The second generation of optimized beam orbit measurement (BOM) system of LEP: hardware and performance description

The BOM System with its 504 Beam Position Monitors and 40 Processing Electronics Stations, distributed along the 27 km of the LEP tunnel, has been optimized for all beam conditions and modes of operation. The description of the Beam Position Monitors (or PU) behavior in the tunnel is given. The guiding approaches for obtaining both main aspects of the critical BOM performances were: a) high reliability, since most of the electronics is not accessible during operation, and b) resolution, precision and stability of the signal processing equipment for the management of the LEP optics, polarization and energy calibration. The finalized analog signal processing chains, both Wide-Band and Narrow-Band, are described. Since local memories allow for the recording of data at each bunch passage during more than 1000 revolutions, it can be followed by a powerful digital signal processing allowing for many modes of beam observation. Examples are presented of beam and machine behavior studies. The BOM System has been a key instrument for the success of LEP operation

Control Modules for Scintillation Counters in the SPS Experimental Areas

The hardware used in the SPS Experimental Areas to control the beam instrumentation electronics and mechanics of the particle detectors is based on CAMAC and NIM modules. The maintenance of this hardware now presents very serious problems. The modules used to operate the Experimental Areas are numerous and older than 20 years so many of them cannot be repaired any more and CAMAC is no longer well supported by industry. The fast evolution of technology and a better understanding of the detectors allow a new equipment-oriented approach, which is more favourable for maintenance purposes and presents fewer data handling problems. VME and IP Modules were selected as standard components to implement the new electronics to control and read out the particle detectors. The first application implemented in this way concerns the instrumentation for the Scintillation Counters (formerly referred to as triggers). The fundamental options and the design features will be presented

Real time display of the vertical beam sizes in LEP using the BEXE X-ray detector and fast VME based computers

Fast X-ray detectors based on CdTe photoconductors have been installed in LEP since the beginning of its operation in 1989. The angular divergence of the high energy photons from the synchrotron radiation (x-rays) and the narrow spacing of the 64 photoconductors of the detector allow a good measurement of vertical beam profiles down to an rms beam size of 300 mm. This paper presents some specific parameters and experimental results of an upgrade program in which the local processing power of the front-end electronics has been increased by a factor 50. Such a powerful tool has allowed a real time display of the time evolution of the vertical beam sizes. An online correlation plot between the electron and positron beam sizes (turn by turn) is also displayed. These online video images are available in the LEP control room and are used in daily operation for luminosity optimisation

Extraordinary Offenders in Our Midst: An Evaluation of an American Interpretive Solution and Its Application to Section 745(b) of Canada’s Criminal Code

Engaging a mandatory sentencing regime based on a foreign predicate conviction is aconcept that likely will become increasingly topical as the mass exodus of people from variouscountries becomes more commonplace and the general tendency toward global populationmigration continues to rise. With such movements, prideful nationalistic stances are often pittedagainst more realistic, but sometimes opportunistic, notions regarding the responsibilities thatcome with global citizenship. In the following Article, the author will explore ex juris predicatesentencing jurisprudence, with a particular emphasis on the offense of murder. Ultimately aworkable solution will be proposed for the Canadian legal profession born out of the Americanexperience

Luminosity and Beam Measurements used for Performance Optimisation in the LEP Collider

The vertical beam-beam parameter in LEP reached 0.083 in 1999. In order to achieve and maintain this high performance a number of different observables are continuously monitored and optimised. The beam sizes are measured using X-ray detectors and UV telescopes. The luminosity is determined directly with tungsten-silicon calorimeters and indirectly through an accurate measurement of the beam lifetime. The tune shift is measured from the tune spectrum in collision. Beam-beam deflection scans provide information about the beam sizes and separation at the interaction points. The different measurements are shortly reviewed and their resolution and time response is analysed. Their use for the optimisation of LEP is described

Interpreting undergraduate research posters in the literature classroom

This essay explores the use of undergraduate research posters in English literature classrooms; at the same time, it argues for a scholarship of teaching and learning responsive to how meaning is constructed in the arts and humanities. Our scholarly practice requires interaction with texts and with each other, yet the undergraduate research paper typically does not involve much interaction between peers. The posters disseminate preliminary interpretations of research projects to peers; they are a way to make visible some of the cognitive, affective, and aesthetic aspects of literary research. This essay analyzes student reflections on both the process of creating and the process of presenting research posters before providing “close readings” of several posters. Reading the posters reveals key elements of students’ interactions with literary texts: close reading, integration, negotiation, theoretical generalization, and aesthetic judgment. As the students explored a less familiar genre, disciplinary processes of knowledge creation were defamiliarized and made visible

Guilty By a Nose: \u3ci\u3eThe Queen v. Riesberry\u3c/i\u3e and the Criminalization of Racehorse Doping in Canada

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Troublesome Knowledge of SoTL

This study explores the Scholarship of Teaching and Learning (SoTL) as a form of troublesome knowledge (Perkins 1999) that continues to trouble its practitioners. Forty-eight higher education professionals from six countries described their understanding of SoTL in an online survey; ten individuals participated in follow-up interviews to consider how SoTL experiences shape, support, or hinder academic identity and knowing. We categorize our findings according to the dynamic factors—personal, relational, and contextual—identified by Lieff et al (2012); we argue that SoTL serves to illuminate and expose tensions created by competing values and that these values can lead to, or create, a troublesome space wherein promoting SoTL can be enabling and disabling

Troublesome Knowledge of SoTL

This study explores the Scholarship of Teaching and Learning (SoTL) as a form of troublesome knowledge (Perkins 1999) that continues to trouble its practitioners. Forty-eight higher education professionals from six countries described their understanding of SoTL in an online survey; ten individuals participated in follow-up interviews to consider how SoTL experiences shape, support, or hinder academic identity and knowing. We categorize our findings according to the dynamic factors—personal, relational, and contextual—identified by Lieff et al (2012); we argue that SoTL serves to illuminate and expose tensions created by competing values and that these values can lead to, or create, a troublesome space wherein promoting SoTL can be enabling and disabling