slide1 l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Saltdome Shower Array: Simulations PowerPoint Presentation
Download Presentation
Saltdome Shower Array: Simulations

Loading in 2 Seconds...

play fullscreen
1 / 10

Saltdome Shower Array: Simulations - PowerPoint PPT Presentation


  • 131 Views
  • Uploaded on

Saltdome Shower Array: Simulations. Peter Gorham University of Hawaii at Manoa. salsaMC.c Simulation approach. 2.5 km cube, 12 x 12 strings with 12 nodes each, spacing 225m Cubic array, cartesian coordinates--fastest for prototyping, vector operations simplified

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Saltdome Shower Array: Simulations' - binta


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Saltdome Shower Array:

Simulations

Peter Gorham

University of Hawaii at Manoa

P. Gorham, SLAC SalSA workshop

salsamc c simulation approach
salsaMC.c Simulation approach
  • 2.5 km cube, 12 x 12 strings with 12 nodes each, spacing 225m
  • Cubic array, cartesian coordinates--fastest for prototyping, vector operations simplified
  • Use earth density shell model, integrate along all neutrino tracks
  • Charged & neutral current cross sections, three flavors, EM and hadronic treated separately, Alvarez et al LPM parameterization used
  • No secondary brems or photonuclear interaction yet
  • No importance sampling--pure brute force monte-carlo integration of the volume and acceptance by counting ratio of detected interactions to total neutrino tracks started
  • Interactions must hit 5/8 antennas on node, and 5 nodes (thus 25 total antennas at 2.8 sigma each) --this is a conservative requirement to ensure tracks can be reconstructed

P. Gorham, SLAC SalSA workshop

slide3

Antenna array

Saltdome Shower Array (SalSA) concept

Salt domes: found throughout the world

Qeshm Island, Hormuz strait, Iran, 7km diameter

1

2

3

Depth

(km)

4

  • Halite (rock salt)
  • La(<1GHz) > 500 m w.e.
  • Depth to >10km
  • Diameter: 3-8 km
  • Veff ~ 100-200 km3 w.e.
  • No known background
  • >2p steradians possible

5

Isacksen salt dome, Elf Ringnes Island, Canada 8 by 5km

6

7

  • typical:50-100 km3 water equivalent in top ~3km
  • ==>300-500km3 sr possible

P. Gorham, SLAC SalSA workshop

strawman array scale compared to salt dome
Strawman array scale compared to salt dome
  • Strawman array (2.5km cube, 12 x 12 strings, 12 nodes per string--8 shown) easily fits into Humble dome (for example)

P. Gorham, SLAC SalSA workshop

choice of antenna spacing
Choice of antenna spacing
  • La = 250m (solid), 900, (dash-dot)
  • 250m assumed in sims
  • 225m spacing used gives threshold of ~50-100PeV with good detector efficiency
  • 2.8 sigma in 5/12 antennas in “node” trigger gives negligible thermal noise

P. Gorham, SLAC SalSA workshop

basic array geometry simulated
Basic array geometry simulated
  • A 2.5 km3 array with 225 m spacing, 122=144 strings, 123=1728 antenna nodes
  • 12 antennas per node, dual polarization (6 dipoles, 6 slot-cylinders)
  • ~300 km3 sr at 1 EeV
  • Threshold 1017 eV, few 100s antennas hit at 1 EeV, >1000 hits at 10 EeV
  • Rate: at least 10 events per year from rock-bottom minimal GZK predictions

P. Gorham, SLAC SalSA workshop

salsa simulations 1e18 ev event
SalSA simulations: 1e18 eV event
  • Event near bottom of detector
  • Truncated bottom Cherenkov cone evident
  • Several dozen nodes hit cleanly (several hundred antennas)

P. Gorham, SLAC SalSA workshop

event example 1e19 ev shower
Event example, 1e19 eV shower
  • Event near top of detector
  • Truncated upper Cherenkov cone clearly evident
  • several hundred nodes and several thousand antennas hit

P. Gorham, SLAC SalSA workshop

sensitivity to all gzk models
Sensitivity to all GZK models
  • Includes all recent distinct estimates that are reasonably self-consistent
  • All-Iron UHECR model (Ave et al 2004) included as rock-bottom (but is not really consistent with UHECR data)
  • None of the models shown are yet excluded
  • Maximal models set parameters as high as possible consistent w/ data
  • 3 “minimal” models, all independent calculations
    • Engel et al 01
    • Protheroe & Johnson 96
    • Aramo et al 2004

P. Gorham, SLAC SalSA workshop

existing neutrino limits and potential future sensitivity
Existing Neutrino Limits and Potential Future Sensitivity
  • RICE limits for 3500 hours livetime
  • GLUE limits~120 hours livetime
  • ANITA sensitivity, 3 flights:
    • 8 to 30 GZK neutrinos
  • IceCube & Auger estimates (based on Saltzberg 2004 Nobel symposium paper)
    • ~3-10 events for IceCube, 0.5-3 for Auger
  • SalSA sensitivity, 3 yrs live
    • 40-150 GZK neutrino events from conservative models

P. Gorham, SLAC SalSA workshop