ELOG AIDA

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

AIDA

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Entry time:	Sat Mar 29 12:27:57 2025
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> Offline analysis of AIDA data files R25_11 to R25_23 using MIDASsort > > Note > > - no calibration (raw ADC data only) > - no thresholds > - no clustering > - events delimited by > 2us time difference between successive ADC data words > AIDA data files R25_11 to R25_23 inclusive contain 410.3M events > - HEC = high energy channel = 20GeV FSR range for high energy implants > - LEC = low energy channel = 20MeV FSR range for decays (and pulser) > - see attachment 20 prelimnary analysis of R25_11 to R25_23 by Tain et al. of 21.11.16 > > > Attachments 1 & 2 > ----------------- > s1-s24 per FEE64 # ADC data per 20.48us > s101-s124 per FEE64 # disc hits per 20.48us > > Pulser event demonstrates that all FEE64s timestamps are synchronised > > > Attachments 3 & 4 > ----------------- > s301-s306 per DSSSD LEC rate (Hz) updated every 1s > s307-3312 per DSSSD HEC rate (Hz) updated every 1s > > Demonstrates implant and decay rates were reasonably constant. > Note that there is an integerisation issue in the rate calculation which > means rate is shown as zero periodically. > > > Attachment 5-8 > -------------- > s2000-s2005 per DSSSD LEC m_lec_p versus m_lec_n > > following spectra require 0 < m_lec_p < 8 and 0 < m_lec_n < 8 > all combinations of x & y plotted > > s2010-s2015 per DSSSD LEC x versus y > s2020-s2025 per DSSSD LEC E_p versus E_n (10keV/ch nominal) > s2030-s2035 per DSSSD LEC-LEC time (2.56us/channel) > > Demonstrates large LEC multiplicities associated with HEC events but relatively > low multiplicities associated with LEC-only events . > > Minimum LEC-LEC time difference c. 1 x 2.56us = 2.56us which suggests events > with low LEC-LEC time difference are non-stochastic and suggests EMI/RFI noise > causing 'multiple' event bursts. This will likely be dominated by channels > 0-1 (say) and 60-63 (say) of each FEE64 - disabling these channels may a quick > and dirty way to inspect a subset of data with significantly less EMI/RFI noise > > Time difference between successive LEC events > > DSSSD centroid =>rate (kHz) > 1 21.16 18.5 > 2 17.45 22.4 > 3 40.27 9.70 > 4 50.86 7.68 > 5 58.11 6.72 > 6 29.33 13.3 > > Which somewhat over-estimates observed rates (see below) > > Periodic fine structure observed with period ~4-16 channel (~10-40us) > > Attachment 9-13 > --------------- > s2000-s2005 per DSSSD LEC m_hec_p versus m_hec_n > > following spectra require 0 < m_hec_p < 8 and 0 < m_hec_n < 8 > all combinations of x & y plotted > > s2010-s2015 per DSSSD HEC x versus y (semi-log and linear z normalisation) > s2020-s2025 per DSSSD HEC E_p versus E_n (10MeV/channel nominal) > s2030-s2035 per DSSSD HEC-HEC time (2.56us/channel) > > Demonstrates relatively low multiplicities associated with HEC events > > HEC x versus y spectra are different to those shown by Tain et al. (p.4) > => BigRIPS PID gate used? > what is the origin of the fine structure observed by Tain et al. (p.4)? > > No obvious structure in the time between successive HEC events > - see also https://elog.ph.ed.ac.uk/AIDA/457 > - minimum time between successive HEC events c. 16 x 2.56us = 41us which is > consistent with HEC (+LEC) multiplicity per ASIC and ASIC shaping time (8us) > > Note Tain et al. (p.3) plot time between successive events with no restriction on type > (LEC or HEC). The time structure(s) observed may therefore be related to LEC events > > Time difference between successive HEC events > > DSSSD centroid =>rate (Hz) > 1 2566.44 152.0 > 2 2970.33 131.5 > 3 2557.81 152.7 > 4 2622.38 149.0 > 5 3656.82 106.8 > 6 15706.73 24.9 > > Which somewhat over-estimates observed rates (see below) > > > Attachment 14-16 > ---------------- > s2200-s2205 per pixel, per DSSSD HEC-LEC time (2.56us/channel) > > Minimum HEC-LEC time difference c. 15 x 2.56us = 38.4us which is consistent > with ASIC shaping and readout times. > > In comparison to Tain et al. (p.9) no obvious structures at large > HEC-LEC time differences. Significant number of excess events observed > at HEC-LEC time differences ~ few hundred us. This is likely due to > the 100kHz EMI/RFI noise observed. > > Attachments 17-19 > ----------------- > > MIDASsort Fortran source, spectrum titles, and namelist I/O variables (in this > case principally FEE64 mapping and default ADC gain/offset values). > > S O R T C O M P L E T E ..... Tue Nov 22 20:20:10 2016 > > > * ENTRY finish > > * data items: -900823296 ( -37356.59 Hz) > * ADC events: 410276049 ( 17013.89 Hz) > * time warps: 0 ( 0.00 Hz) > * DSSSD # 1 count: 56031017 old count: 56019099 dt: 3505.73 s LEC rate: 15982.71 Hz > * DSSSD # 2 count: 49362481 old count: 49350664 dt: 3505.73 s LEC rate: 14080.52 Hz > * DSSSD # 3 count: 33599202 old count: 33591614 dt: 3505.73 s LEC rate: 9584.09 Hz > * DSSSD # 4 count: 26666285 old count: 26660843 dt: 3505.73 s LEC rate: 7606.49 Hz > * DSSSD # 5 count: 23365594 old count: 23360881 dt: 3505.73 s LEC rate: 6664.98 Hz > * DSSSD # 6 count: 42705054 old count: 42696091 dt: 3505.73 s LEC rate: 12181.51 Hz > * DSSSD # 1 count: 469505 old count: 469407 dt: 3505.73 s HEC rate: 133.93 Hz > * DSSSD # 2 count: 404352 old count: 404269 dt: 3505.73 s HEC rate: 115.34 Hz > * DSSSD # 3 count: 468569 old count: 468472 dt: 3505.73 s HEC rate: 133.66 Hz > * DSSSD # 4 count: 455030 old count: 454982 dt: 3505.73 s HEC rate: 129.80 Hz > * DSSSD # 5 count: 326872 old count: 326863 dt: 3505.73 s HEC rate: 93.24 Hz > * DSSSD # 6 count: 65691 old count: 65690 dt: 3505.73 s HEC rate: 18.74 Hz > > * ENTRY finish ends > > S O R T S T O P P E D ..... 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