 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 09:19:19 2018, Thomas Chillery, Tom Davinson, Raffaele Buompane, David Rapagnani, Setup - Testing Chamber Vacuum and Mounting Detectors and Alpha Source
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(Note: Tom Davinson is now in CIRCE until the 21st)
On 19/02/2018 we performed the following:
This morning we gave CIRCE technician Antonio slanted spacer boxes (for mounting preamps) and also the Al box (used for target ladder) for minor |
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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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Wed Feb 21 10:46:22 2018, Thomas Chillery, Tom Davinson, Raffaele Buompane, David Rapagnani, Setup - Pulser Settings and 20/02/2018 Pulser Walkthrough
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The PB-5 Pulse Generator settings are as follows:
Fall Time = 100us
Rate = 2.00Hz |
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Fri Apr 6 12:07:52 2018, Thomas Chillery, Raffaele Buomparte, David Rapagni, Jeremias Duartes, Tests - Attempting to solve noise issues, 15 min alpha calibration
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On 05/04/18:
At 9:00 the pressures read ~10mBar inside the chamber (static vacuum). We began venting the chamber.
During venting the cable daisy chain on top of the preamp boxes was removed, the downstream preamp box was removed. It was decided to also removed |
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Fri Apr 6 13:33:27 2018, Thomas Chillery, Raffaele Buomparte, David Rapagni, Jeremias Duartes, Tests - Attempting to solve noise issues
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On 05/04/18, after eLog #28
After the alpha calibrationrun Raffaele arrived and started beam tuning for 7Li 2+ at 5.0MeV using a LiO molecular source
We set the target ladder to position II (80.024 mm) - no target frame or target |
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Fri Apr 6 14:54:12 2018, Thomas Chillery, Raffaele Buomparte, Tests - Attempting to solve noise issues
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Today we started by mounting the central and downstream preamp box lids.
The pumps were left running overnight, at 9:06 CHUP = 2.1e-5mBar and CHDW = 5.8e-5mBar.
We biased the detectors |
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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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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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Fri Apr 6 11:39:10 2018, Thomas Chillery, Raffaele Buompane, David Rapagnani, Lucio Gialanella, Tests - Pumping down chamber and starting electronics tests
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On 04/04/18:
We mounted S2 2323-18 (496um) in the downstream position with 12um mylar
We mount the central and downstream iris arms, we set the central arm position to 14.0mm and the downstream arm position toe 1.5mm - opening |
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Fri Feb 23 13:15:05 2018, Thomas Chillery, Raffaele Buompane, David Rapagnani, Setup - Beam Tuning and Prepare Chamber for Measurement at 3.45MeV 7Li - Night of 22nd
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Checking SRIM 3.5 MeV 7Li is stopped in 9.06um mylar or 10.09 um CH2.
After the long run at 3.0MeV on 22/02/2018 we decided to put the 12um mylar back in front of the S2 and start tuning the beam for 3.45MeV 7Li.
We also decided to tune the beam to a higher current of ~ 100pA to try and improve the detection rates. |
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Thu Feb 15 17:34:28 2018, Thomas Chillery, Raffaele Buompane, Setup - Mounting Target Chamber Sections
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This morning both myself and Raffaele mounted the beamline section of the target chamber.
We also mounted the turbo located immediately downstream from the target chamber, see attached IMG_2621.jpg image - the beam will enter from
the right of the image |
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Thu Feb 15 17:45:07 2018, Thomas Chillery, Raffaele Buompane, Setup - Problem: Connecting the actuator arm to the iris aperture arm
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After lunch we attempted to connect the actuator arms to the iris arm used to change the iris diameter. We need two iris diameters: fully open for experiment
measurements and a 5mm diameter for beam focusing
To do this the original design uses a cuboid with two rods, one rod is connected to the actuator arm, and the other rod is connected to the iris |
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Tue Mar 6 15:29:55 2018, Thomas Chillery, Raffaele Buompane, Collecting S2 Alpha Calibration Spectra at End of February Test Shifts
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On 23/02/2018:
We moved the target ladder to position 7, 5.019mm, with the alpha source facing downsteam.
At 17:17 we started the DAQ for a 15 minute alpha spectrum on the downstream S2. Save name: /Remote_Objs/RData_1/180223172135 |
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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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Tue Mar 6 15:55:04 2018, Thomas Chillery, Raffaele Buompane, End of February 2018 Shifts
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On 23/02/2018:
At the end of the February 2018 shifts the detectors bias settings were:
S2 bias = -130.3V, leak I = 2.42uA |
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Thu Apr 12 12:47:04 2018, Thomas Chillery, Raffaele Buompane, Central S2 Alpha Calibration
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Date: 06/04/2018
We connected the analogue signals of RAL X, XII, XIII, and "R" to the 3rd ADC (Module 4)
We connected the analogue signals of RAL "S", "Q", "u", and "w" to the 4th ADC (Module 5) |
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Thu Apr 12 13:12:00 2018, Thomas Chillery, Raffaele Buompane, 7Li 5.0MeV Beam tests with Central S2
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Date: 06/04/2018 (after 16:40)
We powered the preamps for the two S2 detectors and the diode.
We biased the detectors: |
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Thu Apr 12 14:14:09 2018, Thomas Chillery, Raffaele Buompane, 7Be 5.0MeV Beam test with central S2
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Date: 06/04/2018
Before starting this beam test we lowered the channel thresholds on ADC 3 and 4 (modules 4 and 5) from 40 to 8
The diode Ortec 571 settings are: |
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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 |