Dear FLUKA experts, As mentioned in the manual that the channel number can be set manually also (other than the default 1024) as |WHAT (1)|, but I am unable to understand where to put that values. Can you please clarify that ? [DETECT card] Thanks, Riya

Dear riya, the issue in this case is with the post processing tool detsuw. It is limited to a maximum of 4096 channels per detector. You can manually increase the limit by editing the file: /usr/local/fluka/src/tools/detsuw.f You need to increase the value of the NBNMX parameter on line 20. Aft…

Dear @riya , I’m not familiar with the DETECT card, nevertheless I know it is possible to access any card directly by click on the small pencil icon in the bottom right frame of the flair window. Maybe the picture below is more clear, I have highlighted the icon with a red circle. Once you click on …

Hello @amario , As the manual indicated that WHAT (1) should be less than zero for a detector and |WHAT (1)| is the channel number. I want to put channel number as 8190, so I inserted -8190 in WHAT (1) (please see the attached image). But this is not working and the whole card got disturbed by this …

Dear @riya , indeed the Flair interface is wrong: it will be corrected in a next release. You can set manually WHAT(1) to a negative value (as you did): FLUKA will interpret correctly the number of channels required. Before running a simulation, just check with a text editor that the card is corre…

Dear @luillo , I changed WHAT(1) and ignored the error that was shown by Flair. I checked the .inp file. It seems fine (the channel number is visible there). I gave a run and while processing I am getting this error. (see the attached image). Is there anything that I have to add in usreou.f related …

Dear @horvathd , I was trying to edit detsuw but it is appearing to be a read only file. Can you please tell me how to edit that ? Regards, Riya

Dear Riya, you need to edit the file as administrator / root. One way to do is type su in the terminal, then it will ask your password, when it is done you can start the text edit with the command gedit. Cheers, David

Dear @horvathd , Thank you so much. It is now working. I have set NBNMX as 8192. I want to clarify some of the doubts regarding this DETECT card. Since now you have provided us modified usreou.f where only one blackbody region has to be added as a dummy score, is it mandatory to keep same channe…

Dear Riya, It is important to remember, the Gaussian broadening is applied to the value of the deposited energy before the relevant channel number is determined. The number of channels is the dummy region is irrelevant, you can leave it as the default. You are correct, the + and - signs are r…

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How to manually enter channel number in DETECT card

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