1 / 15

Parameter Choice for ILC (Very Low Charge Case)

Parameter Choice for ILC (Very Low Charge Case). J. Gao IHEP -ILC Collaboration IHEP, Beijing, China ILC-Aisa Collaboration Meeting, KEK, March 24, 2005. Content. Design philosophy Parameter relations Parameter proposal for ILC from IHEP, China Conclusion. ILC Design Philosophy.

corin
Download Presentation

Parameter Choice for ILC (Very Low Charge Case)

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. Parameter Choice for ILC(Very Low Charge Case) J. Gao IHEP -ILC Collaboration IHEP, Beijing, China ILC-Aisa Collaboration Meeting, KEK, March 24, 2005

  2. Content Design philosophy Parameter relations Parameter proposal for ILC from IHEP, China Conclusion

  3. ILCDesign Philosophy Required Colliding energy, luminosity Backgroud noise (low) and beam quality (good) Operational condition (stable) Technical constrains (realisable) Damping ring (small space charge effect, reasonable circumference...) 5) Total AC power (reasonable)

  4. Parameter Relations (1) Luminosity Disruption parameter Beamstrahlung induced Energy spread F(R>>1)=1.3/R

  5. Parameter Relations (2) R>>1 Classical radius of electron Particle population inside a bunch

  6. Parameter proposal for ILC from IHEP, China (1) -Wcm=500GeV - -Beamstrahlung energy spread -Mean number of beamstrahlung photons per Electron -Number of hardronic events per crossing (Low background noise)

  7. Parameter proposal for ILC from IHEP, China (2) (Operational stable, small kink instability) -Disruption parameter -R=103 (flat beam) - low charge is good for many things

  8. Parameter proposal for ILC from IHEP, China (3) (m·rad) - - - - - - (m·rad)

  9. Parameter proposal for ILC from IHEP, China (4) - - - If -* - - *Assuming damping ring’s circumference is 17km.

  10. Parameter proposal for ILC from IHEP, China (5) -Damping ring Length Ld=17km -Ed=5GeV, damping time -Bunch length inside the damping ring: -Space charge tune shift (y): Space charge problem is solved by parameter choice!

  11. Parameter proposal for ILC from IHEP, China (6) Particle survival ratio at the ejection Space charge tune shift

  12. Parameter proposal for ILC from IHEP, China (7) Beam current Beam pulse length 0.8ms Peak power per cavity (Eac=35MV/m) 234kW ( , or over coupling factor 1.72 with ) Fill time 0.536ms Rf pulse length 1.34ms

  13. Parameter proposal for ILC from IHEP, China (8) Total AC power is around 100MW

  14. Conclusion • Compared with Tor Raubenheimer’s parameter • lists (5 lists for 500GeV case including low Q case), • the ILC parameter proposed by IHEP can be • named “Very Low Q” (VLQ). • 2. VLQ has low IP background noise, operationally • stable, large misalignment tolerance, … • 3. The space charge problem in the damping rings • can be intrinsically eliminated by this parameter choice. • 4. There is no fundamental technical limitations

  15. Thanks 谢谢

More Related