1 / 14

Overview of Target&Horn Activity

Graphite Target. beam. 1st Horn. 2nd Horn. 3rd Horn. 040823 T2K collaboration meeting. Overview of Target&Horn Activity. A.K.Ichikawa. I=320kA. Current Activity. Japanese construction group Target design : T. Nakadaira et. al Target FEM calculation : Y. Hayato et. al

summer-sanford
Download Presentation

Overview of Target&Horn Activity

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. Graphite Target beam 1st Horn 2nd Horn 3rd Horn 040823 T2K collaboration meeting Overview of Target&Horn Activity A.K.Ichikawa I=320kA

  2. Current Activity • Japanese construction group • Target design : T. Nakadaira et. al • Target FEM calculation : Y. Hayato et. al • Radiation damage study : Y. Hayato et. al • Target He cooling system : w/ Cryogenics group, IPNS, KEK • Horn conceptual design : A. K. Ichikawa et. al • Horn Cooling : H. Sato et. al • Horn expert : Y. Suzuki, Y. Yamanoi • International collaboration • US( Colorado ) (E.Zimmerman, L.Bartoszek) • Start working on design and beam MC. • RAL : possible collaboration on target and baffle starting from FEM • analysis • BNL : possible collaboration around target

  3. 50 GeV 0.75 MW beam ! Residual dose rate > 1000Sv/h 3.3E14 ppp w/ 5ms pulse When this beam hits an iron block, cm cm 1100o (cf. melting point 1536o) • Material heavier than iron would melt. • Thermal shock stress (cf. 耐力 ~300 MPa) Material heavier than Ti might be destroyed. • Cooling power and radiation shield 12GeV PS x 100

  4. Stress analysis -1st horn- Most severe part will be thermal shock on the 1st horn inner-conductor. We don’t have a satisfactory safety factor (=s<25MPa) for that in case of “full”(=0.75MW w/ 3.6sec rep. rate) beam. (Safety factor is not satisfactory but not so bad.) But we decided that instead of a safer but less-neutrino-yielding horn, we adopt the current design at least until we get “full” beam. Temperature rise w/ 3.3E14 ppp 30MPa

  5. Stress analysis -2nd and 3rd horns- 24MPa 20MPa

  6. Stress analysis –target- Stress analysis for the 1 pulse DT was done (and reported at the last collaboration meeting). Full stress analysis after reaching equilibrium have not yet been done. Thermal stress 6.8 MPa (safety factor ~3) One of the serious concern is whether we should divide it to pieces or not. In case it is divided, the structure become very complicated. Therefore, we decided to develop base design without dividing it.

  7. Conceptual design • Almost finished. • After consideration on the stress analysis, we decided to make inner-conductors w/ 3mm-thick aluminum. • Flux generated by beam-MC w/ 3mm-thick aluminum is already distributed. • Fine tuning of the inner-conductor shape • of the 2nd and 3rd horn is on going. • (3rd horn : almost done, 2nd horn : on going.) • -> Eric’s talk. • Alignment tolerance is being studied using beam MC • -> Eric’s talk

  8. New flux v.s. LOI @ OAB2deg New Flux LOI Mainly thanks to longer DV

  9. Horn R&D Status 1st horn 1st horn prototype

  10. Assembled into the K2K outer-conductor.

  11. Other horn R&D status 1st horn outer conductor is being designed and will be constructed within this fiscal year. A prototype of the 3rd horn inner conductor will be constructed within this fiscal year. Shape of the stripline-horn coupling part is being designed. During these designs, E.Zimmerman and L.Bartoszek is working together. Cooling performance is investigated by H.Sato. (-> his talk)

  12. Target R&D status More knowledge on radiation effect -> Y. Hayato New cooling schemes (He cooling instead of water) -> T.Nakadaira R&D for components -> T.Nakadaira

  13. Cost estimate Unit : M$

More Related