Difference between revisions of "DU data"

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Current ~ 160 mA
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Pulse width ~ 2 ns
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Rep rate ~ 180 Hz
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Electron energy ~ 25 MeV
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Two thicknesses of Al brem radiator were used (A) 10 um for 10% of the beam time, (B) 25 um for 90% of the beam time.
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==Relative photon flux monitoring. Beam up. DU target==
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[[File:flux_DU_r2462.png | 400 px]]
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[[File:flux_DU_r2467.png | 400 px]]
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[[File:flux_DU_r2474.png | 400 px]]
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[[File:flux_DU_r2491.png | 400 px]]
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[[File:flux_DU_r2494.png | 400 px]]
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[[File:flux_DU_r2495.png | 400 px]]
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[[File:flux_DU_r2496.png | 400 px]]
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[[File:flux_DU_r2502.png | 400 px]]
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[[File:flux_DU_r2506.png | 400 px]]
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[[File:flux_DU_r2509.png | 400 px]]
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[[File:flux_DU_r2510.png | 400 px]]
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[[File:flux_DU_r2517.png | 400 px]]
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[[File:flux_DU_r2521.png | 400 px]]
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[[File:flux_DU_r2522.png | 400 px]]
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==Relative photon flux monitoring. Beam down. DU target==
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[[File:flux_DU_r2461.png | 400 px]]
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[[File:flux_DU_r2466.png | 400 px]]
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[[File:flux_DU_r2475.png | 400 px]]
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[[File:flux_DU_r2489.png | 400 px]]
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[[File:flux_DU_r2498.png | 400 px]]
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[[File:flux_DU_r2504.png | 400 px]]
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[[File:flux_DU_r2507.png | 400 px]]
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[[File:flux_DU_r2511.png | 400 px]]
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[[File:flux_DU_r2519.png | 400 px]]
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[[File:flux_DU_r2523.png | 400 px]]
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[[File:flux_DU_r2524.png | 400 px]]
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==Beam UP configuration==
 
==Beam UP configuration==
  
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[[File:DU_de_nene_cumul_DOWN.png | 800 px]]
 
[[File:DU_de_nene_cumul_DOWN.png | 800 px]]
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==Asymmetry. 4 channel binning of the neutron energy spectrum==
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The sum of the number of neutrons in three detectors placed at 0 deg left, 90 deg bottom and 0 deg right was used to do the narmalization for both beam UP and DOWN configurations, i.e. the procedure that takes into account possible photon flux change. For the justification of the normalization procedure see [https://wiki.iac.isu.edu/index.php/Photon_flux_proportionality]
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[[File:DU_4ch_asymm.png | 800 px]]
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==Asymmetry. 8 channel binning of the neutron energy spectrum==
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[[File:DU_8ch_asymm.png | 800 px]]
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==Running asymmetry. High-to-low neutron energy binning==
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The asymmtry was measured starting with 8 MeV as a maximum bin number and then adding 1 MeV the asymmetry was measured for the whole neutron energy spectrum finally (point at zero MeV)
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[[File:DU_HtL_RunAsymm.png | 800 px]]

Latest revision as of 20:27, 11 June 2013

Current ~ 160 mA

Pulse width ~ 2 ns

Rep rate ~ 180 Hz

Electron energy ~ 25 MeV

Two thicknesses of Al brem radiator were used (A) 10 um for 10% of the beam time, (B) 25 um for 90% of the beam time.

Relative photon flux monitoring. Beam up. DU target

Flux DU r2462.png

Flux DU r2467.png

Flux DU r2474.png

Flux DU r2491.png

Flux DU r2494.png

Flux DU r2495.png

Flux DU r2496.png

Flux DU r2502.png

Flux DU r2506.png

Flux DU r2509.png

Flux DU r2510.png

Flux DU r2517.png

Flux DU r2521.png

Flux DU r2522.png


Relative photon flux monitoring. Beam down. DU target

Flux DU r2461.png

Flux DU r2466.png

Flux DU r2475.png

Flux DU r2489.png

Flux DU r2498.png

Flux DU r2504.png

Flux DU r2507.png

Flux DU r2511.png

Flux DU r2519.png

Flux DU r2523.png

Flux DU r2524.png

Beam UP configuration

Cumulative raw ToF spectra obteined for the case of DU target and beam UP position are presented below:

DU raw cumul UP.png

The width of the photon peak (sigma) shows the IAC linac pulse width at it was mentioned above it was around 2 ns.

Neutron energy spectra reonstructed from the ToF spectra for the beam UP and DU are shown below:

DU nene cumul UP.png

The neutron detectors was placed azimuthally symmetric around the target so the distance was 135.5 cm from the center of the target to the face of each of the detector.

The uncertainty on the neutron energy depends mostly on the knowledge of the photon peak center position. The width of the photon peak gives an uncertainty in the neutron energy.

The energy uncertainty for the beam UP and DU target are shown below:

DU de nene cumul UP.png

Beam DOWN configuration

Cumulative raw ToF spectra obteined for the case of DU target and beam DOWN position are presented below:

DU raw cumul DOWN.png

The width of the photon peak (sigma) shows the IAC linac pulse width at it was mentioned above it was around 2 ns.

Neutron energy spectra reonstructed from the ToF spectra for the beam DOWN and DU are shown below:

DU nene cumul DOWN.png

The neutron detectors was placed azimuthally symmetric around the target so the distance was 135.5 cm from the center of the target to the face of each of the detector.

The uncertainty on the neutron energy depends mostly on the knowledge of the photon peak center position. The width of the photon peak gives an uncertainty in the neutron energy.

The energy uncertainty for the beam DOWN and DU target are shown below:

DU de nene cumul DOWN.png

Asymmetry. 4 channel binning of the neutron energy spectrum

The sum of the number of neutrons in three detectors placed at 0 deg left, 90 deg bottom and 0 deg right was used to do the narmalization for both beam UP and DOWN configurations, i.e. the procedure that takes into account possible photon flux change. For the justification of the normalization procedure see [1]

DU 4ch asymm.png

Asymmetry. 8 channel binning of the neutron energy spectrum

DU 8ch asymm.png

Running asymmetry. High-to-low neutron energy binning

The asymmtry was measured starting with 8 MeV as a maximum bin number and then adding 1 MeV the asymmetry was measured for the whole neutron energy spectrum finally (point at zero MeV)

DU HtL RunAsymm.png