 Wed Nov 21 08:37:24 2018, Thomas Chillery, Marialuisa Aliotta, Raffaele Buompane, Upstream Collimator 
|
On 19/11/2018:
During the target ladder calibration (see elog entry #41) we also replaced the collimator (thickness ~24mm, diameter 3mm) located immediately
upstream from the target ladder - that is between the upstream and central sections of the chamber. We mounted an aluminium collimator (thickness ~1mm, |
|
Tue Apr 3 18:16:26 2018, Thomas Chillery, Lizeth Morales, Raffaele Buompane, Lucio Gialanella, Tests - Unpacking and Mounting Chamber Parts
|
This morning I unpacked the chamber parts.
I mounted the downstream and central lids with the iris arm hooks to double check we could still successfully mount them, see previous eLog entry
(#25) for photos from this procedure performed in Edinburgh. |
|
Fri Apr 6 11:39:10 2018, Thomas Chillery, Raffaele Buompane, David Rapagnani, Lucio Gialanella, Tests - Pumping down chamber and starting electronics tests
|
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 |
|
Wed Mar 7 16:56:52 2018, Thomas Chillery, Peter Black, Tests - Modifying Chamber Parts in Edinburgh
|
Today we began examining and modifying parts of the chamber shipped from CIRCE to Edinburgh.
The parts shipped were:
Chamber Collar
Central Lid
Downstream Lid
Two Metal Detector Masks
Two Iris Mounts
One |
|
Tue Mar 27 16:36:01 2018, Thomas Chillery, Peter Black, Tests - Modifying Chamber Parts in Edinburgh 11x
|
Between 7th to 21st March modifications were made to the top of the CIRCE target chamber.
These modifications address the three key issues highlighted during the February shifts
1. The central S2 detector did not fit, because its connector pins came into contact with the chamber lid |
|
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
|
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 |
|
Fri Apr 6 13:33:27 2018, Thomas Chillery, Raffaele Buomparte, David Rapagni, Jeremias Duartes, Tests - Attempting to solve noise issues
|
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 |
|
Fri Apr 6 14:54:12 2018, Thomas Chillery, Raffaele Buomparte, Tests - Attempting to solve noise issues
|
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 |
|
Wed Nov 21 08:53:06 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Lizeth Morales, Testing Electronic Chain - No Detectors
|
On 19/11/2018:
During the vacuum test - see eLog entry #43 we performed noise tests on the preamplifiers with no S2 detector connected
First we performed a "tabletop" test - the preamplifiers were not connected to the chamber. |
|
Wed Nov 21 08:45:03 2018, Thomas Chillery, Marialuisa Aliotta, Raffaele Buompane, Carlo Bruno, Testing Chamber Vacuum
|
On 19/11/2018:
We mounted the following in the chamber:
Iris frames - no S2 detectors or mylar
Si pin diode mount with 0.9um mylar - no diode
Target ladder with blank |
|
Sat Feb 17 13:00:51 2018, Thomas Chillery, Test - S2 Detector Bias
|
This morning whilst I was setting up the ribbon cabling (see eLog entry #8) I was considering collecting a voltage bias vs leakage current curve for
one/two of the S2 detectors, depending on time available.
This would involve using the central section of the chamber and the straight spacer box to mount the preamp on top of the lid. |
|
Tue Feb 18 14:39:26 2020, Thomas Chillery, Target Thicknesses
|
| Excel spreadsheet showing CH2 and natC target thicknesses attached |
|
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
|
(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 |
|
Fri Feb 16 18:28:42 2018, Thomas Chillery, David Rapagnani, Setup - Testing Chamber Vacuum
|
By 16:40 I mounted all three chamber lids.
The central chamber lid includes the diode detector mount, the iris, a vacuum feedthrough, and an actuator with no hook.
The downstream chamber lid includes a vacuum feedthrough and an actuator with no hook. |
|
Wed Feb 21 10:46:22 2018, Thomas Chillery, Tom Davinson, Raffaele Buompane, David Rapagnani, Setup - Pulser Settings and 20/02/2018 Pulser Walkthrough
|
The PB-5 Pulse Generator settings are as follows:
Fall Time = 100us
Rate = 2.00Hz |
|
Thu Feb 15 17:45:07 2018, Thomas Chillery, Raffaele Buompane, Setup - Problem: Connecting the actuator arm to the iris aperture arm
|
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 |
|
Thu Feb 15 17:34:28 2018, Thomas Chillery, Raffaele Buompane, Setup - Mounting Target Chamber Sections
|
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 |
|
Fri Feb 16 18:10:34 2018, Thomas Chillery, David Rapagnani, Setup - Electronics Rack and Aperture Iris
|
This morning we moved the electronics rack to within ~2.5m of the target chamber, leaving room for the ribbons cables of ~5m length which connect the
preamps to the amplifiers in the rack.
Then I continued in attempts to solve the iris arm problem, see eLog entry #3. |
|
Sat Feb 17 12:35:25 2018, Thomas Chillery, Setup - Electronic Cabling
|
Between 9:00 to 12:30 this morning Filipo was working on the weekend 14C measurements, allowing me to work in the lab during this period.
I unpacked four MALU 4532 Lecroy Logic Modules (sent to CIRCE two weeks ago). Three of these modules were installed into the 1434A CAMAC crate,
which already had one module installed from the July 2017 shift. One module remains out of the crate as a spare. |
|
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
|
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. |