INO prototype detector and data acquisition system Anita

INO prototype detector and data acquisition system Anita Behere, M. S. Bhatia, V. B. Chandratre, V. M. Datar, P. K. Mukhopadhyay Bhabha Atomic Research Centre, Mumbai, INDIA Satyajit Jena Indian Institute of Technology Bombay, Mumbai, INDIA Y. P. Viyogi Institute of Physics, Bhubaneswar, INDIA Sudeb Bhattacharya, Satyajit Saha Institute of Nuclear Physics, Kolkata, INDIA Sarika Bhide, S. D. Kalmani, N. K. Mondal, P. Nagaraj, B. K. Nagesh, Shobha K. Rao, L. V. Reddy, M. Saraf, B. Satyanarayana, R. R. Shinde, S. S. Upadhya, P. Verma Tata Institute of Fundamental Research, Mumbai, INDIA RPC 2007, Saikat Biswas, B. Satyanarayana Subhasish Chattopadhyay, P. R. Sarma Mumbai, INDIACentre, Kolkata, 14 th INDIA Variable TIFR, Energy Cyclotron February 2008

Introduction 13 layers of 50 mm thick magnetised iron plates 35 ton absorber mass 1. 5 Tesla magnetic field 12, 1 m 2 RPC layers About 768 readout channels Trigger on cosmic ray muons n n In situ, using RPCs Using scintillation paddle layers Record strip hit and timing information Chamber and ambient parameter monitoring B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Requirements & features of the magnet Magnetic field large enough (1 - 1. 5 Tesla) to enable momentum measurement for 1 -10 Ge. V muons produced by μ interactions within detector Piecewise uniformity Optimum copper to steel ratio Rectangular design for simplicity Low carbon magnet (Tata A-grade) steel used 4 sets of copper coils of 5 turns each with channels for water cooling Clear area for RPCs: 1. 2 m × 2. 2 m B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Magnet iron installation T and C Sections of the magnet B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA Assembled magnet 14 th February 2008

B-H curve for prototype magnet Steel sample size: 68 cm 43. 5 cm 4. 8 cm Number of turns in coil: 25 B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

RPCs for prototype detector v Using 3 mm thick Asahi Float glass procured from local market v Polycarbonate buttons, spacers and gas nozzles developed and fabricated v Resistive coat developed in collaboration with a local industry v Operated in avalanche mode using R 134: Iso: SF 6: : 95. 5: 5. 0: 0. 5 gas mixture Ref: Mondal, N. K. et al, Plenary session PL-3 B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Multi-channel gas mixing system v v v 16 pneumatically controlled outputs Molecular sieve based input filter columns Nippon Tylan made model FC-760 MFCs Parker made fine filters on the mixed gas On-line moister readout on mixed gas Output flow control by SS 0. 3 mm capillaries v Bleeder bubblers for RPC protection v Facility to add controlled moister into the mixture v Computer interface for control and monitoring Ref: Verma, P. et al, Poster session PS-1 B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Electronics scheme for prototype B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Preamp for prototype detector Built as a cascade of BMC 1595/BMC 1597 and BMC 1513 HMCs, developed at BARC, Electronics Division Overall gain of about 80. Rise and fall times are about 3 n. S and 6 n. S Noise band within ± 7 m. V B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

16 -channel analog front-end Functions n n n To digitize the preamp signals To form the pre-trigger (Level -0) logic Signal shaping Features n n Based on the AD 96687 ultrafast comparator Common adjustable threshold going up to 500 m. V VTh now at -20 m. V ECL output for low I/O delay and fast rise times B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

32 -channel digital front-end Functions n n 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 n n n Latch, shift register, multiplexer are implemented in CPLD XC 95288 Trigger logic is built into a CPLD XC 9536; flexible Data transfer rates of up to 10 MHz B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

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 RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

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 RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

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 RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

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 4 k FIFO buffer Source of LAM for external trigger source CAMAC interface for data readout to Computer B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

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 RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Power supplies and monitoring Essentially commercial solutions Low voltage n CAEN’s EASY 3000 system High voltage (Bi-polar) n CAEN’s 2527 mainframe RPC bias current monitoring n CAEN’s ADC board in 2527 mainframe Our design solution n Ref: S. Bose et al, Poster Session: PS-1 B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

On-line monitoring & services On-line web portal for monitoring chambers under test as well as ambient conditions of the laboratories Chambers n n n High voltage and current Strip noise rates Cosmic muon efficiency Ambient parameters n n n Temperature Relative humidity Barometric pressure Magnet control and monitoring Gas system control and monitoring Web based electronic log book B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Scheme of on-line web portal B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

RPC stack for INO prototype B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

RPC timing resolution plots B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Strip noise rate history plots B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Strip noise rate distributions B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Telescope monitoring history plots B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Telescope monitoring distributions B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Current status and future work Prototype magnet assembled at VECC Tested up to B of 0. 65 T at 2000 amp turns Designs of RPC gaps and mechanical casings to be used finalised About a dozen chambers under long term test Design and fabrication of electronics and data acquisition systems done; being commissioned Expecting to complete the installation in coming months B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008

Acknowledgement Manas Bhuyan, S. Joshi, Shekhar Lahamge, Asmita Redij, TIFR, Mumbai S. Bose, SINP, Kolkata M. D. Ghodgoankar, R. S. Shastrakar, BARC, Mumbai BEL, Bangalore B. Satyanarayana RPC 2007, TIFR, Mumbai, INDIA 14 th February 2008