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Student Meeting Jose Luis Sirvent PhD. Student 26/08/2013

Beam Secondary Shower Acquisition System: Front-End RF Design (2). Student Meeting Jose Luis Sirvent PhD. Student 26/08/2013. 1. The dynamic range and the three lines. Front-End proposal. HV. Civi dec Amplifier. 34dB. Civi dec Diamond Detector. -6dB. DC-4GHz Splitter. 40dB. pCVD.

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Student Meeting Jose Luis Sirvent PhD. Student 26/08/2013

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  1. Beam Secondary ShowerAcquisition System: Front-End RF Design (2) Student Meeting Jose Luis Sirvent PhD. Student 26/08/2013

  2. 1. The dynamic range and the three lines • Front-End proposal HV Cividec Amplifier 34dB Cividec Diamond Detector -6dB DC-4GHz Splitter 40dB pCVD -6dB 12V Termination 50Ω Tunnel -6dB • Not yet clear: • If DC measurement is necessary then -9dB splitter: Needed lines 34dB, -15dB & -35dB 2. ADC or QIE10? ADC  Needed filters in lines 200MHz – 2GHz QIE10 Needed Amplif DC-2GHz or no Amplif Problem for Long lines + QIE10?? -12dB -6dB DC-4GHz Splitter -32dB Attenuator -6dB -20dB Surface DC Low Pass Filter Fc= 5 Hz

  3. 1.Front-End amplifier selection • Option 1: Commercial from Cividec Price: 1755 CHF Price: 1755 CHF

  4. 1.Front-End amplifier selection • Option 2: Build our own amplifier with Gali + MGA • Cheaper alternative Development of a board • Inside Cividec 40dB Gali 52 (Price: 1.2€) Agilent MGA-62563 (Price: 8.2€) • Radiation Tolerance: Tested in 2005 • http://lhc-expt-radmon.web.cern.ch/lhc-expt-radmon/meetings/2005-03/Gorisek-BCM%20in%20ATLAS.pdf

  5. 1.Front-End amplifier selection • Option 3: Evaluation Boards (20dB) from Mini-Circuits • (Price: 52€) • http://217.34.103.131/pdfs/GALI-52+.pdf • http://217.34.103.131/pcb/WTB-409-52+_P02.pdf

  6. 1.Front-End amplifier selection • Option 4: Build our own amplifier • with BJTs • http://www.intersil.com/content/dam/Intersil/documents/an15/an1503.pdf

  7. 2. Noise study in lines (In simulation) Measured in SPS BA5 New!

  8. 2. Noise study in linesExample of digitalization with noise (Sigma=6.4mV) QIE10 ADC Shaper On ADC Shaper Off

  9. 2. Noise study in linesEvolution of the Beam Sigma Error VS Noise • Considerations: • The noise is white: Distributed in the whole spectrum • ADC Shaper On Still affected but working better than Shaper Off, in practice the results should be better. • The 40dB amplifier: Considered in simulations as ideal DC-infinite Hz (In reality RF 1MHz-2GHz) • The 34dB line in practice could not be used by the QIE10 since it has a high-pass filter, the value used should be -6dB • Observations: • QIE10 performs well by integrating , the mean noise value is 0 so in certain way integration filters noise. • As specked GausFit error increases with noise up to near 10% for these conditions and Noise sigma=102.4mV • For low noise (sigma < 1.6mV)  Best ADC Shaper ON / For high noise (sigma > 1.6mV)  Best QIE10

  10. 2. Noise study in linesFor QIE10 we cannot amplify…so… HV Surface Tunnel • Long lines QIE10 Front-End proposal -6dB Cividec Diamond Detector -6dB DC-4GHz Splitter -20dB pCVD Attenuator Long CK50 link (~100m) -6dB -20dB DC Low Pass Filter Termination 50Ω Fc= 5 Hz QIE10

  11. 2. Noise study in linesFor QIE10 we cannot amplify…so… Considerations: Metres of cable considered for the simulations: 100m In any case not taken into account impedance mismatching / reflections Observations: For same conditions in average QIE10 performs better Obviously in the previous case QIE10 part of the scan was amplified (by simulation) and therefore the SNR was better Tendency shown as previously QIE10 performance affected by noise and lines attenuation (SNR)

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