Commissioning of ICAL prototype detector electronics

1. Commissioning of ICAL prototype detector electronics B.Satyanarayana TIFR, Mumbai

2. The team Anita Behere, V.B.Chandratre, V.M.Datar, Sudheer K.Mohammed, P.K.Mukhopadhyay, S.M.Raut, R.S.Shastrakar, Vaishali Shedam Bhabha Atomic Research Centre, Mumbai, 400085 Satyajit Jena Indian Institute of Technology Bombay, Mumbai, 400076 Sarika Bhide, Manas Bhuyan, S.R.Joshi, S.D.Kalmani, Shekhar Lahamge, N.K.Mondal, P.Nagaraj, B.K.Nagesh, Shobha K. Rao, L.V.Reddy, Asmita Redij, M.Saraf, B.Satyanarayana, R.R.Shinde, S.S.Upadhya, P.Verma Tata Institute of Fundamental Research, Mumbai, 400005 B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

3. Electronics scheme for prototype Design and fabrication of almost all the components is completed B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

4. RPC stack for ICAL prototype B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

5. BigStack status Telescope X-plane B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

6. Prototype electronics checklist • Preamp for prototype detector • 16-channel analog front-end • 32-channel digital front-end • Control and data router • Trigger and TDC router • Data and monitor control module • Data and monitor readout Module • Final trigger module • Power supplies & monitoring • On-line monitoring & services • DAQ & analysis software • Summary and action plan B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

7. Front-end inventory per layer • 2 planes (X & Y) • 64 readout channels • 8 preamplifier boards • 4 Analog Front Ends • 2 Digital Front Ends B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

8. Preamplifiers • HMCs inventory • First stage negative input(1595): 1500 pcs • First stage positive input(1597): 1500 pcs • Second stage(1513): 1400 pcs • 2 types of preamps for X and Y planes • Cascaded HMCs, Gain: 80, 8-in-1 • Rise time: 3nS, Noise band: ±7mV • Need about 100 boards per stack • About 15 ready, 6 installed on X-plane • Installation in full swing … • Problem with Y-plane boards B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

9. Characterisation of the front-end B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

10. 16-channel analog front-end • Functions • To digitize the preamp signals • To form the pre-trigger (Level-0) logic • Signal shaping • Features • Based on the AD96687 ultra-fast comparator • Common adjustable threshold going up to 500mV • VTh now at -20mV • ECL output for low I/O delay and fast rise times B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

11. 32-channel digital front-end • Functions • Latch RPC strip status on trigger • Transfer latched data serially through a daisy chain to the readout module • Time-multiplex strip signals for noise rate monitoring • Generate Level-1 trigger signals • Features • Latch, shift register, multiplexer are implemented in CPLD XC95288 • Trigger logic is built into a CPLD XC9536; flexible • Data transfer rates of up to 10MHz B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

12. Control and data router • To route the control signals and shift clock from controller to the individual FEP modules • To route the latch data from all the FEPs to the readout module • To route strip signals from FEPs to the scalers for noise rate monitoring B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

13. Trigger and TDC router • To route the m-Fold signals from each RPC plane to the final trigger module • To route TDC stop signals (1-Fold) from each plane to the TDC module • All signals are in LVDS logic, except TDC stop signals which are in ECL logic for achieving better timing resolution B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

14. Data and monitor control module • On FTO, triggers all the FEPs to latch the strip signals • Initiates serial data transfer to the readout module • Manages the noise rate monitoring of strip signals, by generating periodic interrupts and selecting channels to be monitored sequentially • CAMAC interface for parameter configuration (like data transfer speed, size, monitoring period) as well as diagnostic procedures B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

15. Data and monitor readout Module • Supports two serial connections for event data recording of X and Y planes and 8 channels for noise rate monitoring • Serial Data converted into 16-bit parallel data and stored temporarily in 4k FIFO buffer • Source of LAM for external trigger source • CAMAC interface for data readout to Computer B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

16. Final trigger module • Receives m-fold layer triggers and generates m  n fold final trigger • Final trigger out (FTO) invokes LAM and is Logic Trigger Out (LTO) vetoed by gated LAM • Inputs can be selectively masked • The rates of different m  n combinations counted by embedded 16-bit scalers • Rate monitoring of LTO signal using the built in 24-bit scaler • Logic inputs and m  n signals are latched on an FTO and can be read via CAMAC commands • Implementing using FPGA adds to circuit simplicity and flexibility B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

17. Power supplies and monitoring • Essentially commercial solutions • Low voltage & monitoring • CAEN’s 1527 mainframe • EASY 3000 system • Multi-channel, adjustable voltage, high current modules • High voltage & monitoring • CAEN’s 2527 mainframe • RPC bias current monitoring • CAEN’s 128-channel ADC board in 2527 mainframe B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

18. Low voltage current inventory • Preamps • ±6V 16.32A each • AFEs • +6V 28.8A for each plane • -6V 34.8A for each plane • DFEs • +8V 11.76A for each plane • -8V 6.36A for each plane B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

19. On-line monitoring & services • On-line web portal for monitoring chambers under test as well as ambient conditions of the laboratories • Chambers • High voltage and current • Strip noise rates • Cosmic muon efficiency • Ambient parameters • Temperature • Relative humidity • Barometric pressure • Magnet control and monitoring • Gas system control and monitoring • Web based electronic log book B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

20. Scheme of on-line web portal B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

21. Screenshot of DAQ software B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

22. BigStack data analysis B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008

23. Summary and action plan • Prototype electronics in reasonable shape • Extra manpower for preamp commissioning • Efforts to solve Y-plane preamps • Hopeful of solving final trigger board issues in a week or so • Should be ready by June 2008 • Fabrication of scintillator paddles’ in summer • GUI front-end for DAQ program • Further improvements for monitoring possible B.Satyanarayana, TIFR, Mumbai INO Collaboration Meeting, BARC, April 13-14 2008