Precision Muon Tracking Detectors for High-Energy Hadron Colliders

Small-diameter muon drift tube (sMDT) chambers with 15 mm tube diameter are a cost-effective technology for high-precision muon tracking over large areas at high background rates as expected at future high-energy hadron colliders including HL-LHC. The chamber design and construction procedures have been optimized for mass production and provide sense wire positioning accuracy of better than 10 ?m. The rate capability of the sMDT chambers has been extensively tested at the CERN Gamma Irradiation Facility. It exceeds the one of the ATLAS muon drift tube (MDT) chambers, which are operated at unprecedentedly high background rates of neutrons and gamma-rays, by an order of magnitude, which is sufficient for almost the whole muon detector acceptance at FCC-hh at maximum luminosity. sMDT operational and construction experience exists from ATLAS muon spectrometer upgrades which are in progress or under preparation for LHC Phase 1 and 2

Precision Muon Tracking at Future Hadron Colliders with sMDT Chambers

Small-diameter muon drift tube (sMDT) chambers are a cost-effective technology for high-precision muon tracking. The rate capability of the sMDT chambers has been extensively tested at the Gamma Irradiation Facility at CERN in view of expected rates at future high-energy hadron colliders. Results show that it fulfills the requirements over most of the acceptance of muon detectors. The optimization of the read-out electronics to further increase the rate capability of the detectors is discussed. Chambers of this type are under construction for upgrades of the muon spectrometer of the ATLAS detector at high LHC luminosities. Design and construction procedures have been optimized for mass production while providing a precision of better than 10 micrometers in the sense wire positions and the mechanical stability required to cover large areas.Comment: 5 pages, 12 figures; conference proceedings for IEEE NSS & MIC conference, San Diego, 201

Resonant and antiresonant bouncing droplets

When placed onto a vibrating liquid bath, a droplet may adopt a permanent bouncing behavior, depending on both the forcing frequency and the forcing amplitude. The relationship between the droplet deformations and the bouncing mechanism is studied experimentally and theoretically through an asymmetric and dissipative bouncing spring model. Antiresonance effects are evidenced. Experiments and theoretical predictions show that both resonance at specific frequencies and antiresonance at Rayleigh frequencies play crucial roles in the bouncing mechanism. In particular, we show that they can be exploited for droplet size selection.Comment: 4 pages, 4 figures and 1 vide

Hydraulic structures: Useful water harvesting systems or relics?

Throughout the ages, the construction of hydraulic structures has supported the development of human civilisation. Around 3000 BC, masonry dams on the Nile provided irrigation water in Egypt, while in Mesopotamia canals were built for irrigation, draining swamps and transportation [2, 3, 5]. The 18th and 19th centuries saw the rapid development of water supply systems in response to the industrial development and the needs for reliable water supply [4, 7, 8] (Fig. 1 & 2). More recently, the 1940s to 1970s saw a worldwide boom in large water projects, mainly for consumption, irrigation, transport, hydropower and flood protection [3]. For example, the California Central Valley Project, built between 1933 and 1970, provides irrigation water to over 1.2 million hectares and generates over 1 million kW of power [3]. The rate of construction of new water projects in Europe and North America has dropped during the last few decades, and many of the original water harvesting system mega projects are now near, or even past, their original intended design lives. The question therefore arises whether the existing systems are redundant relics from the past that have reached their sell-by date, or do they still have an important role to play in modern society

Letter from [Robert] Evett to Hubert Creekmore (16 September 1954)

Evett writes from Washington, D.C. on New Republic letterhead to Creekmore in Jackson, Mississippi. Evett asks Creekmore to write an article on the Citizen\u27s Councils, and he states that his only understanding of them comes from a Jackson Clarion-Ledger article. Includes envelope.https://egrove.olemiss.edu/creekmore/1223/thumbnail.jp

Letter from Levi Robert Lind to Hubert Creekmore

Lind is a professor in the Department of Latin and Greek at the University of Kansas in Lawrence, Kansas. He writes on department letterhead from Rome, Italy, to Creekmore in Jackson, Mississippi. He asks if Creekmore has received the translations of Ezra Pound\u27s poetry. Includes envelope.https://egrove.olemiss.edu/creekmore/1246/thumbnail.jp

Letter from Robert M. MacGregor to Hubert Creekmore

MacGregor writes from New York City on New Directions Publishing Corporation letterhead to Creekmore in Jackson, Mississippi, regarding warehouse storage for The Long Reprieve. Includes envelope.https://egrove.olemiss.edu/creekmore/1231/thumbnail.jp

Letter from Robert K. Haas to Hubert Creekmore

Haas is vice president of Random House, Inc. and writes on company letterhead from New York City to Creekmore in Jackson, Mississippi, to praise Creekmore\u27s A Little Treasury of World Poetry.https://egrove.olemiss.edu/creekmore/1125/thumbnail.jp