Difference between revisions of "2n preliminary data analysis"

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Line 46: Line 46:
 
Detector layout:
 
Detector layout:
  
−
[[File:Detlayout.png]]
+
[[File:Detector_layout2.png]]
 +
 
 +
Geant4 setup:
 +
 
 +
[[File:geant_setup.eps | 600 px]]
 +
 
 +
Solid angles subtended by the detectors and defined by point source (second column) and volume source filled with deuterium and 1 MeV neutrons were generated through all the volume isotropically (third column):
 +
{|class="wikitable1"
 +
|Det E ||
 +
|0.106 ||
 +
|0106
 +
|sr
 +
|-
 +
|Det M ||
 +
|0.118 ||
 +
|0.119
 +
|sr
 +
|-
 +
|Det F ||
 +
|0.096 ||
 +
|0.094
 +
|sr
 +
|-
 +
|Det G ||
 +
|0.063 ||
 +
|0.061
 +
|sr
 +
|-
 +
|Det H ||
 +
|0.033 ||
 +
|0.031
 +
|sr
 +
|-
 +
|Det K ||
 +
|0.019 ||
 +
|0.018
 +
|sr
 +
|-
 +
|Det I ||
 +
|0.011 ||
 +
|0.011
 +
|sr
 +
|}
 +
 
  
 
Calibration of detector array efficiency via D2O photodisintegration (run 4111):
 
Calibration of detector array efficiency via D2O photodisintegration (run 4111):
Line 56: Line 99:
 
[[File:D20_eff_calibr2.png | 600 px]]
 
[[File:D20_eff_calibr2.png | 600 px]]
  
−
Jitter of the PS detector and "Ilyusha" (placed on the beam) w.r.t. the gun trigger signal for run 4112:
+
Jitter of the PS detector and "Ilyusha" (placed on the beam) w.r.t. the gun trigger signal (run 4112):
  
 
[[File:Jitter.png | 600 px]]
 
[[File:Jitter.png | 600 px]]
 +
 +
H2O calibration run (run 4112):
 +
 +
[[File:H20_eff_calibr1.png | 600 px]]
 +
 +
And the rest of the detectors:
 +
 +
[[File:H20_eff_calibr2.png | 600 px]]
 +
 +
Run with MT target (run 4113):
 +
 +
[[File:MT_calibr1.png | 600 px]]
 +
 +
And the rest of the detectors:
 +
 +
[[File:MT_calibr2.png | 600 px]]
 +
 +
Thick U-target data (run 4118):
 +
 +
[[File:r4118_1.png | 600 px]]
 +
 +
And the rest of the detectors:
 +
 +
[[File:r4118_2.png | 600 px]]
 +
 +
Neutron data bank (two production runs 4118 and 4119 added together). Coincidences between two PMTs for each detector are shown below.
 +
 +
[[File:neutron_bank.png | 600 px]]
 +
 +
 +
'''Some simulation'''
 +
 +
Neutron energy and neutron polar angular distribution from D2O photodisintegration by unpolarized bremmstrahlung photons with end point energy 10.5 MeV were simulated by G4.
 +
 +
Bremsstrahlung photon spectrum:
 +
 +
[[File:brem_spectrum.png | 600 px]]
 +
 +
Neutron energy spectrum w/o target material effect:
 +
 +
[[File:Neutron_simulation.png | 600 px]]
 +
 +
Neutron polar angular distribution. Zero degree is the initial incident photon direction:
 +
 +
[[File:Neutron_polar_ang_simulation.png | 600 px]]

Latest revision as of 04:20, 20 August 2012

Data on [math]MT target/D_2O[/math]:

Run with 2 Al sheets (2x0.678 mm) as bremsstrahlung converter w/o hardener. [math]E_e = 10.5 MeV[/math], Detector G(1/left).

D2OMTT.jpg

Bin-by-bin subtraction of the two timing spectra after normalization:

Subtr D2OMTT.jpg

Data on thick U-target and D2O from 8/13/2012:

Data (detector G(1,2)) were normalized to the gun trigger signal. Runs 3999(D2O) and 4001(no target), and 4011(thick U-target) and 4012(no target).

D2OMTT2.png

ThickUtarg.png


Data on thick U-target,D2O and H2O from 8/16/2012:

Data (detector F(1)) were normalized to the gun trigger signal. Runs 4097(D2O) and 4098(H2O), and 4011(thick U-target) and 4012(no target). [math]E_e = 10.5 MeV[/math]

D2OH2O.png

D2OMTT3.png

Data (detector H(2)) were normalized to the gun trigger signal. Runs 4100(thick U-taget) and 4099(MT target). [math]E_e = 10.5 MeV[/math]

ThickUtargMTtarget.png

Photon flux study.

The current we were running at (3 sheets of Al):

Photon fluxI.png

And when we asked the operator to cut the electron current twice, our photon flux monitor showed:

Photon fluxI half.png


Data on thick U-target,D2O and H2O from 8/17/2012:

Detector layout:

Detector layout2.png

Geant4 setup:

File:Geant setup.eps

Solid angles subtended by the detectors and defined by point source (second column) and volume source filled with deuterium and 1 MeV neutrons were generated through all the volume isotropically (third column):

Det E 0.106 0106 sr
Det M 0.118 0.119 sr
Det F 0.096 0.094 sr
Det G 0.063 0.061 sr
Det H 0.033 0.031 sr
Det K 0.019 0.018 sr
Det I 0.011 0.011 sr


Calibration of detector array efficiency via D2O photodisintegration (run 4111):

D20 eff calibr1.png

And the rest of the detectors:

D20 eff calibr2.png

Jitter of the PS detector and "Ilyusha" (placed on the beam) w.r.t. the gun trigger signal (run 4112):

Jitter.png

H2O calibration run (run 4112):

H20 eff calibr1.png

And the rest of the detectors:

H20 eff calibr2.png

Run with MT target (run 4113):

MT calibr1.png

And the rest of the detectors:

MT calibr2.png

Thick U-target data (run 4118):

R4118 1.png

And the rest of the detectors:

R4118 2.png

Neutron data bank (two production runs 4118 and 4119 added together). Coincidences between two PMTs for each detector are shown below.

Neutron bank.png


Some simulation

Neutron energy and neutron polar angular distribution from D2O photodisintegration by unpolarized bremmstrahlung photons with end point energy 10.5 MeV were simulated by G4.

Bremsstrahlung photon spectrum:

Brem spectrum.png

Neutron energy spectrum w/o target material effect:

Neutron simulation.png

Neutron polar angular distribution. Zero degree is the initial incident photon direction:

Neutron polar ang simulation.png

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