PERFORMANCE
BPM electronics for closed orbit measurement are characterised by:
• Sampling frequency of the button signals
• Output signal noise (resolution) vs. input signal strength
• Dynamic range of signals that may be applied to the unit, itself characterized by:
• Position error (linearity) vs. input signal strength for equal signals (on-center beam)
• Position error (linearity) vs. input signal strength for unequal signals (off-center beam)
• Drifts caused by environmental changes
The performance of the first regular production units is given hereafter:
Sampling frequency
Up to 40 kHz. X and Y are updated at the rate up to 10 kHz. With the internal (default) clock, the
sampling frequency is 2…2.5 kHz.
Output signal noise (resolution) vs. input signal strength
–90 dBm
–80 dBm
–70 dBm
–60 dBm
–50 dBm
100 mVrms /
√
Hz
10 mVrms /
√
Hz
1 mVrms /
√
Hz
100 µVrms /
√
Hz
10 µVrms /
√
Hz
Signal power applied to BPM inputs
Noise in ±10V Y output at 1 V/mm sensitivity for 17.12 -mm chamber in Y
Unit tested: BPM499.658MHz-X0.0607V/%-Y0.1712V/% serial #0035
Test instrument: Stanford Research SR760, Average rms = 50
Noise spectra at higher input power are
similar to the spectrum at –50 dBm input
BERGOZ Instrumentation
Multiplexed
01630 Saint Genis Pouilly, France
Beam Position Monitor
Tel. +33-450.426.642
Fax +33-450.426.643
Page 10
User’s manual
BERGOZ Instrumentation - 01630 Saint Genis Pouilly, France - Tel.: +33-450.426.642 - Fax: +33-450.426.643
TVA-VAT-IVA-USt. Nº FR88414997130 - Sàrl. capital 152K - Siren 414 997 130 R.C.S. Bourg - APE 332B
