The "Old" Pion Hodoscopes

• consisting of 1cm plastic scintillating bars
• using Hamamatsu R3478 PMTs
• special bases
• read more about it in "Design and commisioning of the GSI pion beam", Diaz et al, NIM A 478 (2002)
• HV -1300 (maybe up to -1500?)
• Hamamatsu says R3478 can use up to -1700

some words about repairing

the pmts are GLUED to the lighguides which are glued to the scintillator

reason for too small and bad signal was a faulty base (which is separate from the pmt)

note: the fans should be used and/or temperature should be monitored... the bases will get hot if in use!

-- BjoernSpruck - 12 Oct 2006