[fluka-discuss]: the quantity scored net charge in USRBIN

From: 盛尹祥子 <yinxiangzi.sheng_at_sphic.org.cn>
Date: Fri, 12 Jul 2019 16:32:11 +0000

Dear experts,



I am trying to understand the USRBIN scoring quantity of NET-CHRG.



Attached is the input file and the results (ASCII), it was a simple input file case,



80MeV proton beam (point beam) incident in an 30cm*30cm*30cm copper.

Apperently, the proton will all stop inside the copper so the charge that the copper collected should be around 1.



However, when I scoring the net charge using NET-CHRG in USRBIN with type X-Y-Z (although in the manual it is not allow to use NET-CHRG when what(1)≥10, I can still run the input file), the result is around 0 (-7.8E-6).



Questions are

1. What is the unit for this result?

2. Why the result is around zero instead of 1 for this case?

3. Any other suggestions for scoring the charge in copper for proton beam (main purpose: simulation of the respond of a faraday-cup in proton beam)?



We appreciate for your help.

Best regards,

盛尹祥子
Y. Sheng(Joey)
-------------------------------------------
上海市质子重离子医院
Shanghai Proton and Heavy Ion Center(SPHIC)
email: yinxiangzi.sheng_at_sphic.org.cn
cell: 001-86-18049876663
mail: 4365 Kangxin Road, Pudong, Shanghai 201321



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Received on Fri Jul 12 2019 - 20:18:00 CEST