1 / 11

Beam line studies for FNAL g-2 experiment

Beam line studies for FNAL g-2 experiment. P. T. Debevec December 9, 2008. Beam transport for g-2 operation. Discussions led by P. Kammel with FNAL machine physicists have led to plan for 8 GeV/c proton beam bunches prepared in Recycler and transferred to AP0 target area.

bobby
Download Presentation

Beam line studies for FNAL g-2 experiment

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. Beam line studies for FNALg-2 experiment P. T. Debevec December 9, 2008

  2. Beam transport for g-2 operation Discussions led by P. Kammel with FNAL machine physicists have led to plan for 8 GeV/c proton beam bunches prepared in Recycler and transferred to AP0 target area Figure 8 of FNAL Beams-doc-3220

  3. Pion decay & muon transport channel Pion decay channel AP2-debuncher/accumulator-AP3 ~800 m New g-2 hall Pion production target at AP0 Figure from C. Ankenbrandt and M. Popovic presentation at 2nd Meeting on the Feasibility of a Muon g-2 Experiment at FNAL 9/30/2008

  4. AP-2 line detail 290 m from Anti-Proton Source Tunnel Ring & Beamline Location Drawing Rev. 4/8/08

  5. Li Lens Injection Left Bend beta_x beta_y disp_x disp_y AP-2 beam line beta and dispersion functions (OPTIM output 8.9 GeV/c tune) 100 m x is horizontal y is vertical 290 m 0 m cf BNL g-2 beta_x max = 22 m

  6. Ax_beta Ay_beta Ax_disp Ay_disp AP-2 beam line beam envelope (OPTIM output 8.9 GeV/c tune) 10 cm 290 m 0 m Li Lens Injection Left Bend cf BNL g-2 min half-aperture 5 cm

  7. Initial beam line study program • Extract parameters of beam line elements from FNAL program OPTIM • Make translation to Transport/Decay Turtle • Use Decay Turtle to determine stored muon flux at magic momentum within g-2 ring emittance • Decrease cell length (increase number of quadrupoles) until phase space saturated (similar to Pile/Kammel/Knaack/Debevec effort with BNL g-2 beam line - see next two slides) • NB: Since channel longer, we can tune to optimal pion momentum.

  8. from P. Pile NP08 Muon Session (JPARC) March 6, 2008

  9. from P. Pile NP08 Muon Session (JPARC) March 6, 2008

  10. Some new issues • Shared AP-2 line use • Matching of new AP-2 line to debuncher ring • Adequate pion momentum selection upstream of target • Possible polarization dilution due to larger pion divergence. (0° decays will reduce this effect.)

  11. Conclusions • Longer decay channel better • Tune to optimal pion momentum • Reduce pion flash • Current AP-2 acceptance similar to BNL g-2 beam line so BNL upgrade ideas applicable • Chromaticity issues will be easier since AP-2 designed for +/- 2 1/2%

More Related