A. Zako et al., Simultaneous two-color lasing in the mid-IR and far-IR region with two undulators and one RF linac at the FELI, NUCL INST A, 429(1-3), 1999, pp. 136-140
Simultaneous two-color FEL lasing on the same electron macropulse has been
demonstrated at 4.65 and 19.4 mu m using a 33 MeV electron beam and two FEL
facilities (FEL-1 and FEL-4) of the FELI. The average powers are 11 mW at
4.65 mu m and 2 mW at 19.4 mu m. Their spectral widths (FWHM) are 0.85% and
1.06%. They are delivered to users through two evacuated optical pipes. FE
L-1 achieved lasing in the mid-infrared region with the undulator-1 (UND-1;
lambda(u) = 34 mm, K = 0.5-1.5, N-u = 34) in 1994 and FEL-4 achieved lasin
g at far-infrared region with the undulator-4 (UND-4; lambda(u) = 80 mm, K
= 1.26-3.37, N-u = 30) in 1996. UND-4 is installed at the downstream of the
UND-1 and an electron beam is transported through an S-type electron beam
transport line including two 45 degrees bending magnets. (C) 1999 Elsevier
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