AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
BRIKEN
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Mon Mar 31 13:08:02 2025
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> Preamplifier and signal cable testing > > We check all signal cables,the flat cable connector to BNC > from ORNL/UTK and they are OK. > > While checking the preamplifiers (PA) we realized that on the oscilloscope > some of the channels shown pulses without a load when HV is on. > After some checks, we come to the conclusion that is a kind of discharge > on the HV part of the preamp (which appears as positive pulse or negative pulses) > and induce pulses of opposite sign in one or mos neighbouring channels. > After systematically investigating them in the scope, we plug them in the DACQ > to record the spectra. For this we include an additional digitizer SIS3316 > to connect al1 channel preamps > PA1(D):UPC:SN-0808223 -> V1A1 > PA2(D):GSI:SN-1112572 -> V1A2 > PA3(D):UPC:SN-0310315 -> V1A3 > PA4(D):UPC:SN-0808220 -> V1A4 > PA5(U):UTK: ? -> V1A5 > PA6(U):UTK:SN-0808218 -> V1A6 > PA7(U):UTK:SN-0713586 -> V1A7 > PA8(U):UTK:SN-0808221 -> V2A1, V2A2 > PA9(U):UTK:SN-0808215 -> V2A3, V2A4 > PA10(U):UTK:SN-0808217 -> V2A5, V2A6 > > We measure first with a tube of each type connected to Ch#1 of each PA > to adjust parameters of digitizers and range > List-mode: 160717_preampCheck_000.dlt > On-line: 160717_preampCheck.root > > Then we remove the tube from Ch#1 to see the effect in this channel: > List-mode: 160717_preampCheck_noTubes_001.dlt > On-line: 160717_preampCheck_noTubes.root > > We attach screenshots for both as compressed files (.zip) > and the root files
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