1 / 19

Polarized Positron Experiment at KEK-ATF

Polarized Positron Experiment at KEK-ATF. JPSMeeting2005. KEK ATF におけるパルス偏極陽電子生成３ 〜 偏極陽電子生成とその偏極度測定 〜. 浦川順治、 @ 大森恒彦、奥木敏行、栗原良将、 黒田隆之助 A 、斉藤卓 A 、坂上和之 A 、広瀬立成 A 、 福田将史 B 、鷲尾方一 A. 高エ研、早大理工総研 A 、放医研 B. Pol. e + Production. Design values. N g = 1 x 10 7 /bunch.

sage
Télécharger la présentation

Polarized Positron Experiment at KEK-ATF

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. Polarized Positron Experiment at KEK-ATF JPSMeeting2005 KEKATFにおけるパルス偏極陽電子生成３ 〜偏極陽電子生成とその偏極度測定〜 浦川順治、@大森恒彦、奥木敏行、栗原良将、 黒田隆之助A、斉藤卓A、坂上和之A、広瀬立成A、 福田将史B、鷲尾方一A 高エ研、早大理工総研A、放医研B

  2. Pol. e+ Production Design values Ng = 1 x 107 /bunch Ne+ = 1 x 104/bunch (Ee+ = 25 to 45 MeV) Pol. e+ ~ 80 % DT(rms) = 31 psec Can NOT measure each e+ Polarimetry ?

  3. Measure e+ polarization : use Bremsstrahlung g-ray g-ray polarized e+ E = 40 MeV Pb conveter

  4. Measurement and Cross-Check Measurement e+ beam pol. (laser pol) e- spin in iron (magnet pol.) expected value (MC) ) Calculate A R A(R) : A(R)= ~ + 0.7 % ) Calculate A A(L) : A(L)= ~ - 0.7 % L ) Calculate A 0 non (Liner) A(0) : A(0)=0 Cross-Check e+ beam pol. magnet pol. ) Calculate A A(P) : A(P)= ~ + 0.7 % P ) N A(N) : A(N)= ~ - 0.7 % Calculate A Zero magnet current Not Equal No-polarization, due to residual magnetism

  5. Leakage B Feild e+ trajectry Acceptance Mag. Pol. = P e+ CO2 Cherenkov If e+ beam go just center of magnet -> OK Mag. Pol. = N e+ CO2 Cherenkov

  6. Leakage B Feild e+ trajectry Acceptance Mag. Pol. = P e+ CO2 Cherenkov If e+ beam go off center, trajectry near magnet may be different when we flip magnet. Mag. Pol. = N e+ CO2 Cherenkov

  7. A(TP,TN) = 0 acceptance affected by B field Acceptance Correction Define: A(TP,TN) = (TP-TN)/(TP+TN) magnet pol. e+ beam pol. ) P average transmission TP non ) N average transmission TN non A(TP,TN) = 0 from absorption in iron Use A(TP,TN) for acceptance correction

  8. e+ polarization (e+ run): results preliminary Measurement e+ beam pol. magnet pol. ) R A(R)= +0.16± 0.28% ) L A(L)= -1.63± 0.28% ) non (Liner) A(0)= -0.24± 0.28% 0 Cross-Check e+ baem pol. magnet pol. ) P A(P)= +0.85± 0.28% ) A(N)= -0.93± 0.28% N Acceptance Correction A(TP,TN) = -0.57± 0.17%

  9. e+ polarization (e+ run): results preliminary Measurement Acceptance Corrected by A(TP,TN) e+ beam pol. magnet pol. ) R A(R)= +0.72± 0.28% ) A(L)= -1.07± 0.28% L ) A(0)= +0.33± 0.28% 0 non (Liner) Cross-Check e+ beam pol. magnet pol. ) P A(P)= +0.85± 0.28% ) A(N)= -0.93± 0.28% N

  10. e+ polarization (e+ run) preliminary results e+ beam spin e- spin in Iron A(R)= +0.72± 0.28% e+ beam spin e- spin in Iron A(L)= -1.07± 0.28% e+ beam spin non e- spin in Iron A(0)= +0.33± 0.28%

  11. We did e- run, also. e- run e+ run

  12. e-polarization (e- run): results Measurement preliminary e- beam pol. magnet pol. ) R A(R)= +0.81± 0.28% ) L A(L)= -0.91± 0.27% ) non (Liner) 0 A(0)= -0.26± 0.27% Cross-Check e- beam pol. magnet pol. ) P A(P)= +0.76± 0.27% ) A(N)= -0.96± 0.27% N Acceptance Correction A(TP,TN) = -0.12± 0.16% NO correction is necessary

  13. e- polarization (e- run) preliminary results e- beam spin e- spin in Iron A(R)= +0.81± 0.28% e- beam spin e- spin in Iron A(L)= -0.91± 0.27% e- beam spin non e- spin in Iron A(0)= -0.26± 0.27%

  14. Polarized Positron Experiment at KEK-ATF JPSMeeting2005 まとめ レーザー光の偏極が、γ線へ、そして対生成された e+と e- へと伝達されていく事が確認された。 2) 短パルス高強度の偏極γ線、e+、e-の偏極測定法が確立できた。 3) 陽電子の透過率のアシンメトリーは予想値である~ 0.7 %に一致した。 --> 偏極度 ~80% の陽電子ビームが得られた。

  15. ここで終わり。 これから後はバックアップ

  16. Experiment@KEK DT = 31 p sec. DT = 31 p sec. DT = 31 p sec. i) proof-of-principle demonstrations ii) accumulate technical informations: polarimetry, beam diagnosis, …

More Related