slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
PEP MD Items So far done: Commissioned Trickle Charge Operation Lowered HER beta_y* by 1 mm PowerPoint Presentation
Download Presentation
PEP MD Items So far done: Commissioned Trickle Charge Operation Lowered HER beta_y* by 1 mm

Loading in 2 Seconds...

play fullscreen
1 / 6

PEP MD Items So far done: Commissioned Trickle Charge Operation Lowered HER beta_y* by 1 mm - PowerPoint PPT Presentation


  • 92 Views
  • Uploaded on

PEP MD Items So far done: Commissioned Trickle Charge Operation Lowered HER beta_y* by 1 mm Got 4-1 going & raised HER Vrf to 15.3 MV Raised (inadvertently) LER Vrf to 3.8 MV Steered the HER, this also reduced the beta_x beat Tested but not implemented the HER beta_x beat knobs

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'PEP MD Items So far done: Commissioned Trickle Charge Operation Lowered HER beta_y* by 1 mm' - suki


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide2

PEP MD Items

  • So far done:
    • Commissioned Trickle Charge Operation
    • Lowered HER beta_y* by 1 mm
    • Got 4-1 going & raised HER Vrf to 15.3 MV
    • Raised (inadvertently) LER Vrf to 3.8 MV
    • Steered the HER, this also reduced the beta_x beat
    • Tested but not implemented the HER beta_x beat knobs
    • January performance ≈ 10/fb/mo for 30-day month (need 13)

U. Wienands, SLAC-PEP-II

PEP Talk. YVR ppt, 14-Feb-02

slide3

From our 8-Jan PEP meeting:

    • To make 430/pb average lumi/day we need
      • Peak L of about 9.25E33
      • This can be achieved e.g. with
        • Both ßy* lowered by 10%
        • 2.25 A on 1.53 A in 1600 bunches.
      • Need more rf voltage to gain from lower ßy* (18 MeV in HER)
      • We may need to deploy more SLAC klystrons to get there
  • New item: HER trickle charge
    • Benefits may be similar to LER trickle charge
    • Need to study injection first

U. Wienands, SLAC-PEP-II

PEP Talk. YVR ppt, 14-Feb-02

slide4

(Spec.) Lumi vs beam currents still suggests raising HER current and/or lowering its beta* should help

    • Saturation more pronounced with LER current than with HER current
    • Do we need to quantify this?
  • OTOH: The HER tune shifts are estimated to be significantly lower than those of the LER
    • Estimates differ but the general trend is the same
    • If so, then pushing HER tune shift up in Y should bring significant gains.
    • How can we make the HER more tolerant of large (y) tune shifts?
      • Exploring y tune space may help finding better spot with larger acceptance
      • Fixing the HER ßx beat may help acceptance
      • Lowering LER ßy may help if HER x limits

U. Wienands, SLAC-PEP-II

PEP Talk. YVR ppt, 14-Feb-02

slide5
U. Wienands, SLAC-PEP-II

PEP Talk. YVR ppt, 14-Feb-02

slide6
U. Wienands, SLAC-PEP-II

PEP Talk. YVR ppt, 14-Feb-02