Typical Uncertainties Reached at BESSY II

For BESSY II typical 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=3 eV
to 3 keV
E=3 keV
to 10 keV
E=10 keV
to 15 keV
electron beam current / 10.000(2) mA I 0.20 0.20 0.20
electron energy / 1718.60(6) MeV W 0.1 0.3 1.4
mag. induction / 1.30000(13) T B 0.06 0.3 1.8
eff. vertical divergence / 3.5(7) μrad Σy 0.06 0.2 0.4
distance to source point / 30000(2) mm d 0.1 0.1 0.1
angle to orbit plane / 0.000(2) mrad Ψ 0.04 0.2 0.3
total 0.3 0.6 2.3

N.B: the uncertainty reads as follows: 10.000(2) mA means 10 mA ± 0.002 mA (1 σ values)

 

images/uncertainbessy01.png

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

Corresponding values for Metrology Light Source.

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last update: 2011-09-30
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