Stammet al.Respond

Abstract

Stamm et al. Respond: The critical Comment byApruzese et al l does not seem to give convincing arguments against the existence of a strong iondynamical effect in inertial-confinement-fusion conditions. The observation of Lyman-/3 (L^) dips in laser-driven pellet implosions (their Refs. 2-6) is not in contradiction with our first calculation of L^ for hydrogenic argon perturbed by protons for N e = 1.5 x 10 23 cm -3 and r e = 10 7 K. Indeed, the effect of ion dynamics strongly depends 2 on the choice of Z e , Z p , N e9 T e , and M . For A^ = 4xl0 23 cm" 3 , T e = 800 eV, Z p = 1 (deuteron perturbers), we have recently used our model to obtain a hydrogenic argon L^ profile displaying a distinct dip in the center of the line. 3 This calculation (corresponding to Ref. 5 of the Comment) demonstrates that the observation of a dip on L^ strongly depends on the physical parameters of the experiment. On the other hand, our L a , L^, and L y line profiles for these conditions are still very different, in their central part, from the profiles which use static ions. This indicates that it is possible to observe a strong influence of ion dynamics even when a dip is observed on L^.

Ion-Dynamics Effect on Hydrogenic Stark Profiles in Hot and Dense Plasmas

“…4 of Ref. 18, namely that ion dynamics are important only within a frequency interval Aco^ around the center of each Stark component and, outside this range, the static-ion approximation is valid. For hydrogenic-ion radiators, the Weisskopf frequency is equal to Aa>^ = ZJiv 2 / l.5nqa 0 e 2 , where n q is the principal quantum number for the excited state and a 0 is the Bohr radius.…”

“…18 ' 19 The electrons are treated with an impact theory and the ion contribution is obtained by computer simulation. The line shape is given by the Fourier transform of the emitter dipole autocorrelation function 18,19 :…”

“…The influence of ion dynamics is much greater for the ion lines considered in this paper than it was for the neutral lines considered previously. 18,19 To explain this difference, we use the argument presented in Sec. 4 of Ref.…”

“…For hydrogenic-ion radiators, the Weisskopf frequency is equal to Aa>^ = ZJiv 2 / l.5nqa 0 e 2 , where n q is the principal quantum number for the excited state and a 0 is the Bohr radius. For the L a calculation, in the case of neutral emitters, 18,19 the ratio of Ao>^ to the average Stark splitting Ao> 5 (Aco s -H" l de 0 , where d is a typical element of the dipole operator) is Aco^/ Aa> 5 = \, and the halfwidth was found to increase by a factor of 2. For the L a line in Fig.…”

Plasma-density evolution in compact polyacetal capillary discharges

“…On the other hand, neglecting ion motion requires that the width of the line be much larger than the typical fluctuation frequency of the ion microfield. Since the breakdown of the static approximation has been found to occur for hydrogenic emitters in dense plasma conditions [20,21], careful check for the validity of this approximation has been performed for the transitions calculated.…”