28 research outputs found
Characterisation of strip silicon detectors for the ATLAS Phase-II Upgrade with a micro-focused X-ray beam
The planned HL-LHC (High Luminosity LHC) in 2025 is being designed to maximise
the physics potential through a sizable increase in the luminosity up to 6 · 1034 cm−2
s
−1
. A
consequence of this increased luminosity is the expected radiation damage at 3000 fb−1
after ten
years of operation, requiring the tracking detectors to withstand fluences to over 1 · 1016 1 MeV
neq/cm2
. In order to cope with the consequent increased readout rates, a complete re-design of the
current ATLAS Inner Detector (ID) is being developed as the Inner Tracker (ITk). Two proposed detectors for the ATLAS strip tracker region of the ITk were characterized at
the Diamond Light Source with a 3 µm FWHM 15 keV micro focused X-ray beam. The devices
under test were a 320 µm thick silicon stereo (Barrel) ATLAS12 strip mini sensor wire bonded
to a 130 nm CMOS binary readout chip (ABC130) and a 320 µm thick full size radial (end-cap)
strip sensor - utilizing bi-metal readout layers - wire bonded to 250 nm CMOS binary readout chips
(ABCN-25).
A resolution better than the inter strip pitch of the 74.5 µm strips was achieved for both detectors.
The effect of the p-stop diffusion layers between strips was investigated in detail for the wire bond
pad regions.
Inter strip charge collection measurements indicate that the effective width of the strip on the
silicon sensors is determined by p-stop regions between the strips rather than the strip pitch
Ultraviolet photodissociation of gas-phase transition metal complexes: dicarbonylcyclopentadienyliodoiron(II)
Coupled-cluster reference values for the GW27 and GW100 test sets for the assessment of GW methods
Characterization of volatiles from Moroccan propolis samples
The volatiles from 24 propolis samples collected from different geographical locations in Morocco
were evaluated. Propolis volatiles isolated by hydrodistillation and analyzed by gas chromatography (GC) and gas chromatography–mass spectrometry (GC-MS). Cluster analysis based on
propolis samples’ volatile chemical composition defined two main uncorrelated clusters. Cluster I,
with 23 of the 24 samples analyzed, included three subgroups, Ia, Ib1 and Ib2, dominated by βeudesmol (11–30%), cedrol (7–40%) and n-tricosane (6–34%), respectively. Cluster II included just
one sample, with ar-curcumene (32%) as the main component. The results obtained contributed
to increase the knowledge on the chemical composition and variability of Moroccan propolis
samples. The volatile profile of these samples was distinct from those of Algeria, Canary Islands
and Ethiopia, the sole African propolis volatiles studied so far.POCI-01-0145-FEDER-007638; Fundação para a Ciência e a
Tecnologia (FCT) /MCTES through national funds (PIDDAC),
the co-funding by the FEDER, within the PT2020 Partnership
Agreement and Compete 2020info:eu-repo/semantics/publishedVersio