A. S. Howard
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View article: Validation of the Linearity in Image Reconstruction Methods for Speckle Contrast Optical Tomography
Validation of the Linearity in Image Reconstruction Methods for Speckle Contrast Optical Tomography Open
Speckle contrast optical spectroscopy (SCOS) is an optical technique capable of measuring human cerebral blood flow and brain function non-invasively. Its tomographic extension, speckle contrast optical tomography (SCOT), can provide blood…
View article: Mapping human cerebral blood flow with high-density, multi-channel speckle contrast optical spectroscopy
Mapping human cerebral blood flow with high-density, multi-channel speckle contrast optical spectroscopy Open
Recently, speckle contrast optical spectroscopy (SCOS) enabled non-invasive, high signal-to-noise-ratio (SNR) human cerebral blood flow (CBF) measurements, relevant for both neuroscience and clinical monitoring of diseases with CBF dysregu…
View article: Lessons learned while developing the Serenity-S1 ATCA card
Lessons learned while developing the Serenity-S1 ATCA card Open
The Serenity-S1 is a production-optimised Advanced Telecommunications Computing Architecture (ATCA) processing blade based on the AMD Xilinx Virtex Ultrascale+ device. It incorporates many developments from the Serenity-A and Serenity-Z pr…
View article: Lessons learned while developing the Serenity-S1 ATCA card
Lessons learned while developing the Serenity-S1 ATCA card Open
The Serenity-S1 is a Xilinx Virtex Ultrascale+ based Advanced Telecommunications Computing Architecture (ATCA) processing blade that has been optimised for production. It incorporates many developments from the Serenity-A and Serenity-Z pr…
View article: Performance of a front-end prototype ASIC for the ATLAS High Granularity timing detector
Performance of a front-end prototype ASIC for the ATLAS High Granularity timing detector Open
This paper presents the design and characterisation of a front-end prototype ASIC for the ATLAS High Granularity Timing Detector, which is planned for the High-Luminosity phase of the LHC. This prototype, called ALTIROC1, consists of a 5 ×…
View article: Gain recovery in heavily Irradiated Low Gain Avalanche Detectors by high temperature annealing
Gain recovery in heavily Irradiated Low Gain Avalanche Detectors by high temperature annealing Open
Studies of annealing at temperatures up to 450$^\circ$C with LGADs irradiated with neutrons are described. It was found that the performance of LGADs irradiated with 1.5e15 n/cm$^2$ was already improved at 5 minutes of annealing at 250$^\c…
View article: Lessons learnt from the first vertical slice of the CMS Outer Tracker
Lessons learnt from the first vertical slice of the CMS Outer Tracker Open
A vertical slice of the CMS Outer Tracker has been tested at the tracker integration facility and at the M2 muon beam facility at CERN. It includes the final prototype of the 2S module with an optical link to the back-end ATCA system. The …
View article: Gain dependence on free carrier concentration in LGADs
Gain dependence on free carrier concentration in LGADs Open
Low gain avalanche detectors (LGADs) were investigated with transient current technique utilizing 1064 nm light to determine the effect of ionization density on the measured gain. The ionization density was varied with laser intensity and …
View article: Performance in beam tests of irradiated Low Gain Avalanche Detectors for the ATLAS High Granularity Timing Detector
Performance in beam tests of irradiated Low Gain Avalanche Detectors for the ATLAS High Granularity Timing Detector Open
The High Granularity Timing Detector (HGTD) will be installed in the ATLAS detector to mitigate pile-up effects during the High Luminosity (HL) upgrade of the Large Hadron Collider (LHC) at CERN. The design of the HGTD is based on the use …
View article: Design and testing of LGAD sensor with shallow carbon implantation
Design and testing of LGAD sensor with shallow carbon implantation Open
The low gain avalanche detectors (LGADs) are thin sensors with fast charge collection which in combination with internal gain deliver an outstanding time resolution of about 30 ps. High collision rates and consequent large particle rates c…
View article: Characterization of Low Gain Avalanche Detector Prototypes’ Response to Gamma Radiation
Characterization of Low Gain Avalanche Detector Prototypes’ Response to Gamma Radiation Open
Motivated by the need for fast timing detectors to withstand up to 2 MGy of ionizing dose at the High Luminosity Large Hadron Collider, prototype low gain avalanche detectors (LGADs) have been fabricated in a single pad configuration, 2 × …
View article: Response of Low Gain Avalanche Detector Prototypes to Gamma Radiation
Response of Low Gain Avalanche Detector Prototypes to Gamma Radiation Open
Motivated by the need for fast timing detectors to withstand up to 2 MGy of ionizing dose at the High Luminosity Large Hadron Collider, prototype low gain avalanche detectors (LGADs) have been fabricated in single pad configuration, 2x2 ar…
View article: Effects of shallow carbon and deep N++ layer on the radiation hardness of IHEP-IME LGAD sensors
Effects of shallow carbon and deep N++ layer on the radiation hardness of IHEP-IME LGAD sensors Open
Low Gain Avalanche Diode (LGAD) is applied for the High-Granularity Timing Detector (HGTD), and it will be used to upgrade the ATLAS experiment. The first batch IHEP-IME LGAD sensors were designed by the Institute of High Energy Physics (I…
View article: Annealing effects on operation of thin Low Gain Avalanche Detectors
Annealing effects on operation of thin Low Gain Avalanche Detectors Open
Several thin Low Gain Avalanche Detectors from Hamamatsu Photonics were irradiated with neutrons to different equivalent fluences up to $Φ_{eq}=3\cdot10^{15}$ cm$^{-2}$. After the irradiation they were annealed at 60$^\circ$C in steps to t…