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Entry time:
Tue Apr 21 09:39:00 2015
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[UPDATED 22/4: initial LISE file had incorrect thickness for MACi plastic] Calculations for Al degrader thickness required to implant ions in AIDA DSSD stack. Calculations are based on LISE files from main experiment, and done for settings with expected longest and shortest range of ions before implantation setup: - LISE++ for the 95Br BigRIPS setting : B1_U_BefissionZDSLAA_95Br_6mmF1.lpp - LISE++ for the 85Ga BigRIPS setting : B1_U_BefissionZDSLAA_85Ga_6mmF1.lpp Setup after last beamline detector (IC): 180cm Air + Al degrader + MACi (7mm plastic@45 degrees) + AIDA (3mm silicon) + thick Al plate (1 cm). + 84Zn setting (long range): - Al degrader of 1 mm required in front of implantation setup to stop 84Zn activity in AIDA (end of stack). The range in Si is reduced by ~1.1 mm per each mm of Al added in degrader. - Activity from heavier (more intense) isotopes seems to be implanted at similar location as more exotic isotopes (always considering 1p knockout channel, might be worth looking also at unreacted channels). + 94Se setting (short range): - Activity stopped before AIDA. We'll need to remove MACi if we want ions implanted in AIDA (unless the tail of energy distribution after secondary target is very large). - If we remove the MACi plastic, we would need 2 to 3 mm of Al degrader to stop ions in AIDA (assuming the 1mm veto after segmented MACi plastics remain). See attachments for detailed description
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Attachment 1:
LISE_estimates_84Zn.docx
Attachment 2:
LISE_estimates_94Se.docx
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