IceCube DAQ Mtg. 10,28-30 IceCube DAQ: “DOM MB to Event Builder”
RASTA: The Radio Air Shower Test Array Enhancing the IceCube Observatory M. A. DuVernois University...
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Transcript of RASTA: The Radio Air Shower Test Array Enhancing the IceCube Observatory M. A. DuVernois University...
RASTA:The Radio Air Shower Test Array
Enhancing the IceCube Observatory
M. A. DuVernoisUniversity of Wisconsin
IceCube Research Centerfor the
RASTA & IceCube Collaborations
• Geo-synchrotron extension to the IceTop component of the IceCube (deep in-ice + surface) experiment
• Built on the, now multiple, MHz RF cosmic ray experiments plus the existing IceCube Observatory at the South Pole
• In addition to CR measurements, extending the aperture of the surface array is significant as a CR veto to IceCube and lower-energy denser infill detectors at IceCube
RASTAOverall scheme & simulations
RASTA OverviewVision
~1000 antennasup to 3km from centerÈ Usable up to 60°
Radio emission from EAS Geosynchrotron:
charged particles in the shower emit radio waves in earth magnetic field (10-100MHz)
Advantages suitable threshold: at a few PeV low per-channel & per-area cost easy and fast to deploy @ South Pole
(at surface & with no freeze-in)
Physics same as IceTop (cosmic rays)+ enhanced zenith reach+ sensitivity to Xmax + multi-detector eventsè control systematics
SimulationsRadio signal simulation
REAS3 [T.Huege et. al] CORSIKA based per-particle treatment agrees well with
LOPES experimental data very slow (~8hrs/event)
Fast simulation based on parametrizationè under development
Antenna simulation NEC 4 (LLNL package)è account for snow effects
Shower simulations
Signal amplitude all electrons contribute
to radio signal signal unattenuated in
atmosphereè measures integral
electromagnetic energy è good proxy for Eprim
Lateral signal distribution field strength amplitude vs. distance
to shower axisè exponential function slope depends on
depth of shower maximum Xmax
è additional handle on composition
RASTAPlans for the array
Radio Air-Shower Test Array provide all prerequisites
for a large scale array
Multi-staged setup use existing infrastructure
for first steps commercial central DAQ cabling networking
develop new technologiesin parallel
buffered local DAQ self-triggering precision timing
IceTopstation
radioantennas
trench
magneticnorth
networkhub
FCUcable
SJB
to ICL
100m
Timeline
DAQ electronics developm
ent
Analysis of second year data
Analysis of first year data
Fast simulation developm
ent effort
First season: detect air-showers different antenna types dedicated transients study Ø(16) antennas
è proof of viability
Second season: demonstrate key technologies collect enough data for dummy analysis
Ø(70) antennasè reliable sensitivity estimate
Third season: refinement of trigger logic calibration with source
In past year: Proposal for large array, data taking with ARA
Description in arXiv:1010.1737
RASTAARA (Askaryan Radio Array) TestBed
2010 ARA TestBedSouth Pole R&D efforts
test antenna designs determine noise levelè symbiosis with
ARA effort
Current setup two antennas
at ARA TestBed data since
Jan 16th, 2011
Continuous background galactic noise thermal self noise fold with antenna responseè equivalent noise level: 5 μV/m
3.5m
Therefore…the status…• Proof of concept– In-ice antennas: “Death-Ray” fat `wire’ dipoles– Hardware deployment at Pole
• Proposal & Coordination– IceCube support– Proposal submitted for moderate scale array
• EMI & Analysis– Routine & flaring solar emission– Galactic noise (shown at ARA TestBed talk)
• New hardware to be installed with ARA1