skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Tunable Soft X-Ray Oscillators

Abstract

A concept for a tunable soft x-ray free electron laser (FEL) photon source is presented and studied numerically. The concept is based on echo-enabled harmonic generation (EEHG), wherein two modulator-chicane sections impose high harmonic structure with much greater efficacy as compared to conventional high harmonic FELs that use only one modulator-chicane section. The idea proposed here is to replace the external laser power sources in the EEHG modulators with FEL oscillators, and to combine the bunching of the beam with the production of radiation. Tunability is accomplished by adjusting the magnetic chicanes while the two oscillators remain at a fixed frequency. This scheme eliminates the need to develop coherent sources with the requisite power, pulse length, and stability requirements by exploiting the MHz bunch repetition rates of FEL continuous wave (CW) sources driven by superconducting (SC) linacs. We present time-dependent GINGER simulation results for an EEHG scheme with an oscillator modulator at 43 nm employing 50percent reflective dielectric mirrors and a second modulator employing an external, 215-nm drive laser. Peak output of order 300 MW is obtained at 2.7 nm, corresponding to the 80th harmonic of 215 nm. An alternative single-cavity echo-oscillator scheme based on a 13.4 nm oscillator ismore » investigated with time-independent simulations that a 180-MW peak power at final wavelength of 1.12 nm. Three alternate configurations that use separate bunches to produce the radiation for EEHG microbunching are also presented. Our results show that oscillator-based soft x-ray FELs driven by CWSC linacs are extremely attractive because of their potential to produce tunable radiation at high average power together with excellent longitudinal coherence and narrow spectral bandwidth.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Accelerator& Fusion Research Division
OSTI Identifier:
991744
Report Number(s):
LBNL-3967E
TRN: US1007556
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: 32nd International Free Electron Laser Conference FEL 2010, Malmo, Sweden, 23-27 August 2010
Country of Publication:
United States
Language:
English
Subject:
43; DIELECTRIC MATERIALS; FREE ELECTRON LASERS; HARMONIC GENERATION; HARMONICS; LASERS; LINEAR ACCELERATORS; MIRRORS; OSCILLATORS; PEAK LOAD; PHOTONS; PRODUCTION; RADIATIONS; SIMULATION; SPICES; STABILITY; WAVELENGTHS; Free-electron laser; coherent x-rays; oscillator; EEHG

Citation Formats

Wurtele, Jonathan, Gandhi, Punut, Gu, X-W, Fawley, William M, Reinsch, Matthia, Penn, Gregory, Kim, K-J, Lindberg, Ryan, and Zholents, Alexander. Tunable Soft X-Ray Oscillators. United States: N. p., 2010. Web.
Wurtele, Jonathan, Gandhi, Punut, Gu, X-W, Fawley, William M, Reinsch, Matthia, Penn, Gregory, Kim, K-J, Lindberg, Ryan, & Zholents, Alexander. Tunable Soft X-Ray Oscillators. United States.
Wurtele, Jonathan, Gandhi, Punut, Gu, X-W, Fawley, William M, Reinsch, Matthia, Penn, Gregory, Kim, K-J, Lindberg, Ryan, and Zholents, Alexander. Fri . "Tunable Soft X-Ray Oscillators". United States. doi:. https://www.osti.gov/servlets/purl/991744.
@article{osti_991744,
title = {Tunable Soft X-Ray Oscillators},
author = {Wurtele, Jonathan and Gandhi, Punut and Gu, X-W and Fawley, William M and Reinsch, Matthia and Penn, Gregory and Kim, K-J and Lindberg, Ryan and Zholents, Alexander},
abstractNote = {A concept for a tunable soft x-ray free electron laser (FEL) photon source is presented and studied numerically. The concept is based on echo-enabled harmonic generation (EEHG), wherein two modulator-chicane sections impose high harmonic structure with much greater efficacy as compared to conventional high harmonic FELs that use only one modulator-chicane section. The idea proposed here is to replace the external laser power sources in the EEHG modulators with FEL oscillators, and to combine the bunching of the beam with the production of radiation. Tunability is accomplished by adjusting the magnetic chicanes while the two oscillators remain at a fixed frequency. This scheme eliminates the need to develop coherent sources with the requisite power, pulse length, and stability requirements by exploiting the MHz bunch repetition rates of FEL continuous wave (CW) sources driven by superconducting (SC) linacs. We present time-dependent GINGER simulation results for an EEHG scheme with an oscillator modulator at 43 nm employing 50percent reflective dielectric mirrors and a second modulator employing an external, 215-nm drive laser. Peak output of order 300 MW is obtained at 2.7 nm, corresponding to the 80th harmonic of 215 nm. An alternative single-cavity echo-oscillator scheme based on a 13.4 nm oscillator is investigated with time-independent simulations that a 180-MW peak power at final wavelength of 1.12 nm. Three alternate configurations that use separate bunches to produce the radiation for EEHG microbunching are also presented. Our results show that oscillator-based soft x-ray FELs driven by CWSC linacs are extremely attractive because of their potential to produce tunable radiation at high average power together with excellent longitudinal coherence and narrow spectral bandwidth.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Sep 17 00:00:00 EDT 2010},
month = {Fri Sep 17 00:00:00 EDT 2010}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: