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Файл:Антарктида (3 сем, мага) / MEPhI_LDB_talk_7_09_2023
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BOOMERanG LDB experiment
Balloon Observations Of Milimetric Extragalactic Radiation and Geophysics
First high precision CMB temperature anisotropy measurement!
CMB anisotropy measured
by BOOMERanG. Data from
1998 flight in Antarctica.
7th September 2023 LDB Astrophysics in Antarctica 11
BESS LDB experiment
Balloon-borne Experiment with Superconducting Spectrometer.
Best Cosmic Antimatter Flux limit measurement before the AMS-02!
All LDB experiments
Anti-helium flux limits
compared to AMS-01,
and AMS-02 data
7th September 2023 LDB Astrophysics in Antarctica 12
ANITA LDB experiment
Antarctic Impulsive Transient Antenna
Ultra High Energy Neutrino search with sensitivity up to 1021 eV
Askaryan radiation from
UHEN induced showers
in the Antarctic ice
7th September 2023 LDB Astrophysics in Antarctica 13
Cosmic Ray Energy and Mass (CREAM)
Experiment
The CREAM is designed to measure cosmic ray elemental spectra using a
series of Long Duration Balloon (LDB) flights. The goal is to extend
direct measurement of cosmic-ray composition to the energies capable of
generating gigantic air showers which have been mainly observed on the
ground, thereby providing calibration for indirect measurements.
The instrument has redundant, complementary charge identification and the
energy measurement systems capable of precise measurements of elemental
spectra for Z = 1 - 26 nuclei, over the energy range ~1011 to ~1015 eV. Precise
measurements of the energy dependence of elemental spectra at the highest
of these energies, where the rigidity-dependent supernova acceleration limit
could be reflected in a composition change, provide a key to understanding
cosmic ray acceleration and propagation.
7th September 2023 LDB Astrophysics in Antarctica 14
CREAM-I instrument configuration
TCD - Timing based Charge Detector:
Plastic scintillation counters with fast
PMT readout Triggers & identifies charged
particles
TCD
S3
TRD-I
TRD-I
CD
T1
T2
Calorimeter
CDM
SCD
TRD-I - Transition Radiation Detector:
512 Gas straw tubes, Xe/CH4 95/5%,
Ethafoam-220 polyethylene TR radiator.
Energy / Lorentz factor measurement
for the relativistic charged particles.
CD - Cherenkov Detector:
Plastic Cherenkov counter
Triggers relativistic charged particles
SCD - Silicon Charge Detector:
Measures particle charge.
S3 - Scintillating fiber counter:
Triggers charged/shower particles
Calorimeter:
Tungsten / Scintillating fiber sampling
calorimeter with T1,T2 carbon targets.
Triggers interacting high energy particles,
measures energies of incident particles
7th September 2023 LDB Astrophysics in Antarctica 15
CREAM Silicon Charge Detector
SCD contains 2 m2 of silicon pixels
7th September 2023 LDB Astrophysics in Antarctica 16
CREAM Calorimeter
Tungsten/Scintillating fiber sampling calorimeter
20 x 1X0 layers
HPD sensors
200K dynamic range.
2560 channels
Carbon target
Calorimeter stack
Readout clear fiber bundles
7th September 2023 LDB Astrophysics in Antarctica 17
Beam calibrations at SPS H2 line
CAL / S3 / C-Target /
SCD
Trigger counters 2x2 cm CREAM detectors on the moving tableSi Beam
Trackers
The beam calibrations are performed annually before each CREAM mission
7th September 2023 LDB Astrophysics in Antarctica 18
Calorimeter tests at SPS H2 beam
Offset 1% at 200 GeV/c w/o calibration
Electrons
Calorimeter position response
uniformity w/o calibration has
typical RMS of 4%. A precision
beam calibration to 0.1% is needed
for each flight.
7th September 2023 LDB Astrophysics in Antarctica 19
Before the T/V test at GSFC, NASA
CREAM Science compartment
7th September 2023 LDB Astrophysics in Antarctica 20
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