AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
BRIKEN
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Entry time:
Fri Nov 4 13:16:42 2016
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Beam tuning in BigRIPS At 19:00 access to Exp. Area was closed and the tuning of BigRips started. Unfortunately the 252Cf was left on the table close to the stairs and cannot be removed until 23:00. We did a background measurement Start: 19:00 Stop: 22:18 File: 161104_2218_BeamTuning.root In the attached figure 1 one can see a plot of the rate (neutrons/10s) in the BRIKEN detector during this time The rate was at high as 150n/s during this period. We estimate that the influence of the 252Cf source is about 15n/s (corresponds to the lowest rates) Also attached are pictures of the Top and Bottom plastic veto detectors mounted just above and below the hole in the shielding. Interestingly the bottom sees less counts at high energy and this could be related to the 10cm lead wall raised before the degrader to protect AIDA that covers only partially the top detector. Also attached is the neutron spectrum for the different rings superposed. (ROOT color code)
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