The IceCube Experiment. K. Mase, Chiba univ.

Transcription

1 The IceCube Experiment K. Mase, Chiba univ.

2 The IceCube Collaboration 30 institutes and 200 physisits Bartol Bartol Research Research Inst, Inst, Univ Univ Delaware, Delaware, Univ. Univ. Alabama, Alabama, Pennsylvania Pennsylvania State State,, Clark-Atlanta Clark-Atlanta,, Wisconsin-Madison, Wisconsin-Madison, Univ. Univ. Maryland, Maryland, Wisconsin-River Wisconsin-River Falls, Falls, IAS, IAS, Princeton, Princeton, LBNL, LBNL, Berkeley, Berkeley, Kansas, Kansas, UC UC Berkeley, Berkeley, Southern Southern Univ. Univ. and and A&M A&M College, College, Baton Baton Rouge Rouge UC UC Irvine, Irvine, Chiba Chiba,, Japan Japan Canterbury, Canterbury, Christchurch, Christchurch, New New Zealand Zealand Université Université Libre Libre de de Bruxelles, Bruxelles, Belgium Belgium Vrije Vrije Universiteit Universiteit Brussel, Brussel, Belgium Belgium Université Université de de Mons-Hainaut, Mons-Hainaut, Belgium Belgium Universität Universität Mainz, Mainz, Germany Germany DESY-Zeuthen, DESY-Zeuthen, Germany Germany Universität Universität Wuppertal, Wuppertal, Germany Germany Uppsala Uppsala Universitet, Universitet, Sweden Sweden Stockholm Stockholm universitet, universitet, Sweden Sweden Kalmar Kalmar Universitet, Universitet, Sweden Sweden Imperial Imperial College, College, London, London, UK UK Oxford, Oxford, UK UK Utrecht Utrecht,, Utrecht, Utrecht, NL NL

3 The IceCube experiment deployed in the Antarctica glacier 80 strings 4800 photo-multiplier tubes (PMTs) Detector volume: 1km 3 ATWD 300MHz 14 bits 3 different gains (x15, x3, x0.5) 10 bits FADC for long duration pulse Neutrino energy 10 7 (SNs) ev is detectable. One string is installed at January, 2005, and taking data. IceCube ν μ IceTop AMANDA II μ 1km 3

4 Calibration PMTs and Digital Optical Modules (DOMs) Calibration IceCube detector is difficult once installed. (flusher and atom. neutrino) Calibration detectors before the installation is important. We calibrate PMTs and DOMs. (Absolute calibration and 2D sensitivity scan.) PMT DOM metal cage HV board Flasher board Main board 10 inch PMT Optical gel Hamamatsu Chiba Univ. Wisconsin Univ. Chiba Univ. South Pole makes all PMTs Normal check: (1/10) Linearity the PMT gain dark noise rate charge resolution Golden PMTs: (1/60) normal check + 2D sensitivity scan Absolute calibration assembles DOMs Golden DOMs: (1/80) check all DOMs 2D sensitivity scan (under low temperature) Absolute calibration Linearity the DOM gain dark noise rate component check cold reboot communication test

5 The absolute calibration PMTs and DOMs using Rayleigh scattering in N 2 air CRAY system by N. Sakurai N 2 laser (337nm) N 2 N 2 laser QE = ph.e.s / photons The Rayleigh scattering is well understood!

6 The measured absolute Q.E. a DOM POS.1 POS.2 DOM surface ~2cm POS.1 Shino_Inuzuka Photo-cathode direction POS.3 Q.E. POS.2 POS.3

7 Let me remind 337nm Transmission glass and gel (MC based on measurement) about consistent with the PMT QE (~20%) Using the difference, we can study the effect the glass and gel more.

8 The relative sensitvity 2D scan DOMs To get the 2D absolute sensitivity DOMs, combining with the result the absolute measurement. Are there sensitivity back side? Study the effect the glass and gel.

9 Dosetsu_Inuyama PMT DOM Size a PMT Preliminary! Consistent? Study the glass and gel

10 The PMT and DOM calibration schedule (PY05) PMT DOM DOM 2005, 12 PMTs calibration Ship PMTs to Wisconsin Calibrate golden DOMs Ship golden DOMs to Chiba Calibrate golden DOMs Ship golden DOMs to the south pole 2006,

11 Stware for EHE analysis JULIeT EHE propagator Photonics Cherenkov ROMEO Detector (PMT) DOM Sim Detector (Electronics) Now, the stware to generate MC is ready. Analysis (Event reconstruction)

12 10 15 ev ev ev ev ev ev

13 Results Down-going noise noise signal signal The proper reconstruction the energy and direction is important!

14 High Energy data analysis schedule (PY05) Analysis Pole Data MC Reco R&D Production by Ice3sim v1.1 Production by Ice3sim v1.2 Systematic Study 2005,Dec 2006,Jan. Feb. Mar. Apr. May. Jun. Jul. We will have ~10 more strings, so, let us hope some physics results!

15 Backup

16 Summary One string has installed last season. At Chiba university, we are working both on hardware and stware side mainly for EHE neutrinos. We calibrate PMTs and DOMs (2D absolute). The MC stware to study EHE neutrinos are ready. The future plan In this austral summer, we will (hopefully) deploy 10 more strings. We will continue to calibrate PMTs and DOMs. We will refine our analysis and upgrade devices. We will start mass production MC events and will develop a reconstruction method for the EHE neutrino events. We will also prepare to analyze observational data after the deployment this season. Let us hope some physics next year!