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

-20dB 40dB -6dB pCVD Cividec Amplifier Attenuator Cividec Diamond Detector DC-4GHz Splitter -6dB DC-4GHz Splitter -6dB 34dB -12dB -32dB -6dB HV 12V Tunnel Surface 1. The dynamic range and the three lines Front-End proposal Termination 50Ω Fc= 5 Hz Low Pass Filter DC Not yet clear: 1.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??

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

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 (Price: 8.2€) – Radiation Tolerance: Tested in

1.Front-End amplifier selection Option 3: Evaluation Boards (20dB) from Mini-Circuits (Price: 52€)

1.Front-End amplifier selection Option 4: Build our own amplifier with BJTs

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

2. Noise study in lines Example of digitalization with noise (Sigma=6.4mV) ADC Shaper Off QIE10ADC Shaper On

2. Noise study in lines Evolution of the Beam Sigma Error VS Noise Considerations: 1.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. 2.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: 1.QIE10 performs well by integrating, the mean noise value is 0 so in certain way integration filters noise. 2.As specked GausFit error increases with noise up to near 10% for these conditions and Noise sigma=102.4mV 3.For low noise (sigma 1.6mV)  Best QIE10

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

2. Noise study in lines For QIE10 we cannot amplify…so… Considerations: 1.Metres of cable considered for the simulations: 100m 2.In any case not taken into account impedance mismatching / reflections Observations: 1.For same conditions in average QIE10 performs better 2.Obviously in the previous case QIE10 part of the scan was amplified (by simulation) and therefore the SNR was better 3.Tendency shown as previously 4.QIE10 performance affected by noise and lines attenuation (SNR)