ELOG DESPEC

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

DESPEC

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Entry time:	Sat Aug 16 09:37:34 2025
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> Offline analysis of data files S505/R5_780 - R5_814 (corresponding to MBS data files 73-74) > > Can find an analysis of alpha background runs at RIBF, RIKEN for comparison at https://elog.ph.ed.ac.uk/AIDA/816 > > Beam off - background runs without sources > > MBS 73 27.6.22 09:33-11:33 CEST https://elog.gsi.de/despec/S505/204 > > MBS 74 27.6.22 11:34-13:34 CEST https://elog.gsi.de/despec/S505/206 > > MBS 75 27.6.22 13:35-16:29 CEST https://elog.gsi.de/despec/S505/209 > > ADC offsets per https://elog.ph.ed.ac.uk/DESPEC/556 > > FEE64 configuration > > FEE64 a b c d > DSSSD#1 3 4 1 2 > DSSSD#2 7 8 5 6 > > p+n junction FE64s odd numbered > > > Data analysis assumes > > - all LEC ADC data channels with valid ADC offset included (474 of 512 channels) > - no clustering > - no p+n junction side - n+n Ohmic side correlation time gates > - valid LEC events > 0 < p+n junction side multiplicity < 8 > and > 0 < n+n Ohmic side multiplicity < 8 > > > Attachments 1-2 - per DSSSD p+n versus n+n multiplicity > > Attachment 3 - per DSSSD x versus y > > Attachments 4-5 - per DSSSD p+n versus n+n energy (20keV/channel nominal) > all combinations of per DSSSD p+n junction and n+n Ohmic energies > with projection of data within window onto x and y axes > > too many events for natural (U decay series) background > off leading diagonal correlations anomalous > transverse width of leading diagonal correlation wider than expected - ADC offsets OK? > > > Attachment 6 - per FEE64 WR timestamp (32.768us/channel) > FEE64 sync test using pulser data - looks OK > > Attachments 7-14 - per FEE64 ADC spectra (5.6keV/channel nominal) > note common x/y scale - pulser peak height proxy for peak width > > per FEE64 1.8.L pulser peak widths (ch FWHM) > > 1 11.43 > 2 16.58 > 3 12.52 > 4 17.54 > 5 9.10 > 6 12.22 > 7 17.03 > 8 16.09 > > 3 of 4 p+n junction FEE64 good (<70keV), 1 of 4 n+n Ohmic FEE64 good - all others < 100keV > Pulser peak indicates noise/gain/offset stable throughout background runs > > > Attachments 15-22 - per FEE64 ADC spectra (5.6kleV/channel nominal) > observe broad peak-like structures (c. 2.8MeV) in first channel of most ASICs? > > Attachment 23 per DSSSD p+n versus n+n energy (20keV/channel nominal) > valid LEC events > p+n junction side multiplicity = 1 n+n Ohmic side multiplicity = 1 > > Attachment 24 p+n FEE64 #0 energy versus each of n+n FEE64s (#1, #3, #5 and #7) energies (20keV/channel nominal) > valid LEC events > p+n junction side multiplicity = 1 n+n Ohmic side multiplicity = 1 > > Attachments 23 & 24 do not unambiguously identify which FEE64s are attached to which DSSSD > Encoding: HTML ELCode plain Suppress Email notification

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