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Anita-lite UCLA-based Simulation

Anita-lite UCLA-based Simulation. Amy Connolly April 7 th , 2005. Settings Different Anita-lite Simulation. ANITA note #33 shows how to set the inputs to Anita-lite values Anita-lite payload 2 antennas Cant angle = 10 ± , separated by 22.5 ± Anita-lite path from GPS data

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Anita-lite UCLA-based Simulation

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  1. Anita-lite UCLA-based Simulation Amy Connolly April 7th, 2005

  2. Settings Different Anita-lite Simulation • ANITA note #33 shows how to set the inputs to Anita-lite values • Anita-lite payload • 2 antennas • Cant angle = 10±, separated by 22.5± • Anita-lite path from GPS data • Anita-lite system temperature as measured from data • Model channel behavior – same a Jiwoo • Bandwidth 400 MHz – 1200 MHz (Ped’s HP400) • Trigger threshold = 4.5 £ VRMS

  3. Anita-lite flight path • Pick balloon latitude, longitude, and altitude at random from one of 25000 seconds along balloon path • Average ice depth within horizon is • ANITA-lite path: 1470 m • Circle at 80± S: 1990 m • At 1019 eV, [V]eff is ~20% lower than for balloon path along circle at 80± S.

  4. Modeling ANITA-lite Channels and Trigger • Signal summed across bandwidth for horiz. (H) and vert. (E) polarizations for each antenna separately: • E pol. of 1st antenna: • Channel 3 on • H,V ! LCP, RCP: • RCP of 2nd antenna: • 3/3 of remaining channels required to satisfy:

  5. Anita-lite System Temperature • Average system temperatures across (most of) bandwidth (400 MHz-1000 MHz): Ch1 Ch2 Ch3 Ch4 669 K 891 K 695 K 644 K RX1 RX2 680 K 669 K We add noise fluctuations to full-bandwidth signal

  6. Effective V¢sr • Sensitivity curves now in agreement at high energies • Thresholds disagree by ~1/2 an order of magnitude • Ratio of Anita-lite to Anita sensitivities • Surpasses 1/3 at high energies

  7. Deriving a Limit • Sensitivity =E dN/dE/dA/dt/d Where: =  interaction length in water = 6.02 days = 60%

  8. Limit

  9. Conclusions • Code is available to run in Anita-lite mode with the right settings • UH and UCLA’s simulations look like they’re starting to converge • Thresold difference of ~1/2 order of magnitude

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