BBLR MD 24 July 2007 preliminary results
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Transcript of BBLR MD 24 July 2007 preliminary results
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BBLR MD24 July 2007
preliminary results
G. Burtin, R. Calaga, U. Dorda,
J.-P. Koutchouk, G. Sterbini, R. Tomas,
J. Wenninger, F. Zimmermann
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current scans at 26 and 37 GeV/c
14 mm distance ~ 8.4 sigma at 26 GeV10.0 sigma at 37 GeV
12 mm distance ~ 8.6 sigma at 37 GeV
8.4, 26 GeV
8.6, 37 GeV
10.0, 37 GeV
relative loss
lifetime
tunecorrected
37 GeV/c data hint at a currentthreshold, while 26 GeV/cdata do not
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chromaticity scans 37 GeV/crelative loss
lifetime
QH’
QV’
wire off
wire off
nonzero chromaticitytogether with wirestrongly reduces lifetime
constant 9 mm distance between beam and wire center~ 6.5 at 37 GeV/c
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distance scans 37 GeV/c
relative loss
lifetime
200 A
150 A
at these wire currentslifetime is very low for separation below 6 or 8
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low-distance current scan at 37 GeV/cconstant 6 mm distance between beam and wire center~ 4.3 at 37 GeV/c
for 50 A wire currentthe effect of the wireis no longer visible here
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some conclusions• 2007 BBLR MDs are off to an excellent start• non zero chromaticity enhances effect of long-range
collisions• scaling behavior violated (26 GeV “special”?)• few LR encounters at small distance may be
acceptable (we should check this with higher lifetime resolution)
• BBLR1 needs to be rotated by 180 degrees prior to week 34 MD, if possible
• we look forward to compensation studies and measurements at 55 GeV