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Design and Simulation Studies of Resistive Plate Chambers (Ph.D Progress Seminar)

Design and Simulation Studies of Resistive Plate Chambers (Ph.D Progress Seminar). Satyanarayana Bheesette Roll number: 04412701 Supervisors Prof Raghava Varma, IIT Bombay Prof Naba Mondal, TIFR, Mumbai Department of Physics Indian Institute of Technology Bombay August 2008.

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Design and Simulation Studies of Resistive Plate Chambers (Ph.D Progress Seminar)

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  1. Design and Simulation Studies of Resistive Plate Chambers(Ph.D Progress Seminar) Satyanarayana Bheesette Roll number: 04412701 Supervisors Prof Raghava Varma, IIT Bombay Prof Naba Mondal, TIFR, Mumbai Department of Physics Indian Institute of Technology Bombay August 2008

  2. Plan of the this presentation • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  3. Next topic … • Long term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  4. Long-term stability tests of RPCs • Two small area RPCs made of Japanese glass • Operated in avalanche mode • No sign of any aging after continuous operation for 2.5 years • Long-term tests stopped end of last year • Wealth of data collected; conclusions made • Tried another large area RPC in streamer mode this year • Chamber died after a few weeks of operation B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  5. Next topic … • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  6. Honeycomb pickup panel Terminations on the non-readout end Machined pickup strips on honeycomb panel Preamp connections on the readout end B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  7. Measurement of characteristic impedance Recipe: Tune terminating impedance for each strip width until the reflected signal for injected charge pulse disappear. B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  8. Pulse profiles while measuring Z0 48 W 51 W Open 100 W 100 W B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  9. Next topic … • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  10. Graphite paint prepared using colloidal grade graphite powder(3.4gm), lacquer(25gm) and thinner(40ml) is sprayed on the glass electrodes using an automobile spray gun. A uniform, stable graphite coat of desired surface resistivity (100-200K/) can be obtained by this method. Electrode coating technique B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  11. Specifications of the new spray paint B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  12. Prototype of automatic painting machine B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  13. Screen printing parameter optimisation B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  14. Study on effect of thinner on the resistivity B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  15. Technique of screen printing on glass B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  16. Next topic … • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  17. New gas system features • 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 0.3mm capillaries • Bleeder bubblers for RPC protection • Facility to add controlled moister into the mixture • Computer interface for control and monitoring B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  18. Front-view of the new gas system B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  19. Precision calibration of the gas system Argon Iso-butane SF6 R134a B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  20. Cross-calibration of the gas system • Calibration done using water displacement method • Calibrated against the MFC monitor voltage • Cross-calibration procedure • Glass/hard plastic tube with precise inner diameter chosen. Placed on a perfectly horizontal surface. • Water droplet introduced through an opening on one end of the tube • Gas connected to this end • Gas moves the water droplet forward α gas flow • Distance, time intervals measured • Gas volume computed and compared with displayed value B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  21. Next topic … • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  22. Magnet iron installation T and C Sections of the magnet Assembled magnet B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  23. B-H curve for prototype magnet Steel sample size: 68cm  43.5 cm  4.8 cm Number of turns in coil: 25 B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  24. Next topic … • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  25. Schematic of the prototype detector stack B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  26. Prototype detector stack and the DAQ B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  27. Next topic … • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  28. Schematic of prototype detector DAQ B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  29. Preamp for prototype detector • Built as a cascade of BMC1595/BMC1597 and BMC1513 HMCs, developed at BARC, Electronics Division • Overall gain of about 80. • Rise and fall times are about 3nS and 6nS • Noise band within ±7mV B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  30. Gain characteristics of preamplifier B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  31. 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 Ph.D Progress Seminar, IIT Bombay

  32. 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 Ph.D Progress Seminar, IIT Bombay

  33. 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 Ph.D Progress Seminar, IIT Bombay

  34. 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 Ph.D Progress Seminar, IIT Bombay

  35. 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 Ph.D Progress Seminar, IIT Bombay

  36. 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 Ph.D Progress Seminar, IIT Bombay

  37. 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 Ph.D Progress Seminar, IIT Bombay

  38. Next topic … • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  39. Typical cosmic ray muon event B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  40. Efficiency time profile of an RPC B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  41. RPC absolute time resolution plots B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  42. RPC relative time resolution plots B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  43. RPC-wise timing parameters RPC Id HV(KV) Mean(nS) Sigma(nS) RelMean(nS) RelSigma(nS) AB06 09.8 49.53 2.06 -7.64 1.41 JB00 09.6 46.00 2.32 -4.47 1.67 IB01 09.8 42.31 2.15 -0.64 1.63 JB01 09.6 42.55 2.28 -0.87 1.58 JB03 09.8 43.75 2.26 -2.18 1.44 IB02 09.8 38.49 2.31 3.27 1.38 AB02 09.8 42.77 2.53 -1.21 1.51 AB01 09.8 35.30 2.16 6.33 1.71 AB03 09.8 45.82 3.23 -4.55 1.99 AB04 09.8 41.66 2.42 Reference RPC AB07 09.8 40.61 2.47 0.96 1.35 AB08 09.8 41.56 2.80 0.31 1.82 B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  44. RPC strip hit summary RPC Id = AB08 HV = 09.8KV No strips hit : 35 [ 5.4] Strips 15 + 16 : 408 [62.4] Strips 16 + 17 : 619 [94.6] Strips 15 + 17 : 425 [65.0] Strips 15 + 16 + 17 : 619 [94.6] Strips 15 x 16 : 0 [ 0.0] Strips 16 x 17 : 214 [32.7] Strips 15 x 17 : 0 [ 0.0] Strips 15 x 16 x 17 : 0 [ 0.0] Strips 15~ x 16~ x 17 : 211 [32.3] Strips 15 x 16~ x 17~ : 0 [ 0.0] B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  45. Strip hit map of an RPC in a run B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  46. RPC strip rate time profiles B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  47. Next topic … • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  48. RPC strip cluster size analysis B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  49. Next topic … • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

  50. Next topic … • Long-term stability tests of RPCs • Development of honeycomb pickup panels • Development and study of electrode coatings • Calibration and precision studies of the gas system • Design and construction of prototype detector magnet • Design and construction of prototype detector stack • Electronics, trigger, DAQ and monitoring systems • Analysis of ICAL prototype detector stack data • Study of RPC cluster size • Summary and conclusions • Presentations and papers • Acknowledgements B.Satyanarayana Ph.D Progress Seminar, IIT Bombay

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