Difference: Atf2LwLogBook20100118Shift (3 vs. 4)

Revision 418 Nov 2010 - LauraCorner

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META TOPICPARENT name="Atf2LwLogBook"
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  5.30pm Beam on. Tuning for background.
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Wirescans / Background

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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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Wire Scanner Dimension Centre (mm) Width (Ám)
MW1X X 20.546▒0.118 449.2▒151.9
Y 53.209▒0.008 26.7▒9.0
MW2X X 34.172▒0.004 99.2▒4.5
Y 62.123▒0.004 30.6▒4.5
 
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This gives an angular difference between this e beam and the OTR alignment laser used for a reference of Δx = 41 μrad and Δy = 38 μrad - much better in both directions at once than we have seen before.
 
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Scanning vertically, horizontally and temporally to optimise the signal. Vertical and temporal very good, optimised horizontal position -150.

11.30pm LD tweaked QD18X from 31.214 to 31.464 A, improving signal maximum from ~ 4000 to 4500 counts.

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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