How to measure dark matter with XENON1T SPS Annual Meeting 2014 - - PowerPoint PPT Presentation
How to measure dark matter with XENON1T SPS Annual Meeting 2014 Lukas Btikofer AEC University of Bern 30.6.2014 lukas.buetikofer@lhep.unibe.ch Indirect evidence of dark matter Dark matter candidates: WIMPs ( Weakly Interacting Massive
lukas.buetikofer@lhep.unibe.ch
Planck
1 Galaxy rotation curves Lensing Cluster lensing + x-ray
Massive Particles)
Lukas Bütikofer “How to measure dark matter with XENON1T”
=> rare event search => go underground WIMP detectable nuclear recoil E~O(10 keV)
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Detector Local dark matter density WIMP mass Particle Physics
Lukas Bütikofer “How to measure dark matter with XENON1T”
L’Aquila Teramo
1.4 km of rock (3600 mwe) => muon flux reduction by a factor of 106 XENON100:
total mass 161 kg, target mass 62 kg reached limit of 2*10-45 cm2 at 55 GeV/c2 (PRL 109, 181301 2012)
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Lukas Bütikofer “How to measure dark matter with XENON1T”
two signals S1, S2 3D position reconstruction x-y from hit pattern z from drift time => fiducialization => double scatter rejection => signal/background discrimination
Example XENON100 Waveform
Ionization signal (S2) Scintillation signal (S1)
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Lukas Bütikofer “How to measure dark matter with XENON1T”
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Lukas Bütikofer “How to measure dark matter with XENON1T”
Service Building Water Tank 6 Support Structure
Lukas Bütikofer “How to measure dark matter with XENON1T”
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Lukas Bütikofer “How to measure dark matter with XENON1T”
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Lukas Bütikofer “How to measure dark matter with XENON1T”
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Lukas Bütikofer “How to measure dark matter with XENON1T”
useful energy range for DM search Simulation of XENON1T calibration
Background spectrum from XENON100
10 external source
interest
Lukas Bütikofer “How to measure dark matter with XENON1T”
PRELIMINARY 11
Lukas Bütikofer “How to measure dark matter with XENON1T”
time
Data Read Rate
CAEN v1724 digitizers
photoelectron
directly on the board 12 peak finding and triggering is done on software level everything is read to Buffer
rate MB/s Lukas Bütikofer “How to measure dark matter with XENON1T”
High Energy veto custom programmed FPGA firmware allows for:
13 sum veto
Lukas Bütikofer “How to measure dark matter with XENON1T”
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○ 10 channels 14 bit digitizer ○ 4 NIM/TTL In ○ 4 NIM/TTL Out ○ embedded Linux ○ custom programmable FPGA
○ live integration of sum waveform ○ veto decision on pulse integral, width and risetime ○ flexible veto length (dependent on integral) ○ position dependent veto is possible ○ fast, online, passive input
input
Lukas Bütikofer “How to measure dark matter with XENON1T”
Everything prepared for XENONnT 15
Lukas Bütikofer “How to measure dark matter with XENON1T”