AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
nToF
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Sat May 18 09:08:41 2024
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> > This morning 2x RAL108 +/-15V PSUs were borrowed from the Edinburgh equipment in the ISOLDE hall to check whether the same transient noise is observed at the +/-15V PSU > outputs - this was confirmed. See https://elog.ph.ed.ac.uk/nToF/63 > > Following this test the same 2x RAL108 +/-15V PSUs were tested in the ISOLDE hall ( 19" rack adjacent to the HIE-ISOLDE GP scattering chamber ). > > > PSU #1 Coutant HSC15-3.0 > > Setup and PSU details - attachments 1-4 > > DSO ch#1 +15V AC/1M, ch#2 -15V AC/1M - y: 5mV/div x: 400ns, 4us & 40us/div - attachments 5-7 > > > PSU #2 Farnell MX2 > > Setup and PSU details - attachments 8-10 > > DSO ch#1 +15V AC/1M, ch#2 -15V AC/1M - y: 5mV/div x: 400ns, 4us & 40us/div - attachments 11-13 > > > Conclusion > > The noise of the 2x RAL108 +/-15V PSUs differed somewhat ( frequency and structure of HF transients ) from each other in the ISOLDE test. > > Compared to the EAR2, n_TOF test the amplitudes were c. 10x smaller and the HF transient frequency and structure differed. > > This appears to confirm that the primary problem is the ac mains power in EAR2, n_TOF - input and/or output filtering is required.
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