 Sun Feb 25 15:14:54 2018, Thomas Chillery, Lizeth Morales, David Rapagnani, Setup - Beam Tuning and Prepare Chamber for Measurement at 3.45MeV 7Li - Morning of 23rd
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On the morning of 23/02/18 we aimed to complete beam tuning of 7Li at 3.45MeV.
At 8:43 CHUP = 7.2e-6mBar, CHDW = 1.9e-5mBar.
The S2 bias was ramped to -130.3V, leak I = 1.67uA. The diode bias was ramped to -70.1V, leak I = 0.01uA. The preamp power was also switched |
Thu Feb 22 07:58:48 2018, Thomas Chillery, Tom Davinson, Raffaele Buompane, David Rapagnani, Lucio Gialanella, Setup - Beam Tuning and Prepare Chamber for Measurement at 3.0MeV 7Li 
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On 21/02/2018 we reattempted the beam tuning. We expected this to be easier now the rogue mylar is removed from the beamline.
At 8:30 we started the roughing pumps. At 8:37 the turbos were switched on. By 8:55 the preassures read: Up = 1.6e-5, and Down = 4.3e-5
mBar. |
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Tue Feb 20 17:03:08 2018, Thomas Chillery, Tom Davinson, Raffaele Buompane, David Rapagnani, Setup - Beam Tuning
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The pumps were left on overnight, in the morning at 8:25 the pressure reads:
Up = 1.5e-5 mBar and Down = 4.0e-5 mBar.
We made a first attempt at collecting an alpha spectrum for the far S2 detector using ADC 2 and ADC 3. However ADC 3 appeared to be acting as |
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Fri Apr 13 14:31:59 2018, Thomas Chillery, Lucio Gialanella, Setting up for 7Be 5.0MeV beam
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Date: 07/04/2018
We changed to cathod 23 - 7Be
For beam tuning we: |
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Wed Nov 21 09:34:26 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Setting up chamber both for tests under vacuum and physics measurement
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Today we mounted the far aperture used to control the far iris. No problems were encountered with this.
We mounted the target ladder with the following configuration, see also pictures 1 and 2:
Target #
Target
I
Blank |
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Sat Nov 24 15:07:00 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Lizeth Morales, Tom Davinson, Searching for causes of noise
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On 22/11/2018 in the afternoon:
We increased the ADC thresholds to 40 (previously 8).
For an alpha source with pulser connected, the event multiplicity dropped from ~63 to ~10. Dead time ~ 7% |
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Tue Feb 20 16:57:49 2018, Thomas Chillery, Screenshots - ADC 2 and ADC 4 settings, and example pulser walkthrough 11x
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Mon Dec 3 17:51:46 2018, Thomas Chillery, Raffaele Buompane, Pulser Walkthrough
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On 28/11/2018:
Performed pulser walkthrough, Run # 181128090835
Run time: 1986s
Pulser ON, amplitude changed
Target: None
Beam: None
DT ~ 11%
See |
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Wed Nov 21 09:28:06 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Lizeth Morales, Problem encountered with near iris arm
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On 20/11/2018:
After the electronics tests in air (see eLog entry #44) we started to setup the chamber for vacuum tests with an alpha source.
We started mounting the aperture used for controlling the near iris arm, however we encountered a problem. The iris arm got stuck and could not |
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Sat Nov 24 16:29:10 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Tom Davinson, Raffaele Buompane, Preparing setup for 7Li beam
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On 23/11/2018:
10:15 started pumping down chamber with Ecodry 2
RAL thresholds: |
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Mon Nov 26 17:13:45 2018, Thomas Chillery, Carlo Bruno, Tom Davinson, Lucio Gialanella, Preparing chamber for 4MeV 7Be 2+ beam
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On 24/11/2018:
At 8:35 the chamber pressures read (mBar):
TPU1 = 2.2
TPU2 = 2.2
TPD1 = 2.2
TPD2 = 2.0
CHUP = Sensor Off
CHDW = No Sensor
The |
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Tue Dec 4 09:40:31 2018, Thomas Chillery, Preliminary measurements of target activation using geiger counter
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On 29/11/2018 at 17:40 a rough measurement of the irradiated target activity was performed using a geiger counter.
The geiger counter was a calibrated Berthold LB124, which was placed a fixed 15mm distance from each target.
The calibration was such that 1cps = 37kBq. |
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Thu Feb 15 20:45:27 2018, Thomas Chillery, Planning - Target Chamber CAD diagram
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| Find attached the latest CAD diagram of the Target Chamber, drawn by Peter Black |
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Tue Mar 6 15:41:53 2018, Thomas Chillery, Raffaele Buompane, Pin Diode Pulser Walkthrough at End of February Shifts
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On 23/02/2018:
After the alpha source calibration of the S2 (See eLog entry #21) we decided to perform a pulser walkthrough for the pin diode on ADC 6 CH 31.
The pulser was only connected to the pin diode preamp to ensure it wasnt being split. |
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Wed Nov 21 09:09:41 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Lizeth Morales, David Rapagni, Mounting Detectors / Continuing Electronic Chain Tests
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On 20/11/2018:
At 9:00 we walked into the lab, David R reported he found all the pumps OFF. A thunderstorm occurred overnight causing a power outage.
Last night we had switched off the electronics (Preamp power, RAL amp rack, and NIM bin). |
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Thu Feb 22 10:40:49 2018, Thomas Chillery, Raffaele Buompane, David Rapagnani, Lucio Gialanella, Measurement / Test - 3.0MeV 7Li on CH2 Target VII
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On 21/02/2018 after beam tuning and pumping down at 18:07 the pressures read Up = 1.2e-5mBar, Down = 3.2e-5mBar. We were happy to power the detectors
and try to observe spectra from beam in both the S2 and pin diode.
Whilst waiting for the turbos to spin up the Pin diode was daisy chained with the +ve pulser, +15V, and -15V preamp power cables used with EDI |
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Sun Feb 25 15:59:38 2018, Thomas Chillery, Lizeth Morales, Raffaele Buompane, David Rapagnani, Lucio Gialanella, Measurement - 3.45MeV 7Li on CH2 Target III
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On 23/02/2018 at 13:49 we started the DAQ in list mode.
After starting the DAQ we sent the 3.45MeV 7Li beam onto the CH2 930ug/cm2 target III.
The trigger rate ~ 2kHz, event multiplicity = 6.1, dead time ~ 9%. |
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Thu Feb 22 18:04:12 2018, Thomas Chillery, Raffaele Buompane, David Rapagnani, Lucio Gialanella, Measurement - 3.0MeV 7Li on CH2 Target VII
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Yesterday (21st) night we saw this low channel, high rate (1500Hz) noise on the diode spectrum - see eLog entry #15.
This morning the S2 bias was ramped to -130.3V, leak I = 1.43uA. Diode bias ramped to -70.0V, leak I = 0.01uA.
Starting the DAQ with no beam, the trigger rate is ~250 Hz, with most triggers coming from the diode. Inspecting with the oscilloscope we find |
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Wed Sep 18 14:01:13 2019, Thomas Chillery, Logbook Spreadsheet
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| See attached for the logbook |
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Mon Dec 3 17:40:51 2018, Thomas Chillery, Carlo Bruno, Raffaele Buompane, Lab background
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On 27/11/2018:
Run # 181127200709
Run time: 46329s
Pulser ON, as before
No target
No beam
Lab background
DT ~ 12%
See |