We have just hosted the LUX Analysis Workshop here at Penn State University! The workshop was chaired by Dr. David Woodward, the LUX Analysis Coordinator and postdoc at Penn State, with help from Profs. Carmen Carmona and Luiz de Viveiros.
The LUX Dark Matter experiment has completed its science run and was disassembled in 2017, to make room for the next generation LUX-ZEPLIN (LZ) Dark Matter detector. Although its primary mission has been completed by setting world-leading constraints on Dark Matter cross-sections at the time, it has left a rich dataset that is still being actively mined for new physics, with Penn State leading the charge!
We got a brand new cleanroom in our lab in Davey 019, and we are getting it ready for use! With particle counts better than ISO5 and radon levels better than 0.2 pCi/L (7.4 Bq/m^3), it is ready for use for low background experiments!
Dr. David Woodward and Corey Herr are at SLAC, getting the LZ dark matter experiment ready to go! They were working on a test of the thermosyphon system that will be used to cool down the detector and liquify the xenon inside it.
(SLAC is the former “Stanford Linear Accelerator Center”, a national lab located in the bay area in California. It’s part of the LZ Collaboration, and it’s where a lot of the commissioning of the LZ detector is taking place prior to assembly underground in South Dakota!)
“Luiz de Viveiros, assistant professor of physics, has been selected by the U.S. Department of Energy’s (DOE) Office of Science to receive funding for his research as part of the DOE’s Early Career Research Program. The DOE program, in its ninth year, is designed to bolster the nation’s scientific workforce by providing support to exceptional researchers during the crucial early years of their careers, when many scientists do their most formative work. Awardees are chosen based on peer review by outside scientific experts and receive five years of research funding.”
Congratulations to Dr. David Woodward in being elected the new Analysis Coordinator for the LUX Dark Matter Experiment!
LUX has completed its science run and was disassembled in 2017. Although its primary mission has been completed (by setting world-leading constraints on Dark Matter cross-section at the time), it has left a rich dataset still being actively mined for new physics.
With the end of operations, the Analysis Coordinator is one of the most important roles in the experiment, as the experiment is now entirely focused on analysis. Starting on May 2018, he will responsible for leading all analysis efforts, including the organization of meetings, assignment and management of analysis tasks, hosting analysis workshops, reporting results to the collaboration, leading the writing and publication of papers, and ensuring the achievement of the collaboration’s scientific goals!
Drs. Tim Wendler and David Woodward from our group at Penn State went to the American Physical Society (APS) April Meeting in Columbus, Ohio, to talk about Project 8 and LUX/LZ!
Tim gave a concise introduction of the Project 8 Neutrino Mass Measurement Experiment, and an overview of the work he has been doing in developing the next phase of the experiment, in which we increase the detector size by orders of magnitude, in order to demonstrate that our experiment works in large scales and can achieve the necessary the stats to measure the neutrino mass. His work focus on the central question for determining the future of Project 8: can we detect the radiation emitted by a single electron in a large volume? He has been running simulations of the electron fields, antenna array designs and electronics to answer that!
David presented a talk in the APS mini-symposium on “Low Radioactivity Background Techniques in Underground Experiments”. He gave an overview of the external backgrounds found in the Davis Laboratory at SURF (Sanford Underground Research Facility), home of the LUX and LZ dark matter experiments. His talk focused on the muon-induced neutron backgrounds, which feature a model of the Earth surface above the underground lab (rather than a flat surface approximation), leading to unprecedented detailed simulations of the muon flux; and on gammas emitted by the surrounding cavern walls. For this latter one, the excellent shielding the detector has (a 300-tonnes water tank!) actually presents a problem in determining the expected background in the detector – we get too few interactions to actually build a model! To solve this, he created a new technique of calculating the flux in increasingly smaller concentric shells, then starting a new simulations with the flux at each of these shells, thus amplifying the number of particles reaching the detector, and thus obtaining a good model of the gamma background in the detector! His results show that these external background are sub-dominant by orders of magnitude and will not hinder the search for dark matter!
Penn State’s Dr. Tim Wendler is at the Pacific Northwest National Lab (PNNL) this week, attending the Collaboration Meeting of Project 8, a experiment that aims to measure the neutrino mass using novel cyclotron radiation detection techniques. He is working with our colleagues in Project 8 in understanding our detector and data, and planning the next stages of the experiment!
Our group has been assigned two labs at Penn State, and the second one is finally ready! Right across our first lab in Davey 012, the new lab in Davey 019 has a much larger footprint (>90 m²), and features a cleanroom (~15 m², with fume hood), 1-tonne crane, and a pit for deploying a cryostat cooled with a thermosyphon cryogenic system. The first lab will be dedicated to the development of electronics and the Project 8 neutrino mass experiment, while the second lab will be dedicated to cryogenics and other hardware for the LZ dark matter detection experiment.
Dr. David Woodward has joined the Dark Matter and Neutrino Mass group at Penn State on December 1st, 2017. David was already a member of the LUX/LZ collaboration, working on his Ph.D. at the University of Sheffield in the Vitaly Kudryavtsev group. He has been working mainly in backgrounds simulations and data analysis code development, and his Ph.D. thesis title is “Simulations of cosmic muons and background radiations for muon tomography and underground experiments”. David will continue working on the LUX and LZ dark matter experiments here at Penn State, and will lead the design, construction and operation of test systems for the commissioning of LZ. Welcome to Penn State, David!