Cosmic Ray Energetics And Mass
Launched from Antarctica on Dec 16, 2004
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
1
Jan 28, 2005
• CREAM can measure individual energy
spectra and elemental composition of
cosmic rays ( 1 = Z = 26 and above)
from 1 TeV up to 1000 TeV
Cosmic Ray Energetics And Mass
• search for a cutoff in the proton
spectrum around 100 TeV
• expected to reach 500 TeV with 30%
statistical accuracy with 3 flights
• measurement of B/C ratio up to 500
GeV/n (test of propagation models)
Cosmic Ray Energetics And Mass
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
2
Jan 28, 2005
TRD Module
Calorimeter Module
CDM
Solar Array
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
3
Jan 28, 2005
Exploring Supernova Acceleration Limit
Scintillating
fiber
hodoscope
Silicon
Charge
Detector
Calorimeter Module
• The Silicon Charge Detector (SCD)
provides particle charge identification
Carbon
Targets
Tungsten
Calorimeter
• The 20-layer tungsten-scintillating
fiber calorimeter provides its own event
trigger and x,y,z tracking coordinates
• The scintillating fiber hodoscope
provides x,y tracking coordinates at fixed
z above the calorimeter
Calorimeter Science Objectives
• The Figure (left) shows p and He spectra measurements
with the Calorimeter as expected from a 40-day flight
• Simultaneous measurements of Z > 3 particles provides
inflight cross calibration of Calorimeter and TRD
Comparison of Calorimeter data (red squares) for
protons (upper) and Helium (lower) with prior data
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
4
Jan 28, 2005
What is the history of cosmic rays in the Galaxy ?
Timing
Charge
Detector
Transition
Radiation
Detector
TRD Module
TRD Science Objectives
• The Timing Charge Detector (TCD) provides event trigger
and particle charge identification. The TCD has 2 layers of 4
paddles each.
• The Transition Radiation Detector (TRD) has 2 modules
separated by a Cherenkov threshold counter
University of Siena
Siena - Gruppo Collegato
• The above figure compares TRD
data expected from a 40-day flight
(black circles) with prior data
• The TRD is expected to provide
the first B/C ratio in this energy
range in more than a decade
P .S. Marrocchesi
Slide
5
Jan 28, 2005
Launch operations
University of Siena
Siena - Gruppo Collegato
Dec 16, 2004
P .S. Marrocchesi
Slide
6
Jan 28, 2005
Altitude history
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
7
Jan 28, 2005
CREAM Flight Operation
IRIDIUM
ARGOS
Cosmic
GPS Ray
Energetics And Mass
TDRSS
LOS
ROCC
Science
on the ICE
University of Siena
Science
Operation
Center
UMD
Siena - Gruppo Collegato
OCC
Palestine
ESC
WFF
S-band Cmd
S-band tlm
P .S. Marrocchesi
WSC
Slide
8
Jan 28, 2005
Temperature (C)
Thermal history
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
9
Jan 28, 2005
January 16, 2005
Break the record
of 31 days and 20
hrs
2
January 27, 2005
Landing 417 miles
from McMurdo
after 41 days and
21 hrs
1
3
December 16, 2004
CREAM is launched
from McMurdo
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
10
Jan 28, 2005
Instrument functions well
An example event: ~10 TeV Fe
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
11
Jan 28, 2005
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
12
Jan 28, 2005
Preliminary charge correlation in the Cherenkov and SCD
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
13
Jan 28, 2005
Very preliminary charge
distribution in SCD
Flight Data:
Very Preliminary
Charge Distribution
N
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
14
Jan 28, 2005
Very preliminary : energy deposit in
the calorimeter
(CAL + ZLO) .OR. (CAL + ZLO + ZHI) triggers
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
15
Jan 28, 2005
Recovery operations
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
16
Jan 28, 2005
CREAM
Two Instrument Suites
CREAM II
Cherekov
Charge
Detector
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
17
Jan 28, 2005
CREAM-II Calorimeter Calibration
at CERN, Sept. 2004
Particle Beam
University of Siena
Siena - Gruppo Collegato
P .S. Marrocchesi
Slide
18
Jan 28, 2005