Some preliminary "results" and questions:

relevant directories:
~/PhaseSlip/Data0/F1.3/
~/PhaseSlip/Data0/F1.25/

For the impurity distribution produced by a randseed of 0,
(positions of impurities are in Data0/x), there are interesting
events happening at E=1.3 and E=1.25.  The time dependence of cdw
current at E=1.3 shows the emergence of tiny peaks beside the main
peaks.  At E=1.25, these tiny peaks seem to have grown larger, so
that they are comparable to the main peaks.  These subpeaks seem to
be result of a higher harmonic.  How and why do they appear?  Is
the appearance correlated with phase slips?  

I monitored the strains at E=1.3 (unfortunately, it was not quite
at steady state then) and there were no obvious phase slips.
There was a point (look at files VEL or spring.mon) in the CDW,
point # 22, where the strain oscillates back and forth, passing
through the point of maximum strain, but never slipping (go round
2pi). When this was being monitored, the current vs. time plot did
not have subpeaks.  Once these subpeaks appear, does it mean that
the phase slips have started to occur, and at what points?  I
haven't answered that. Is the oscillation through the point of
maximum strain that was observed just a numerical artifact and what
effect, if any, does it have on the dynamics of the cdw and the cdw
current? 

At E=1.25, several phase slips were apparent.  They occur at the
points 91, 20, 22, 83, and 21(?).  There were also other points
which seem to be oscillating just as #22 above: points 40, 81, 47,
77.  Recall that I haven't detected any phase slips so far in E=1.3.
A good question to answer is when and where the first phase slip
occurs.  To that end, we may try looking between E=1.3 and E=1.25.
If, however, it turns out that some phase slips actually occur at
E=1.3, but I haven't detected them because I haven't run it long
enough, we may look at E slightly greater than 1.3.  At E=1.2,
phase slips seem to be occuring at 91, 20, 22, 83, just like
E=1.25.  Does that mean that points which phase slip once would
continue to phase slip?  Do such points ever stop slipping?

There is no doubt that phase slips *can* occur at E=1.3 given the
right cdw configuration.  I took the steady-state configuration
obtained from the FLR-model simulation and ran the phase slip code
on it.  Several phase slips were observed.

Thus an interesting question to be investigated is whether there are
multiple equilibrium states which the phase slip model allows.
In the FLR model, equilibrium cdw configurations above threshold
are unique modulo two pi.  Is that so with the phase slip model?
Preliminary results says no, but sufficient time may not have been
allowed for equilibrium to be reached.  I subjected a distorted cdw
configuration to a high field using the phase slip model, and the
distortion did not disappear even after a long time.  This further
supports the notion that there may be metastable states above
threshold for the phase slip model.  Do these states, if they
exist, have very different dynamic behavior and cdw currents?
