Effect of magnetic field

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Presentation transcript:

Effect of magnetic field B Hide PMT from charged particle PMT for strong magnetic field (～4000 gauss) Top : http://www.phenix.bnl.gov/phenix/project_info/integration/config_management/envelope_control Bottom : PHENIX Conseptual Design Report , Chapter4 Magnets (1993)

PMT selection R5924 fine mesh PMT Operate in high magnetic field High gain ～400μA ( cf. R3809 MCP type ～1０μA ) Rise Time　‥‥‥　2.5 nsec T.T.S　‥‥‥　440psec Anode Effective Area　‥‥‥　Φ39mm (min) Current Amplification 　　　　　　　　　　　　　　　 at 0 Tesla at 0.5 Tesla at 1.0 Tesla ※ HAMAMATSU PHOTONICS K.K.

Light Guide 100 % ? % Cross section scintillator PMT ①　inside ②　outside Scintillator face 2cm×8cm PMT face 4cm×4cm L cm Few difference between inside rod and outside and get many photon when L=10cm

Light Guide ( details ) ① no reflection ② rectangle ③ fish tail 100 % ? % Cross section scintillator Scintillator face 2cm×8cm PMT face 4cm×4cm PMT 　inside 　outside L cm ① no reflection ② rectangle ③ fish tail ④ rectangle + fish tail 4cm L [cm] L [cm] L [cm] L [cm]

Expected Time Degradation cross section scintillator ‥‥ ①outside‥‥‥ ‥‥･②inside‥‥‥･ ③ PMT 2cm×2cm ×4 2cm×8cm x [cm] ・Scintillator should be divided into four.

Expected T0 Resolution T0 resolution : (x=50cm) ⊿TL ⊿TR x [cm] charged particle Light guide PMT scintillator ⊿TL ⊿TR x [cm] T0 resolution : (x=50cm)