1 / 23

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:

mandar
Download Presentation

Low Proton Energy Running

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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. 2nd Iteration  Reduce GM magnets in strength and  leave all p-magnets in the nominal proton- positron/electron positions  Positron Lattice unchanged, positron IR quads unchanged  Positron optics in the arc: assume 60 degree positron/proton IP (-7.5mm radially)  Optical Parameters: bxp=4.9m bxe = 1.20m byp=0.36m bye = 0.52m eNp=16 mm exe = 40nm eye = 6 nm

  14. IR Top View P-Magnets: Nominal positron/electron positions E-Magnets: Nominal positron positions

  15. IR Top View Close-up

  16. All p-magnets are now at nominal positions GM GM GN GN GN GA GB GB GB9 QR QR QR QR ~4mm P-magnets axis IP P-Trajectory

  17. P-Optics

  18. Effort to readjust magnets Discussion with surveillers für die vorgeschlagene "Lösung 2" mit einer Justage von 3-4 Magneten habe ich die folgenden Zeiten kalkuliert: Aufmaß: 3-4 Standpunkte pro Seite (NR,NL,SR,SL)  x  4 = 12-16 Std. Justierung von 3 Magneten                          x  4 = 12 Std. Kontrollaufmaß                                                    = 12 Std. Gesamt                                                                = 36 - 40 Std. bei Einsatz von zwei Trupps ergibt sich ein Aufwand von 18-20 Stunden. Spaeter geht es wahrscheinlich etwas fixer, so daß es in knapp zwei Tagen geschafft würde.

  19. 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) ok • Positron Optics with 40nm (Mathias) • Explore alternative p-Optics with larger Lumi: GM weaker, GN-1 GN-2 stronger (factor 2), GA stronger, 2nd GN8 off, need GN9, QR10,QR14? (Ferdinand) done • 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) ok • Recalculate SR deposition(Boris) for the case the GMs are moved • Check to which extend magnets can be moved (April 5) (Michael/Peter) this Friday • Discuss with surveillers, make schedule (Michael/Ferdinand) in progress • Lumimonitor Acceptance (Uwe/Guenther) no problem for 2nd version without moving GM • Check nonlinear Field Errors for protons in Low Beta Quadrupoles mainly GA • correction coil settings for off-axis trajectories ok • Write Low Proton Energy Running Report (all)

More Related