Cavity Sensitivity Estimates

Position Cavity

The dipole mode sensitivity was estimated from the following formula, the measured external quality factor of 617 and R/Q from simulation in several codes, of which CST and GdfidL use a hexahedral mesh while Ace3p uses a tetrahedral mesh:

Code R/Q /Ω Sensitivity/V nC-1 mm-1
GdfidL 0.85 8.7
Ace3p 0.77 8.3
CST 0.77 8.3

Reference Cavity

The measured external quality factor of the reference cavity is 203.

Code R/Q /Ω Sensitivity/V nC-1Sorted ascending
Ace3p 9.8 52
CST 10 52
GdfidL 28.2 87

possense.png refsense.png

Electronics Chain Propagation

Electronics gain/dB 5
Cable loss/dB -2.6
Position cavity attenuation/dB 6
Reference cavity attenuation/dB 20

Position signal (offset=1mm, charge=1nC) Reference signal (Charge=1nC)
Location Volts dBm Volts dBm
Cavity out 8.3 31.4 52.0 47.3
Electronics in 4.2 25.4 5.2 27.3
Electronics out 7.4 30.4 9.2 32.3
Digitiser in 5.5 27.8 6.9 29.7

  • Position scale factor: 1.25 mm

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Topic revision: r10 - 12 Apr 2013 - FrankieCullinan

 
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