Testing the HiRes Detector Simulation against UHECR Data

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Presentation transcript:

Testing the HiRes Detector Simulation against UHECR Data ICRC 2003 in Tsukuba Testing the HiRes Detector Simulation against UHECR Data Andreas Zech ( Rutgers University) for the HiRes - Fly´s Eye Collaboration

HiRes Collaboration University of Tokyo University of Adelaide N. Manago, M. Sasaki University of Tokyo T. Abu-Zayyad, J. Albretson, G. Archbold, J. Balling, K. Belov, Z. Cao, M. Dalton, A. Everett, J. Girard, R. Gray, W. Hanlon, P. Hüntemeyer, C.C.H. Jui, D. Kieda, K. Kim, E.C. Loh, K. Martens, J.N. Matthews, A. McAllister, J. Meyer, S.A. Moore, P. Morrison, J.R. Mumford, K. Reil,R. Riehle, P. Shen, J. Smith, P. Sokolsky, R.W. Springer, J. Steck, B.T. Stokes, S.B. Thomas, T.D. Vanderveen, L. Wiencke University of Utah J. Amann, C. Hoffman, M. Holzscheiter, L. Marek, C. Painter, J. Sarracino, G. Sinnis, N. Thompson, D. Tupa Los Alamos National Laboratory J.A. Bellido, R.W. Clay, B.R. Dawson, K.M. Simpson University of Adelaide J. Boyer, S. Benzvi, B. Connolly, C. Finley, B. Knapp, E.J. Mannel, A. O’Neil, M. Seman, S. Westerhoff Columbia University J. Belz, M. Munro, M. Schindel Montana State University G. Martin, J.A.J. Matthews, M. Roberts University of New Mexico D. Bergman, L. Perera, S. Schnetzer, G.B. Thomson, A. Zech Rutgers University

The HiRes FADC Detector (HiRes-2) The newer one of the 2 HiRes air fluorescence detectors 2 rings with 21 mirrors each Located on Camel’s Back Ridge in Dugway (Utah) Started taking data in fall 1999

The HiRes FADC Detector (HiRes-2) 256 photomultiplier tubes per mirror. Flash ADC electronics record at a frequency of 10 MHz.

The Role of Monte Carlo Simulations in the HiRes Experiment We need M.C. to calculate the acceptance of our detectors for the flux measurement: M.C. is also a powerful tool for resolution studies and for tests of our reconstruction programs. This requires a simulation program that describes the shower development and detector response as realistically as possible. We want our code to simulate events under the exact data-taking conditions.

M.C. Input Energy & Composition The Fly’s Eye Stereo spectrum is used as an input for the M.C. The composition is chosen from our HiRes Stereo and HiRes/MIA measurement.

CORSIKA Shower Library (proton & iron) Fit parameters scale with primary energy: Gaisser-Hillas fit to the shower profile:

Adding Noise to the M.C. Ambient light level (low amplitude) can be measured from the width of the FADC pedestals. FADC counts in all trigger channels black: data red: M.C. total noise tubes distribution black: data red: M.C. Additional sky noise (high amplitude) is added to the M.C. to get agreement with data of a certain period.

A few Data / Monte Carlo Comparisons or: Testing how well we understand our experiment ... HiRes-2 data shown from 12/99 until 09/01. ~ 556 Hours of good weather data. average atmosphere used for consistency with HiRes-1. Statistics: rec. geometry: 6309 events after all cuts: 2274 events M.C. : ~ 4 x data statistics

Signal tubes / χ of linear time fit 2

Light per Track Length / Čerenkov Fraction

Rp / Rp Resolution

Energy / Energy Resolution

HiRes-2 Exposure Flux:

HiRes-2 Energy Spectrum HiRes-2 data from 12/’99 until 09/’01

HiRes Mono Energy Spectra HiRes-1 data from 06/’97 until 02/’03 HiRes-2 data from 12/’99 until 09/’01

Conclusions Our data analysis relies on a realistic M.C. simulation for the aperture calculation and for resolution studies. We have generated air showers and detector response for the HiRes FADC detector under the exact data-taking conditions. We have tested our simulation successfully against data taken by HiRes-2. Our M.C. simulation provides a realistic and detailed model of our experiment.