Speaker
Nahee Park
(Ewha University)
Description
The Cosmic Ray Energetics And Mass (CREAM) balloon-borne experiment is
designed for direct measurement of high-energy cosmic-ray particles. The
science goal is to measure the single-element fluxes of all cosmic-ray nuclei
from hydrogen (protons) to iron with energies up to the ”knee”, or spectral
index change, near 10 15 eV observed in the all-particle spectrum. A dual
layer Silicon Charge Detector (SCD-II) was designed for precise charge
measurement of incident nuclei. Each SCD-II layer consists of 26 ASIC
boards and 182 silicon sensors covering an active area of 77.9 x 79.5 cm 2 .
Each sensor is comprised of a 4 x 4 array of single-sided DC type silicon
pixels with an active area of 2.1 cm 2 . The detector was launched as part of
CREAM-II on December 16th, 2005, stayed at float for 28 days, and was
recovered successfully. The SCD-II was refurbished for the 3rd CREAM flight
planned for December 2007, and tested at CERN October 2006. The
construction and the beam test results of the SCD-II are reported.
Primary author
Nahee Park
(Ewha University)
