Search

Your search keyword '"Jaehnig, K."' showing total 105 results
Start Over Author "Jaehnig, K."
105 results on '"Jaehnig, K."'

1. The MaNGA Integral Field Unit Fiber Feed System for the Sloan 2.5 m Telescope

Author

Drory, N., MacDonald, N., Bershady, M. A., Bundy, K., Gunn, J., Law, D. R., Smith, M., Stoll, R., Tremonti, C. A., Wake, D. A., Yan, R., Weijmans, A. M., Byler, N., Cherinka, B., Cope, F., Eigenbrot, A., Harding, P., Holder, D., Huehnerhoff, J., Jaehnig, K., Jansen, T. C., Klaene, M., Paat, A. M., Percival, J., and Sayres, C.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We describe the design, manufacture, and performance of bare-fiber integral field units (IFUs) for the SDSS-IV survey MaNGA (Mapping Nearby Galaxies at APO) on the the Sloan 2.5 m telescope at Apache Point Observatory (APO). MaNGA is a luminosity-selected integral-field spectroscopic survey of 10,000 local galaxies covering 360-1030 nm at R ~ 2200. The IFUs have hexagonal dense packing of fibers with packing regularity of 3 um (RMS), and throughput of 96+/-0.5% from 350 nm to 1 um in the lab. Their sizes range from 19 to 127 fibers (3-7 hexagonal layers) using Polymicro FBP 120:132:150 um core:clad:buffer fibers to reach a fill fraction of 56%. High throughput (and low focal-ratio degradation) is achieved by maintaining the fiber cladding and buffer intact, ensuring excellent surface polish, and applying a multi-layer AR coating of the input and output surfaces. In operations on-sky, the IFUs show only an additional 2.3% FRD-related variability in throughput despite repeated mechanical stressing during plate plugging (however other losses are present). The IFUs achieve on-sky throughput 5% above the single-fiber feeds used in SDSS-III/BOSS, attributable to equivalent performance compared to single fibers and additional gains from the AR coating. The manufacturing process is geared toward mass-production of high-multiplex systems. The low-stress process involves a precision ferrule with hexagonal inner shape designed to lead inserted fibers to settle in a dense hexagonal pattern. The ferrule inner diameter is tapered at progressively shallower angles toward its tip and the final 2 mm are straight and only a few um larger than necessary to hold the desired number of fibers. This process scales to accommodate other fiber sizes and to IFUs with substantially larger fiber count. (Abridged), Comment: 23 pages, 30 figures, AJ accepted

Published
2014
Full Text
View/download PDF

3. Early Results from the Wisconsin H-Alpha Mapper Southern Sky Survey

Author

Haffner, L. M., Reynolds, R. J., Madsen, G. J., Hill, A. S., Barger, K. A., Jaehnig, K. P., Mierkiewicz, E. J., Percival, J. W., and Chopra, N.

Subjects
Astrophysics - Galaxy Astrophysics
Abstract

After a successful eleven-year campaign at Kitt Peak, we moved the Wisconsin H-Alpha Mapper (WHAM) to Cerro Tololo in early 2009. Here we present some of the early data after a few months under southern skies. These maps begin to complete the first all-sky, kinematic survey of the diffuse H-alpha emission from the Milky Way. Much of this emission arises from the Warm Ionized Medium (WIM), a significant component of the ISM that extends a few kiloparsecs above the Galactic disk. While this first look at the data focuses on the H-alpha survey, WHAM is also capable of observing many other optical emission lines, revealing fascinating trends in the temperature and ionization state of the WIM. Our ongoing studies of the physical conditions of diffuse ionized gas will continue from the southern hemisphere following the H-alpha survey. In addition, future observations will cover the full velocity range of the Magellanic Stream, Bridge, and Clouds to trace the ionized gas associated with these neighboring systems., Comment: 4 pages, 2 figures. To appear in "The Dynamic ISM: A celebration of the Canadian Galactic Plane Survey," ASP Conference Series

Published
2010

4. The Wisconsin H-Alpha Mapper Northern Sky Survey

Author

Haffner, L. M., Reynolds, R. J., Tufte, S. L., Madsen, G. J., Jaehnig, K. P., and Percival, J. W.

Subjects
Astrophysics
Abstract

The Wisconsin H-Alpha Mapper (WHAM) has surveyed the distribution and kinematics of ionized gas in the Galaxy above declination -30 degrees. The WHAM Northern Sky Survey (WHAM-NSS) has an angular resolution of one degree and provides the first absolutely-calibrated, kinematically-resolved map of the H-Alpha emission from the Warm Ionized Medium (WIM) within ~ +/-100 km/s of the Local Standard of Rest. Leveraging WHAM's 12 km/s spectral resolution, we have modeled and removed atmospheric emission and zodiacal absorption features from each of the 37,565 spectra. The resulting H-Alpha profiles reveal ionized gas detected in nearly every direction on the sky with a sensitivity of 0.15 R (3 sigma). Complex distributions of ionized gas are revealed in the nearby spiral arms up to 1-2 kpc away from the Galactic plane. Toward the inner Galaxy, the WHAM-NSS provides information about the WIM out to the tangent point down to a few degrees from the plane. Ionized gas is also detected toward many intermediate velocity clouds at high latitudes. Several new H II regions are revealed around early B-stars and evolved stellar cores (sdB/O). This work presents the details of the instrument, the survey, and the data reduction techniques. The WHAM-NSS is also presented and analyzed for its gross properties. Finally, some general conclusions are presented about the nature of the WIM as revealed by the WHAM-NSS., Comment: 42 pages, 14 figures (Fig 6-9 & 14 are full color); accepted for publication in 2003, ApJ, 149; Original quality figures (as well as data for the survey) are available at http://www.astro.wisc.edu/wham/

Published
2003
Full Text
View/download PDF

9. Initial results from the scoop limiter experiment in PDX

Author

Budny, R, Bell, MG, Bol, K, Boyd, D, Buchenauer, D, Cavallo, A, Couture, P, Crowley, T, Darrow, DS, Dylla, HF, Fonck, RJ, Gilpin, R, Goldston, R, Grek, B, Heidbrink, W, Heifetz, D, Jaehnig, K, Johnson, D, Kaita, R, Kaye, SM, Knize, RJ, Kugel, H, LeBlanc, B, Manos, D, Mansfield, D, Mazzucato, E, McBride, T, McCann, R, McCune, D, McGuire, K, Mueller, D, Okabayashi, M, Okano, K, Owens, DK, Post, DE, Reusch, M, Schmidt, G, Sesnic, S, Slusher, D, Strachan, J, Surko, C, Takahashi, H, Tenney, F, Towner, H, Ulrickson, M, and Valley, J

Subjects
Energy, Materials Engineering
Abstract

A particle scoop limiter with a graphite face backed by a 50 liter volume for collecting particles was used in PDX. Experiments were performed to test its particle control and power handling capabilities with up to 5 MW of D° power injected into D+ plasmas. Line average plasma densities of up to 8 × 1013 cm-3 and currents up to 450 kA were obtained. Plasma densities in the scoop channels greater than 2 × 1013 cm-3 and neutral densities in the scoop volume greater than 5 × 1014 cm-3 were observed. There is evidence that recycling may have occurred in the scoop channels for several discharges with large line-averaged plasma density. At beam powers up to 2.5 MW, energy confinement times above 40 ms were deduced from magnetics measurements and from transport analysis. Pressures in the vacuum vessel were in the 10 -5 Torr range, and recycling source neutral densities in the central plasma were low. © 1984.

Published
1984

10. Initial beam emission spectroscopy diagnostic system on HL-2A tokamak

Author

Ke, R., primary, Wu, Y. F., additional, McKee, G. R., additional, Yan, Z., additional, Jaehnig, K., additional, Xu, M., additional, Kriete, M., additional, Lu, P., additional, Wu, T., additional, Morton, L. A., additional, Qin, X., additional, Song, X. M., additional, Cao, J. Y., additional, Ding, X. T., additional, and Duan, X. R., additional

Published
2018
Full Text
View/download PDF

13. Early Results from the Wisconsin H-Alpha Mapper Southern Sky Survey

Author

Lawrence Haffner, Reynolds, R. J., Madsen, G. J., Hill, A. S., Barger, K. A., Jaehnig, K. P., Mierkiewicz, E. J., Percival, J. W., and Chopra, N.

Subjects
Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astrophysics - Astrophysics of Galaxies
Abstract

After a successful eleven-year campaign at Kitt Peak, we moved the Wisconsin H-Alpha Mapper (WHAM) to Cerro Tololo in early 2009. Here we present some of the early data after a few months under southern skies. These maps begin to complete the first all-sky, kinematic survey of the diffuse H-alpha emission from the Milky Way. Much of this emission arises from the Warm Ionized Medium (WIM), a significant component of the ISM that extends a few kiloparsecs above the Galactic disk. While this first look at the data focuses on the H-alpha survey, WHAM is also capable of observing many other optical emission lines, revealing fascinating trends in the temperature and ionization state of the WIM. Our ongoing studies of the physical conditions of diffuse ionized gas will continue from the southern hemisphere following the H-alpha survey. In addition, future observations will cover the full velocity range of the Magellanic Stream, Bridge, and Clouds to trace the ionized gas associated with these neighboring systems., 4 pages, 2 figures. To appear in "The Dynamic ISM: A celebration of the Canadian Galactic Plane Survey," ASP Conference Series

Published
2010

14. THE MANGA INTEGRAL FIELD UNIT FIBER FEED SYSTEM FOR THE SLOAN 2.5 M TELESCOPE

Author

Drory, N., primary, MacDonald, N., additional, Bershady, M. A., additional, Bundy, K., additional, Gunn, J., additional, Law, D. R., additional, Smith, M., additional, Stoll, R., additional, Tremonti, C. A., additional, Wake, D. A., additional, Yan, R., additional, Weijmans, A. M., additional, Byler, N., additional, Cherinka, B., additional, Cope, F., additional, Eigenbrot, A., additional, Harding, P., additional, Holder, D., additional, Huehnerhoff, J., additional, Jaehnig, K., additional, Jansen, T. C., additional, Klaene, M., additional, Paat, A. M., additional, Percival, J., additional, and Sayres, C., additional

Published
2015
Full Text
View/download PDF

16. Detection of Diffuse Interstellar [O II] Emission from the Milky Way Using Spatial Heterodyne Spectroscopy

Author

mierkiee, Mierkiewicz, E. J., Reynolds, R. J., Roesler, F. L., Harlander, J. M., Jaehnig, K. P., mierkiee, Mierkiewicz, E. J., Reynolds, R. J., Roesler, F. L., Harlander, J. M., and Jaehnig, K. P.

Abstract

Using a newly developed spatial heterodyne spectrometer (SHS), we have obtained the first radial velocity resolved emission-line profiles of diffuse [O II] 3726 and 3729 angstrom emission lines from the warm (10,000 K) ionized component of our Galaxy's interstellar medium. These [O II] lines are a principal coolant for this widespread, photoionized gas and are a potential tracer of variations in the gas temperature resulting from unidentified heating processes that appear to be acting within the Galaxy's disk and halo. By spectrally isolating for the first time Galactic [O II] from atmospheric [O II] emission, we were able to detect interstellar [O II] out to 20 degrees from the Galactic equator with intensities that range from tens of rayleighs near the Galactic plane to less than 1 rayleigh at high Galactic latitudes. The [O II] line profiles clearly show structure indicating emission along the lines of sight from both local and more distant interstellar gas. Comparisons of the [O II] intensities with the intensities of [N II] 6584 angstrom and H-alpha 6563 angstrom observed with WHAM indicate that the observed variations in [N II]/H-alpha and [O II]/H-alpha in the diffuse interstellar gas are consistent with variations in temperature and confirm the value of the [O II] observations as a temperature diagnostic for the WIM.

Published
2006

19. Observations of the plasma torus of Jupiter with a Fabry-Perot/charge-coupled device /CCD/ imaging spectrometer

Author

Roesler, F. L, Scherb, F, Oliversen, R, Jaehnig, K, Williams, T, York, D. G, and Jenkins, E. B

Subjects
Lunar And Planetary Exploration
Abstract

A description is presented of the use of a CCD imaging spectrometer which has been employed at a 2.1 m telescope to obtain monochromatic images in the red and near infrared. The system studied was Jupiter's plasma torus which circles the planet with radial extent about 5 RJ and 7 RJ (RJ is the radius of Jupiter). In ground based measurements the torus has been observed in the forbidden emission lines of S(plus) at 6716 A and 6731 A and S(plus plus) at 9531 A. Attention is given to aspects of instrumentation, observations, and performance. It is felt that the particular significance of the obtained results from the instrumental point of view is the demonstration that the CCD is an excellent detector for monochromatic imaging in the near infrared out to at least 10830 A and that pixel binning before readout can produce significantly improved S/N ratios for the study of faint, diffuse sources in cases where readout noise is dominant.

Published
1981

26. ICRF and ICRF plus neutral beam heating experiments on TFTR.

Author

Colestock, P., Cavallo, A., Dorland, W., Hosea, J., Greene, G., Hammett, G., Hendel, H. W., Howell, B., Jaehnig, K., Kaita, R., Medley, S. S., Phillips, C. K., Roquemore, A. L., Schilling, G., Stevens, J., Statton, B., Smithe, D., Ramsey, A., Taylor, G., and Wilson, J. R.

Published
1989
Full Text
View/download PDF

27. Correlations of heat and momentum transport in the TFTR tokamak

Author

Scott, S. D., primary, Arunasalam, V., additional, Barnes, C. W., additional, Bell, M. G., additional, Bitter, M., additional, Boivin, R., additional, Bretz, N. L., additional, Budny, R., additional, Bush, C. E., additional, Cavallo, A., additional, Chu, T. K., additional, Cohen, S. A., additional, Colestock, P., additional, Davis, S. L., additional, Dimock, D. L., additional, Dylla, H. F., additional, Efthimion, P. C., additional, Erhrardt, A. B., additional, Fonck, R. J., additional, Fredrickson, E., additional, Furth, H. P., additional, Goldston, R. J., additional, Greene, G., additional, Grek, B., additional, Grisham, L. R., additional, Hammett, G., additional, Hawryluk, R. J., additional, Hendel, H. W., additional, Hill, K. W., additional, Hinnov, E., additional, Hoffman, D. J., additional, Hosea, J., additional, Howell, R. B., additional, Hsuan, H., additional, Hulse, R. A., additional, Jaehnig, K. P., additional, Janos, A. C., additional, Jassby, D., additional, Jobes, F., additional, Johnson, D. W., additional, Johnson, L. C., additional, Kaita, R., additional, Kieras‐Phillips, C., additional, Kilpatrick, S. J., additional, LaMarche, P. H., additional, LeBlanc, B., additional, Little, R., additional, Manos, D. M., additional, Mansfield, D. K., additional, Mazzucato, E., additional, McCarthy, M. P., additional, McCune, D. C., additional, McGuire, K., additional, McNeill, D. H., additional, Meade, D. M., additional, Medley, S. S., additional, Mikkelsen, D. R., additional, Motley, R., additional, Mueller, D., additional, Murphy, J. A., additional, Nagayama, Y., additional, Nazakian, R., additional, Owens, D. K., additional, Park, H., additional, Ramsey, A. T., additional, Redi, M. H., additional, Roquemore, A. L., additional, Rutherford, P. H., additional, Schilling, G., additional, Schivell, J., additional, Schmidt, G. L., additional, Stevens, J., additional, Stratton, B. C., additional, Stodiek, W., additional, Synakowski, E. J., additional, Tang, W. M., additional, Taylor, G., additional, Timberlake, J. R., additional, Towner, H. H., additional, Ulrickson, M., additional, von Goeler, S., additional, Wieland, R., additional, Williams, M., additional, Wilson, J. R., additional, Wong, K.‐L., additional, Yoshikawa, S., additional, Young, K. M., additional, Zarnstorff, M. C., additional, and Zweben, S. J., additional

Published
1990
Full Text
View/download PDF

28. Local measurements of correlated momentum and heat transport in the TFTR tokamak

Author

Scott, S. D., primary, Diamond, P. H., additional, Fonck, R. J., additional, Goldston, R. J., additional, Howell, R. B., additional, Jaehnig, K. P., additional, Schilling, G., additional, Synakowski, E. J., additional, Zarnstorff, M. C., additional, Bush, C. E., additional, Fredrickson, E., additional, Hill, K. W., additional, Janos, A. C., additional, Mansfield, D. K., additional, Owens, D. K., additional, Park, H., additional, Pautasso, G., additional, Ramsey, A. T., additional, Schivell, J., additional, Tait, G. D., additional, Tang, W. M., additional, and Taylor, G., additional

Published
1990
Full Text
View/download PDF

29. High power neutral beam heating experiments on TFTR with balanced and unbalanced momemtum input

Author

Bitter, M, Arunasalam, V, Bell, M G, Bosch, S, Bretz, N L, Budny, R, Bush, C E, Dimock, D L, Dylla, H F, Efthimion, P C, Fonck, R J, Fredrickson, E, Furth, H P, Gammel, G, Goldston, R J, Grek, B, Grisham, L R, Hammett, G, Hattori, K, Hawryluk, R J, Hendel, H W, Hill, K W, Hinnov, E, Hirayama, T, Howell, R B, Hulse, R A, Hsuan, H, Jaehnig, K P, Jassby, D, Jobes, F C, Johnson, D W, Johnson, L C, Kaita, R, Kamperschroer, R, Kilpatrick, S J, Knize, R J, Kugel, H, LaMarche, P H, LeBlanc, B, Little, R, Manos, D M, Mansfield, D K, and McDermott, S

Published
1987

30. The Wisconsin HaMapper (WHAM): A Brief Review of Performance Characteristics and Early Scientific Results

Author

Reynolds, R. J., Tufte, S. L., Haffner, L. M., Jaehnig, K., and Percival, J. W.

Abstract

Abstract. The Wisconsin HaMapper (WHAM) is a recently completed facility for the detection and study of faint optical emission lines from diffuse ionised gas in the disk and halo of the Galaxy. WHAM consists of a 15 cm diameter Fabry–Perot spectrometer coupled to a 0·6 m ‘telescope’, which provide a 1° diameter beam on the sky and produce a 12 km s-1resolution spectrum within a 200 km s-1spectral window. This facility is now located at Kitt Peak in Arizona and operated remotely from Madison, Wisconsin, 2400 km distant. Early results include a velocity-resolved Hamap of a 70° × 100° region of the sky near the Galactic anticentre, the first detections of Haemission from the M I and A high velocity clouds, and the first detections of [O I] ?6300 and other faint ‘diagnostic’ lines from the warm ionised medium. Through the summer of 1998, WHAM will be devoted almost exclusively to a survey of the northern sky, which will provide maps of the distribution and kinematics of the diffuse HII through the optical Haline in a manner that is analogous to earlier sky surveys of the HI made through the 21 cm line.

Published
1998
Full Text
View/download PDF

31. Soft-x-ray camera for internal shape and current-density measurements on a noncircular tokamak.

Author

Fonck, R. J., Jaehnig, K. P., Powell, E. T., Reusch, M., Roney, P., and Simon, M. P.

Subjects
*TOKAMAKS, *SCINTILLATORS
Abstract

A two-dimensional, tangentially viewing, soft-x-ray pinhole camera has been fabricated to provide internal shape measurements on the PBX-M tokamak. It consists of a scintillator at the focal plane of a foil-filtered pinhole camera, which is, in turn, fiber-optically coupled to an intensified framing video camera (Δ t ≥ 3 ms). Automated data acquisition is performed on a stand-alone image processing system, and data archiving and retrieval take place on an optical disk video recorder. The derivation of the poloidal emission distribution from the measured image is done by fitting to model profiles. [ABSTRACT FROM AUTHOR]

Published
1988
Full Text
View/download PDF

32. Charge exchange recombination spectroscopy measurements of ion temperature and plasma rotation in PBX.

Author

Jaehnig, K. P., Fonck, R. J., Ida, K., and Powell, E. T.

Subjects
*SPECTRUM analysis, *IONS, *CHARGE exchange, *ION recombination
Abstract

The primary diagnostic on PBX for ion temperature measurements is charge exchange recombination spectroscopy of low Z ions, wherein fast neutrals from the heating neutral beams excite spectral lines from highly excited states (n > 4) of hydrogenic O, C, and He via charge exchange collisions with the respective fully stripped ions. Since the neutral beams on PBX provide relatively low-velocity neutrals (i.e., D° beams at 44 keV), best signals are obtained using the near-UV lines of O[sup 7+] (e.g., n = 8-7, 2976 Å). Off-line analysis of the Doppler broadened and shifted line profiles includes nonlinear least-squares fitting to a model line profile, while a simplified on-line fast analysis code permits between-shot data analysis. [ABSTRACT FROM AUTHOR]

Published
1985
Full Text
View/download PDF

33. Utilization of charge exchange recombination spectroscopy for the study of metallic ion transport in TFTR.

Author

Knize, R. J., Fonck, R. J., Howell, R. B., Hulse, R. A., and Jaehnig, K. P.

Subjects
FUSION reactors, CHARGE exchange, Z bosons
Abstract

Charge exchange recombination spectroscopy has been used to observe transitions originating from hydrogen-, helium-, and lithiumlike charge states of medium-Z metallic impurities in TFTR. The temporal and spatial densities of these ions were measured in ohmic and neutral beam heated plasmas. These preliminary results agree with predictions of a transport code. [ABSTRACT FROM AUTHOR]

Published
1988
Full Text
View/download PDF

34. Corrections to charge exchange spectroscopic measurements in TFTR due to energy-dependent excitation rates.

Author

Howell, R. B., Fonck, R. J., Knize, R. J., and Jaehnig, K. P.

Subjects
CHARGE exchange, NUCLEAR excitation
Abstract

The use of charge exchange spectroscopy to determine plasma rotation speeds and ion temperature is complicated by the energy dependence of the excitation cross sections. The Doppler-broadened spectral line shape is distorted by the relative velocity between the neutral hydrogen atoms of the injected beam and impurity ions. The asymmetric nature of the energy dependence of this cross section causes a nonmotional shift of the line center and a nonthermal change in the linewidth. These effects vary with the angles between the beam direction, rotation velocity direction, and direction of the viewing sightline. When viewing two neutral beams at different angles on TFTR, the two measurements of υ[sub φ] (r) show discrepancies of about 20%30% with each other. The calculation of the spectral intensity profiles using the available excitation rates overcorrects these discrepancies and indicates the need for better excitation coefficients. [ABSTRACT FROM AUTHOR]

Published
1988
Full Text
View/download PDF

35. CHERS software system—A microVAX-based diagnostic.

Author

Lagin, L., Schneider, U., Arnold, N., Fonck, R., Jaehnig, K., Roney, P., Davis, W., and Christianson, G.

Subjects
SPECTRUM analysis, TOKAMAKS, VAX computers
Abstract

The charge exchange recombination spectroscopy (CHERS) diagnostic is the first tokamak fusion test reactor (TFTR) diagnostic to utilize a microVAX II computer for device control, data acquisition, analysis, and event-driven processing. The CHERS system is controlled from a single interactive menu-driven process, enabling the diagnostic physicist to perform interactive device control and monitoring, calibration and control file editing, and to control automatic device setup, data acquisition and display, and postshot analysis. All software is written in FORTRAN. Device control is accomplished using the (ORNL) VAX CAMAC and TAU real-time image processing system (RTIPS) FORTRAN subroutines. Standard VAX system services are utilized, including the use of event flags, global sections, logical names, security services, process control, and spawning of subprocesses. [ABSTRACT FROM AUTHOR]

Published
1986
Full Text
View/download PDF

36. SPRED spectrograph upgrade: High-resolution grating and improved absolute calibrations.

Author

Stratton, B. C., Fonck, R. J., Ida, K., Jaehnig, K. P., and Ramsey, A. T.

Subjects
SPECTROGRAPHS, TOKAMAKS, SYNCHROTRON radiation
Abstract

Two improvements to the SPRED multichannel VUV spectrographs used on the TFTR and PBX tokamaks have been made: (1) a new 2100-g/mm grating covering the 100-320-Å region with 0.4-Å resolution (FWHM) has been added to the existing 450-g/mm grating (100-1100 Å with 2-Å resolution), and (2) the TFTR SPRED has been absolutely calibrated using synchrotron radiation from the NBS SURF II facility, while the PBX system has been calibrated using conventional branching ratios along with line ratios from charge-exchange-recombination excited lines. The availability of high-resolution spectra in the 100-320-Å range provides improved measurements of metallic ion emissions and, when the instrument views across a neutral beam as in PBX, allows carbon and oxygen densities to be measured via charge-exchangerecombination spectroscopy. [ABSTRACT FROM AUTHOR]

Published
1986
Full Text
View/download PDF

37. High time resolution ion temperature profile measurements on PBX.

Author

Gammel, G., Kaita, R., Fonck, R., Jaehnig, K., and Powell, E.

Subjects
IONS, TOKAMAKS, CHARGE exchange, SPECTRUM analysis
Abstract

Ion temperature profiles with a time resolution of 2-5 ms have been measured on the Princeton Beta Experiment tokamak (PBX) by charge-exchange recombination spectroscopy (CXRS) and a neutral, particle charge-exchange analyzer (NPA). The sightlines of both diagnostics crossed the trajectory of a near-perpendicular heating beam, which enhanced the local neutral density (∝ signal strength) and provided spatial resolution. The time resolution of these two independent techniques is sufficient to see sawtooth oscillations and other magnetohydrodynamic activity. Effects of these phenomena on the toroidal rotation velocity profile, v[sub φ] (r), are clearly observed by CXRS. For example, a sharp drop in the central υ[sub θ] occurs at the sawtooth crash, followed by a linear rise during the quiescent phase. The NPA results are compared with those from CXRS. [ABSTRACT FROM AUTHOR]

Published
1986
Full Text
View/download PDF

38. Ion thermal confinement in the enhanced-confinement regime of the TFTR tokamak

Author

Fonck, R. J., primary, Howell, R., additional, Jaehnig, K., additional, Roquemore, L., additional, Schilling, G., additional, Scott, S., additional, Zarnstorff, M. C., additional, Bush, C., additional, Goldston, R., additional, Hsuan, H., additional, Johnson, D., additional, Ramsey, A., additional, Schivell, J., additional, and Towner, H., additional

Published
1989
Full Text
View/download PDF

39. Transport and stability studies on TFTR

Author

McGuire, K M, primary, Arunsalam, V, additional, Barnes, C W, additional, Bell, M G, additional, Bitter, M, additional, Bosch, H S, additional, Bretz, N L, additional, Budny, R, additional, Bush, C E, additional, Cavallo, A, additional, Colestock, P, additional, Davis, S L, additional, Dimock, D L, additional, Dylla, H F, additional, Efthimion, P C, additional, Ehrhardt, A, additional, Fonck, R J, additional, Fredrickson, E, additional, Goldston, R J, additional, Greene, G, additional, Grek, B, additional, Grisham, L R, additional, Hammett, G, additional, Hawryluk, R J, additional, Hendel, H W, additional, Hill, K W, additional, Hinnov, E, additional, Howell, R B, additional, Hulse, R A, additional, Hsuan, H, additional, Jaehnig, K P, additional, Jassby, D L, additional, Jobes, F, additional, Johnson, D W, additional, Johson, L C, additional, Kaita, R, additional, Kipatrick, S J, additional, Knize, R J, additional, Kuo-Petravic, G, additional, LaMarche, P H, additional, Manos, D M, additional, Manickam, J, additional, Mansfield, D K, additional, McCarthy, M P, additional, McCann, R T, additional, McCune, D C, additional, McNeill, D H, additional, Meade, D M, additional, Medley, S S, additional, Mikkelsen, D R, additional, Miller, A, additional, Morris, W, additional, Mueller, D, additional, Nieschmidt, E B, additional, Owens, D K, additional, Park, H, additional, Pomphrey, N, additional, Ramsey, A T, additional, Redi, M H, additional, Roquemore, A L, additional, Saito, T, additional, Sauthoff, N R, additional, Schilling, G, additional, Schivell, J, additional, Schmidt, G L, additional, Scott, S D, additional, Sinnis, J C, additional, Stevens, J, additional, Stodiek, W, additional, Stratton, B C, additional, Tait, G D, additional, Taylor, G, additional, Timberlake, J R, additional, Towner, H H, additional, Ulrickson, M, additional, Goeler, S von, additional, Wieland, R, additional, Williams, M, additional, Wong, K -L, additional, Yoshikawa, S, additional, Young, K M, additional, Zarnstorff, M C, additional, and Zweben, S J, additional

Published
1988
Full Text
View/download PDF

41. High-temperature plasmas in a tokamak fusion test reactor

Author

Strachan, J. D., primary, Bitter, M., additional, Ramsey, A. T., additional, Zarnstorff, M. C., additional, Arunasalam, V., additional, Bell, M. G., additional, Bretz, N. L., additional, Budny, R., additional, Bush, C. E., additional, Davis, S. L., additional, Dylla, H. F., additional, Efthimion, P. C., additional, Fonck, R. J., additional, Fredrickson, E., additional, Furth, H. P., additional, Goldston, R. J., additional, Grisham, L. R., additional, Grek, B., additional, Hawryluk, R. J., additional, Heidbrink, W. W., additional, Hendel, H. W., additional, Hill, K. W., additional, Hsuan, H., additional, Jaehnig, K. P., additional, Jassby, D. L., additional, Jobes, F., additional, Johnson, D. W., additional, Johnson, L. C., additional, Kaita, R., additional, Kampershroer, J., additional, Knize, R. J., additional, Kozub, T., additional, LeBlanc, B., additional, Levinton, F., additional, La Marche, P. H., additional, Manos, D. M., additional, Mansfield, D. K., additional, McGuire, K., additional, McNeill, D. H., additional, Meade, D. M., additional, Medley, S. S., additional, Morris, W., additional, Mueller, D., additional, Nieschmidt, E. B., additional, Owens, D. K., additional, Park, H., additional, Schivell, J., additional, Schilling, G., additional, Schmidt, G. L., additional, Scott, S. D., additional, Sesnic, S., additional, Sinnis, J. C., additional, Stauffer, F. J., additional, Stratton, B. C., additional, Tait, G. D., additional, Taylor, G., additional, Towner, H. H., additional, Ulrickson, M., additional, von Goeler, S., additional, Wieland, R., additional, Williams, M. D., additional, Wong, K-L., additional, Yoshikawa, S., additional, Young, K. M., additional, and Zweben, S. J., additional

Published
1987
Full Text
View/download PDF

42. Gas fueling studies in the PDX tokamak: II

Author

Dylla, H.F., primary, Bell, M.G., additional, Fonck, R.J., additional, Jaehnig, K., additional, Kaye, S.M., additional, Owens, D.K., additional, Heifetz, D.B., additional, and Schmidt, G.L., additional

Published
1984
Full Text
View/download PDF

43. High-βPlasmas in the PBX Tokamak

Author

Bol, K., primary, Buchenauer, D., additional, Chance, M., additional, Couture, P., additional, Fishman, H., additional, Fonck, R., additional, Gammel, G., additional, Grek, B., additional, Ida, K., additional, Itami, K., additional, Jaehnig, K., additional, Jahns, G., additional, Johnson, D., additional, Kaita, R., additional, Kaye, S., additional, Kugel, H., additional, LeBlanc, B., additional, Manickam, J., additional, McGuire, K., additional, Ohyabu, N., additional, Okabayashi, M., additional, Powell, E., additional, Reusch, M., additional, Schmidt, G., additional, Sesnic, S., additional, Takahashi, H., additional, and Tenney, F., additional

Published
1986
Full Text
View/download PDF

45. Particle fueling and impurity control in PDX

Author

Fonck, R.J., primary, Bell, M., additional, Bol, K., additional, Budny, R., additional, Couture, P., additional, Darrow, D., additional, Dylla, H., additional, Goldston, R., additional, Grek, B., additional, Hawryluk, R., additional, Ida, K., additional, Jaehnig, K., additional, Johnson, D., additional, Kaita, R., additional, Kaye, S., additional, Kugel, H., additional, Leblanc, B., additional, Mansfield, D., additional, Mcbride, T., additional, Mcguire, K., additional, Milora, S., additional, Mueller, D., additional, Okabayashi, M., additional, Owens, D., additional, Post, D., additional, Reusch, M., additional, Schmidt, G., additional, Sesnic, S., additional, Takahashi, H., additional, Tenney, F., additional, and Ulrickson, M., additional

Published
1984
Full Text
View/download PDF

47. Canola Oil May Offer Multiple Benefits To Fish Farmers.

Author

Jaehnig, K. C.

Subjects
*RESEARCH, *OMEGA-3 fatty acids, *CANOLA oil, *STRIPED bass
Abstract

Presents information on a study being conducted by scientists at Southern Illinois University in Carbondale regarding ways to boost levels of omega-3 long chain fatty acids in a hybrid of striped bass. Benefits of canola oil for fish farmers; Statement issued by Christopher C. Kohler, director of Fisheries and Illinois Aquaculture Center at the university, regarding the use of fish oil; Value of the grant provided for the study.

Published
2004

49. Research Could Lead To Healthier Humans, Fish.

Author

Jaehnig, K. C.

Subjects
*FISH farming, *RESEARCH, *OMEGA-3 fatty acids
Abstract

Presents information on a research project that will focus on the development of a cost-effective means of increasing the levels of omega-3 fatty acids in farm-raised fish. Benefits of the project; Nutritional benefit of fishes with high levels of polyunsaturated fats; Value of the research grant for the project.

Published
2003

Catalog

Books, media, physical & digital resources
See catalog results