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A free-standing thin foil bolometer for measuring soft x-ray fluence
W. A. Stygar, H. C. Ives, D. L. Fehl, M. E. Cuneo, M. G. Mazarakis, J. E. Bailey, G. R. Bennett, D. E. Bliss, G. A. Chandler, R. J. Leeper, M. K. Matzen, D. H. McDaniel, J. S. McGurn, and J. L. McKenney, Phys. Rev. E 69, 046403 (2004).
D. L. Fehl, G. A. Chandler, W. A. Stygar, R. E. Olson, C. L. Ruiz, J. J. Hohlfelder, L. P. Mix, F. Biggs, M. Berninger, P. O. Frederickson, and R. Frederickson, Phys. Rev. Spec. Top.–Accel. Beams 13, 120402 (2010).
G. A. Chandler, C. Deeney, M. Cuneo, D. L. Fehl, J. S. McGurn, R. B. Spielman, J. A. Torres, J. L. McKenney, J. Mills, and K. W. Struve, Rev. Sci. Instrum. 70, 561 (1999).
M. C. Jones, D. J. Ampleford, M. E. Cuneo, R. Hohlfelder, C. A. Jennings, D. W. Johnson, B. Jones, M. R. Lopez, J. MacArthur, J. A. Mills, T. Preston, G. A. Rochau, M. Savage, D. Spencer, D. B. Sinars, and J. L. Porter, Rev. Sci. Instrum. 85, 083501 (2014).
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A free-standing thin foil bolometer for measuring soft x-ray fluence in z-pinch experiments is developed. For the first time, we present the determination of its sensitivity by different methods. The results showed great consistency for the different methods, which confirms the validity of the sensitivity and provides confidence for its application in z-pinch experiments. It should be highlighted that the sensitivity of a free-standing foil bolometer could be calibrated directly using Joule heating without any corrections that will be necessary for a foil bolometer with substrate because of heat loss. The difference of the waveforms between the free-standing foil bolometer and that with substrate is obvious. It reveals that the heat loss to the substrate should be considered for the latter in despite of the short x-ray pulse when the peak value is used to deduce the total deposited energy. The quantitative influence is analyzed through a detailed simulation.
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