 Mon Dec 3 17:59:48 2018, Thomas Chillery, Raffaele Buompane, Calibration with alpha source - 0.9um mylar on Far S2 
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On 28/11/2018:
After pulser walkthrough (see eLog entry #67)
Dismounted targets from ladder - see picture 1 and 2 for upstream and downstream sides respectively |
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Mon Dec 3 18:15:42 2018, Thomas Chillery, Raffaele Buompane, Calibration with alpha source - no mylar on Far S2
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On 28/11/2018:
At 13:35: Far S2 bias = -130.0V, leak I = 1.55uA. Diode bias = -70.1V, leak I = 0.00uA.
Pressures (mBar): |
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Mon Dec 3 18:30:53 2018, Thomas Chillery, Raffaele Buompane, Calibration with alpha source - 12um mylar on Far S2
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On 28/11/2018:
Mounted 12um mylar in front of far S2 - see attached pictures 1 and 2
In air: Far S2 biased to -130.0V, leak I = 1.61uA. Diode biased to -70.1V, leak I = 0.01uA -> 0.00uA. Rate meter ~ 4500Hz. |
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Mon Dec 3 18:45:17 2018, Thomas Chillery, Raffaele Buompane, End of beamtime - Module settings
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Diode Ortec 571 Amplifier Settings:
Fine gain: 10 (0.5 ->1.5)
Course gain: 50
Shaping time: 0.5us
BLR AUTO: ON
NEG: ON (Instead
of POS)
OUT: ON (Instead of Delay)
Internal fine gain: 1X
Diode quad TFA settings: |
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Mon Dec 3 18:55:31 2018, Thomas Chillery, Raffaele Buompane, End of beamtime - Cleanup 8x
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On 29/11/2018:
Dismounted S2 2323-18 (496um), 12um mylar, diode, and diodes 0.9um mylar.
Performed general cleanup of lab. Boxed away cables and other parts. See attached pictures 1, 2, 3, and 4. |
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Mon Dec 3 19:04:20 2018, Thomas Chillery, Raffaele Buompane, End of beamtime - Items to be shipped back to Edinburgh
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To be shipped back to Edinburgh for repair:
Item
Quantity
ECL - NIM Convertor
2
Quad HV Supply
1
Quad |
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Wed Mar 7 16:56:52 2018, Thomas Chillery, Peter Black, Tests - Modifying Chamber Parts in Edinburgh
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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 |
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Tue Mar 27 16:36:01 2018, Thomas Chillery, Peter Black, Tests - Modifying Chamber Parts in Edinburgh 11x
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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 |
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Wed Nov 21 08:45:03 2018, Thomas Chillery, Marialuisa Aliotta, Raffaele Buompane, Carlo Bruno, Testing Chamber Vacuum
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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 |
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Wed Nov 21 08:37:24 2018, Thomas Chillery, Marialuisa Aliotta, Raffaele Buompane, Upstream Collimator
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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, |
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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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Sat Nov 24 16:39:22 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Tom Davinson, Raffaele Buompane, 7Li 4.0 MeV beam on CH2 target 15
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On 23/11/2018:
Tuned beam for 4.0 MeV 7Li, charge state 2+
Measured transmission of beam through FCC using 3 mm and 10 mm size collimators: 66 pA with 10 mm -> 60 pA with 3 mm -> 91% transmission |
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Mon Nov 26 17:10:13 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Tom Davinson, Raffaele Buompane, 7Li 4.0 MeV beam on natC target 3
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On 23/11/2018:
After the runs with 7Li on CH2 15, we moved the target ladder to position 5: carbon foil #3 (~590 ug/cm^2)
Run # 181123214406 |
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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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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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Wed Nov 21 08:53:06 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Lizeth Morales, Testing Electronic Chain - No Detectors
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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. |
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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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Thu Nov 22 11:34:07 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Lizeth Morales, Continuing Electronic Chain Tests
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This morning at 8:35am the pressures read (in mBar):
TPU1 = 2.0e-6
TPU2 = 4.5e-7
TPD1 = 8.1e-7
TPD2 = 7.9e-7
CHUP = 4.7e-7
CHDW = 1.1e-5
The
detectors were biased. Far S2 leak I = 1.54uA, near S2 leak I = 12.53uA. |
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Thu Nov 22 11:53:08 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Lizeth Morales, DAQ tests with alpha source
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The target ladder is set for position 7 - the double alpha source.
Looking at the FAIR DAQ, for the Far S2 the first RAL amplifier (XV) shows:
Alphas at channel 700
Pulser centroid at channel ~2640, with 9 channel FWHM -> corresponds to 44 keV FWHM at 4.91 keV/channel
The |
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Sat Nov 24 15:05:40 2018, Thomas Chillery, Marialuisa Aliotta, Carlo Bruno, Lizeth Morales, FAIR DAQ
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The FAIR DAQ IP address: 192.168.1.90
The data is saved in /Local_Parts/Part0DE/
After each run we should copy the data to the 7Be shift folder: /home/circe/7Be_pp/181122/ |