Hi
The manual gives you a flavor of what is required. Please see
http://www.fluka.org/fluka.php?id=man_onl&sub=99
Also, please the contents of various FLUKA courses on the website, the
latest being
http://www.fluka.org/fluka.php?id=course&sub=intro&which=dresden2013.
The source sub routine has also been the subject of several discussions in
the list. it will definitely help to read all of them.
A few interesting discussions are.
http://www.fluka.org/web_archive/earchive/fluka-discuss/msg00166.html
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/att-2600/cfambe.f
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/0536.html
Also see the attachments for the actual routines.
Best regards
Sunil
On Wed, Dec 11, 2013 at 6:27 AM, 毕远杰 <biyuanjie_at_tsinghua.org.cn> wrote:
> Hi Sunil
> It looks very useful advices. But I don't know how to use the source
> subroutine to involve other cross sections in FLUKA. Do you have some
> examples files?
>
> Many thanks
>
> Yuanjie
>
>
> -----原始邮件-----
> *发件人:* "Sunil C" <csunil11_at_gmail.com>
> *发送时间:* 2013年12月10日 星期二
> *收件人:* "毕远杰" <biyuanjie_at_tsinghua.org.cn>
> *抄送:* "Joachim Vollaire" <joachim.vollaire_at_cern.ch>, fluka-discuss <
> fluka-discuss_at_fluka.org>
> *主题:* Re: RE: [fluka-discuss]: Does it need special setting for neutron
> in polyethylene?
>
>
> Hi
>
> A couple of points perhaps may help.
>
> It is worthwhile to keep in mind that 10 MeV proton is pretty much at the
> lowest boundary of the PEANUT model that handles such a reaction in FLUKA.
>
> You could also try a couple of alternate methods,(both involving the use
> of source sub routine) to estimate what you require.
>
> The neutron emission cross sections from such a reaction may be available
> in the EXFOR data base and if so, you can use that information. I could
> locate a few by a crude and quick search.
> If you have access to a nuclear reaction model codes, the shape of the
> spectrum can be determined. The total neutron yield from a thick target may
> not be what you get when you use such a code to calculate just the cross
> section at the incident projectile energy, but the shape will be quite
> close.
>
> Also, it is a good practice to use the "CH2 bound natural Hydrogen" cross
> section while using polyethylene and paraffin.
>
> When you bombard a target with protons and try to calculate the neutron
> attenuation length, you are of course aware that the quantity you obtain is
> spectrum weighted average number. I would advice caution while comparing
> such a result with literature values.
>
> Best Regards
> Sunil
>
>
> On Tue, Dec 10, 2013 at 5:17 PM, 毕远杰 <biyuanjie_at_tsinghua.org.cn> wrote:
>
>> Dear Joachim,
>>
>> I attach the input file. I use several slabs to calculate the attenuation
>> length of neutron and photon in concrete and polyethylene.
>> The initial proton beam is 10MeV, which is near the reaction threshold.
>>
>> Many thanks
>> Yuanjie
>>
>>
>> > -----原始邮件-----
>> > 发件人: "Joachim Vollaire" <joachim.vollaire_at_cern.ch>
>> > 发送时间: 2013年12月9日 星期一
>> > 收件人: ??? <biyuanjie_at_tsinghua.org.cn>
>> > 抄送:
>> > 主题: RE: [fluka-discuss]: Does it need special setting for neutron in
>> polyethylene?
>> >
>> > Dear Yuanjie
>> > Could you send your input file, it would be much better to understand
>> your issue.
>> > Thanks in advance
>> > Joachim
>> >
>> >
>> > -----Original Message-----
>> > From: owner-fluka-discuss_at_mi.infn.it [mailto:
>> owner-fluka-discuss_at_mi.infn.it] On Behalf Of ???
>> > Sent: 02 December 2013 12:31
>> > To: fluka-discuss
>> > Subject: [fluka-discuss]: Does it need special setting for neutron in
>> polyethylene?
>> >
>> >
>> > Dear Fluka users,
>> >
>> > I use Fluka to calculate the attenuation length of neutron in different
>> materials from 10 MeV proton impinging on iron target. The New-defaults is
>> used. The results show that the attenuation length in concrete agrees with
>> the literature data. But the attenuation length in polyethylene is much
>> larger than the literature data. So the question is:
>> >
>> > 1) Does it need special setting for neutron in polyethylene?
>> > 2) Does it need special setting for 10 MeV proton which is almost
>> the threshold of the (p,n) reaction except the setting of PART-THR?
>> >
>> > Many thanks
>> > Best wishes
>> > Yuanjie
>> >
>>
>
>
>
Received on Wed Dec 11 2013 - 17:04:49 CET