1. WP 4.2 review meeting Simulations, libespec... some thoughts bino@hep.ucl.ac.uk Wednesday, 13 September 2006, UCL, bino@hep.ucl.ac.uk

2. Creating a simulation/analysis library : introducing libespec Important aims : - high granularity, “little black boxes” as Stewart put it :) - plain ANSI C for portability and easy interface with e.g. ROOT, LabVIEW... - highly and accurately documented (Doxygen) - system independent (GNU autotools) - using real physical SI units such as Hz, sec, kg etc instead of e.g. “Inverse samples times Nyquist frequency in GHz divided by Pi to the power 2/3”... or something similar ;))). That said... were are we with this ? Heavy construction ! Code lives in CVS under : http://cvs.hep.ucl.ac.uk/viewcvs/especSoft/?cvsroot=LC+Energy+Spectrometer And has it's web page with latest distribution tar ball + documentation in pdf/html format http://www.hep.ucl.ac.uk/~bino/libespec/

3. Wednesday, 13 September 2006, UCL, bino@hep.ucl.ac.uk BPM/Electronics simulation using libespec Describe signals from BPMs as complex waveforms Choose physical sampling frequencies and system of units e.g. : // generate an LO source at 2939 MHz, sample it at 35 GHz to use in code here AddComplexLO( 5.*Volt, 2929*MHz, 1.2, 0., 0., 35*GHz, samples, LO, t ); // generate a BPM waveform, sample it at 35 GHz as well to use in the code AddComplexWaveform( 5.*Volt, 2.856*GHz, 1.5, 200*nsec, 50.*nsec, 0., 35*GHz, samples, RF, t ); // the mixer, having -2dB power conversion and 20 dBm 1dB compression factor MixComplexWaveforms( RF, LO, IF, samples, -2.0, 20. ); // apply a lowpass filter : 10th order butterworth low pass filter... // with cut off frequency of 100 MHz... ButterworthLowPass( IF, samples, 35.*GHz, 100.*MHz, 10 ); // digitise the waveform DigitiseWaveform( IF, samples, t, adc, 119.*MHz, 10.*nsec, 0.5*nsec, 256, 14, -2.5, 2.5, 75.0 );

4. Wednesday, 13 September 2006, UCL, bino@hep.ucl.ac.uk BPM/Electronics simulation using libespec Simulate real electronics, e.g. non-linearity and conv. loss Waveform digitisation, with saturation, noise, pedestal etc...

5. Wednesday, 13 September 2006, UCL, bino@hep.ucl.ac.uk A really tacky flow chart !!! RealBPM GdFidl (cavity par.) Waveformsimulation reconstructi on LIBESPEC... Electronic s digitisatio n Electronic s digitisatio n simulation Also include mover simulation (vibrations, etc....) Also include mover simulation (vibrations, etc....) Process e.g. Tracked particles from ELEGANT simulations and have a full Process e.g. Tracked particles from ELEGANT simulations and have a full simulation of the BPM spectrometer based upon a single C library at all stages (online LabVIEW, offline analysis, FPGA ?? )... Maybe base nanoBPM/ESA production codes on same set of core routines... Maybe base nanoBPM/ESA production codes on same set of core routines... NEED TO DISCUSS ON THE FURTHER STRUCTURE OF ACTUAL ESPECSIM !!! NEED TO DISCUSS ON THE FURTHER STRUCTURE OF ACTUAL ESPECSIM !!!