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148 results on '"White, G. R."'

1. Cavity beam position monitor system for the Accelerator Test Facility 2

Author

Kim, Y. I., Ainsworth, R., Aryshev, A., Boogert, S. T., Boorman, G., Frisch, J., Heo, A., Honda, Y., Hwang, W. H., Huang, J. Y., Kim, E. -S., Kim, S. H., Lyapin, A., Naito, T., May, J., McCormick, D., Mellor, R. E., Molloy, S., Nelson, J., Park, S. J., Park, Y. J., Ross, M., Shin, S., Swinson, C., Smith, T., Terunuma, N., Tauchi, T., Urakawa, J., and White, G. R.

Subjects
Physics - Accelerator Physics
Abstract

The Accelerator Test Facility 2 (ATF2) is a scaled demonstrator system for final focus beam lines of linear high energy colliders. This paper describes the high resolution cavity beam position monitor (BPM) system, which is a part of the ATF2 diagnostics. Two types of cavity BPMs are used, C-band operating at 6.423 GHz, and S-band at 2.888 GHz with an increased beam aperture. The cavities, electronics, and digital processing are described. The resolution of the C-band system with attenuators was determined to be approximately 250 nm and 1 m for the S-band system. Without attenuation the best recorded C-band cavity resolution was 27 nm., Comment: 16 pp

Published
2013
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2. The NLC Software Requirements Methodology

Author

White, G. R. and Shoaee, H.

Subjects
Physics - Accelerator Physics
Abstract

We describe the software requirements and development methodology developed for the NLC control system. Given the longevity of that project, and the likely geographical distribution of the collaborating engineers, the planned requirements management process is somewhat more formal than the norm in high energy physics projects. The short term goals of the requirements process are to accurately estimate costs, to decompose the problem, and to determine likely technologies. The long term goal is to enable a smooth transition from high level functional requirements to specific subsystem and component requirements for individual programmers, and to support distributed development. The methodology covers both ends of that life cycle. It covers both the analytical and documentary tools for software engineering, and project management support., Comment: Contributed paper at International Conference on Accelerator and Large Experimental Physics Control Systems - ICALEPCS 2001, San Jose, USA, November 2001 (TUAP042)

Published
2001

8. Electromagnetic background tests for the ILC interaction-point feedback system

Author

Burrows, P. N., Christian, G., Clarke, C., Constance, B., Khah, H. D., Hartin, T., Perry, C., Christina Swinson, Kalinin, A., Arnold, R., Molloy, S., Smith, S., White, G. R., Woods, M., and Ieee

Abstract

We present results obtained with the T-488 experiment at SLAC Endstation A (ESA). A material model of the ILC extraction-fine design was assembled and installed in ESA. The module includes materials representing the mask, beamline calorimeter, and first extraction quadrupole, encompassing a stripline interaction-point feedback system beam position monitor (BPM). The SLAC high-energy electron beam was used to irradiate the module in order to mimic the electromagnetic (EM) backgrounds expected in the ILC interaction region. The impact upon the performance of the feedback BPM was measured, and compared with detailed simulations of its expected response.

Published
2016

9. Design of the ILC prototype FONT4 digital intra-train beam-based feedback system

Author

Burrows, P., Christian, G. B., Hartin, A. F., Dabiri Khah, H., White, G. R., Clarke, C. C., Perry, C., Kalinin, A., Mccormick, D. J., Molloy, S., and Marc Ross

Subjects
Accelerators and Storage Rings
Abstract

3 pp. (2006)., We present the design of the FONT4 digital intra-train beam position feedback system prototype and preliminary results of initial beam tests at the Accelerator Test Facility (ATF) at KEK. The feedback system incorporates a fast analogue beam position monitor (BPM) front-end signal processor, a digital feedback board, and a kicker driver amplifier. The short bunchtrain, comprising 3 electron bunches separated by c. 150ns, in the ATF extraction line was used to test components of the prototype feedback system.

Published
2016
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10. The FONT4 ILC intra-train beam-based digital feedback system prototype

Author

Burrows, P. N., Christian, G., Clarke, C., Constance, B., Khah, H. D., Hartin, T., Perry, C., Christina Swinson, Kalinin, A., Molloy, S., White, G. R., and Ieee

Abstract

We present the design of the FONT4 intra.-train beam-based digital position feedback system prototype. The system incorporates a fast analogue beam position monitor front-end signal processor, a digital feedback board, and a fast kicker-driver amplifier. The system latency goal is less than 150ns. We report preliminary results of beam tests at the Accelerator Test Facility (ATF) at KEK using electron bunches separated by c. 150ns.

Published
2016

11. The Triple Helix model for innovation: A holistic exploration of barriers and enablers

Author

White, G. R., Abd Razak, Azley, and White, G

Subjects
HD2321_Industry, Government, LB2300, Knowledge management, Policy making, Process (engineering), business.industry, Strategy and Management, Supply chain, Management Science and Operations Research, HF5001_Business, JS, Business and International Management, business, Triple helix
Abstract

The Triple Helix model of innovation has attracted considerable attention in both developed and developing economies as an integral policy making tool to enhance innovation and promote economic development (Etzkowitz and Leydesdorff, 1997). Specifically it advocates the strengthening of the collaborative relationships between academia, industry and government to improve innovation. However, no studies have holistically examined the overall barriers and enablers in implementing, and attempting to operationalise, the Triple Helix model. This paper aims to contribute to the study of the Triple Helix model by investigating the main factors that influence the implementation and operationalisation of this model. The discussion begins with a description of the model, highlighting its emphasis on an evolutionary process towards developing the type of interactive collaboration that leads to all three actors achieving long term strategic goals. Following this a discussion of the enablers and barriers in implementing the model is presented.

Published
2015

12. Measurements and simulations of wakefields at the Accelerator Test Facility 2

Author

Snuverink, J., primary, Ainsworth, R., additional, Boogert, S. T., additional, Cullinan, F. J., additional, Lyapin, A., additional, Kim, Y. I., additional, Kubo, K., additional, Kuroda, S., additional, Okugi, T., additional, Tauchi, T., additional, Terunuma, N., additional, Urakawa, J., additional, and White, G. R., additional

Published
2016
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18. The FONT4 ILC intra-train beam-based digital feedback system prototype

Author

Burrows, P. N., Christian, G., Clarke, Christopher, Constance, B., Dabiri Khah, H., Hartin, T., Perry, C., Swinson, C., Kalinin, A., Molloy, S., and White, G. R.

Subjects
Signal processing, Digital signal processor, Monitoring, Electron accelerators, Testing, Latency (audio), Life estimation, law.invention, front-end signal processor, Feedback, Position (vector), law, Prototypes, particle beam diagnostics, digital feedback board, Test facilities, Accelerator Test Facility, Simulation, Physics, FONT4 ILC intratrain beam-based digital position feedback system prototype, Delay, analogue beam position monitor, Amplifier, beam tests, Particle accelerator, particle beam bunching, kicker-driver amplifier, Particle beams, signal processing equipment, electron bunches, Beam (structure)
Abstract

758424 3 pp. (2007)., We present the design of the FONT4 intra-train beam-based digital position feedback system prototype. The system incorporates a fast analogue beam position monitor front-end signal processor, a digital feedback board, and a fast kicker-driver amplifier. The system latency goal is less than 150 ns. We report preliminary results of beam tests at the accelerator test facility (ATF) at KEK using electron bunches separated by c. 150 ns.

Published
2007
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19. Performance of the FONT3 fast analogue intra-train beam-based feedback system at ATF

Author

Burrows, P., Christian, G. B., Hartin, A. F., Dabiri Khah, H., White, G. R., Clarke, C. C., Perry, C., Kalinin, A., Mccormick, D. J., Molloy, S., and Marc Ross

Subjects
Accelerators and Storage Rings
Abstract

3 pp. (2006)., We report results of beam tests of the FONT3 intra- train position feedback system prototype at the Accelerator Test Facility (ATF) at KEK. The feedback system incorporates a novel beam position monitor (BPM) processor with latency below 5 nanoseconds, and a kicker driver amplifier with similar low latency. The 56 nanosecond-long bunchtrain in the ATF extraction line was used to test the prototype feedback system. The achieved latency of 23ns provides a demonstration of intra-train feedback on very short timescales relevant even for the CLIC Linear Collider design.

Published
2006
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21. Isotopic decay of urinary or plasma 3-methylhistidine as a potential biomarker of pathologic skeletal muscle loss

Author

Sheffield-Moore, M., primary, Dillon, E. L., additional, Randolph, K. M., additional, Casperson, S. L., additional, White, G. R., additional, Jennings, K., additional, Rathmacher, J., additional, Schuette, S., additional, Janghorbani, M., additional, Urban, R. J., additional, Hoang, V., additional, Willis, M., additional, and Durham, W. J., additional

Published
2013
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23. Cavity beam position monitor system for the Accelerator Test Facility 2

Author

Kim, Y. I., primary, Ainsworth, R., additional, Aryshev, A., additional, Boogert, S. T., additional, Boorman, G., additional, Frisch, J., additional, Heo, A., additional, Honda, Y., additional, Hwang, W. H., additional, Huang, J. Y., additional, Kim, E-S., additional, Kim, S. H., additional, Lyapin, A., additional, Naito, T., additional, May, J., additional, McCormick, D., additional, Mellor, R. E., additional, Molloy, S., additional, Nelson, J., additional, Park, S. J., additional, Park, Y. J., additional, Ross, M., additional, Shin, S., additional, Swinson, C., additional, Smith, T., additional, Terunuma, N., additional, Tauchi, T., additional, Urakawa, J., additional, and White, G. R., additional

Published
2012
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24. A simplified PERT system

Author

Duncan, J. G, Meyer, H. L, and White, G. R

Subjects
Mechanics
Abstract

Modified PERT technique processes the input data and arranges it in familiar graphic form in a booklet which is issued at periodic intervals. The tabulated data provides readily available information to management personnel concerned with monitoring the progress of a program.

Published
1967

30. Quantum optic techniques for diagnostics of a gradient magnetometer atom interferometer.

Author

White, G. R., Lough, J., Duncan, D., Davis, J. P., and Narducci, F. A.

Subjects
*ATOMS, *MAGNETOMETERS, *INTERFEROMETERS, *MAGNETIC fields, *QUANTUM optics
Abstract

In this article, we highlight some of the problems inherent in fielding an atom interferometer sensor, specifically an atom interferometer gradient magnetometer of the type recently proposed [Davis, J.P.; Narducci, F.A. J. Mod. Opt. 2008, 55, 3173-3185]. In particular, we focus on the problems created by stray magnetic fields. We review some of the quantum optic techniques to measure local magnetic fields for the purpose of nulling them. We also present our implementation of a technique to non-destructively measure the temperature of an atom cloud. We highlight our implementation of these techniques and present our measurements. [ABSTRACT FROM AUTHOR]

Published
2009
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32. Kyoto v WTO: Carbon Tariffs -- Addressing Conflicts Between the Kyoto Protocol and International Trade Rules.

Author

Milner-White, G. R.

Abstract

This article explores conflicts that can arise between domestic measures to implement climate change obligations and international trade rules. It uses as an example recent legislation introduced in the US House of Representatives, the Clean Energy and Security Bill of 2009 (the Waxman-Markey Bill), which establishes a carbon "cap and trade" system. After overviewing the international legal framework, the article analyses the trade-related provisions of the Bill against WTO obligations. It is concludes that these provisions are likely to violate the non-discrimination provisions under the General Agreement on Tariffs and Trade ("GATT") and possibly also the national treatment obligations, but are nevertheless likely to be able to be justified under the environmental exemptions in Article XX of GATT. The analysis demonstrates the significant complexity in designing a system to protect domestic "trade exposed" industry from the costs of climate change mitigation, that is both workable and complies with WTO obligations. The article concludes by examining some possible solutions to existing tensions between trade and environmental objectives in this area. It suggests that the WTO should work towards establishing a comprehensive framework for dealing with WTO-Kyoto conflicts with an effective dispute resolution mechanism. A possible solution may be to seek to amend Article XX of GATT to clarify the status of climate change mitigation measures in relation to GATT's substantive obligations, or the promulgation of a new interpretative decision by the contracting parties to clarify uncertainty about existing environmental exceptions. Without an adequate global consensus on the conflicting goals, there is the likelihood of continued unilateral and uncoordinated domestic action. [ABSTRACT FROM AUTHOR]

Published
2009

39. Sister chromatid induction by β-irradiation from incorporated 3H-thymidine: a paradox explained

Author

Roberts, D. J. H., White, G. R. M., and Ockey, C. H.

Abstract

Sister chromatid exchanges (SCE's) induced by [3H]thymidine (3HdT) of increasing specific activities incorporated over one cycle and 5-bromodeoxyuridine (BrdUrd) over the two following cycles were investigated in synchronised Chinese hamster ovary (CHO) cells. SCEs induced during the first cycle on a T.T template (SCE 1) show little increase with dose compared with those induced in the second cycle on a 3HT.T template (SCE 2) where the linear increase with dose reflects that seen after X irradiation. During the third cycle, SCEs 3.1 and 3.2 are induced on unlabelled T.B or labelled 3HT.B templates respectively. These templates are theoretically present in a 1:1 ratio after random segregation at second metaphase. Over practically the entire dose range however, the ratio 3.1/3.2, which dereased with dose, was >1.0 and similar to the high values obtained by other workers. At increasing times after BrdUrd introduction, the ratio decreased from >1.0 to <1.0. Measurements showed that the expected 50% level of labelled chromosomes at metaphase in the samples could vary between 42%–59%. Cells with >50% labelled chromosomes were more delayed in the cell cycle due to the 3H-irradiation than those with <50%. Early fixations therefore favoured SCE 3.1 while late favoured SCE 3.2. SCEs due to BrdUrd in 3HT.B and T.B templates showed no synergistic interaction with irradiation-induced SCEs. When these BrdUrd-induced SCEs were removed from the totals then the 3H-induced SCE levels in 3HT.T, and 3HT.B templates (SCE 2 and 3.2) were similar and increased at a similar rate with dose. This was 2–3 times faster than in SCE 1 and 3.1 where the SCE levels due to irradiation were again similar but lower than for 2 and 3.2. The ß-irradiation source is therefore most effective in inducing SCEs when present in the replicating fork and considerably less effective when it is just behind the fork (SCE 1) and/or in the surrounding chromosomes in the cell.

Published
1987
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41. Cold Water Survival Suits for Aircrew

Author

AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA), White, G. R., AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA), and White, G. R.

Abstract

Laboratory and sea trials were used to evaluate the effectiveness of three aircrew cold water survival garments: the British Mark 10 suit, the United States CWU 21/P suit, and the Canadian 'U.VIC Thermofloat' jacket. It was concluded that the three alternatives provided similar thermal protection but with regard to several other important features, the U.VIC Thermofloat jacket was superior. Consequently, in this evaluation the U.VIC Thermofloat jacket was shown to provide the most effective form of aircrew protection.

Published
1978

42. Personal Computer Aided Decision Analysis.

Author

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING, White,G R, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING, and White,G R

Abstract

The increasing complexity of today's business and military decisions demand informed decision making at all levels of management. Such decision making must be fully supported by timely and accurate analysis. Computers are well-suited for such analysis. Unfortunately, the large mainframe computers are not flexible or responsive enough for use by most managers in a timely manner. The growing popularity, presence, and capability of microcomputers represents a new opportunity for operations research. These small, low-cost machines can provide much of the computer support needed for decision making by managers and analysts provided that the necessary software tools are developed. This thesis was undertaken to provide a user-oriented decision analysis tool which exploits the advantages of personal computers. Of the many useful quantitative techniques available, the weighting and constraint techniques of multi-objective decision analysis were selected and implemented. Originator-supplied keywords include: Multiobjective linear programming, Microcomputers, Linear programming, Optimization, and Personal computers.

Published
1984

43. An Experimental Comparison of the Readability of Two Digital Altimeters.

Author

AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA), White,G R, AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA), and White,G R

Abstract

Twelve male volunteer subjects with flying experience were required to read one of two digital altimeters while performing a two dimensional tracking task.

Published
1978

45. Cystocele

Author

White, G. R.

Abstract

n/a

Published
1909

46. EFFECT OF POTASH ON THE INTERNAL BLACKENING OF POTATOES.

Author

Boyd, A. E. W. and White, G. R.

Subjects
POTASSIUM fertilizers, POTATO diseases & pests, POTASSIUM deficiency diseases, EFFECT of potassium on plants, TUBERS, PLANTS
Abstract

This article focuses on the effect of potash on the internal blackening of potatoes. Blackening or bluish-black discoloration of parts of the flesh of potato tubers without any external symptoms frequently occurs after bruising, especially when the tubers have lost turgidity. Most damage from this cause occurs late in the storage season, commonly as a result of riddling and generally after sprouting has begun. Most of the investigations into this trouble have been carried out in Holland, where it has been concluded that potatoes grown on potassium-deficient soils are much more susceptible than normal tubers.

Published
1956
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