stephenbrooks.orgForumMuon1GeneralQuarantined Results and Retesting
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[DPC]DanC
2007-04-24 15:45:51
Since I no longer have many boxen to produce volume, I've been concentrating on quality - and trying my own design mutations. 

One thing that I find curious about the rechecks is that (seemingly) EVERY time - the third run on a quarantined result is (seemingly) always VASTLY lower than the first.  This pattern seems to hold regardless of design.  It would seem that at least occasionally - the client would produce similar results when retesting an identical design.

So - on to the question.  Is there really that much standard deviation from result to result?... or is the observed behavior more a part of the design, and I'm just missing something?  How is the seed used, and does the seed account for the deviation?  Not really a gripe, just trying to understand, and improve my designs.

Cheers!

DanC
RGtx
2007-04-24 20:33:05
From my latest queue.txt file "0.595414,0.568889,0.580954,0.587214 (409.0 Mpts) [v4.43d] <DecayRotB>". This is from modifying the first five solenoids, where it can be seen, that of the first four trials, the second run gives a lower muon%. I would guess, that the spread is due to the designs themselves.
[DPC]DanC
2007-04-25 00:44:27
Oops... Let's try that again.

My changes are WAAAY down the pipe from the first five solenoids though.  My current run just finished #3 predictably:

1. 617.805
2. 621.357
3. 552.617

The run before this went 614, 618, 554, 587

This may just be some anomaly that I'm seeing, and it has no bearing on anything... I just thought it somewhat odd.  You'd think occasionally a #3 run would be higher than #1 or #2. Out of the last 25 rechecks - #3 is always significantly lower than 1 or 2. 4 usually balances 3 out a little, but is also lower than #1 or #2.
Stephen Brooks
2007-04-27 12:39:09
That is weird!  Can you send across (e-mail) the raw data from those 25 rechecks (x4 runs, I guess).  Do you count Mpts or muon % or both?
Stephen Brooks
2007-04-27 15:21:22
Ah, I think I see why - in the PhaseRotB lattice

seed 0
seedpitch 1

...so each recheck chain uses the same random seeds (0,1,2,3,4) for decays and some randomisation of the initial particle production.  That means #3 just uses an "unluckier" set of decays (probably early on).
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