Difference: Atf2LwLogBook20100118Shift (4 vs. 5)

Revision 520 Nov 2010 - LauraCorner

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META TOPICPARENT name="Atf2LwLogBook"
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  11.20am Magnets changed - load up 10nov17_0005.dat.
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12.10pm Beam very unstable and hard to tune. Near resonance in the DR - possibly only good solution is completer retune of DR. AA, GW, MW tuning DR and extraction line.
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12.10pm Beam very unstable and hard to tune. Near resonance in the DR - possibly only good solution is complete retune of DR. AA, GW, MW tuning DR and extraction line.
  2.15pm OTR0 screen still in beam for some reason. GW removed it manually, orbit changed and background dropped. GW, LD tuning extraction line. LD removed attenuation from signal (1V, now at 14dB, ~ 6000 counts). LC retimed PCs for regen - moves to longer build up times and slightly lower energies as the system warms up. Output ~ 14.5mJ.
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  8.30pm Tuned to vertical beam sizes of ~ 30um at both MW1X and MW2X and horizontal beam sizes of ~ 400um at MW1X and ~ 150um at MW2X. Saved optics file 10nov18_2030.dat. Checked timing on normal scope, e beam alignment with notch in OTR screen.
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9pm Collisions! Chamber 945 vertical 10 horizontal centre of peak, phase 2.75. After chamber alignment to e beam with notch we were right on top of the signal. Pointing of e beam very good with these optics which maybe made the difference.
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9pm Collisions! Chamber 945 vertical 10 horizontal centre of peak, phase 2.75. After chamber alignment to e beam with notch we were right on top of the signal. Pointing of e beam very good with these optics which seems to have made the difference.
 

Wire Scanner Dimension Centre (mm) Width (Ám)
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  12am LN trying to fit scans but python scripts had not been logging data - all files empty. GW archiving laserwire PVs so data can be retrieved and analysed.
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1am Two scans with debugged scanning and logging data. Later fit shows a laserwire scan σ = 11.4 +/- 0.2 μm.
 
 
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