1/8-10/2007M.A. Huang CRTNT Experiment Status  Introduction  Two prototype telescopes  Test run on ARGO-YBJ site, Tibet  Full scale experiment: 2008.

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Presentation transcript:

1/8-10/2007M.A. Huang CRTNT Experiment Status  Introduction  Two prototype telescopes  Test run on ARGO-YBJ site, Tibet  Full scale experiment: 2008  Summary Zhen Cao Institute of High Energy Physics, China 30th ICRC, Merida, Mexico, July, 2007

Introduction

1/8-10/2007M.A. Huang CRTNT  CRTNT : Cosmic Ray Tau Neutrino Telescope  Detect shower from , which comes from Earth- skimming 

CRTNT feasibility study Z. Cao, M.A. Huang, P. Sokolsky, Y. Hu, J. Phys. G, 31, , (2005) Highlight of the year 2005 of JPG

The total detection efficiency of tau neutrinos from AGN is 1.4x10 -5 The expected event number per year is 8~10 events A duty cycle of 15% & 4 sites are assumed considering a possibility of running with moon partially

Prototype

1/8-10/2007M.A. Huang Focal plane camera: 256 PMT’s cluster 5.0m 2 Spherical mirror UV filter (un-installed)

Back plane of PMT cluster 20 mirror sections (back) Each photo/digi-pulse convertor. contains PMT, shaping, dual-chann-VGA, FADC &FPGA trigger

1/8-10/2007 All-in-one design  Only processed data are transmitted to central computer via TCP/IP network.  Modularized design of photon-digitized-pulse converter 4x4 pixels. PC104(linux) Control one cluster data bus Assembled cluster

1/8-10/2007M.A. Huang Telescope housing Telescope control: remote control & monitoring of door open/close, LV & HV turn on/off Dump- truck Hydraulic lift

Test Run : coincident with ARGO-YBJ RPC Array 1.Sky background 2.Monocular coincident with ARGO 3.Stereoscopic coincident with ARGO

Test run  Lift to high elevation angle (60  or 83  ) for observation of cosmic ray shower.  ARGO-YBJ site:, Tibet.  Coincident with ARGO-YBJ  Cross-calibration

YBJ Sky background Star trajectories Test on DC coupling & PMT responses Stability of Telescopes during Hours of operation

Background signal amplitude distribution

Pointing error Adjusted Locating Possible Stars  Each “fired” PMT is used to predict the R.A. and Dec. of the stars

Cosmic Rays

CRTNT-1 CRTNT-2 Tilted 60  up South-west pointing 50m N

Stereoscopic View of a Shower CRTNT-01 CRTNT-02

Monocular Coincident with ARGO

Estimate of Threshold Energy Mono-hybrid

Shower core distribution mono stereo

Arrival direction distribution mono stereo

Full Scale CRTNT Exp. 4 stations, each has 4 telescopes, covering 14  64  field of view. Site: Balikun, Xingjiang, China Energy range: E > 100TeV for neutrino, and E > 0.1EeV for UHECR. UHECR Mountain-passing  event C Earth-skimming  event

Potential sites Mt. Balikun, Xinjiang, China 10km from Town Balikun ~2000km from Beijing Mt. Wheeler Peak, Nevada, USA 36 mi from Ely, ~300mi from Las Vegas

Sensitivity Summary Defined as flux upper limit of  Assume  (E )  E -2  Assume no signal in 2 years of observation  Feldman- Cousin method for upper limits: 2.44 signal events CRTNT

Further schedule  2005 ~ 2007: 2 prototype telescopes completed, now testing at YBJ, Tibet  2007~2008: Phase-1,  Build 8 telescopes.  Prototype telescope operation (addition of each new built telescope)  2009: Phase-2,  Build the rest of telescopes  2010 ~ : Next stage

Summary  CRTNT is complimentary to underground neutrino detectors watching the south hemisphere  CRTNT is as effective as IceCube with a much smaller price.  2 prototype telescopes are completed and testing at YBJ, Tibet.  CRs are observed coincident with ARGO-YBJ ground RPC carpet array  8 telescope proposal (2007)  Recommendation by academic committee of IHEP Poster 2 starting today