Druck-Materie 20b.qxd - JUWEL - Forschungszentrum Jülich

as adiabatic one. Then, solution of a non-stationary, heat diffusion equation by inspection enables
one to estimate specific heat production rate versus time in the vicinity of the wall and
in the region near the thermocouple inside the capsule as well.
Some regularities were discovered:
• steep rise of temperature begins at once in each point of a sample regardless of a size of a
sample, over a time interval of 0÷0.4 sec.
• time structure of a burp is close to the non-symmetric Gaussian, with back front shorter.
• effective duration of a burp varied from ≤ 0.2s (0.2 sec is an experimental limit of time
resolution) up to ~1s according to stored energy at a given point of a sample; Q-dependence
of burp duration was hard to estimate; it looks to be closer to the second power of
1/Q.
Typical result of reconstruction of time dependence of recombination power in the
burp #11 is in Fig. 7.
Figure 7. Pulse shape of the burp # 11.
7. WATER ICE
7.1 Stored energy and Saturated curves
An amount of stored energy was estimated by different methods described above. Results are
in Table 4 where Q-values evaluated from temperature response of a thermocouple placed inside
the sample chamber, are placed in the second row, Q12, and in the third row Q-values
evaluated by balancing heat removed by helium are given (the last method was available only
for spontaneous burps).
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