https://sourceforge.net/p/starucn/wiki/Benchmarks/Recent changes to BenchmarksenMon, 14 Apr 2014 06:21:14 -0000https://sourceforge.net/p/starucn/wiki/Benchmarks/<div class="markdown_content"><pre>--- v9 +++ v10 @@ -52,5 +52,5 @@ GEANT4 results, courtesy of Mr. Fabien Lafont, ILL - -[Advanced user/Plugin developper manual](Advanced) << Previous +--------------------------------------------------------------- +Previous: [Advanced user/Plugin developer manual](Advanced) </pre> </div>Benoit CLEMENTMon, 14 Apr 2014 06:21:14 -0000https://sourceforge.neted8caee0ca46fd658af6101bd8b943b89443debfhttps://sourceforge.net/p/starucn/wiki/Benchmarks/<div class="markdown_content"><pre>--- v8 +++ v9 @@ -50,5 +50,7 @@ * Additional effect from diffuse reflection. Indepedently of the energy, diffusivity allows neutrons to go back out of the guide, reducing the total transmission. <p style="text-align: center;"></p> +GEANT4 results, courtesy of Mr. Fabien Lafont, ILL -GEANT4 results, courtesy of Mr. Fabien Lafont, ILL + +[Advanced user/Plugin developper manual](Advanced) << Previous </pre> </div>Benoit CLEMENTMon, 14 Apr 2014 06:15:02 -0000https://sourceforge.netf16579c9a187e0d8c80eee06e56857a6c81392dchttps://sourceforge.net/p/starucn/wiki/Benchmarks/<div class="markdown_content"><pre>--- v7 +++ v8 @@ -1,12 +1,12 @@ <h1>Benchmarking</h1> -Several check of the code have been performed with respect to analytical calculation and with other Monte-Carlo codes +Several checks of the code have been performed with respect to analytical calculations and to other Monte-Carlo codes [TOC] ## Analytic benchmaking -* Geometry : Two material foils witin a vaccum tub +* Geometry : Two material foils witin a vaccum tube * Titanium (VF=-50neV), two 15µm foils * Aluminum (VF= 50neV), 30µm and 300µm foils <p style="text-align: center;"></p> </pre> </div>Benoit CLEMENTSun, 13 Apr 2014 12:28:41 -0000https://sourceforge.net680d10b6994f77f6a61d7e667a4b634bd21aade4https://sourceforge.net/p/starucn/wiki/Benchmarks/<div class="markdown_content"><pre>--- v6 +++ v7 @@ -28,24 +28,27 @@ MCucn results, courtesy of Dr. Geza Zsigmund, PSI -## Comparison with Geant4ucn +## Comparison with GEANT4ucn GEANT4ucn is a GEANT4 module designed to deal with very low energy neutrons * Geometry : U-shaped steel guide : height = 70cm, length = 30 cm, square section 5x5cm, VF= 200neV -* Generation : Neutron are generated at the entrence of the guide~: +* Generation : Neutrons are generated at the entrance of the guide~: * Uniform energy form 0 to 500 neV * Uniform position in the square section * Horizontal direction <p style="text-align: center;"></p> * Observable : Energy distribution of the neutron at the end of the guide, normalized to the initial spectrum. this obserfable check both total transmission and energy spectrum deformations. -<p style="text-align: center;"></p> -On these plot one can see: +The results are given for several configuraton of the wall properties -* Left plot: transmission of the perfect guide. The initial cut off is due to the guide height -* Central plot: additional effect from absorption on the walls. The total transmission is reduced and as the energy increases so does the number of wall collisions and the loss probability. -* Right plot: additional effect from diffuse reflection. Indepedently of the energy, diffusivity allow neutrons to go back out of the guide, reducing the total transmission. +* Transmission of the perfect guide. The initial cut off is due to the guide height. +<p style="text-align: center;"></p> +* Additional effect from absorption on the walls. The total transmission is reduced and as the energy increases so does the number of wall collisions and the loss probability. +<p style="text-align: center;"></p> +* Additional effect from diffuse reflection. Indepedently of the energy, diffusivity allows neutrons to go back out of the guide, reducing the total transmission. +<p style="text-align: center;"></p> + GEANT4 results, courtesy of Mr. Fabien Lafont, ILL </pre> </div>Benoit CLEMENTSun, 13 Apr 2014 12:27:56 -0000https://sourceforge.net9106c79065940d009715eb2c864a0d88d66668a4https://sourceforge.net/p/starucn/wiki/Benchmarks/<div class="markdown_content"><pre>--- v5 +++ v6 @@ -37,7 +37,15 @@ * Uniform energy form 0 to 500 neV * Uniform position in the square section * Horizontal direction +<p style="text-align: center;"></p> * Observable : Energy distribution of the neutron at the end of the guide, normalized to the initial spectrum. this obserfable check both total transmission and energy spectrum deformations. - -GEANT4 results, courtesy of Mr. Florent Lafont, ILL +<p style="text-align: center;"></p> + +On these plot one can see: + +* Left plot: transmission of the perfect guide. The initial cut off is due to the guide height +* Central plot: additional effect from absorption on the walls. The total transmission is reduced and as the energy increases so does the number of wall collisions and the loss probability. +* Right plot: additional effect from diffuse reflection. Indepedently of the energy, diffusivity allow neutrons to go back out of the guide, reducing the total transmission. + +GEANT4 results, courtesy of Mr. Fabien Lafont, ILL </pre> </div>Benoit CLEMENTSun, 13 Apr 2014 12:19:09 -0000https://sourceforge.net61a6b32b2e0e217e04b1918ff666fdd630ab9212https://sourceforge.net/p/starucn/wiki/Benchmarks/<div class="markdown_content"><pre>--- v4 +++ v5 @@ -20,8 +20,11 @@ MCucn is a ucn code developped for the PSI nEDM experiment. For this chack, an analytical solution is also available. * Geometry : Closed cylinder, H=15cm, R=25cm, VF=230neV, d=0, &eta;=0 +<p style="text-align: center;"></p> + * Generation : Neutron are generated uniformly on the bottom of the cylinder * Observable : Position of the center of mass of the ucn gas at equilibrium is reached (a few tenth of seconds) as a function of the initial veritcal energy. +<p style="text-align: center;"></p> MCucn results, courtesy of Dr. Geza Zsigmund, PSI </pre> </div>Benoit CLEMENTSun, 13 Apr 2014 11:59:48 -0000https://sourceforge.neta4da170841e10bbdb83ebd1abf236c6b921784a8https://sourceforge.net/p/starucn/wiki/Benchmarks/<div class="markdown_content"><pre>--- v3 +++ v4 @@ -9,9 +9,10 @@ * Geometry : Two material foils witin a vaccum tub * Titanium (VF=-50neV), two 15µm foils * Aluminum (VF= 50neV), 30µm and 300µm foils +<p style="text-align: center;"></p> * Generation : Neutron beam normal to the foils with uniform velocity distribution * Observable : Transmission of the neutron beam as a function of the energy. - +<p style="text-align: center;"></p> ## Comparison with MCucn </pre> </div>Benoit CLEMENTSun, 13 Apr 2014 11:58:50 -0000https://sourceforge.net126d4658654652e11759455d1492fca3c58b5c63https://sourceforge.net/p/starucn/wiki/Benchmarks/<div class="markdown_content"><pre>--- v2 +++ v3 @@ -16,15 +16,24 @@ ## Comparison with MCucn -MCucn is a ucn code developped for the PSI nEDM experiment. +MCucn is a ucn code developped for the PSI nEDM experiment. For this chack, an analytical solution is also available. * Geometry : Closed cylinder, H=15cm, R=25cm, VF=230neV, d=0, &eta;=0 * Generation : Neutron are generated uniformly on the bottom of the cylinder -* Observable : Positon of the center of mass of +* Observable : Position of the center of mass of the ucn gas at equilibrium is reached (a few tenth of seconds) as a function of the initial veritcal energy. - -MCucn results, courtesy of Dr. Geza Zsigmund +MCucn results, courtesy of Dr. Geza Zsigmund, PSI ## Comparison with Geant4ucn -Geant4 results, courtesy of Mr. Florent Lafont +GEANT4ucn is a GEANT4 module designed to deal with very low energy neutrons + +* Geometry : U-shaped steel guide : height = 70cm, length = 30 cm, square section 5x5cm, VF= 200neV +* Generation : Neutron are generated at the entrence of the guide~: + * Uniform energy form 0 to 500 neV + * Uniform position in the square section + * Horizontal direction +* Observable : Energy distribution of the neutron at the end of the guide, normalized to the initial spectrum. this obserfable check both total transmission and energy spectrum deformations. + + +GEANT4 results, courtesy of Mr. Florent Lafont, ILL </pre> </div>Benoit CLEMENTSun, 13 Apr 2014 11:31:35 -0000https://sourceforge.netce255c2bfb4acb9ba52f50c3f8907cfe086b707fhttps://sourceforge.net/p/starucn/wiki/Benchmarks/<div class="markdown_content"><pre>--- v1 +++ v2 @@ -1,3 +1,30 @@ <h1>Benchmarking</h1> +Several check of the code have been performed with respect to analytical calculation and with other Monte-Carlo codes +[TOC] + +## Analytic benchmaking + +* Geometry : Two material foils witin a vaccum tub + * Titanium (VF=-50neV), two 15µm foils + * Aluminum (VF= 50neV), 30µm and 300µm foils +* Generation : Neutron beam normal to the foils with uniform velocity distribution +* Observable : Transmission of the neutron beam as a function of the energy. + + + +## Comparison with MCucn + +MCucn is a ucn code developped for the PSI nEDM experiment. + +* Geometry : Closed cylinder, H=15cm, R=25cm, VF=230neV, d=0, &eta;=0 +* Generation : Neutron are generated uniformly on the bottom of the cylinder +* Observable : Positon of the center of mass of + + +MCucn results, courtesy of Dr. Geza Zsigmund + +## Comparison with Geant4ucn + +Geant4 results, courtesy of Mr. Florent Lafont </pre> </div>Benoit CLEMENTSun, 13 Apr 2014 11:03:11 -0000https://sourceforge.netde9211e07d472eeb8ffe59a4133de2dbd6db739dhttps://sourceforge.net/p/starucn/wiki/Benchmarks/<div class="markdown_content"><h1>Benchmarking</h1> </div>Benoit CLEMENTSat, 12 Apr 2014 10:23:02 -0000https://sourceforge.net5e5f2f3271677ff8a802fb45cb7a565d659ba129