koren
Uploaded by
27 SLIDES
405 VUES
280LIKES

StarBase Intensity Interferometry Update

DESCRIPTION

This report summarizes the developments presented at the University of Utah's SII Workshop held on May 13, 2014. The focus is on advancements in digitizer systems, including a 250 MHz sampling setup using NI Flex-Rio digitizers and a Virtex-5 FPGA. Continuous data streaming capabilities exceeding 6 hours and high-speed storage solutions are detailed. Methods such as periodic GPS timestamping, FFT analysis, and digital filtering techniques for signal-to-noise enhancement are discussed. The workshop emphasized challenges in real-time data processing and future collaboration needs for efficient data handling in telescope observations.

1 / 27

Télécharger la présentation

StarBase Intensity Interferometry Update

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. StarBaseIntensity Interferometry Update D. Kieda, N. Matthews, N. Traeden, J. Skowronek University of Utah SII Workshop May 13, 2014 Observatorie CA HBT Workshop

  2. Observatorie CA HBT Workshop

  3. Observatorie CA HBT Workshop

  4. Observatorie CA HBT Workshop

  5. Observatorie CA HBT Workshop

  6. Digitizer System • NI Flex-Rio digitizer Digitizer (250 Mhz sampling) & Virtex5 FPGA Front end(4 channels, 14 bit resolution (Truncate to 8 bit)) • Record to high speed 12 TB RAID system (750 Mbyte/sec) Able to stream continuously for >6 hours • Periodic GPS Time Stamp of FADC clock to better < 4 nsec rms Observatorie CA HBT Workshop

  7. Record all Streaming data: GPS timestamp • Post Processing (2, 3, ..N Telescope Coorrelations) • FFT Analysis • Develop/Apply Digital Filters to increase S/N Observatorie CA HBT Workshop

  8. Filtered PMT Spectrum Observatorie CA HBT Workshop

  9. DAQ System Preamp/Fiber Optic transmitter 250 Mhz A/D Conv PMT/APD Virtex -5 FPGA 12 TB 750 MB/Sec RAID Pxie Bus Streaming RAID Controller I Gbit/sec CPU 100 Mbyte/sec GPS Clock Virtex-5 FPGA has multiple Parallell-pipline FFT cores Real time data-Filtering/coorrelation? Pxie Backplane (4 Gbit/sec) Observatorie CA HBT Workshop

  10. Pipelined Data Analysis x2 Digital Filter Auto-correlation Tele 1 x*y Cross-correlation Digital Filter Tele 2 y2 Auto-correlation This may be the only way of keeping up with the large dataflow in real time….. Observatorie CA HBT Workshop

  11. Digitizer/Software Correlationtests with PMTs/Preamps Simulated Single PMT Measured Single PMT AutoCorrelationAutoCorrelation Observatorie CA HBT Workshop

  12. 2 PMT Cross Correlation: Noise Pickup between adjacent PMTs -Radio Crosstalk generated by RF noise from PMTs firing -Encase in RF shielding/Use Fiber optics to sample light 4nsec Observatorie CA HBT Workshop

  13. 2 PMT Cross Correlation: Residual Correlation -Cosmic ray secondary particles striking both PMTs -Cosmic ray charged particles fluorescing in fiber optic cable Observatorie CA HBT Workshop

  14. Digitizer/Software Correlation tests with PMTs/Preamps Simulated 2-PMT Cross-correlation Measured PMT Cross-Correlation background 2G events seeded correlation = 1e-3 correlation noise < 1E-4 We should be able to measure correlation with excellent accuracy! Observatorie CA HBT Workshop

  15. SII Lab Measurement/Hole diameters(Laser/Rotating Disk) Observatorie CA HBT Workshop

  16. Observatorie CA HBT Workshop

  17. Observatorie CA HBT Workshop

  18. Telescope Tracking Control System: LabView Based Servo System Remnant of “Telescope Array 1999” Observatorie CA HBT Workshop

  19. Observed tracking Performance: Alpha Lyrae Tracking Error < 0.01° Observatorie CA HBT Workshop

  20. Observatorie CA HBT Workshop

  21. Observatorie CA HBT Workshop

  22. Observatorie CA HBT Workshop

  23. Star Observations (April 2014): • αLeo (Regulus): V = +1.35 • ε Leo (Algenubi) V= +2.98 • Single Telescope Observations • Study Telescope tracking • Night Sky Noise • Interference noise • Needs some further • investigation, pipelined • filtering? • Two Telescope Observations • In Summer 2014 • Test SII & Pipelined RT analysis NSB VSCEL cutoff Signal ?? VSCEL Filter Observatorie CA HBT Workshop

  24. Observation times with the StarBase telescopes StarBase: For T= 15 min ( V =1 ) T= 97 min (V = 2) StarBase Baseline: 23m Unresolved < 1 mas (400 nm) Examples: α Leo, β Tau or η Uma Observatorie CA HBT Workshop

  25. Observatorie CA HBT Workshop

  26. Future • Testing at StarBase Summer 2014: 2-telescope correlations • Testing at VERITAS (late 2014?) • CTA observatory • Need to write Science Requirements, Level A/B requirements • Technical Design review period ending (30 days) • After TDR design gets frozen: Difficult to add after! • High priority: Need to form working group! Observatorie CA HBT Workshop

  27. CTA Design Questions • Photo-detectors (SST, MST, LST, SCT) • Telescope-to-Telescope digitization synchronization (< 2 nsec) • Digitization/Storage requirements • Data processing requirements • Real Time Monitoring • Higher order correlations Observatorie CA HBT Workshop

More Related