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Welcome to the Logbook for ATF Collimator Damage Tests

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See also RunPlan (logbook up to 24 Feb 2008).


26 Feb 2008 - 01:23 [ NigelWatson ]: Test single shot mode

We start by trying to establish single shot operation.

From "BEAM CONTROL (simple)" panel, click "one shot" button.

ONE SHOT CONTROL panel pops up, we try start/stop but does not appear to actually stop the beam using shutter. Terenuma-san called for help.


26 Feb 2008 - 03:44 [ NigelWatson ]: Single shot now works
Now we are OK, Terenuma-san et al have this running now. Beam still being tuned up by the shift crew. Next to check on jitter inherent in procedure.

26 Feb 2008 - 06:35 [ MarkSlater ]: Single Shot Results
I have analysed the single shot/varying charge data. Essentially, the single shot is no different from continuous operation but when changing charge, I saw a shift of a ~200um in Y.
SingleShotJitter.gif

26 Feb 2008 - 07:24 [ MarkSlater ]: First attempts to damage target.
* We move sample to beam, find that offsets from edge finding are:
    • Yoffset=-29.6mm is lower edge
    • Xoffset=-3.2mm
    • Roffset=-0.035
We also see the ICT saturating at 14bits range.

We position the target sample at horizontal -6.248mm, vertical -30.242mm (i.e. below right hand edge of sample holder) and now we start optimise beam size against ICT readings...

* Try to find edges, check width of sample.


26 Feb 2008 - 08:06 [ NigelWatson ]: Optimisation against ICT signal
trying, but all of a sudden, gamma count saturated and remained so even after the sample had been completely retracted from the beam position. We don't think we could have actually damaged any solid components. Let's try again...


Electronic Logbook Data Entry (TWiki formatting allowed)

-- NigelWatson - 24 Feb 2008

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Topic revision: r8 - 2008-02-26 - NigelWatson
 
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