1. LCLS Commissioning Parameters
for Phase-5 (NEH)
Parameter
Value
Comments
RF rate
30 Hz
30 Hz in linac Hz in gun hot test
Beam rate
≤30 Hz
30 Hz e- beam as baseline – 10 Hz or lower when needed – 120 Hz testing when possible
Drive-laser rate
30 Hz during e- commissioning - shutters provide lower e- rate
Bunch charge nC
0.2 nC nominal – up to 1 nC or well below 0.2 nC as desired for optimizing brightness
Drive-laser pulse length
6 ps fwhm
6-ps fwhm at 0.2 nC, but variable with charge when needed
Gun gradient
120 MV/m
Baseline level, as used in ’07 and ’08 already
Electron energy range
GeV
LCLS baseline range
Photon energy range eV
Photon pulse length
< 100 fs
Typical for 0.2 nC operation
July 29, 2009