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TAROGE Project Taiwan Astroparticle Radiowave Observatory for Geo‐synchrotron Emissions

TAROGE is a project based in Taiwan that aims to study cosmic accelerators and the acceleration of cosmic particles through the observation of UHECRs and GZK neutrinos using radio antenna arrays. The project aims to identify the sources and mechanisms behind these cosmic particles.

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TAROGE Project Taiwan Astroparticle Radiowave Observatory for Geo‐synchrotron Emissions

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  1. TAROGE Project Taiwan Astroparticle Radiowave Observatory for Geo‐synchrotron Emissions Tsungche Liu for TAROGE collaboration (National Taiwan University) PSROC2016 NSYSU, KaoHsiung Jan 26 2016

  2. Jerry Shiao LeCosPA Experimental Group Jiwoo Nam Ming-Huey A. Huang Min-Zu Wang Pisin Chen Chin-Hao Chen Tsungche Liu JianJung Huang Shih-Ying Hsu Yao-Chung Chen Jakub Ripa Shi-Hao Wang

  3. Astrophys Potentials One of 11 science questions for the new century:(US NRC Turner Committee Report, 2003)“How do cosmic accelerators work and what are they accelerating?” • Origin of UHECR beyond the ankle: p + cmb→ +→ n++ → → e • UHECR: Top-down or bottom-up? • If bottom-up, what accelerates the cosmic particles? • Where are the sources?  GZK neutrino spectrum and directions indispensable; Every neutrino points back to its source!

  4. TAROGE: Taiwan Astroparticle Radiowave Observatory for Geo-synchrotron Emission • Radio Antenna Arrays on top of high mountain • Looking toward the ocean  Many high mountains (2-3km) on the East coast • Searching air-shower induced radio pulses • Large coverage (up to the horizon) • High Duty Cycle (~100%) Smaller coverage than ANITA, but lower threshold and longer operation time!

  5. Geo-synchrotron Emission Particle Aakaryan Radiation: radially polarization Shower Geo-synchrotron Radiation: the polarization is normal to shower and magnetic field direction. B Field Cherenkov Cone

  6. FLASH & T-510 experiment Verify the askaryan effect and Geo-synchrotron ration FLASH: Observation of the Askaryan effect and Measurement of Radio Propagation in Ice. T-510: Measure the radio frequency emission from cascades of secondary particles in a dense medium in the presence of a magnetic field.

  7. TAROGE-1 A prototype station at 1km height @ Heping 12 Antennas (6 V-pol + 6 H-pol) Deployed in July 2014 Successful year-round operation for noise survey

  8. TAROGE-1 Validation Calibration pulser system Interferometry image of a pulser event Angular resolution vs SNR Recorded waveforms of a pulser event (V-pol)  Excellent demonstration of detection concept and feasibility

  9. TAROGE-1 Noise Map Noises are well identified; mainly from industry facilities and local traffic Frequency band can be adjusted avoiding strong CWs (<150 MHz, 250-270MHz) I

  10. TAROGE-2 6 dual pol. LPDA antennas on 3 towers No town in FOV / CW insensitive trigger Longer baseline, time resolution improved  Better pointing resolution Off-grid power 10

  11. TAROGE-2 Resolution: elevation ~0.12o azimuth ~0.05o start data taking from Dec/23rd, 2016 and transfer data back to NTU via 4G mobile system Background spectra 11

  12. Summary and Future -Radio is a promising method for feature UHE neutrinos and cosmic rays -TAROGE-10 has been funded by MOST Vanguard program Hard Work & Work More 12

  13. Backup Slides

  14. TAROGE Station • Dual polarized LPDA Antennas (100-300 MHz) • 3 masts and 6 antennas (interferometry avaialble) • Use affordable commercial digitizer • Funded for initial study Prototype 2013  Full station 2014 Straight forward for future extensions

  15. ANITA ANITA vs. TAROGE Cosmic ray Atmosphere TAROGE Direct AERA Reflected Mountain Ocean Ground Antarctic Ice 15

  16. TAROGE Prototype (2014) 1000 m altitude site in HePing (T-Cement) 12 LPDA Antennas 6 V-pol, 6 H-pol 100-300 MHz Band 4 Multi-band trigger In-house LNA, Commecial digitizer (made in TW) Commissioning July 2014 Trigger Boards DAQ Box Antennas / LNA Mount 16

  17. TAROGE System 12 LPDA antennas (6 H-pol 6 V-pol) NTU LNA Multi-band, Multi-antenna trigger Commercial Digitizers 17

  18. TAROGE Prototype (2014) 1000 m altitude site in HePing (T-Cement) 12 LPDA Antennas 6 V-pol, 6 H-pol 100-300 MHz Band 4 Multi-band trigger In-house LNA, Commecial digitizer (made in TW) Commissioning July 2014 Trigger Boards DAQ Box Antennas / LNA Mount 18

  19. Site Survey 19

  20. TAROGE-1 Validation / Calibration Ground Pulser Event Interferometry map Time Resolution 20

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