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From: Roman Savinov <rsavinov_at_calpoly.edu>

Date: Wed, 27 Jul 2016 00:51:17 +0000

Dear Mikhail,

actually, the right empirical SFLOOD factor which is independent of both detector's and source's radiuses as well as the type of source is

As*( 1/(5*Rd)) ^2,

where Rd - radius of detector. I varied all three variants and this factor remains valid for all three of them. It agrees with your explanation except I don't have 4 in my conversion.

My concern, however, is whether my USRBIN conversion (last line in the attachment) is right when SFLOOD is used. I can't find a right paper to validate my results.

Thank you,

Roman

________________________________

From: Mikhail Polkovnikov <Михаил Полковников> <pmk_at_ihep.ru>

Sent: Tuesday, July 26, 2016 10:57:45 AM

To: Roman Savinov; fluka-discuss_at_fluka.org

Subject: Re: [fluka-discuss]: normalization with SFLOOR

On 22.07.2016 03:23, Roman Savinov wrote:

Dear Mikhail,

you are right, I am not getting a correct integral fluence if I use solely the normalization factor found by integrating the differential fluence. However, I found empirically that if I multiply this factor by 4*pi*(Rs/100)^2, where Rs is radius of emission sphere, it works! Even with different radiuses and SPE sources. Clearly this is somehow related to the 1/(pi R^2) cm-2 you mentioned earlier but I can't figure out how.

If you can determine the relationship, it would be very helpful. In any case, thank you for your help,

Roman

________________________________

From: Mikhail Polkovnikov <Михаил Полковников> <pmk_at_ihep.ru><mailto:pmk_at_ihep.ru>

Sent: Thursday, July 21, 2016 1:00 AM

To: Roman Savinov; fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>

Subject: Re: [fluka-discuss]: normalization with SFLOOR

On 21.07.2016 01:52, Roman Savinov wrote:

Dear Mikhail,

thank you for your response.

I tried SFLOOD after following the Alfredo's suggestion http://www.fluka.org/web_archive/earchive/new-fluka-discuss/0875.html

What I need is indeed uniform and isotropic source of fluence however not of a fixed value but with energy spectra defined by file. I need this to simulate a particular solar event.

Is SFLOOD a right thing to do it? Can it be used with a spectra file or it always produces fluence of a fixed value?

I attach the source file with differential fluence of the 1956 event to show what I mean. The units are: [ MeV #/cm2/MeV ]

Thank you,

Roman

Dear Roman,

Your source_sfloor.f file was correct. SFLOOD is just an uniform and isotropic fluence (density of the tracks) within the sphere, the energy of each particle is generated according to your spectrum (first column - energy bin (MeV), second column - diff. fluence).

I can't guarantee, that you will get a correct integral fluence for normalization, just by integrating the differential fluence data from given spectrum.

Best regards,

Mikhail

Dear Roman,

If i understood correctly,

For example you have an integral fluence N [particles/cm^2]. When you multiply this value by 4*pi*(Rs)^2 you will get a total number of particles, emitted by a SFLOOD sphere. The fluence inside the sphere will be 4*N [particles/cm^2]. In your case 4*N/100^2.

Best regards,

MIkhail

__________________________________________________________________________

You can manage unsubscription from this mailing list at https://www.fluka.org/fluka.php?id=acc_info

Received on Wed Jul 27 2016 - 06:55:00 CEST

Date: Wed, 27 Jul 2016 00:51:17 +0000

Dear Mikhail,

actually, the right empirical SFLOOD factor which is independent of both detector's and source's radiuses as well as the type of source is

As*( 1/(5*Rd)) ^2,

where Rd - radius of detector. I varied all three variants and this factor remains valid for all three of them. It agrees with your explanation except I don't have 4 in my conversion.

My concern, however, is whether my USRBIN conversion (last line in the attachment) is right when SFLOOD is used. I can't find a right paper to validate my results.

Thank you,

Roman

________________________________

From: Mikhail Polkovnikov <Михаил Полковников> <pmk_at_ihep.ru>

Sent: Tuesday, July 26, 2016 10:57:45 AM

To: Roman Savinov; fluka-discuss_at_fluka.org

Subject: Re: [fluka-discuss]: normalization with SFLOOR

On 22.07.2016 03:23, Roman Savinov wrote:

Dear Mikhail,

you are right, I am not getting a correct integral fluence if I use solely the normalization factor found by integrating the differential fluence. However, I found empirically that if I multiply this factor by 4*pi*(Rs/100)^2, where Rs is radius of emission sphere, it works! Even with different radiuses and SPE sources. Clearly this is somehow related to the 1/(pi R^2) cm-2 you mentioned earlier but I can't figure out how.

If you can determine the relationship, it would be very helpful. In any case, thank you for your help,

Roman

________________________________

From: Mikhail Polkovnikov <Михаил Полковников> <pmk_at_ihep.ru><mailto:pmk_at_ihep.ru>

Sent: Thursday, July 21, 2016 1:00 AM

To: Roman Savinov; fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>

Subject: Re: [fluka-discuss]: normalization with SFLOOR

On 21.07.2016 01:52, Roman Savinov wrote:

Dear Mikhail,

thank you for your response.

I tried SFLOOD after following the Alfredo's suggestion http://www.fluka.org/web_archive/earchive/new-fluka-discuss/0875.html

What I need is indeed uniform and isotropic source of fluence however not of a fixed value but with energy spectra defined by file. I need this to simulate a particular solar event.

Is SFLOOD a right thing to do it? Can it be used with a spectra file or it always produces fluence of a fixed value?

I attach the source file with differential fluence of the 1956 event to show what I mean. The units are: [ MeV #/cm2/MeV ]

Thank you,

Roman

Dear Roman,

Your source_sfloor.f file was correct. SFLOOD is just an uniform and isotropic fluence (density of the tracks) within the sphere, the energy of each particle is generated according to your spectrum (first column - energy bin (MeV), second column - diff. fluence).

I can't guarantee, that you will get a correct integral fluence for normalization, just by integrating the differential fluence data from given spectrum.

Best regards,

Mikhail

Dear Roman,

If i understood correctly,

For example you have an integral fluence N [particles/cm^2]. When you multiply this value by 4*pi*(Rs)^2 you will get a total number of particles, emitted by a SFLOOD sphere. The fluence inside the sphere will be 4*N [particles/cm^2]. In your case 4*N/100^2.

Best regards,

MIkhail

__________________________________________________________________________

You can manage unsubscription from this mailing list at https://www.fluka.org/fluka.php?id=acc_info

(image/jpeg attachment: 20160726_165958-1.jpg)

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