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[bds 200] [ILC-Asia WG4] Minutes of 46th meeting

#Sorry for the late circulation. -Tomo Sanuki

ILC Asia WG4 : Minutes of 46th meeting

Nov. 9 10:00
Rm.425 bldg.3 at KEK.

(1) Shintake monitor (Kume)
http://lcdev.kek.jp/ILC-AsiaWG/WG4notes/meeting/ 2005/1109/20051109PulseLASER-kume.pdf

-Some commercially available lasers were investigated for adopting as a light source of Shintake monitor. It seems difficult to use Ti:Sapphire laser because of its short coherence length of shorter than few 100 micro meters. As a reference, the laser, which has been used at the FFTB/SLAC, has 850mJ¡¡pulse energy with 8nsec pulse width, while it has been operated at about¡¡300mJ.¡¡This FFTB laser seems indeed close to state-of-art with the performance¡¡even at present. -"Compton laser", having 100 psec of pulse width and 400 mJ of pulse energy, seems promising for light source. The Compton laser has been used in the Compton scattering experiment for a polarized positron source at ATF and it will be used in the laserwire R&D. - We can expect that a laser must be commercially available with the power 10 times more than the FFTB one such as the Compton laser. -A Compton-laser school will be provided for the laserwire group by the company in a week of 21 November. So, Tauchi will ask Urakawa for possibility for the Shintake group members to attend the school.

(2) ATF2 schedule (Tauchi)

-ATF2 schedule was expressed and discussed.

(3) Results of ATF extraction experiments (Terunuma)

-Results of ATF extraction experiments using newly installed 300 nsec pulse width of kicker were expressed. -3 trains (1 bunch/train) with space of 154 nsec, 2 trains (2 bunch/train) with space of 330 nsec, 2 trains (5 bunch/train) with space of 154 nsec.

(4) ILC phone meeting (Tauchi)

-Tauchi and Kuroda are going to participate in the phone at 11pm, Thursday (10 November).

Next meeting:
Nov. 16 10:00
Rm.425 bldg.3 at KEK.

----- Takuya KUME