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LCLS-parameters_test

VIEWS: 11 PAGES: 2

									                                      LCLS Parameters
  Typical measured LCLS parameters with hard and soft x-rays. Stability values (at
  bottom) are taken over a few minutes.
                                       March 3, 2011
Photon Beam                  symbol      hard        soft short       short    unit
Parameters                              x-rays    x-rays  pulse       pulse
                                                          hard         soft
Fundamental wavelength         r        6.2-1.3    25.8-6.2   6.2-1.3    25.8-6.2     Å
Photon energy                           2000-      480-       2000-      480-       eV
                                          9600       2000       9600       2000
Final linac e energy         mc2       6.7-14.7   3.3-6.7    6.7-14.7   3.3-6.7    GeV
FEL 3-D gain length            LG          3.3        1.5       ~3.3       ~1.5       m
Photons per pulse              N           2         20          ?         0.5      1012
Peak brightness                Bpk         20         0.3         ?          ?       1032 §
Average brightness (120        B         160         8          ?          ?       1020 §
Hz)
Photon bandwidth              /       ~0.2-0.5   ~0.2-1.0      ?          ?        %
   (fwhm)
Bunch charge                   Q          0.25       0.25       0.02       0.02       nC
Init. bunch length (rms)       z0        0.65       0.65       0.23       0.23      mm
Final bunch length (rms)       zf          7         20         ~1         ~1        m
Final pulse duration (fwhm)    f       70-250     70-400       <10        <10        fs
Final peak current             Ipk         3.0        1.0        ~3         ~3        kA
Electron Beam                                                                          
Parameters
Proj. emittance (injector)    x,y      0.4-0.6    0.4-0.6      0.2        0.2       m
Slice emittance (injector)    sx,y       0.4        0.4       0.15       0.15       m
Proj. emittance (undulator)   Ux,y     0.5-1.6    0.5-1.6    0.3-1.0    0.3-1.0     m
Single bunch rep. rate          f          120        120        120        120       Hz
UV laser energy on cath.        ul         25         25         ~2         ~2        J
UV laser diam. on cath.        2R          1.2        1.2        0.6        0.6      mm
 
e energy stability (rms)      E/E        0.04       0.07         ?         0.1       %
 
e x,y stability (rms)         x/x        15, 10     25, 20      ?, ?       ?, ?      %
 
e timing stability (rms)       t          50          ?          ?          ?         fs
Peak current stab. (rms)      I/I         10          6          ?          8        %
Charge stability (rms)             Q/Q          2.5           2.5    ?           ?            %
FEL pulse energy stability         N/N          <10          <10     ?          <15           %
           §
               Brightness units are photons/sec/mm2/mrad2/0.1%-BW.

                           LCLS Parameters - under development
   Doubling of photon energy: second harmonic afterburner (10% of power)
   Shorter pulse length using BC2 slots is under development.
   Double pulses: a double slotted foil to produce variable pulse pairs 20-100fs separation.
   Hard X-ray self seeding is under development (with Argonne).
   80pC, 40fs pulse mode is under development. First test established >1.2mJ at 9.4keV.
   Multi-bunch is under development.
   THz radiation: First tests have been performed.

								
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