Minutes of 101th FFIR/BDSIM and 23rd ILC-Asia WG4 meeting on 4/13/2005

ILC Asia WG4 : Minutes of 23rd meeting

Apr. 13 10:00
Rm.425 bldg.3 at KEK.

(1) ATF2 proposal / PAC05 paper
  - Still some sections are missing.
  - Andrei proposed the outline of executive summary (=PAC paper)
	--Introduction and Goals
	--ATF performance and ATF2 parameters
	--Brief description of the design
	--Modification needed at ATF2
	--Critical instrumentation needed for ATF2
	--International organization and contributions
	--Schedule and estimation of cost (should we include cost in PAC paper?)
	--Other R&D opportunities at ATF2

(2) Signal contamination due to an angular jitter at IP-BPM (Honda)
  - If we have more than two BPMs, se can separate angle and position of beam orbit.
  - With pase detection, IP-BPM will have same amount of sensitivity for 1 nm off set and 100 micro radian tilt.
  - Without pase detection, IP-BPM will have same amount of sensitivity for 1 nm offset, 1 urad tilt and 0.1 urad/mm tilted divergence.
  - Ask SLAC team the typical beam tilt.

(3) Q-BPM development plan (Honda)
  - Design strategy
     a. pill-box
     b. slot magnetic coupling
     c. 4-ports
     d. make wave guide shape simple
     e. change antenna geometry to ensure stronger coupling
     f. change decay time to be optimized for SLAC read-out electronics
     g. enlarge beam pipe radius
     h. not to have a reference cavity
  - Schedule
     a. 2005 Spring: design
     b. 2005 Summer: test model fabrication
     c. 2005 Autumn-winter: test
     d. finalize the design in the beginning of 2006

(4) ATF2 optics baseline design (Kuroda)
  - Finished baseline design
  - Beam line will touch one of main pillars
  - From a viewpoint of radiation safety, we need 3 m space, 1-2m thick concrete wall and 1.5 m thick beam dump.

(5) 5mm diameter beam pipe at IP (Tauchi)
  - Check drawing of Vogel's BPM for more detailed estimation of wake field.

(6) Shintake-monitor (Suehara)
  - R&D will be performed at U. Tokyo
  - Will have a meeting with Kawasaki people
  - Will visit SLAC for shipping preparation on 26-28 April.

Next meeting:
Apr. 20 10:00
Rm.425 bldg.3 at KEK.
TV conference (ID=31110)

   (1) ATF2 proposal / PAC05 paper
   (2) ATF2 optics Layout (Kuroda)
   (3) 5mm diameter beam pipe at IP (Tauchi)
   (4) Shintake-monitor (Suehara)
   (5) Others

----- Tomo SANUKI