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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.

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Polarized Positron Experiment at KEK-ATF

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  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, …

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