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  • ASTROPHYSICS  (5)
  • Beam Control, Diagnostics, and Feedback  (2)
  • 78.65  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Dopant-induced excimer laser ablation of poly(tetrafluoroethylene) (1992)
    Springer
    Applied physics 55 (1992), S. 488-493 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55.Gp ; 78.65 ; 81.60.Jw ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Clean ablation of poly(tetrafluoroethylene) (PTFE) at etch rates in excess of 7µm/pulse has been achieved with an excimer laser using 308nm radiation and a 25 ns pulse width. This was accomplished by doping the ultraviolet-transparent PTFE polymer with polyimide. Ablation rates were investigated as a function of fluence in the range from 1 to 12J/cm2 and dopant levels up to 15% (wt/wt). Results show that at a given fluence there exists an optimum absorption coefficient ⇌max, for which maximum ablation rates are achieved. The value of ⇌max was found to decrease with increasing fluence. The relationship between ⇌max and fluence was determined from existing ablation rate models and found to compare favorably with empirical results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00332507
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  • 2
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    Design and performance of a high resolution, low latency stripline beam position monitor system (2015)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2015-03-20
    Beschreibung: Author(s): R. J. Apsimon, D. R. Bett, N. Blaskovic Kraljevic, P. N. Burrows, G. B. Christian, C. I. Clarke, B. D. Constance, H. Dabiri Khah, M. R. Davis, C. Perry, J. Resta López, and C. J. Swinson A high-resolution, low-latency beam position monitor (BPM) system has been developed for use in particle accelerators and beam lines that operate with trains of particle bunches with bunch separations as low as several tens of nanoseconds, such as future linear electron-positron colliders and free-e... [Phys. Rev. ST Accel. Beams 18, 032803] Published Thu Mar 19, 2015
    Schlagwort(e): Beam Control, Diagnostics, and Feedback
    Digitale ISSN: 1098-4402
    Thema: Physik
    Publiziert von American Physical Society (APS)
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  • 3
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    Design and operation of a prototype interaction point beam collision feedback system for the International Linear Collider (2018)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2018-12-18
    Beschreibung: Author(s): R. J. Apsimon, D. R. Bett, N. Blaskovic Kraljevic, R. M. Bodenstein, T. Bromwich, P. N. Burrows, G. B. Christian, B. D. Constance, M. R. Davis, C. Perry, and R. Ramjiawan A high-resolution, intratrain position feedback system has been developed to achieve and maintain collisions at the proposed future electron-positron International Linear Collider (ILC). A prototype has been commissioned and tested with a beam in the extraction line of the Accelerator Test Facility ... [Phys. Rev. Accel. Beams 21, 122802] Published Mon Dec 17, 2018
    Schlagwort(e): Beam Control, Diagnostics, and Feedback
    Digitale ISSN: 1098-4402
    Thema: Physik
    Publiziert von American Physical Society (APS)
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  • 4
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    Hydrodynamic effects in the atmosphere of variable stars (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Numerical models of variable stars are established, using a nonlinear radiative transfer coupled hydrodynamics code. The variable Eddington method of radiative transfer is used. Comparisons are for models of W Virginis, beta Doradus, and eta Aquilae. From these models it appears that shocks are formed in the atmospheres of classical Cepheids as well as W Virginis stars. In classical Cepheids, with periods from 7 to 10 days, the bumps occurring in the light and velocity curves appear as the result of a compression wave that reflects from the star's center. At the head of the outward going compression wave, shocks form in the atmosphere. Comparisons between the hydrodynamic motions in W Virginis and classical Cepheids are made. The strong shocks in W Virginis do not penetrate into the interior as do the compression waves formed in classical Cepheids. The shocks formed in W Virginis stars cause emission lines, while in classical Cepheids the shocks are weaker.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Goddard Space Flight Center Cepheid Modeling; p 71-83
    Format: text
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  • 5
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    Mean colors of Cepheids (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Color observations of Cepheids can be interpreted by a color effective temperature relation to give different T sub e values for each kind of mean color. Here, theoretical colors from numerical integrations of Cepheid pulsations are used to determine the proper method of taking the color mean in order to get, by the color T sub e relation, the correct nonpulsating T sub e.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Goddard Space Flight Center Cepheid Modeling; p 43-55
    Format: text
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  • 6
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    Theoretical mean colors for RR Lyrae variables (1980)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A hydrodynamically pulsating 0.6 solar mass model of a typical RR Lyrae variable was studied with a radiation transport-hydrodynamic computer program to predict theoretical T sub 3 and colors at many phases and to find the proper methods for getting mean colors and the consequent mean effective temperatures. The variable Eddington radiation approximation method was used with gray and with multifrequency absorption coefficients to represent the radiation flow in the outer optically thin layers. Comparison between observed and computed B-V colors indicate that these low Z population 2 models are reasonably accurate using King 1A composition opacities. The well known Oke, Giver, and Searle relation between B-V and T sub e reproduced. Mean colors were found by four different averaging methods. The method that gives a mean color and the mean T sub e closest to the nonpulsating model was the separate intensity means of B and V.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Goddard Space Flight Center Current Probl. in Stellar Pulsation Instabilities; p 293-310
    Format: application/pdf
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  • 7
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    Light curves for bump Cepheids computed with a dynamically zoned pulsation code (1980)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The dynamically zoned pulsation code developed by Castor, Davis, and Davison was used to recalculate the Goddard model and to calculate three other Cepheid models with the same period (9.8 days). This family of models shows how the bumps and other features of the light and velocity curves change as the mass is varied at constant period. The use of a code that is capable of producing reliable light curves demonstrates that the light and velocity curves for 9.8 day Cepheid models with standard homogeneous compositions do not show bumps like those that are observed unless the mass is significantly lower than the 'evolutionary mass.' The light and velocity curves for the Goddard model presented here are similar to those computed independently by Fischel, Sparks, and Karp. They should be useful as standards for future investigators.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Goddard Space Flight Center Current Probl. in Stellar Pulsation Instabilities; p 175-186
    Format: application/pdf
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  • 8
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    On the mass of the Cepheid X Cygni (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Using a new non-Lagrangian hydrodynamic radiation transport code, models of the Cepheid X Cygni have been calculated and compared with new observations. Adopting an effective temperature of 5300 K, the luminosity was varied for stellar masses of 6, 8, and 9 solar masses in order to obtain a period of 16.4d. The results indicate that in order to find reasonable agreement between the light curves as calculated and observed, the mass used in the models must be nearly the evolutionary mass, not some 60% less as found in earlier work for Cepheids with periods from 7d to 10d. In addition, the new observations support the physical reality of the so-called 'artificial viscosity dip'.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 246
    Format: text
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