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Measurements and Comparisons of IPMs for Ecloud Studies in the LHC: 2007 Results

This report details the measurements conducted using the IPM (Interferometric Profile Monitor) systems in 2007, focusing on both the IPMH and IPMV versions for controlled transverse blow-up studies. Specific cases include one bunch on a long injection flat bottom, four bunches accelerated to 450 GeV/c, and three bunches up to 270 GeV/c. The results reveal significant variances in measured values compared to BWS, particularly under varying energy conditions. Conclusions indicate the need for a detailed comparison and further analysis in future studies, solidifying the IPM’s role in real-time observation of emittance changes.

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Measurements and Comparisons of IPMs for Ecloud Studies in the LHC: 2007 Results

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  1. SPS MEASUREMENTS WITH IPMs IN 2007 J. Koopman and E. Métral • SFTPRO1 • LHC 25 ns (without and with controlled transverse blow-up for ecloud studies) • IONS • 1 bunch on the long injection flat bottom • 4 bunches up to 450 GeV/c • 3 bunches up to 270 GeV/c • Conclusions and outlook

  2. SFTPRO1 (07/11/07) Gaussian of constant normalized emittance in blue x = 3.56 mm BIPMH51634 x = 87.9 m x = 0.81 mm

  3. LHC 25 ns (08/11/07) WITHOUT controlled BU WITH controlled BU (ecloud studies) Gaussian of constant normalized emittance in blue x = 2.68 mm x = 1.51 mm x = 2.10 mm

  4. IONS: 1 bunch on the long injection flat bottom (30/10/07) BIPMV51734 y = 91.2 m y  2.7 mm Comparison with BWS meas.: ~ 0.55 m  Good agreement!

  5. IONS: 4 bunches up to 450 GeV/c (30/10/07) y = 3.2 mm y = 1.3 mm Comparison with BWS meas.: After 1st inj.  0.55 m 12800 ms  0.83 m  ~ 4 times bigger value at 450 GeV/c with IPMV!

  6. IONS: 3 bunches up to 270 GeV/c (24/10/07) After 2nd inj After 1st inj y = 2.99 mm y = 3.00 mm After 3rd inj y = 3.25 mm y = 1.28 mm  ~ 2.5 times bigger value at 270 GeV/c with IPMV!

  7. CONCLUSIONS AND OUTLOOK (1/2) • Measurements have been performed in 2007 with both IPMH and IPMV (not working at the same time!) • Good agreement found with BWS at low energy • However, (with the ions) at top energy bigger values were measured with the IPMs wrt the BWS • At 270 GeV/c  A factor of ~ 2.5 • At 450 GeV/c  A factor of ~ 4 • Another issue which has to be understood is the value of the signal after multiple injections

  8. CONCLUSIONS AND OUTLOOK (2/2) • Next year a detailed comparison between the IPMs and the BWS should be made  The IPM is really a nice tool to observe “online” any blow-up of the transverse emittance (or modification of the profile) at any time along the cycle WITH controlled BU (ecloud studies) Gaussian of constant normalized emittance in blue

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