First Results from the HiSCORE/Siberia WR setup. Plans for CTA. and. Martin Brückner (Humboldt-Univ. Berlin) Ralf Wischnewski (DESY)
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1 First Results from the HiSCORE/Siberia WR setup and Plans for CTA Martin Brückner (Humboldt-Univ. Berlin) Ralf Wischnewski (DESY) 7th White Rabbit workshop Madrid / Spain
2 Outline > HiSCORE - A new Gamma-Ray and Cosmic Ray Detector in Siberia > Required WR modifications > HiSCORE WR setup in Siberia > First Results > Outlook HiSCORE 1 km² Plans for Cherenkov Telescope Array (CTA) Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 2
3 HiSCORE > Cosmic- and gamma rays emit > Requires for all detectors Cherenkov light and radio pulses nsec clock precision time base in the atmosphere > Multiple detectors distributed over large area (1km²-100km²) trigger time stamping HiSCORE Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 3 Hundred*i Square-km Cosmic ORigin Explorer
4 WR SPEC modifications 8 ns time stamping at first Then added an in-fpga TDC* with a SERDES block Current resolution 2 ns (see next slide) Connected TDC to Wishbone Bus White Rabbit Timestamp Trigger SERDES Print trigger timestamp on terminal Send timestamp over WR-link via LM32 CPU with a maximal rate of 1 khz FIFO FPGA Standalone mode Very accurate time base and stamping Possibility to send calibration pulses to the detectors * programmed by Sébastien Bourdeauducq Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 4 Wishbone Bus
5 WR modifications TDC SERDES block needs two phase aligned clocks: o o Serial fast clock Parallel slower clock Easy way: Use the same PLL which generates the 62,5 MHz Wishbone Bus clock to get a 500 MHz phase aligned clock for 2 ns accuracy White Rabbit Timestamp Trigger SERDES FIFO FPGA Fast clock 0,5 GHz 1GHz Slow clock 62,5 MHz 125 MHz o We did this because of not touching too much of the White Rabbit timing system Future: Use the WhiteRabbit 125 MHz clock to generate 1GHz for 1 ns accuracy Wishbone Bus Wishbone clock 62,5 MHz o OK, Tom did this Thanks Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 5
6 HiSCORE setup overview HiSCORE station Tunka station HiSCORE station HiSCORE station DAQ center HiS-Station More HiSCORE stations in future > 1 km² in 2013/14 : stations > 100 km²: > 2000 stations Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 6
7 HiSCORE setup overview WR-Switch Basic HiScore station setup DAQ-Central station Raspberry Pi Media converter Standard fiber HiSCORE station FPGA SPEC USB FMC DIO card SFP TDC in PPS out 2 PPS out DRS4 WR fiber To DAQ center SPEC card Raspberry Pi DRS4 as 5 GHz digital scope Raspberry Pi transports USB Terminal DRS4 (Domino Ring Sampler) Temperature sensor Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 7
8 HiSCORE setup HiScore station 1 USB USB FMC DIO card FPGA FMC DIO card FPGA SFP SFP Tunka 23 2x 1 km fiber loopback HiScore 4 USB FPGA FMC DIO card SFP WR switch PPS DRS4 PPS 95m Copper cable FMC DIO card SFP DAQ center Tunka 1 USB FMC DIO card FPGA SFP USB FPGA HiScore 3 USB FMC DIO card FPGA SFP PPS signals (DIO output 1) connected to TDC-inputs (DIO input 3) Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 8
9 HiSCORE setup: measurements Installed a number of redundant cross-calibration options : > 2km loopback fiber cable connected to DRS4 to measure and test WhiteRabbit PPS signal (Laboratory located) > Loopback PPS connection to test TDC performance (HiS 3) > Crosswise PPS->TDC connection to test TDC and WhiteRabbit Within 1 station (HiS1) Between 2 stations (HiS4 + Tunka-1), connected by 95m copper Now: based on 2ns-TDC (SPEC) future: use DRS4 for higher precision (5GHz sampling) Future: connect nsec-precision GPS to stations (candidate for a flexible field calibration tool) Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 9
10 Results - 2 km fiber loopback with DRS4 1. Test : LoopBack Fiber over 2x1km back to Laboratory (5GHz DRS4-measurement) rms <0.2 ns 14hr run Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 10
11 Measurements: 2 km Fiber Loopback 1 ns 2km Loopback WRS-SPEC (Lab.) : Clock-offset via 1PPS pulses 30 C 0.1 ns Clock-Offset = T_SPEC- T_WRS Ambient Temp CableRTT Day-1 Day-2 Delay for 15 C : 4km x 40ps/km/C = 2.4ns > 1 ns AmbientTemp.ne. FiberTemp?! Clock-Offset uncorrelated to Ambient Temp Day-3 Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 11
12 0.1 ns Measurements: 2 km Fiber Loopback (2) > 2km Loopback WRS-SPEC (Lab.) : Clock-offset via 1PPS pulses Clock-Offset = T_SPEC- T_WRS Clock-Offset: 100s averaged Clear 100ps scale largely uncorelated with ambient Temp. Board temperature? New sensors to be installed. A wide temp-range covered: 1 day Ambient Temp (eg. 8 days) Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 12
13 Results Timestamping fwhm <2 ns Tunka 1 pulses measured in HiSCORE4 via copper cable (2ns TDC resolution, 12hr run). 2ns/bin; average == 1.00sec Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 13
14 Plans for Cherenkov Telescope Array (CTA) > Same task as HiSCORE > Different energetic domain (10GeV-100TeV) > ~80 telescope array > ~1000 astronomers, ~100M > Also requires an exact time base with ns resolution > WR considered for small and medium size telescopes Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 14
15 White Rabbit for CTA : Candidate layout for Array-Timing, TimeStamping & ArrayTrigger WR-Switch Telescope 1 Trigger BulkData SlowCntr WR-Node Ethernet Event Building (= PCIe Card) WR-Eth (1000Base-LX): - TimeSync - TimeStamps / ArrayTrig Array Trigger Farm Telescope N Trigger WR-Node GPS Only a few components are needed: - per telescope : 1 x WhiteRabbit Node (PCIe) + 1 standard fiber (SM;1390/1510nm) Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 15 - per array : 1 n WhiteRabbit Switches
16 Conclusion > WR at DESY/HumboldtUnivBerlin started in February 2012 > Initial SPEC-SPEC tests at HiSCORE site in April > First WR-Switch work (vs.3.2) started in July 2012 > Installed described setup in October and started routine measurements in field TDC, Trigger Latching & Fiber Readout, Standalone SPEC operation > First results: <200 ps Jitter WhiteRabbit switch 2km fiber in field SPEC card Residual drift at 100ps level. RMS < 2ns TDC time stamping jitter (more precise measurements soon) Purpose/suggestion: use as a reference calibration & verification installation. (at least for CTA, Astroparticle community this will work) Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 16
17 Outlook > Advanced cross calibration tools: nsec-gps clock radio-phase alignment > Improve TDC-resolution: 1 ns TDC (or better) > Collecting more field-measurement data > In collaboration with other WR-teams? Welcome are suggestions from WR-community? Sharing the data?. Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 17
18 End > Thank you Martin Brückner First Results from the HiSCORE/Siberia WR-setup; plans for CTA Page 18
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