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Background Study status report

Background Study status report. Osamu Tajima ( Tohoku univ ). Dose Rate till Nov 19 (BGM). Expected Dose particle bkg : 80 kRad/yr SR bkg : 30 kRad/yr  total 110 kRad/yr. FWD Outer. ( 1.5 cm radius ). ~140 kRad/yr. ~120 kRad/yr. ( 2 cm radius ).

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Background Study status report

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  1. Background Studystatus report Osamu Tajima ( Tohoku univ )

  2. Dose Rate till Nov 19 (BGM) Expected Doseparticle bkg : 80 kRad/yr SR bkg : 30 kRad/yr  total 110 kRad/yr FWD Outer ( 1.5 cm radius ) ~140 kRad/yr ~120 kRad/yr ( 2 cm radius ) Less or comparable dose is expected with better vacuum ! Exp 27

  3. Vacuum NEG activation

  4. Dose Rate, Now Expected Doseparticle bkg : 80 kRad/yr SR bkg : 30 kRad/yr  total 110 kRad/yr FWD Outer ( 1.5 cm radius ) 120~130 kRad/yr ~120 kRad/yr ( 2 cm radius ) Almost comparable dose with last experiment (beam cur. are also comparable) Exp 27

  5. Can sensors measure SR ? BWD FWD Outside of ring Be pipe Backscattered SR Inside of ring The 300 mm Au on the manifold blinds photons !! Most of SR photons are absorbed by Au, and converted to the lower energy photons (8~14keV) via the photoelectric effect

  6. Backscattered SR Cu B.S. -SR SR from QCS E deposit compton L-edge of Au K-edge K-edge of Cu 25 kRad/yr + α

  7. HER single beam 880mA Nov 15 HER single SR ? outerside inner side φ

  8. Physics run HER ~ 900mA LER ~1300mA Nov 16 Stored inner side outer side φ

  9. Transparent HER single beam run • Can see lower energy • Very special data format • Now checking working correct or not… Sorry, not done yet

  10. Summary of BG Study • BG level is comparable with exp27 • Estimation of SR is difficult using dose sensors • Try to measure BG using SVD • Can observe SR contribution with cluster energy ? • Now trying to understand, struggling …….

  11. Comments • Readout chipとDSSD自身のBGを別々に見積もる。 (by Samo & Haba) • RadFETとDSSDの両方のＢＧをKarimさんに依頼  これらの比を使ってDSSDのＢＧを見積もる • DSSDの方はエネルギースペクトルも欲しいから、gsimのRawdataをもらうほうがいいかも

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