[mcstas-users] MCStas usage: simple TOF question

[Kim Lefmann]

Dear Diego,

The chopper on a reactor source works a little counter-intuitive. Could 
you send me the McStas instrument file, so I can diagnose better?

best, Kim


On 08/23/2017 05:32 PM, Diego Ferraro wrote:
> Dear All,
>     I'm new in McStas modelling and I'm having some problems 
> understanding the results from Code. I'm using the 2.4.1 version to 
> model a simple TOF example using a reactor beam as source (thermal) 
> and a disk chopper. My model (se attached .png) consist of Maxwelian 
> source (using Source_gen), a non-reflecting beam (using guide with 
> m=0), a Chopper (using DiskChopper) another ~5m beam after the chopper 
> and finally, a collimator and an MCA in time mode (modeled using a 
> TOF_monitor with 1000 Time channels).
>    I get the results in TOF monitor and several questions arise:
>    1 - The results are per unit time (1/s)  as for the flux ? (i.e. 
> the TOF monitor represents the acumulated counts in 1s with efficiency 
> =1) ?
>    2 - I should expect that the transmision of the Chopper would 
> change with its velocity, but I found no dependency in TOF 
> monitor (see attached Figure).
>   Obviously I am missing something, but I cannot figure which is the 
> problem.
>   Thanks in advance for any help,
>   Diego Ferraro
>
>
>
>
>
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