SN DAQ for IceCube Marc Hellwig Universität Mainz IceCube DAQ Meeting, Berkeley, 28.10.2002 Expected Signal Time resolution in Simulation Artificial Deadtime.

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SN DAQ for IceCube Marc Hellwig Universität Mainz IceCube DAQ Meeting, Berkeley, Expected Signal Time resolution in Simulation Artificial Deadtime and Thresholds New DAQ and SNEWS Summary

Expected Signal Marc Hellwig Universität Mainz IceCube DAQ Meeting, Berkeley, Signal in a H 2 O Cherenkovtelescope taken from Burrows et. al: The future of supernova neutrino detection SN detection with neutrino telescopes Energy of the ν e in the range of multiple MeV For trace reconstruction with Amanda approx. 100 GeV necessary But: ν e + p e + n creates 110 counts signal on top of the normal noise (center of the galaxy 8.5 kpc) Number of counts was approximated using the 1987a Kamiokande data +

Expected Signal Marc Hellwig Universität Mainz IceCube DAQ Meeting, Berkeley, Statistical significance can be seen only when the signals of many OMs are getting summed up Low Noiserates of individual modules improves S/N dramatically (In the SN analysis: weight factor for B4 modules = 1.0, B19 modules = 0.2 !) Measurement of integrated ν-energy possible No directional or spectral informations available For triangulation with other ν telescopes we need good time resolution. Effect of binning size ? AmandaIceCube 2ms binning 50ms binning

Time resolution in simulation Marc Hellwig Universität Mainz IceCube DAQ Meeting, Berkeley, Comparison between the Amanda and IceCube time resolutions in a MC for different binning sizes These numbers are for a known time structure of the neutrino emission ! For IceCube we want a binning of at least 10ms, going down to 2ms would make sense

Artificial Deadtime & Thresholds Marc Hellwig Universität Mainz IceCube DAQ Meeting, Berkeley, Material of glass sphere is important for reducing noise rate Afterpulses and electronic artifacts due to high gain lead to widening of the pulse distribution. We use an artifical deadtime to reduce effects on analysis (at the moment deadtime AII = 256μs) Benthos glass sphere Red OM Green Sphere Blue PM

Artificial Deadtime & Thresholds Marc Hellwig Universität Mainz IceCube DAQ Meeting, Berkeley, Distribution of maximum pulse amplitudes shows a long tail at high amplitudes (negative Voltages on x-axis) This seems to be an electronic artifact Is it possible to have a second discriminator threshold to remove these pulses ?

New DAQ and SNEWS Marc Hellwig Universität Mainz IceCube DAQ Meeting, Berkeley, New DAQ for SN system is under development XML for configuration files ROOT gets used for I/O, Threads, Port communication to make source maintenance easier (and less overhead in source code) Output files are in ROOT format and therefore can be analysed directly Integration of realtime Likelihood analysis in DAQ for participation in SNEWS Software is scalable for usage with IceCube Installation this season planned but rollback to old DAQ possible

New DAQ and SNEWS Marc Hellwig Universität Mainz IceCube DAQ Meeting, Berkeley, Calculation of moving average and moving sigma for Likelihood maximation Automatic selection of noisy channels Fast enough to run as a part of the DAQ We‘ll test a sandbox version of the SNEWS alarm function this season

Summary Marc Hellwig Universität Mainz IceCube DAQ Meeting, Berkeley, Useful binning for IceCube would be 10ms or better Artificial deadtime helps reducing afterpulses and electronic artifacts. Settings up to 1ms are desirable Upper Threshold for discriminator can possibly further reduce electronic noise (further investigation in progress) New DAQ using established software standards (XML, ROOT) under development that can be scaled up for IceCube usage Online Likelihood Analysis of Signal finished, will be included in Software Upgrade this season Trigger for SN alert system will be tested in Winter