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Progress of the European FEL Project at ELETTRA
(last updated April 9th, 2001)
April 6th-7th 2001: FEL Run #22 (1 shift)
- re-alignment of the ‘switching mirror’ (downstream of the front cavity
mirror) after installation
of the Nanospectroscopy beamline mirror, and re-establishing lasing
at 195 nm.
March 10th-13th 2001: FEL Run #21 (5 shifts)
- lasing at 220 nm: spectral and temporal profile measurements as a
function of cavity length detuning
- lasing at 193 nm: tuning range was 192-200 nm; at 191.7 nm measured
spectral width
of 2.8 10-4 (FWHM) and pulse length of 7.7 ps (FWHM); first SPE-LEEM
microscope image
taken with 194 nm radiation.
February 17th 2001: FEL Run #20 (1 shift)
- alignment studies
February 4th and 6th 2001; FEL Run #19 (2.5 shifts)
- first two shifts: after positioning of the front mirror, work was
interrupted due to a blockage
of the back mirror mechanism; shift continued with electron beam studies
in FEL mode
- after un-blocking the mirror mechanism an extra half-shift was given
to FEL work; lasing soon
obtained initially at 193 nm (02:48); shortest wavelength reached
was 189.7 nm; tuned over the
range 189.7 – 200.3; minimum linewidth (FWHM) 3 10-4; measured power
8 mW (25 mA);
laser still on at 193 nm with 11 mA in ring when beam had to be killed
(03:38).
January 13th 2001: FEL Run #18 (1 shift)
- due to a problem with the back mirror mechanism the shift was dedicated
to a re-alignment
of the front axis, following the re-poitioning of the ‘switching mirror’
during the previous shutdown
December 12th-13th 2000: FEL Run #17 (1 shift)
- lasing at 220 nm
December 1st-2nd 2000: FEL Run #16 (2 shifts)
- test of new software for automatic tune compensation during undulator
gap and phase changes
- testing of SPE-LEEM microscope with FEL light at 220 and 250 nm
November 16th-17th 2000: FEL Run #15 (2 shifts)
- lasing at 250 nm with high transmission mirrors; max. power reliably
measured 180 mW.
October 29th-30th 2000: FEL Run #14 (3 shifts)
- lasing at 250 nm, detailed investigation of detuning curve and macropulse
structure
- installation of high transmission mirrors; power of at least 100
mW recorded
- first SPE-LEEM image taken with FEL light
October 15th-16th 2000: FEL Run #13 (2 shifts)
- re-alignment of front iris with respect to the spontaneous emission
axis
- lasing at 250 nm; optimisation of cavity axis in position and angle
- alignment of back iris
September 17th-18th 2000: FEL Run #12 (2.5 shifts)
- lasing at 350 nm and alignment studies
- lasing at 241–264 nm with new mirrors
September 3rd 2000: FEL Run #11 (2 shifts)
- electron beam studies in the FEL mode
July 29th 2000 FEL Run #10 (1.5 shifts)
- lasing attempts with fluoride multilayer mirrors
July 15th-16th 2000; FEL Run #9 (2 shifts)
- lasing attempts with fluoride multilayer mirrors
July 1st-2nd 2000: FEL Run #8 (3 shifts):
- studies of spontaneous emission and laser polarization properties
at 350 nm
June 17th-18th 2000: FEL Run #7 (3 shifts):
- re-alignment after shutdown work; undulator calibration; first tests
with fluoride mirrors
May 27th-28th 2000: FEL Run #6 (3 shifts):
- lasing at 350 nm and 220 nm; shortest wavelength 217.9 nm,
extracted power 10 mW.
May 14th-15th 2000: FEL Run #5 (3 shifts):
- lasing with new front mirror and laser characterisation at 350 nm
March 25th-26th 2000: FEL Run #4 (3 shifts):
- further studies of lasing at 350 nm with different combinations of
multilayer mirrors with
semi-transparent (sapphire/silica) substrates and opaque (silicon)
substrates with hole output coupling
March 11th-12th 2000: FEL Run #3 (4 shifts):
- study of lasing at 350 nm with silica/sapphire mirrors; maximum power
extracted 19 mW
- lasing at 350 nm with the front mirror replaced by a coated silicon
mirror with hole output coupling
February 28th/29th 2000: FEL Run #2 (1 shift).
05:35 February 29th: First lasing at 350 nm
February 18th-19th 2000: FEL Run #1 (3 shifts).
- front mirror aligned and 350 nm spontaneous radiation reflected off
the front mirror observed at the
position of the back mirror.
February 17th 2000: Mirror chamber installation complete, including
first phase 350 nm mirrors
supplied by LURE.
January 17th 2000: Mirror chambers arrive from Daresbury Laboratory.
December 11th-12th 1999: First optical klystron spectral measurements
i.e. with both undulator
sections closed (circular polarization mode) and with the electromagnetic
modulator in operation.
From these measurements the first evaluations of energy spread have
been made in FEL mode
(1 GeV, 4 bunches).
November 28th 1999: First measurements of spontaneous radiation spectra
in the new
FEL diagnostic area from a single undulator section in the circular
polarization mode at 1 GeV.
November 1st-12th 1999 (shutdown): Installation of FEL beamline back-end.
October 13th 1999: First closure of undulator sections, measurements
of tune shifts etc., and
opening of the FEL beamline front-end.
September 20th-29th 1999 (shutdown): Installation of both undulator
sections and electromagnetic
modulator, and new upstream bending magnet vacuum chamber.
August 2nd-22nd 1999 (shutdown): Installation of insertion device vacuum
chamber and new
downstream bending magnet vessel.
May 1st 1998: start of EC contract
June 1997: proposal to the European Commission for funding
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