1. Towards a final design of LAV front-end M. Raggi, T. Spadaro, P. Valente & G. Corradi, C. Paglia, D. Tagnani

2. Front-end board (single channel)

3. Front-end board prototype Prototype board 16 channels VME 6U mechanics Manual threshold control 4 by 4 channels threshold Single channel analog output Successfully tested at NA62 beam-test (Oct. 2009)

4. Front-end board (scheme) Pre-amplifier stage Dual thr. Discriminator & shaper LVDS driver CPU Threshold control Supply control ± 5 V ± 12 V CANOpen LVDS out Analog sum out Analog sum Power supply Analog in Test pulse Trigger in Final board 32 channels VME 9U mechanics Include services: Analog sums Remote threshold Individual channel threshold control Pulsing system DAC ADC

5. Analog sum architecture sum of 4 sum of 16 sum of 4 Sum scheme 4 channels x eight section 1 Sum output x 16 channels All analog outputs are buffered and 50Ω matched Dynamic range 2V with clamp circuit

6. 32 analog inputs from flange DB37 connector Board connections 8 Analog sums of 4 channels 2 Analog sums of 16 channels 10× Lemo-00 on front panel 1 Rj11 connector for communication CAN-OPEN 64 LVDS outputs to TDC 2× Robinson-Nugent (1.27 mm)

7. Analog sum output One FEE boards serves 32 channels = 1 layer 32×2 thresholds = 64 LVDS outputs 32 analog outputs can not be housed in the board: (there isn’t place on the panel) sum 4 analog signals (e.g. one “banana”) sum 4 bananas (16 channels = half a layer) Coax 50 , Lemo-00 sum 4 Su sum 16 16Ch 4Ch

8. Threshold circuit Two thresholds per channel Remotely programmable (CANOpen) Common threshold with trimmer (for redundancy, jumper-selectable) 0-500 mV range, 12 bit resolution (standard low-cost components, more than enough) 2 LSB stability Easy to implement automatic threshold scan

9. Front-end diagnostics Provide a test pulse: free-running (controlled by local CPU) or on external trigger pulse all channels or a programmable pattern 10-50 ns programmable width 10-500 mV programmable amplitude Useful to check time-over-threshold performance Ensure width and amplitude stability at 1% level monitoring of the voltage monitoring of the board temperature

10. Something like this… VME 9U example Main board with 32 daughter cards plug on Analog input Analog Sum OUTPUTs Digital OUT LVDS

11. LAV VME 9U custom crate 5-8 FEE boards TELL1 11 In from detector Out to TELL1 HV Control Power Supply LED controllers FAN Voltd.3.3Vd. +5Vd. -5Va. +5a. -5d.+48PW 1 Tell110A0.5A 0.8A80 8 FEE1A 4.0A 400 8 LED1.2A 1.5A 24V/0. 3A 275 9U 3U PW max =800W

12. Conclusion Beginning of final project : next week Estimated time for the design and the realization of the first prototype: about 3 months Moreover, it will take about 2 months to write the protocol of communication CAN-OPEN Cost for board : 3000€ (VAT not included)