| Paper |
Title |
Page |
| MOPPH011 |
FELO: A One-Dimensional Time-Dependent FEL Oscillator Code
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59 |
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- B. W.J. McNeil, G. R.M. Robb
USTRAT/SUPA, Glasgow
- D. J. Dunning, N. Thompson
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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A one-dimensional, SDDS compliant time-dependent FEL oscillator code has been developed in Fortran 90. The code, FELO, solves universally-scaled FEL equations to simulate oscillator FELs operating from the low to high gain regime. The code can simulate start-up from shot noise, different electron pulse current distributions, the effects of cavity length detuning and temporal jitter between electron bunches. Cavity detuning curves for both the low-gain IR-FEL and the regenerative amplifier VUV-FEL of the 4th Generation Light Source (4GLS) proposal at Daresbury Laboratory are modelled. The code predictions for the VUV-FEL output are compared with simulations performed with the parallel implementation of Genesis 1.3 and are found to be in good agreement.
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| MOPPH012 |
The Conceptual Design of the 4GLS XUV-FEL
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63 |
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- B. W.J. McNeil
USTRAT/SUPA, Glasgow
- B. Sheehy
Sheehy Scientific Consulting, Wading River, New York
- N. Thompson
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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The Conceptual Design Report for the 4th Generation Light Source (4GLS) at Daresbury Laboratory in the UK was published in Spring 2006. A key component of the proposal is an XUV-FEL amplifier directly seeded by a High Harmonic source and operating in the photon energy range 8-100eV. Numerical modelling shows the FEL may generate ~50fs (FWHM) pulses of variably-polarised, temporally-coherent radiation with peak powers in the range 2-8 GW.
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| MOPPH067 |
Issues in High Harmonic Seeding of the 4GLS XUV-FEL
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198 |
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- B. Sheehy
Sheehy Scientific Consulting, Wading River, New York
- J. A. Clarke, D. J. Dunning, N. Thompson
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- B. W.J. McNeil
USTRAT/SUPA, Glasgow
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Using High Harmonics (HH) as a seed for free electron lasers is currently under consideration in a number of proposed facilities. An HH seed source is independent of machine dynamics, and allows for extensive manipulation of the seed pulse using well-established techniques of ultrafast laser physics. These allow for rapid tuning, and may enable the extension of chirped pulse amplification and even pulse shaping for coherent control to short wavelengths. In addition, there are advantages in terms of noise and synchronization. There are a number of issues involved in the implementation of HH seeding: energy, tunability, coherence, temporal structure, etc. We discuss these issues and their application in the 4GLS XUV-FEL
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| MOCAU03 |
The Use of HHG at 4GLS
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234 |
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- B. W.J. McNeil
USTRAT/SUPA, Glasgow
- D. J. Dunning, N. Thompson
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- B. Sheehy
Sheehy Scientific Consulting, Wading River, New York
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4GLS is a facility proposed for the Daresbury Laboratory in the UK* which will offer users a suite of high brightness synchronised sources from THz frequencies into the XUV. In the current design, photon energies from 8-100eV will be generated in a variable polarisation FEL amplifier directly seeded by a High Harmonic Gain system. The reasoning behind this choice will be discussed and characterisation of the sources based on the present design presented.
*http://www.4gls.ac.uk/documents.htm#CDR
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Slides
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Talk
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| TUPPH001 |
A 3D Model of the 4GLS VUV-FEL Conceptual Design Including Improved Modelling of the Optical Cavity
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304 |
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- N. Thompson, D. J. Dunning
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- K.-J. Boller, J. G. Karssenberg, P. J.M. van der Slot
Twente University, Laser Physics and Non-Linear Optics Group, Enschede
- B. W.J. McNeil
USTRAT/SUPA, Glasgow
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The Conceptual Design Report for the 4th Generation Light Source (4GLS) at Daresbury Laboratory in the UK was published in Spring 2006. The proposal includes a low-Q cavity (also called a regenerative amplifier) FEL to generate variably-polarised, temporally-coherent radiation in the photon energy range 3-10eV. A new simulation code has been developed that incorporates the 3D FEL code Genesis 1.3 and which simulates in 3D the optical components and radiation propagation within the non-amplifying sections of an optical cavity*. This code is used to estimate the optimum low-Q cavity design and characterise the output from the 4GLS VUV-FEL.
* J. G. Karstenberg, P. J.M. van der Slot, J. W.J. Verschuur, I. V. Volohkin, K.-J. Boller (ibid)
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| TUPPH057 |
First Tolerance Studies for the 4GLS FEL Sources
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462 |
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- D. J. Dunning, J. A. Clarke, D. J. Scott, N. Thompson
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- B. W.J. McNeil
USTRAT/SUPA, Glasgow
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The Conceptual Design Report for the 4th Generation Light Source (4GLS) at Daresbury Laboratory in the UK was published in Spring 2006. 4GLS features three distinct FEL designs, each operating in a different wavelength range: an externally seeded amplifier operating in the photon energy range 8-100eV (XUV-FEL); a low-Q cavity (regenerative amplifier) FEL operating over 3-10eV (VUV-FEL); a high-Q cavity FEL operating from 2.5-200μm (IR-FEL). Preliminary results of tolerance studies for the FELs designs are presented. In particular, the effects of the relative timing offset between the seed pulse of the XUV-FEL and the electron bunch, as well as the effects of electron bunch timing jitter in the VUV-FEL, are presented.
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