1 / 18

Development of solid hydrogen target in RIKEN

Development of solid hydrogen target in RIKEN. RIKEN T. Ohnishi , H. Takeda, T. Suda KEK S. Ishimoto, S. Suzuki RCNP Y. Takahashi ANL I. Tanihata. Introduction System Solid hydrogen target with thin film Windowless solid hydrogen target Summary. Introduction.

spencer
Download Presentation

Development of solid hydrogen target in RIKEN

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. Development of solid hydrogen target in RIKEN RIKEN T. Ohnishi, H. Takeda, T. Suda KEK S. Ishimoto, S. Suzuki RCNP Y. Takahashi ANL I. Tanihata • Introduction • System • Solid hydrogen target with thin film • Windowless solid hydrogen target • Summary

  2. Introduction Solid hydrogen target for RI beam experiment Proton elastic scattering, (p, 2p) reactions and etc.. High energy and angular resolutions are needed. Requirements • Thin and flat target • Uniform density • Low background t=1~5 mm d=20~30 mm Windowless solid hydrogen target Solid hydrogen target with thin film

  3. Previous work TRIUNF, KEK Window less solid hydrogen target KEK: t=5~10 mm, d=10~20 mm Cooling system: Liquid He system TRIUNF: P. E. Knowles,et. al. Nucl. Instr. Meth. A368(1996)604. KEK : S. Ishimoto, el. al. Nucl. Instr. Meth. A480(2002)314. For RI beam Small system: to cover large solid angle and set easily on the beam line Large target: d > 20 mm We develop small system and more thinner target.

  4. System Gas Flow system Cryostat Vacuum Chamber

  5. 2nd stage 368mm H2 tube 1st stage Cryostat: SUMITOMO RDK-415D Cooling power 1.5W@4K Gas Flow system: Pressure Control Pt-Co resistance thermometer Radiation shield: Copper cylinder Copper block Cell

  6. Solid hydrogen target with thin film 300K G-H2 in/out PtCo thermometer Stycast-2850FT t=3 mm φ30 mm Mylar

  7. 300K G-H2 in/out Stycast-2850FT Stycast-1266 PtCo thermometer

  8. Result 50 μm Mylar Good result T=3.7K Pset=60 Torr 11min 20sec Bad result Liquid T=3.7K Solid Pstart=0.35 atm 3min 40sec

  9. Liquid Solid Liquid Void

  10. Measurement of thickness Keyence LK500 H.R. Mode; 350 +/- 100 mm Linearity; +/- 0.1% of FS Resolution; 10 µm Vacuum LK500 x Target L

  11. d 3 mm 25 μm Mylar t=3 + d = 3.6 mm

  12. Experiment R378@RIKEN

  13. Windowless solid hydrogen target He gas 5 atm t=7

  14. Result H2 Flow Start H2 Flow Stop 3 mm cell Plates Release Pchamber(start) ~ 10-5 Torr After 10 days

  15. Measurement of thickness Average thickness 2.7 mm

  16. Experiment Proton elastic scattering Density distribution of unstable nuclei NaI array RI beam: 200 – 300 MeV/A Recoil Proton: 1 ~ 100 MeV MWDC Energy resolution < 600 keV(FWHM) t = 1 mm Vacuum chamber Si Chamber RI beam Window less solid hydrogen Beam tracker

  17. Summary We have developed small solid hydrogen target system. 1: Solid hydrogen target with thin film d = 30 mm, t = 3 mm, Mylar 25,50μm Clear solid hydrogen target without void. Thickness measurement. 2: Windowless solid hydrogen target d = 30 mm, t = 3 mm Clear solid hydrogen target without void. Thickness measurement. 10 days operation Next step: More thinner window less target, t = 1 mm

More Related