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102 results on '"Jenkins, M. J."'

1. Production of antihydrogen at reduced magnetic field for anti-atom trapping

Author

Andresen, G B, Bertsche, W, Boston, A, Bowe, P D, Cesar, C L, Chapman, S, Charlton, M, Chartier, M, Deutsch, A, Fajans, J, Fujiwara, M C, Funakoshi, R, Gill, D R, Gomberoff, K, Hangst, J S, Hayano, R S, Hydomako, R, Jenkins, M J, Jorgensen, L V, Kurchaninov, L, Madsen, N, Nolan, P, Olchanski, K, Olin, A, Page, R D, Povilus, A, Robicheaux, F, Sarid, E, Silveira, D M, Storey, J W, Thompson, R I, van derWerf, D P, Wurtele, J S, and Yamazaki, Y

Subjects
Nuclear Experiment
Abstract

We have demonstrated production of antihydrogen in a 1$,$T solenoidal magnetic field. This field strength is significantly smaller than that used in the first generation experiments ATHENA (3$,$T) and ATRAP (5$,$T). The motivation for using a smaller magnetic field is to facilitate trapping of antihydrogen atoms in a neutral atom trap surrounding the production region. We report the results of measurements with the ALPHA (Antihydrogen Laser PHysics Apparatus) device, which can capture and cool antiprotons at 3$,$T, and then mix the antiprotons with positrons at 1$,$T. We infer antihydrogen production from the time structure of antiproton annihilations during mixing, using mixing with heated positrons as the null experiment, as demonstrated in ATHENA. Implications for antihydrogen trapping are discussed.

Published
2008
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2. A novel antiproton radial diagnostic based on octupole induced ballistic loss

Author

Andresen, G. B., Bertsche, W., Bowe, P. D., Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jorgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Nasr, S. Seif El, Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Subjects
Physics - Atomic Physics, Nuclear Experiment
Abstract

We report results from a novel diagnostic that probes the outer radial profile of trapped antiproton clouds. The diagnostic allows us to determine the profile by monitoring the time-history of antiproton losses that occur as an octupole field in the antiproton confinement region is increased. We show several examples of how this diagnostic helps us to understand the radial dynamics of antiprotons in normal and nested Penning-Malmberg traps. Better understanding of these dynamics may aid current attempts to trap antihydrogen atoms.

Published
2008
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3. Compression of Antiproton Clouds for Antihydrogen Trapping

Author

Andresen, G. B., Bertsche, W., Bowe, P. D., Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Hydomako, R., Jenkins, M. J., Jorgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Nasr, S. Seif El, Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Subjects
Nuclear Experiment
Abstract

Control of the radial profile of trapped antiproton clouds is critical to trapping antihydrogen. We report the first detailed measurements of the radial manipulation of antiproton clouds, including areal density compressions by factors as large as ten, by manipulating spatially overlapped electron plasmas. We show detailed measurements of the near-axis antiproton radial profile and its relation to that of the electron plasma.

Published
2008
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4. Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN

Author

ALPHA Collaboration, Fujiwara, M. C., Andresen, G. B., Bertsche, W., Bowe, P. D., Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Funakoshi, R., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jorgensen, L. V., Kurchaninov, L., Lai, W., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Nasr, S. Seif El, Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wasilenko, L., Wurtele, J. S., and Yamazaki, Y.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment, Physics - Atomic Physics
Abstract

We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN's Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. We argue that initial spectroscopy measurements, once antihydrogen is trapped, could provide competitive tests of CPT, possibly probing physics at the Planck Scale. We discuss some of the particle detection techniques used in ALPHA. Preliminary results from commissioning studies of a partial system of the ALPHA Si vertex detector are presented, the results of which highlight the power of annihilation vertex detection capability in antihydrogen studies., Comment: Invited talk at Pbar08 - Workshop on Cold Antimatter Plasmas and Application to Fundamental Physics, Okinawa, Japan, 2008. 14 pages, 8 figures

Published
2008
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5. Towards Antihydrogen Confinement with the ALPHA Antihydrogen Trap

Author

Fujiwara, M. C., Andresen, G., Bertsche, W., Boston, A., Bowe, P. D., Cesar, C. L., Chapman, S., Charlton, M., Chartier, M., Deutsch, A., Fajans, J., Funakoshi, R., Gill, D. R., Gomberoff, K., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hydomako, R., Jenkins, M. J., Jorgensen, L. V., Kurchaninov, L., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Robicheaux, F., Sarid, E., Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Physics - Atomic Physics, Physics - Plasma Physics
Abstract

ALPHA is an international project that has recently begun experimentation at CERN's Antiproton Decelerator (AD) facility. The primary goal of ALPHA is stable trapping of cold antihydrogen atoms with the ultimate goal of precise spectroscopic comparisons with hydrogen. We discuss the status of the ALPHA project and the prospects for antihydrogen trapping., Comment: Invited talk at International Conference on Trapped Charged Particles and Fundamental Physics: TCP06, Parksville, BC, Canada, September 2006. To be published in Hyperfine Interactions

Published
2007
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7. Trapped antihydrogen

Author

Butler, E., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Cesar, C. L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jonsell, S., Jørgensen, L. V., Kemp, S. L., Kurchaninov, L., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Rasmussen, C. Ø., Robicheaux, F., Sarid, E., Seif el Nasr, S., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., Yamazaki, Y., and ALPHA Collaboration

Published
2012
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9. Towards antihydrogen confinement with the ALPHA antihydrogen trap

Author

Fujiwara, M. C., Andresen, G., Bertsche, W., Boston, A., Bowe, P. D., Cesar, C. L., Chapman, S., Charlton, M., Chartier, M., Deutsch, A., Fajans, J., Funakoshi, R., Gill, D. R., Gomberoff, K., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hydomako, R., Jenkins, M. J., Jørgensen, L. V., Kurchaninov, L., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Robicheaux, F., Sarid, E., Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Published
2006
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12. Towards antihydrogen confinement with the ALPHA antihydrogen trap

Author

Fujiwara, M. C., primary, Gill, D. R., additional, Kurchaninov, L., additional, Olchanski, K., additional, Olin, A., additional, Storey, J. W., additional, Andresen, G., additional, Bowe, P. D., additional, Hangst, J. S., additional, Bertsche, W., additional, Chapman, S., additional, Deutsch, A., additional, Fajans, J., additional, Povilus, A., additional, Wurtele, J. S., additional, Boston, A., additional, Chartier, M., additional, Nolan, P., additional, Page, R. D., additional, Cesar, C. L., additional, Silveira, D. M., additional, Charlton, M., additional, Jenkins, M. J., additional, Jørgensen, L. V., additional, Madsen, N., additional, van der Werf, D. P., additional, Funakoshi, R., additional, Hayano, R. S., additional, Gomberoff, K., additional, Hardy, W. N., additional, Hydomako, R., additional, Thompson, R. I., additional, Robicheaux, F., additional, Sarid, E., additional, and Yamazaki, Y., additional

Published
2007
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13. Trapped antihydrogen

Author

Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jonsell, S., Jørgensen, L. V., Kurchaninov, L., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Nasr, S. Seif el, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Published
2010
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19. The ALPHA antihydrogen trapping apparatus

Author

Amole, C., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Capra, A., Carpenter, P. T., Cesar, C. L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Escallier, J., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hurt, J. L., Hydomako, R., Isaac, C. A., Jenkins, M. J., Jonsell, Svante, Jörgensen, L. V., Kerrigan, S. J., Kurchaninov, L., Madsen, N., Morone, A., McKenna, J. T. K., Menary, S., Nolan, P., Olchanski, K., Olin, A., Parker, B., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Seddon, D., El Nasr, S. Seif, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., Thornhill, J., Wells, D., van der Werf, D. P., Wurtele, J. S., Yamazaki, Y., Amole, C., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Capra, A., Carpenter, P. T., Cesar, C. L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Escallier, J., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hurt, J. L., Hydomako, R., Isaac, C. A., Jenkins, M. J., Jonsell, Svante, Jörgensen, L. V., Kerrigan, S. J., Kurchaninov, L., Madsen, N., Morone, A., McKenna, J. T. K., Menary, S., Nolan, P., Olchanski, K., Olin, A., Parker, B., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Seddon, D., El Nasr, S. Seif, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., Thornhill, J., Wells, D., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Abstract

The ALPHA collaboration, based at CERN, has recently succeeded in confining cold antihydrogen atoms in a magnetic minimum neutral atom trap and has performed the first study of a resonant transition of the anti-atoms. The ALPHA apparatus will be described herein, with emphasis on the structural aspects, diagnostic methods and techniques that have enabled antihydrogen trapping and experimentation to be achieved., AuthorCount:56

Published
2014
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20. Towards trapped antihydrogen

Author

Jørgensen, L. V., Andresen, Gorm, Bertsche, W., Boston, A., Bowe, Paul David, Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, Jeffrey S., Hayano, R. S., Hydomako, R., Jenkins, M. J., Kurchaninov, L., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Robicheaux, F., Sarid, E., Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Yamazaki, Y., and Collaboration, ALPHA

Published
2008

21. First attempts at antihydrogen trapping in ALPHA

Author

Andresen, Gorm, Bertsche, W., Bowe, Paul David, Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, Jeffrey S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jørgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., El Nasr, S. S., Silveira, D. M., Storey, J. W., Thompson, R. I., Werf, D. P. D., Wurtele, J. S., and Yamazaki, Y.

Published
2008

22. Antiproton compression and radial measurements

Author

Andresen, Gorm, Bertsche, W., Bowe, Paul David, Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, Jeffrey S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jørgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Seif El Nasr, S., Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Published
2008

25. The ALPHA-detector : Module Production and Assembly

Author

Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jonsell, Svante, Jorgensen, L. V., Kurchaninov, L., Madsen, N., McKenna, J. T. K., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sampson, J., Sarid, E., Seddon, D., el Nasr, S. Seif, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., Thornhill, J., Wells, D., van der Werf, D. P., Wurtele, J. S., Yamazaki, Y., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jonsell, Svante, Jorgensen, L. V., Kurchaninov, L., Madsen, N., McKenna, J. T. K., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sampson, J., Sarid, E., Seddon, D., el Nasr, S. Seif, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., Thornhill, J., Wells, D., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Abstract

ALPHA is one of the experiments situated at CERN's Antiproton Decelerator (AD). A Silicon Vertex Detector (SVD) is placed to surround the ALPHA atom trap. The main purpose of the SVD is to detect and locate antiproton annihilation events by means of the emitted charged pions. The SVD system is presented with special focus given to the design, fabrication and performance of the modules., AuthorCount:47

Published
2012
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26. Management of Lodgepole Pine Stand Density to Reduce Susceptibility to Mountain Pine Beetle Attack

Author

Anhold, J A, Jenkins, M J, and Long, J N

Subjects
Wood Science and Pulp, Paper Technology, silvicultural treatments, Ecology and Evolutionary Biology, beetle resistance, Forest Biology, tree density, Entomology, Forest Management, Forest Sciences
Abstract

Silvicultural strategies to reduce tree losses from mountain pine beetle attacks typically seek to reduce relative densities in order to increase tree resistance and thus lower potential beetle attacks. For lodgepole pine stands, however, the tree mortality/relative density relationship is nonlinear. We describe three relative density zones corresponding to different levels of resistance to beetle attack. In the density management of young lodgepole pine stands, we propose two alternative strategies to reduce future losses from mountain pine beetle attacks. The first density management regime involves a low density throughout the rotation. The second density management regime is designed to maintain relative density above a threshold level.

Published
1996

27. The ALPHA – detector: Module Production and Assembly

Author

Andresen, G B, primary, Ashkezari, M D, additional, Baquero-Ruiz, M, additional, Bertsche, W, additional, Bowe, P D, additional, Butler, E, additional, Cesar, C L, additional, Chapman, S, additional, Charlton, M, additional, Deller, A, additional, Eriksson, S, additional, Fajans, J, additional, Friesen, T, additional, Fujiwara, M C, additional, Gill, D R, additional, Gutierrez, A, additional, Hangst, J S, additional, Hardy, W N, additional, Hayden, M E, additional, Humphries, A J, additional, Hydomako, R, additional, Jenkins, M J, additional, Jonsell, S, additional, JØrgensen, L V, additional, Kurchaninov, L, additional, Madsen, N, additional, McKenna, J T K, additional, Menary, S, additional, Nolan, P, additional, Olchanski, K, additional, Olin, A, additional, Povilus, A, additional, Pusa, P, additional, Robicheaux, F, additional, Sampson, J, additional, Sarid, E, additional, Seddon, D, additional, Nasr, S Seif el, additional, Silveira, D M, additional, So, C, additional, Storey, J W, additional, Thompson, R I, additional, Thornhill, J, additional, Wells, D, additional, Werf, D P van der, additional, Wurtele, J S, additional, and Yamazaki, Y, additional

Published
2012
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31. Antihydrogen Physics at ALPHA/CERNThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

Author

Cesar, C. L., primary, Andresen, G. B., additional, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Humphries, A. J., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jørgensen, L. V., additional, Kurchaninov, L., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Page, R. D., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, El Nasr, S. Seif, additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, and Yamazaki, Y., additional

Published
2009
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34. Compression of Antiproton Clouds for Antihydrogen Trapping

Author

Andresen, G. B., primary, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jørgensen, L. V., additional, Kurchaninov, L., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, Seif El Nasr, S., additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, and Yamazaki, Y., additional

Published
2008
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35. A novel antiproton radial diagnostic based on octupole induced ballistic loss

Author

Andresen, G. B., primary, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Humphries, A. J., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jørgensen, L. V., additional, Kurchaninov, L., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Page, R. D., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, El Nasr, S. Seif, additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, and Yamazaki, Y., additional

Published
2008
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36. Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN

Author

Fujiwara, M. C., primary, Andresen, G. B., additional, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Humphries, A. J., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jo̸rgensen, L. V., additional, Kurchaninov, L., additional, Lai, W., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, El Nasr, S. Seif, additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wasilenko, L., additional, Wurtele, J. S., additional, Yamazaki, Y., additional, Kanai, Yasuyuki, additional, and Yamazaki, Yasunori, additional

Published
2008
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37. First Attempts at Antihydrogen Trapping in ALPHA

Author

Andresen, G. B., primary, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Humphries, A. J., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jo̸rgensen, L. V., additional, Kurchaninov, L., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Page, R. D., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, El Nasr, S. Seif, additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, Yamazaki, Y., additional, Kanai, Yasuyuki, additional, and Yamazaki, Yasunori, additional

Published
2008
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38. Antiproton compression and radial measurements

Author

Andresen, G. B., primary, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Humphries, A. J., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jo̸rgensen, L. V., additional, Kurchaninov, L., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Page, R. D., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, El Nasr, S. Seif, additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, Yamazaki, Y., additional, Kanai, Yasuyuki, additional, and Yamazaki, Yasunori, additional

Published
2008
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39. Production of antihydrogen at reduced magnetic field for anti-atom trapping

Author

Andresen, G B, primary, Bertsche, W, additional, Boston, A, additional, Bowe, P D, additional, Cesar, C L, additional, Chapman, S, additional, Charlton, M, additional, Chartier, M, additional, Deutsch, A, additional, Fajans, J, additional, Fujiwara, M C, additional, Funakoshi, R, additional, Gill, D R, additional, Gomberoff, K, additional, Hangst, J S, additional, Hayano, R S, additional, Hydomako, R, additional, Jenkins, M J, additional, Jørgensen, L V, additional, Kurchaninov, L, additional, Madsen, N, additional, Nolan, P, additional, Olchanski, K, additional, Olin, A, additional, Page, R D, additional, Povilus, A, additional, Robicheaux, F, additional, Sarid, E, additional, Silveira, D M, additional, Storey, J W, additional, Thompson, R I, additional, van der Werf, D P, additional, Wurtele, J S, additional, and Yamazaki, Y, additional

Published
2007
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40. Antimatter Plasmas in a Multipole Trap for Antihydrogen

Author

Andresen, G., primary, Bertsche, W., additional, Boston, A., additional, Bowe, P. D., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Chartier, M., additional, Deutsch, A., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Gomberoff, K., additional, Hangst, J. S., additional, Hayano, R. S., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jørgensen, L. V., additional, Kurchaninov, L., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Povilus, A., additional, Robicheaux, F., additional, Sarid, E., additional, Silveira, D. M., additional, Storey, J. W., additional, Telle, H. H., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, and Yamazaki, Y., additional

Published
2007
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44. Optimisation of bonding for bicycle wheel sandwich structures.

Author

Caton, C. J., Jenkins, M. J., and Strangwood, M.

Subjects
STRAINS & stresses (Mechanics), HEAT treatment, ADHESIVES, SHEAR (Mechanics), CARBON fibers
Abstract

In order to reduce weight in disc bicycle wheels (foam core and carbon fibre composite skin) surface modification of the core by heat treatment to reduce resin uptake was investigated. For the selected polymethacrylimide (PMI) closed cell foam the open surface cells were compacted by a treatment of 5 minutes at 212 °C under a stress of 490.5 MPa without affecting the bulk cells. Sandwich beams fabricated using heat treated cores gave stiffness and specific stiffness values in the same population as for the untreated foam core beams, but with 14 % less uptake of resin from the adhesive interlayer. The shear strength values and failure mode were unaffected by core heat treatment indicating that wheel mass could be reduced by around 45 g with no loss in mechanical performance. [ABSTRACT FROM AUTHOR]

Published
2004

47. Mechanical and acoustic frequency responses in flat hot‐compacted polyethylene and polypropylene panels

Author

Jenkins, M. J., Hine, P. J., Hay, J. N., and Ward, I. M.

Abstract

A range of flat hot‐compacted single‐polymer composite panels made from oriented polypropylene and polyethylene with differing dynamic modulus and damping capacity were freely suspended and subjected to mechanical excitation, allowing their acoustic frequency response over the audio bandwidth to be measured. The audio response over selected bands was correlated with the dynamic modulus and damping capacity measured in bending in these materials and compared with the response of a traditional composite material, namely, carbon‐fiber‐reinforced epoxy resin. Low damping and high dynamic modulus were found to result in relatively high output levels from the hot‐compacted flat panels, which contrasted with the results previously measured on a traditional cone‐shaped speaker made from a hot‐compacted polypropylene material, which found high damping to be advantageous. The results of the current study on flat panels are explained in terms of mechanical impedance of the panels and their corresponding efficiency. It was concluded that the best flat‐panel audio response came from compacted polyethylene sheets, which combined high stiffness, low density, and a low level of damping. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006

Published
2006
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50. Douglas-Fir Beetle (Dendroctonus pseudotsugae Hopkins, Coleoptera : Scolytidae) Brood Production on Douglas-Fir Defoliated by Western Spruce Budworm (Choristoneura occidentalis Freeman, Lepidoptera : Tortricidae) in Logan Canyon, Utah

Author

Fredricks, S E and Jenkins, M J

Subjects
defoliation, Wood Science and Pulp, Paper Technology, Ecology and Evolutionary Biology, emergence, survey, Forest Biology, Entomology, Forest Management, Forest Sciences, pupal survival
Abstract

Douglas-fir beetle brood production was studied on Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) trees defoliated by the western spruce budworm between 1983 and 1985. Tallies were made of the number of attacks, total length and number of egg galleries, number of eggs deposited, number of larval tunnels, number of pupal chambers, and number of emerging beetles (per female and per unit area). Data analysis showed no significant differences among the three years studied. The number of emerging beetles per female parent was 0.59, and emergence per 90 cm2 was 2.32 beetles. Egg, larval, and pupal survivals were 47.5%, 30.0%, and 15.5%, respectively.

Published
1988

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