Alpha Calibration Runs (need to check settings in logbook)

0-63: dE detector and 32-47 is n+n;  64-127 E detector and 96-111 is n+n; 128-191 HI detector

Run 13:  alpha source in fromt of dE detector (0-63). All detectors connected.

• 0-15 OK
• 16-31 OK
• 32-47 pulser appears at higher amplitude, alphas in a similar spot
• 48-63 OK
• 64-79 ch64 low gain but only for pulser (alphas look fine)
• 80-95 ch83 low gain, ch88 bad resolution. some strips show alphas
• 96-111 ch102 no alphas, ch103 low gain
• 112-127 pulser OK
• 128-191 (HI detector) looks ok
•  
•  

dE Layer is Removed

Run 15:  alpha source in front of E detector, no dE

• 0-15 OFF
• 16-31 OFF
• 32-47 OFF
• 48-63 OFF
• 64-79 ch64 low gain but only for pulser (alphas look fine)
• 80-95 ch83 low gain, ch88 bad resolution.
• 96-111 ch102 no alphas, ch103 low gain
• 112-127 OK

Run 16: alpha source in front of E detector, no dE

• 0-15 OFF
• 16-31 OFF
• 32-47 OFF
• 48-63 OFF
• 64-79 ch64 low resolution, low gain but only for pulser
• 80-95 ch83 low gain, ch88 bad resolution.
• 96-111 ch102 /ch103 problem
• 112-127 OK

Run 18 does not seem to be in Run book

Run 18: alpha source in front of E detector,

• 0-15 OFF
• 16-31 OFF
• 32-47 OFF
• 48-63 OFF
• 64-79 ch64 as Run 16
• 80-95 ch83 as Run 16
• 96-111 alphas there but there are two pulser peaks in all segments, and a lot of alpha peaks...
• 112-127 OK

Run 19: same settings as Run 16

• 0-15 OFF
• 16-31 OFF
• 32-47 OFF
• 48-63 OFF
• 64-79 ch64 as Run 16
• 80-95 ch83 as Run 16
• 96-111 102/103 empty/low gain
• 128-143 OK
• 144-159 152-154 low resolution
• 160-175 OK
• 176-191 OK

For later runs the information is taken from logbook as no runs have been saved:

Run 23: E detector switched to #2951-22

• 0-15 OFF
• 16-31 OFF
• 32-47 OFF
• 48-63 OFF
• 64-79 ch64 as Run16
• 80-95 ch83 as Run 16
• 96-111 102/103 empty/low gain
• 112-127 OK

Run 24 Cable for 1 mm E detector must be faulty; Check new cable

• 64-79 OK
• 80-95 ch 83 low gain
• 96-111 ch 101, ch 103 low gain 
• 112-127 OK

Run 1-10 Test

14 September 2017

Run 11 Start 18:16 (CERN time)

Faults:

adc#2 7,8 missing segments (n+n side dE)

adc#3 19 low gain (p+n E)

some strips have no noise but maybe that is OK.

Run 12 Start 11:50

Pulse switched on halfway through

Run 13 Start 12:08

Pulser on

ADC spectra:

#1 ch0 bad resolution (also pulser)

#2 ch7 ch8: no alphas, pulser there

#3 ch0 low gain, ch24 low resolution

#4 ch 7 low gain only for alphas (not pulser)

TDC missing: ch 32,80,120,123

Not understood yet: 1mm detector has peak at ~1.5 MeV @ adc#3 ch20-30 (with ALL alpha events when visible , 24 looks very distorted); not visible in ADC#4 (n+n) no alpha in ADC#6 although segment.

Discussion with ISOLDE staff -> things to sort out:

1) Removable Faraday Cup between Scattering Chamber and our Chamve