Typical Uncertainties Reached at the MLS

For the Metrology Light Source typical expected uncertainties in the measurement of the parameters entering into the calculation of the spectral power ΦE(E) are summarized in the table below.

ΔΦE(E) /ΦE(E) (*10-3)
parameter / typical value E=1 eV E=100 eV E=1000 eV
electron beam current / 200.00(4) mA I 0.20 0.20 0.20
electron energy / 600.00(6) MeV W 0.07 0.12 0.67
mag. induction / 1.30000(13) T B 0.07 0.04 0.27
eff. vertical divergence / 44(9) μrad Σy 0.04 0.18 1.52
distance to source point / 15000(2) mm d 0.27 0.26 0.17
angle to orbit plane / 0.000(5) mrad Ψ 0.0007 0.003 0.03
total 0.35 0.40 1.71

N.B: the uncertainty reads as follows: 200.00(4) mA means 200 mA ± 0.04 mA (1 σ values)

 

images/uncertainmls01.png

Influence of the uncertainty in the parameters on the uncertainty of the calculated spectral radiant power
for different photon energies

Corresponding values for BESSY II.

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last update: 2011-09-30
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