Electron Bunch Repetition Rate | 75 |
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A study is carried out to develop an optimised scheme for a free electron laser operating in the far-infrared, based upon an electron beam delivered from a prototype superconducting linac module*. This collaboratively developed module is capable of delivering 123 pC of bunch charge at a repetition rate of 13 MHz, or alternatively, higher bunch charges are achievable at lower repetition rates (200 pC at 4.33 MHz for example). A conventional oscillator-type FEL design is compared with a proposed alternative design; wherein the radiation makes three passes of the optical cavity per electron bunch arrival. For both schemes, the output photon properties are predicted through simulations using Genesis 1.3 in combination with the optics code OPC, and tolerances to mirror alignment are investigated and compared to predictions from theory. The further potential of schemes where the radiation makes multiple passes of the optical cavity per electron bunch arrival is discussed.
*P. A. McIntosh et al, “Development of a Prototype Superconducting CW Cavity and Cryomodule for Energy Recovery”, EPAC’06, Edinburgh, June 2006, pp. 436 – 438. |
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| MOCAU04 | Retention of Attosecond Pulse Structure in an HHG Seeded FEL Amplifier | 177 |
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| A model is presented which demonstrates that the attosecond pulse structure of an HHG seed may be retained through to saturation in an FEL amplifier. At wavelengths of ~12nm, a train of attosecond pulses of widths ~300 attoseconds with peak powers in excess of 1GW are predicted from full 3D simulation. Methods for improving these results are discussed. |