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Дата изменения: Tue Feb 15 16:50:43 2000
Дата индексирования: Mon Oct 1 22:03:53 2012
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The Satellite Telescope of Electrons and Protons STEP
The Satellite Telescope of Electrons and Protons STEP
 
The main characteristics of charged particle spectrometer "STEP"
 
Objective Precision measurements of the energy, angular, and time distributions in precipitating fluxes of high-energy charged particles with solar, magnetospheric, and anomalous cosmic rays origin.
Structure Two external detecting blocks named "STEP-DI" and "STEP-DII" with mutually perpendicular arrangement and a signal processing block named "STEP-E", located inside satellite.
Construction Both "STEP-DI" and "STEP-DII" have an identical construction of large solid angle telescope from 4 detectors (D1-D4), first 2 of which (D1-D2) are position-sensitive silicon strip-detectors; both D3 and D4 are scintillation CsI(Tl) detectors.
Operation Identification of registered particle and determination of its kinetic energy by means of dE/dx-E method with simultaneous trajectory definition via coordinates of passage through position-sensitive detectors.
Specifications Each detecting block field of view, degree : 97 x 97
Average on the field of view angular resolution: 8 deg
The active area of detectors: D1, D2: 
 
                                                D3: 

                                                D4:

 20 sq. cm 

36 sq. cm 

49 sq. cm
Energy resolution : D1 , D2: 

                              D3, D4: 

 about 70 keV 

15% or better
Overall dimensions of block «STEP-D»: 

                                            «STEP-E»:

 200x186x175 (mm) 

250x150x220 (mm)
Gross weight of "STEP-DI", "STEP-DII" and "STEP-E": 13 kg
Design total power: 16 Watt
 
Simultaneously sold modes of the device response
  
The Logic of Events Selection*
The Energy Interval of Registered Particles (MeV)**
Typical Geometry Factor
( sq. cm sr) *** 
What is Measured
Electrons: 0.15 - 0.29
Protons: 4.0 - 8.0
Alphas: 14.0 - 32.0
71
 The intensity of each sort low-energy particles in the full field of view
Electrons: 0.29 - 0.37
Protons: 8.0 - 11.0
Alphas: 32.0 - 44.0
56
 Both energy and angular distribution of each sort low-energy particles
Electrons: 0.37 - 9.7
Protons: 11.0 - 61.0
Alphas: 44.0 - 244.0
85 - 70
  Both energy and angular distribution of each sort  particles in 10 differential energy channels
Electrons: > 9.7
Protons:    > 61.0
Alphas:   > 244.0
100
 The angular distribution and total intensities of high-energy particles 
 
* The feature like  means logical complement (anticoincidence).

** Calculated meanings, received in assumption of zero discrimination level and absence of "dead zones" in detectors.

*** Based on calculations with straight tracks.

The values of the geometrical factors and energy interval borders are supposed to be finally specified by special calibration measurements.