neutrino astronomy francis halzen university of wisconsin
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1 neutrino astronomy francis halzen university of wisconsin
2 50,000 year old sterile ice instead of water
3 we built a km 3 neutrino detector 3 challenges: drilling optics of ice atmospheric muons search for the sources of the Galactic cosmic rays search for the extragalactic cosmic rays gamma ray bursts active galaxies particle physics, mostly dark matter IceCube.wisc.edu
4 AMANDA Event Signatures: Muons neutrino interaction muon track n m + p m +
5 analog transient wave recorder
6 IceCube / Deep Core detects Cherenkov light from showers and muon tracks initiated by neutrinos detects ~220 neutrinos and 1.7x10 8 muons per day threshold 10 GeV angular resolution 0.4~1 degree 5320 Digital Optical Modules (DOM)
7 completed December 18, 2010 IC Season IC Season IC Season IC Season IC Season IC Season IC Season
8 IceCube event display time = color (red purple) size = number of photons
9
10
11
12 n
13
14 89 TeV 14
15 250,086 photons 10 PeV in detector probablity atmospheric: 10-3
16 electron neutrino
17 seen: 14 events predicted: 3 atmospheric and 4 background
18 we built a km 3 neutrino detector 3 challenges: drilling optics of ice atmospheric muons search for the sources of the Galactic cosmic rays search for the extragalactic cosmic rays gamma ray bursts active galaxies IceCube.wisc.edu
19 IceCube Site nozzle delivers 200 gallons per minute 7 Mpa 90 degree C 4.8 megawatt heating plant
20 IceCube drilling to best low background site on Earth: radio-pure ice no seasonal variations (temperature, humidity, ) shielded from cosmic rays by IceCube veto DM-ice, DeepCore upgrades (towards proton decay?) < 700K$ per string of 60 ten inch PMTs (data to your pc)
21 absorption length 220m
22 scattering length 47m
23 we built a km 3 neutrino detector 3 challenges: drilling optics of ice atmospheric muons search for the sources of the Galactic cosmic rays search for the extragalactic cosmic rays gamma ray bursts active galaxies IceCube.wisc.edu
24 muons detected per year: atmospheric* m 7x10 10 atmospheric** n m > 8x10 4 cosmic n m ~ 10 * > 2000 per second ** 1 every 6 minutes
25 within trigger time window down down down up
26 (not) final performance
27 IceCube performance then and now PeV: x2 EeV: x3 IceCube neutrino area predicted performance (blue) Astroparticle Physics 20, 507 (2004) neutrino mirror area Gonzalez-Garcia et al.
28 > 16 s < 1 deg moon shadow
29
30 improved angular and energy resolution soon
31 on to IceCube science we measure the flux of atmospheric muons and neutrinos at higher energies and with better statistics than previous experiments. Any deviations from what is expected is new neutrino physics or new astrophysics. We just look for surprises.
32 IceCube-40 atmospheric neutrino spectrum
33 zenith angle two analyses
34 3+1 3
35 zenith angle two analyses systematics!!! K/p ratio zenith acceptance of modules ice CR composition 36
36 early astronomy directions of ~ 600 neutrinos AMANDA 2000
37 IceCube 40 strings operated days northern sky: neutrinos search for clustering high energy (>> 100 TeV) southern sky: muons
38 nothing seen in IC40 but not finished yet! nothing expected next?
39 limits (symbols) / sensitivies (lines) to point sources ANTARES southern hemisphere northern hemisphere SUPER-K AMANDA next unblinding IC40+59 IC40 KM3: 2X3km 3 detectors 1-year sensitivity
40 we built a km 3 neutrino detector 3 challenges: drilling optics of ice atmospheric muons search for the sources of the Galactic cosmic rays search for the extragalactic cosmic rays gamma ray bursts active galaxies IceCube.wisc.edu
41 Galactic cosmic rays : must produce pionic g-rays in interactions with hydrogen in Galactic plane (1 proton cm -3 ) produce TeV gamma rays Galactic extragalactic cr + p pions p 0 gg trace cosmic rays
42 the accelerator? TeV photons trace the density of the molecular clouds
43 galactic plane in 10 TeV gamma rays : supernova remnants in star forming regions Southern Hemisphere Sky Standard Deviations milagro 210
44 neutral pions are observed as gamma rays g p 0 g p + p - n m m + n m - charged pions are observed as e + e + e - g e - neutrinos e + g m + e + n e n m n m +n m = g + g
45 cygnus region : Milagro translation of TeV gamma rays into TeV neutrinos : 3 ± 1 n per year in IceCube per source
46 preliminary Milagro: Galactic plane > 10 TeV 3s 5s n m +n m = g + g time in years
47 20,000 atmospheric neutrinos later
48
49 IC22 and IC40 : muon astronomy (!) IC22 IC40 IC59 Different geometries, same structure
50 10 TeV to several 100 TeV cosmic rays in IceCube we map the highest energy Galactic cosmic rays, but their gyroradius is < 1 pc in microgauss magnetic field closest sources > 100 pc 10 TeV 2 KHz 3 deg resolution should not point! that s why we detect neutrinos!
51
52
53
54
55 Vela closest supernova remnant strongest gamma ray source
56 we built a km 3 neutrino detector 3 challenges: drilling optics of ice atmospheric muons search for the sources of the Galactic cosmic rays search for the extragalactic cosmic rays gamma ray bursts active galaxies IceCube.wisc.edu
57 collapse of massive star produces a gamma ray burst spinning black hole photons and protons coexist in the fireball if GRB are the sources of the cosmic rays neutrino production
58 flux Radio CMB Visible GeV g-rays energy (ev) 410 photons of 2.7 K or erg/cm 3 / galactic cosmic rays erg/cm3 galactic cosmic rays erg/cm 3 extragalactic cosmic rays 3x10-19 erg/cm 3
59 Cosmic Rays & GRBs Extragalactic observed energy density of extragalactic CR: 3x10-19 erg / cm 3 Gamma-Ray Bursts: 2x10 52 ergs x 300/Gpc 3 x yr 3x10-19 erg / cm 3 GRBs provide environment and energy to explain the extragalactic cosmic rays!
60 n and Neutrino g beams Beams: : heaven Heaven & and Earth earth NEUTRINO BEAMS: HEAVEN & EARTH black hole radiation p + g n + p + ~ cosmic ray + neutrino p + p 0 ~ cosmic ray + gamma
61 collide cosmic rays of GRB origin with microwave photons + 0 p + g n + p and p + p cosmic rays from n-decay
62 GRB origin of cosmic rays challenged p 0 gamma rays after cascading in the microwave background p + neutrinos
63
64 GRB on probation 3x10-19 erg/cm 3 over years = 5x10 44 TeV Mpc -3 yr reduce by ten more reasonable 2x10 51 erg per GRB cannot explain the cosmic rays above the knee escape IceCube 40 string diffuse bound new prediction for year data Waxman: 12.4 events Guetta: 14.5 events none seen
65 GRB only yield the highest energy particles, not the cosmic rays above the knee
66 NOT a GRB neutrino(?) within 40 s duration of the burst azimuth of burst deg observed /- 0.3 we keep looking!!!
67 1~1.5 events/yr
68
69 3+1 neutrinos? ~20σ without oscillations with oscillations IceCube science
70
71 WIMP Capture and Annihilation c n m n DETECT c + c W + W n + n b + b n + n
72
73
74 conclusions Hess and still no conclusion the instrumentation is in place supernova remnants and GRB are in close range!
75 back up slides
76
77 arxiv:
78 neutrinos from the center of the Galaxy
79 South Pole 2000 AMANDA South Pole Dome 1500 m 2000 m [not to scale] Amundsen-Scott South Pole station
80 AMANDA: simple high voltage supplied via (coax, twisted pair, fibre optic) cable analog photomultiplier signal up via same cable successful photomultiplier pulses after 2 km not pretty WHAT DO WE REALLY NEED? complex wave form information (scattering in ice) large dynamic range; more that 10 6 low power consumption stable operation, easy calibration ANSWER : ANALOG TO DIGITAL CONVERSION
81 Each optical module must become a complete semi-autonomous data acquisition platform, linked in an all digital decentralized network Let s make 5000 complex tethered satellites and bury them forever in ice Will the cold keep them from working? Nothing like this has ever been done What if we make a mistake we can t fix?
82 oscillator F P G A 750 years mtbf ATWD
83 architecture of independent DOMs 10 inch pmt LED flasher board main board HV board
84
85 each DOM is independent: continuously sends timestamped wave forms
86 neutrino flavors
87
88 cosmic neutrinos: energy: >> 100 TeV IceCube 40 atmospheric neutrino spectrum
89 supernova 10 6 eventswith1.7m secsampling start : 3ms at 95% CL
90 2 nanosecond timing across 1 km 3
91 The Digital Optical Module (DOM) Onboard capture of PMT waveforms 300 MHz for ~400 ns with custom chip 40 MHz for 6.4 µsec with comm. fast ADC Absolute timing resolution < 2 ns (RMS) Dynamic range ~1000 p.e./10 ns Deadtime < 1% Noise rate ~700 Hz (260 Hz w / artif. deadtime) Failure rate < 1% Digitized Waveform
92 Muon event in IceCube downgoing cosmic ray muon ~ 2700 per second M. Santander - TeV cosmic ray anisotropy in IceCube (Prelim exam) - 03/07/
93
94 cassiopeia A supernova remnant in X-rays 10-3 of energy released transformed into acceleration E -2 spectrum acceleration when particles cross high B-fields
95 GRB protons and photons coexist in the fireball n production proton flux = observed cosmic ray flux (WB) observation of 117 burst with IceCube-40 strings 4 events expected, none seen
96 energy in extra-galactic cosmic rays is ~ 3x10-19 erg/cm 3 2x10 52 erg per gamma ray burst energy in cosmic rays ~ photons
97 104 drilling and deployment to 2500 m in less than 2 days 3.5 cm/second
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