0055: Degrader changed. 1mm removed.
1.4mm total
0537: R38 ends nnaida11 slow comparator 0x20 -> 0x40 LEC fast comparator -> 0xff
0530: R39 10.00 AIDA status screenshots
1159: R39 ends HEC fast comparator 0x2 -> 0xf (all FEE64s)
1202: R40 nnaida8 no SYNCS see attachments 19-22
VFEP toggled merge pause state check merge activity spinner accelerates nnaida8 GO Electronics (from select required function menu of Run Control) nnaida8 started OK toggled merge pause state
1500: Attachments 23-28 show waveforms, low E and high E spectra for nnaida6+11.
Increasing fast comp threshold to 0xf shifts position of energy cut off away from zero point, as expected, but does not remove low E peak around ch 32500.
1530: Increase bias to +150V on det 1 (ch 1). Attachments 29-34 show waveforms, low E and high E spectra with increased bias voltage. Diode link threshold at 0x23
V high E events in .L spectra show reduction over those before bias increase.
In .H spectra from both nnaida6+11, increased bias reduced threshold. Finite threshold still seen on n-side however (greater than on p-side).
All references/comparisons in this ELog entry re. nnaida11 are w.r.t. to spectra/waveforms seen at this 'standard' setting.
1544: Changed diode link thresh on nnaida11 to 0x11. Attachments 35-37.
Saved run R42.
High energy spectra saw threshold increase of ~700ch, but no other changed were observed.
1555: Change nnaida11 diode link thresh to 0x29. Saved run R43. Attachments 38-40.
Saw reduction in high E threshold by ~700 ch but no other obvious changes.
1610: Changed diode link thresh on nnaida11 to 0x14 and preAmp reference to 0x20. Saved run R44. Attachments 41-44.
Waveforms look much worse, more flatlining that previously seen.
High E spectra show marginally higher threshold. No significant change in low E spectra.
1630: Changed nnaida11 preAmp ref to 0x40 and diode link thresh to 0x38. Saved run R45. Attachments 45-47
Waveforms look similar to original setting. High E spectra show no significant change.
Low E spectra have small peak near 32k and v. wide stretching to top of FSR.
1643: Changed nnaida11 preAmp ref to 0x60 and diode link thresh to 0x58. Saved run R46. Attachments 48-50.
Waveforms settled on ~7500 much more frequently, with most signals beginning and returning to ~7500.
High E spectra thresh at ~33500 as it was with 'standard' setting.
Low E spectra show vast reduction in high E rubbish, looking more like an exponential decay compared to previous wide 'mound'.
Big improvement over previous settings. Will try all n-side FEE with these settings later.
1700: Changed nnaida11 diode link thresh to 0x5a. Saved run R47 (~2hr run during tea break and other work).
0x60 HEC fast comparator threshold (all FEE64s except nnaida30) 0x02.
19.04 R47 ends Change BigRIPS setting from 110Zr to 88Ge
19.15 R48 Pulser walkthough BNC PB-4 amplitude 90,000-10,000 @ 10,000 step, freq 25Hz.
nnaida7 showed no SYNCS.
Used procedure described above (1202) - nnaida7 recovered OK
19.28 Started run R48 - pulser walkthrough.
R48 ends OK..
1944: Changed fast comparator threshold on LEC for...
- nnaida 1: 0xb -> 0x30
- nnaida2: 0x18 -> 0x30
- nnaida6: 0x10 -> 0x30
- nnaida10: 0x10 -> 0x30
- nnaida13: 0x12 -> 0x30
- nnaida14: 0x14 -> 0x30
Change, for all n-side FEE64s, preAmp reference from previous value to 0x60 and diode link thresh to 0x5a.
Saved settings to /MIDAS/DB/EXPERIMENTS/AIDA/2015Apr30-diode-mod3
(around) 20:30 pm: started data taking for 88Ge setting. First runs are with empty H target at MINOS/DALI for transmission measurement.
Degrader also changed during run R50. Initially: 0.6mm + 0.4mm + (0.3 mm?) + 1mm. The 1mm degrader was removed after ~ 1hr of run.
2300: NNAIDA#11: changed Fast Comparator of Low Energy channels to 0x40. It was set at 0xFF, and no discriminator data being produced. Rate of ~12 kHz for discriminator events in NNAIDA#11 for this setting (comparable to other FEE64s).
RUN: R51_* started after adjusting the NNAIDA11 setting |