CERN Accelerating science

Article
Title	Seeding High Gain Harmonic Generation with Laser Harmonics produced in Gases
Author(s)	Lambert, Guillaume ; Carré, Bertrand ; Couprie, Marie Emmanuelle ; Garzella, David ; Doria, Andrea ; Giannessi, Luca ; Hara, Toru ; Kitamura, Hideo ; Shintake, Tsumoru
Affiliation	(CEA/Saclay, Gif-sur-Yvette) ; (ENEA C.R. Frascati, Frascati (Roma) ; (RIKEN Spring-8 Harima, Hyogo)
Publication	2004
Number of pages	3
In:	9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.363
In:	26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. MOPOS21
Subject category	Accelerators and Storage Rings
Free keywords	electron ; simulation ; undulator
Abstract	Free electron Lasers employing High Gain Harmonic generation (HGHG) schemes are very promising coherent ligth sources for the soft X-ray regime. They offer both transverse and longitudinal coherence, while Self Amplified Spontaneous Emission schemes have a longitudinal coherence limited. We propose here to seed HGHG with high harmonics produced by a Ti:Sa femtosecond laser focused on a gas jet, tuneable in the 100-10 nm spectral region. Specifities concerning the implementation of this particular laser source as a seed for HGHG are investigated. Semi analytical , numerical 1D and 3D calculations are given, for the cases of the SCSS, SPARC and ARC-EN-CIEL projects.

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