29 research outputs found
Designing a Magnetic Measurement Data Acquisition and Control System with Reuse in Mind: A Rotating Coil System Example
Accelerator magnet test facilities frequently need to measure different
magnets on differently equipped test stands and with different instrumentation.
Designing a modular and highly reusable system that combines flexibility
built-in at the architectural level as well as on the component level addresses
this need. Specification of the backbone of the system, with the interfaces and
dataflow for software components and core hardware modules, serves as a basis
for building such a system. The design process and implementation of an
extensible magnetic measurement data acquisition and control system are
described, including techniques for maximizing the reuse of software. The
discussion is supported by showing the application of this methodology to
constructing two dissimilar systems for rotating coil measurements, both based
on the same architecture and sharing core hardware modules and many software
components. The first system is for production testing 10 m long
cryo-assemblies containing two MQXFA quadrupole magnets for the high-luminosity
upgrade of the Large Hadron Collider and the second for testing IQC
conventional quadrupole magnets in support of the accelerator system at
Fermilab
A Quench Detection and Monitoring System for Superconducting Magnets at Fermilab
A quench detection system was developed for protecting and monitoring the
superconducting solenoids for the Muon-to-Electron Conversion Experiment (Mu2e)
at Fermilab. The quench system was designed for a high level of dependability
and long-term continuous operation. It is based on three tiers: Tier-I,
FPGA-based Digital Quench Detection (DQD); Tier-II, Analog Quench Detection
(AQD); and Tier-3, the quench controls and data management system. The Tier-I
and Tier-II are completely independent and fully redundant systems. The Tier-3
system is based on National Instruments (NI) C-RIO and provides the user
interface for quench controls and data management. It is independent from Tiers
I & II. The DQD provides both quench detection and quench characterization
(monitoring) capability. Both DQD and AQD have built-in high voltage isolation
and user programmable gains and attenuations. The DQD and AQD also includes
user configured current dependent thresholding and validation times.
A 1st article of the three-tier system was fully implemented on the new
Fermilab magnet test stand for the HL-LHC Accelerator Up-grade Project (AUP).
It successfully provided quench protection and monitoring (QPM) for a cold
superconducting bus test in November 2020. The Mu2e quench detection design has
since been implemented for production testing of the AUP magnets. A detailed
description of the system along with results from the AUP superconducting bus
test will be presented
On the Application of Situational Crime Prevention Theory to the Practice of Comprehensive Administration of Social Security
社会治安综合治理经过十几年的发展已成为具有中国特色的犯罪治理模式。但在实践中要如何突破“口号味浓、操作性难”的被动局面,是社会治安综合治理工作的当务之急。情境预防是近年来世界范围内犯罪预防的主流理论之一,其在西方国家取得的显著成效,使之与社会预防、司法预防鼎足而立。社会治安综合治理从宏观的角度入手,将预防措施逐步演绎至微观局面、大局观强;情境预防犯罪理论从微观的预防实践入手,将预防措施归纳成指导性的宏观原则、操作性强。笔者认为,在我国社会治安综合治理过程中借鉴情境预防犯罪理论,具有其特别的应用价值和现实意义。本文从探求情境预防犯罪理论在我国社会治安综合治理过程中的实践应用入手,应用大量实证事例...After years of development, the comprehensive administration of social security has become a crime control model with Chinese characteristics. However, as it is packed with slogans and difficult to operate, it is a priority to break though that passive situation in practice. Situational crime prevention is one of the mainstream theories on crime prevention throughout the world in recent years. Wit...学位:法律硕士院系专业:法学院法律系_法律硕士(JM)学号:X200512018
Mu2e Technical Design Report
The Mu2e experiment at Fermilab will search for charged lepton flavor
violation via the coherent conversion process mu- N --> e- N with a sensitivity
approximately four orders of magnitude better than the current world's best
limits for this process. The experiment's sensitivity offers discovery
potential over a wide array of new physics models and probes mass scales well
beyond the reach of the LHC. We describe herein the preliminary design of the
proposed Mu2e experiment. This document was created in partial fulfillment of
the requirements necessary to obtain DOE CD-2 approval.Comment: compressed file, 888 pages, 621 figures, 126 tables; full resolution
available at http://mu2e.fnal.gov; corrected typo in background summary,
Table 3.
Modelling the molecular mechanisms of ageing
This document is the Accepted Manuscript version of a published work that appeared in final form in Bioscience reports. To access the final edited and published work see http://www.bioscirep.org/content/37/1/BSR20160177.The ageing process is driven at the cellular level by random molecular damage which slowly accumulates with age. Although cells possess mechanisms to repair or remove damage, they are not 100% efficient and their efficiency declines with age. There are many molecular mechanisms involved and exogenous factors such as stress also contribute to the ageing process. The complexity of the ageing process has stimulated the use of computational modelling in order to increase our understanding of the system, test hypotheses and make testable predictions. As many different mechanisms are involved, a wide range of models have been developed. This paper gives an overview of the types of models that have been developed, the range of tools used, modelling standards, and discusses many specific examples of models which have been grouped according to the main mechanisms that they address. We conclude by discussing the opportunities and challenges for future modelling in this field