Brian Chase
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View article: Characterizing the diet of Atlantic bluefin tuna Thunnus thynnus across its spatial range: a metadata analysis spanning over three decades
Characterizing the diet of Atlantic bluefin tuna Thunnus thynnus across its spatial range: a metadata analysis spanning over three decades Open
Atlantic bluefin tuna Thunnus thynnus (ABFT) are highly migratory predators that feed across diverse foraging habitats throughout their range. ABFT diet has been characterized regionally, but a broader analysis is needed to help inform eco…
View article: Eccentricity-driven glacial climate variability and its influence on speciation in the tropical Andes
Eccentricity-driven glacial climate variability and its influence on speciation in the tropical Andes Open
International audience
View article: Fire drives major Holocene vegetation shifts between subtropical and Mediterranean‐type ecosystems: a case study from a biodiversity hotspot in South Africa
Fire drives major Holocene vegetation shifts between subtropical and Mediterranean‐type ecosystems: a case study from a biodiversity hotspot in South Africa Open
Fire plays a pivotal role in driving ecological shifts between Mediterranean‐type vegetation and subtropical ecosystems in South Africa . This study investigates long‐term environmental dynamics and ecological regime changes at the Mediter…
View article: Palaeo-landscapes and hydrology in the South African interior: Implications for human history
Palaeo-landscapes and hydrology in the South African interior: Implications for human history Open
International audience
View article: Tropical forcing and ENSO dominate Holocene climates in South Africa's southern Cape
Tropical forcing and ENSO dominate Holocene climates in South Africa's southern Cape Open
This paper explores the Holocene climatic dynamics of South Africa's southern Cape, a region that supports a large proportion of the Greater Cape Floristic Region and contains an array of important archaeological sites. While South African…
View article: LLRF System for the Fermilab PIP-II Superconducting LINAC
LLRF System for the Fermilab PIP-II Superconducting LINAC Open
PIP-II is an 800 MEV superconducting linac that is in the initial acceleration chain for the Fermilab accelerator complex. The RF system consists of a warm front-end with an ion source, RFQ and buncher cavities along with 25 superconductin…
View article: Closed Loop Testing of Microphonics Algorithms Using a Cavity Emulator
Closed Loop Testing of Microphonics Algorithms Using a Cavity Emulator Open
An analog crystal filter based cavity emulator is modified with reverse biased varactor diodes to provide a tuning range of around 160 Hz. The piezo drive voltage of the resonance controller is used to detune the cavity through the bias vo…
View article: The RF Protection Interlock System Prototype Verification
The RF Protection Interlock System Prototype Verification Open
The Radio Frequency Protection Interlock system plays vital role in the LLRF related/dependent accelerator sections Protection. It’s main role is to collect information from number different sensors and indicators around nearest cavities a…
View article: Evaluation of the first version of the new RFPI system dedicated to PIP-II project accelerator
Evaluation of the first version of the new RFPI system dedicated to PIP-II project accelerator Open
The Low-Level Radio Frequency (LLRF) control system is one of the most critical superconducting linac infrastructures responsible for the parameters of the beam acceleration. The LLRF system mainly focuses on the electromagnetic field para…
View article: A ca. 39,000-year record of vegetation and climate change from the margin of the Namib Sand Sea
A ca. 39,000-year record of vegetation and climate change from the margin of the Namib Sand Sea Open
This paper presents the first continuous multi-proxy record of climate and vegetation change from the central Namib Desert extending over much of the last ca. 39,000 years. Derived from rock hyrax middens, evidence from stable carbon and n…
View article: Paleolakes and socioecological implications of last glacial “greening” of the South African interior
Paleolakes and socioecological implications of last glacial “greening” of the South African interior Open
Determining the timing and drivers of Pleistocene hydrological change in the interior of South Africa is critical for testing hypotheses regarding the presence, dynamics, and resilience of human populations. Combining geological data and p…
View article: High efficiency, low cost, RF sources for accelerators and colliders
High efficiency, low cost, RF sources for accelerators and colliders Open
Accelerators for High Energy Physics (HEP) are large users of energy, much of it in the form of radiofrequency (RF) power to accelerate particles to very high energies. Proposed HEP projects will require even larger amounts of RF energy. I…
View article: A Booster Replacement Linac for the Future of High Energy Physics at Fermilab
A Booster Replacement Linac for the Future of High Energy Physics at Fermilab Open
recent improvements in SRF technology. This Booster Replacement linac (BRL) will increase MI beam power to DUNE to more than 2.5 MW and enable next-generation intensity frontier experiments.
View article: crestr: An R package to perform probabilistic climate reconstructions from palaeoecological datasets
crestr: An R package to perform probabilistic climate reconstructions from palaeoecological datasets Open
Quantitative climate reconstructions are fundamental to better understanding past environmental changes and evaluating climate simulations. The proliferation of pollen-based reconstructions during the past decades has been instrumental in …
View article: Late-Holocene fynbos-forest dynamics in Orange Kloof, Table Mountain National Park, South Africa
Late-Holocene fynbos-forest dynamics in Orange Kloof, Table Mountain National Park, South Africa Open
Fynbos and afrotemperate forest exist as alternate stable states in the Cape Floristic Region of South Africa. In parts of Table Mountain National Park, afrotemperate forest has expanded in recent decades. The aim of this project was to ex…
View article: Novel Proposals for FAIR, Automated, Recommendable, and Robust Workflows
Novel Proposals for FAIR, Automated, Recommendable, and Robust Workflows Open
Funding: This work is partly funded by NSF award OAC-1839900. This material is based upon work supported by the U.S. Department of Energy, Office of Science, under contract number DE-AC02-06CH11357. libEnsemble was developed as part of the…
View article: SRF Cavity Emulator for PIP-II LLRF Lab and Field Testing
SRF Cavity Emulator for PIP-II LLRF Lab and Field Testing Open
There are many stages in the LLRF and RF system development process for any new accelerator that can take advantage of hardware emulation of the high-power RF system and RF cavities. LLRF development, bench testing, control system developm…
View article: High gradient performance and quench behavior of a verification cryomodule for a high energy continuous wave linear accelerator
High gradient performance and quench behavior of a verification cryomodule for a high energy continuous wave linear accelerator Open
An 8-cavity, 1.3 GHz, LCLS-II-HE cryomodule was assembled and tested at Fermilab to verify performance before the start of production. Its cavities were processed with a novel nitrogen doping treatment to improve gradient performance. The …
View article: The Need for Further Development of Magnetrons as RF Sources for HEP
The Need for Further Development of Magnetrons as RF Sources for HEP Open
Proposal to develop magnetrons as RF sources for HEP
View article: FERMILAB PIP-II BOOSTER LLRF UPGRADE
FERMILAB PIP-II BOOSTER LLRF UPGRADE Open
A proposed upgrade to the Fermilab Booster synchrotron is presented. A new LLRF system is required for interfac-ing to the PIP-II Linac that is currently under construction. The present feedback system has legacy analog hardware interleave…