Gamma flash labr 3 and lacl 3
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Gamma Flash (LaBr 3 and LaCl 3 ). Emilio Mendoza Cembranos. Energy calibration. Calibration measurements at 0.1 V full range: LaCl 3 – 137 Cs-25, 88 Y-35,73  ~25 keV/channel LaBr 3 – 137 Cs-17, 88 Y-24,48  ~37 keV/channel

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Gamma Flash (LaBr 3 and LaCl 3 )

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Gamma Flash (LaBr3 and LaCl3)

Emilio Mendoza Cembranos


Energy calibration

Calibration measurements at 0.1 V full range:

LaCl3 – 137Cs-25, 88Y-35,73  ~25 keV/channel

LaBr3 – 137Cs-17, 88Y-24,48  ~37 keV/channel

Rest of measurements presented here with 1 V full range instead of 0.1 V  ~250, 370 keV/channel

Same voltage applied to the detectors


Example - normal proton intensity, with shifter

Always the same shape

Always a strange shape


Conclusions

  • At normal proton intensities, with shifter, the g-flash seems to saturate.

  • If the gamma flash saturates, the shifter makes something strange.

  •  Only runs without shifter can be considered.


Runs without shifter

“Good” statistics

No g-flash

Bad statistics


42 cm

22 cm

Corner


No shifter, normal intensity x0.1, 22 cm

20 MeV


No shifter, normal intensity x0.1, 22 cm

20 MeV


No shifter, normal intensity x0.1, 22 cm


No shifter, normal intensity x0.1, 22 cm

1 GeV

20 GeV

5 GeV


No shifter, normal intensity x0.1, 42 cm

1 GeV

20 GeV

5 GeV


No shifter, normal intensity x0.1, corner

1 GeV

20 GeV

5 GeV


No shifter, normal intensity x0.7, corner

1 GeV

20 GeV

5 GeV


No shifter, normal intensity x0.1, 22 cm

No g-flash

Saturated g-flash


No shifter, normal intensity x0.1, 42 cm

No g-flash

Saturated g-flash


No shifter, normal intensity x0.1, corner

No g-flash

Saturated g-flash


No shifter, normal intensity x0.7, corner

No g-flash

Saturated g-flash


LaBr3

LaCl3

LaBr3

LaCl3

LaBr3

LaCl3

LaBr3

LaCl3


Conclusions

  • More protons  more g-flash

  • For this measurements, the g-flash is compatible in all spatial positions.

  • In these measurements (nominal intensity x0.1) one or two particles deposit up to ~100 MeV (or more) in these detectors.

  • Information very limited: It would be nice to make extra measurements (low proton intensity + without shifter to compare with the simulations).


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