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Low Proton Energy Running

Low Proton Energy Running. Adiabatic damping and aperture limitations. Proton beam-beam Tuneshift. Electron Beam Size Matching. Electron Beam-Beam Tune shift. Lumi-scaling with Energy. First simple Version. Protons of 460GeV with Positrons of 27.5GeV Concept:

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Low Proton Energy Running

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  1. Low Proton Energy Running

  2. Adiabatic damping and aperture limitations

  3. Proton beam-beam Tuneshift

  4. Electron Beam Size Matching

  5. Electron Beam-Beam Tune shift

  6. Lumi-scaling with Energy

  7. First simple Version Protons of 460GeV with Positrons of 27.5GeV Concept: • Do not touch the positron magnets in the IR • Thus the e+ IR trajectory as in standard running • Increase Beta functions and emittances by a factor of two • Minimize distance between p beam envelope and GM Mirror plate • Move all proton magnets GM-QR10

  8. Beam Optics bxp=4.9m bxe = 1.20m byp=0.36m bye = 0.52m eNp=16 mm exe = 40nm eye = 6 nm e-Quadrupoles within 40m of IP not changed Proton Optics

  9. Beam-Beam Tuneshift

  10. Proton Trajectories for 920GeV and for 460 GeV

  11. Magnet Positions for 920GeV and 460GeV Proton Trajectories 460GeV Magnet Axis Positions 920GeV Magnet Axis Positions

  12. Top View 460GeV/27.5GeV proton /positron trajectories

  13. To Do List until PRC in May • Match p Optics for left hand side IR (Bernhard/Alexander) • Design trajectories for right hand side IR (Joachim) • Positron Optics with 40nm (Mathias) • Explore alternative p-Optics with larger Lumi: GM weaker, GN-1 GN-2 stronger (factor 2) GN-3 reversed polarity, GA stronger, 2nd GN8 off, need GN9, QR10,QR14? (Ferdinand/Bernhard/Alexander) • Exact Calculation of e and p trajectories with Mike Seidel’s program (refine Magnet positions if needed) and generate magnet position lists, BPM offsets etc…(Joachim) • Recalculate SR deposition(Boris) • Check to which extend magnets can be moved (April 5) (Michael/Peter) • Discuss with surveillers, make schedule (Michael/Ferdinand) • Lumimonitor Acceptance (Uwe/Guenther) • Check nonlinear Field Errors for protons in Low Beta Quadrupoles • correction coil settings for off-axis trajectories • Write Low Proton Energy Running Report (all)

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