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BBLR MD 24 July 2007 preliminary results

BBLR MD 24 July 2007 preliminary results. G. Burtin , R. Calaga, U. Dorda , J.-P. Koutchouk, G. Sterbini, R. Tomas, J. Wenninger , F. Zimmermann. current scans at 26 and 37 GeV/c. relative loss. 8.4 s , 26 GeV. tune corrected. 8.6 s , 37 GeV. 10.0 s , 37 GeV.

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BBLR MD 24 July 2007 preliminary results

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  1. BBLR MD24 July 2007preliminary results G. Burtin, R. Calaga, U. Dorda, J.-P. Koutchouk, G. Sterbini, R. Tomas, J. Wenninger, F. Zimmermann

  2. current scans at 26 and 37 GeV/c relative loss 8.4s, 26 GeV tune corrected 8.6s, 37 GeV 10.0s, 37 GeV 14 mm distance ~ 8.4 sigma at 26 GeV 10.0 sigma at 37 GeV 12 mm distance ~ 8.6 sigma at 37 GeV lifetime 37 GeV/c data hint at a current threshold, while 26 GeV/c data do not

  3. chromaticity scans 37 GeV/c constant 9 mm distance between beam and wire center ~ 6.5s at 37 GeV/c relative loss QV’ QH’ wire off lifetime wire off nonzero chromaticity together with wire strongly reduces lifetime

  4. distance scans 37 GeV/c relative loss 200 A 150 A lifetime at these wire currents lifetime is very low for separation below 6 or 8 s

  5. low-distance current scan at 37 GeV/c constant 6 mm distance between beam and wire center ~ 4.3s at 37 GeV/c for 50 A wire current the effect of the wire is no longer visible here

  6. 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

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