StarBase Intensity Interferometry Update D. Kieda, N. Matthews, N. Traeden, J. Skowronek University of Utah SII Workshop May 13, 2014 5/13/2014 Observatorie.

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Presentation transcript:

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

5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop

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 5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop Record all Streaming data: GPS timestamp Post Processing (2, 3,..N Telescope Coorrelations) FFT Analysis Develop/Apply Digital Filters to increase S/N

Filtered PMT Spectrum 5/13/2014 Observatorie CA HBT Workshop

DAQ System 5/13/2014 Observatorie CA HBT Workshop PMT/APD Preamp/Fi ber Optic transmitter Pxie BusVirtex -5 FPGA 250 Mhz A/D Conv CPU Streaming RAID Controller 12 TB 750 MB/Sec RAID GPS Clock I Gbit/sec 100 Mbyte/sec Pxie Backplane (4 Gbit/sec) Virtex-5 FPGA has multiple Parallell-pipline FFT cores Real time data- Filtering/coorrelation?

5/13/2014 Observatorie CA HBT Workshop Tele 1 Tele 2 Digital Filter y2y2 x2x2 x*y Pipelined Data Analysis This may be the only way of keeping up with the large dataflow in real time….. Auto-correlation Cross-correlation

Digitizer/Software Correlation tests with PMTs/Preamps Simulated Single PMT Measured Single PMT AutoCorrelation AutoCorrelation 5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop 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

5/13/2014 Observatorie CA HBT Workshop 2 PMT Cross Correlation: Residual Correlation -Cosmic ray secondary particles striking both PMTs -Cosmic ray charged particles fluorescing in fiber optic cable

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! 5/13/2014 Observatorie CA HBT Workshop

SII Lab Measurement/Hole diameters (Laser/Rotating Disk) 5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop Telescope Tracking Control System: LabView Based Servo System Remnant of “Telescope Array 1999”

5/13/2014 Observatorie CA HBT Workshop Observed tracking Performance: Alpha Lyrae Tracking Error < 0.01°

5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop Star Observations (April 2014): αLeo (Regulus): V = ε Leo (Algenubi) V= 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 ??

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 5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop

5/13/2014 Observatorie CA HBT Workshop 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!

5/13/2014 Observatorie CA HBT Workshop 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