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[Opal] Beam profile

Chronological Thread 
  • From: "Rizzoglio Valeria (PSI)" <valeria.rizzoglio AT>
  • To: opal <Opal AT>
  • Subject: [Opal] Beam profile
  • Date: Thu, 23 Mar 2017 09:01:00 +0000
  • Accept-language: it-IT, de-CH, en-US

Dear all

I am running a simulation with a graphite degrader that reduces the energy of a proton beam from 250 to 70 MeV. Attached the input file (

The goal of my analysis is to evaluate the emittance growth due to particle-matter interaction. I use the last monitor M_Moliere placed 1 m away from the degrader. The evaluated emittance results a factor 2 bigger than expected. I plot the beam profile (see attachment).
To me this beam profile looks weird. Is there any reason to see the 4 “perfect aligned” tails? Have you ever notice this kind of behaviour? I think this tails are responsible for the wrong emittance evaluation.

Thanks for your help



  • [Opal] Beam profile, Rizzoglio Valeria (PSI), 03/23/2017

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