The most obvious explanation for why the
post-edge scans line up and the pre-edges don't is that the transmission
chamber
current amp or V/F is saturated and reads a
fixed value below the edge. As the ring current decays, I0 goes down
while
It is fixed below the edge, so ln(I0/It)
decreases as observed. With this explanation, and noting that
ln(I0/It)
decreased by about 0.05 in an hour, I infer
that the stored-beam lifetime is ~20hr.
mam
----- Original Message -----
Sent: Thursday, April 03, 2008 6:13
PM
Subject: [Ifeffit] Brainteaser
Attached is a brainteaser which I think is cute.
Too late for the April fool's day but still...
Some
comments: three consecutive scans of the same sample were taken in this
order: scan 1, 2 and 3. Duration: 30 minutes per scan.
If
these data look unusual to you please tell us why and what could've happened
in this experiment.
Those of you who send first three correct
answers will be acknowledged!
Anatoly
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