Id :	335
Type :	BUG
Reporter :	Fredrik Johansson
Assignee :	Benoit Thiebault
Priority :	BLOCKER
Creation Date :	20 Jan 16 03:26
Last Update Date :	20 Jan 16 04:56
Resolution :	Fixed

Hello!

I'm getting a SEE yield of 1 at 10eV electrons for ITO (no modifications) for a negatively charged spacecraft doing Langmuir probe sweeps in a cold plasma.

More info below:

I'm doing some Langmuir probe sweeps with secondary electrons from electron impact (SEE). It's not very straight forward as you know, as the SEE sweep current will only give me the collected current, and not the emitted current. This is sort-of okay when dealing with photoemission, since we can assume it to be static during the sweep, but since the electron current increases as the probe steps upwards in bias, so does the secondary emission.

(This is an issue I really wish somebody would fix, but that's a different topic. Also, I found a complex way) around this by using the emitted_currents.txt file, and very carefully modelling the emission)

however: look at the end result for the electron + SEE sweep http://imgur.com/PV6X2hj

Disregarding everything but the electron current (purple crosses) and the SEE collection current(blue dots), as they are outputted when doing the sweep

Already at Vb = 20 V, the collected SEE current is much higher than the collected electrons. This is about the point where most emitted SEEs are recollected by the probe, as seen in my model current(orange circles, the SEE sweep + modelled emission) approaches zero.

This represent (if I'm not going crazy) a SEE Yield of one, as the emission and collection is of the same size, and the current collection of SEEs from the spacecraft should be negligble since the spacecraft is highly negative an repel everything to infinity, so what's left are the secondaries emitted by the probe. That's the logic part, but It's also supported by the calculations I did of the emission.

a Yield of 1 at 20 Vb -> electrons accelerated by about 5 V, so 10eV tops. The SEEYield files in the simulation, SEEYield_materialId_ITOC material properties_isotropic.txt, (and others). state that the ITO should have a SEEYield of 0.24 at that point.

What is going on? Can somebody else confirm this? I've rerun the simulations and sweeps with different Emin/Emax, resolutions, steps, delay between steps. Can't make this huge secondary current go away.

Best regards, Fredrik

Wiki Syntax

Simple text filters

Mnemonic	Rendering	Comment
1 Title		a style 1 heading (major heading)
1.1 Title		a style 1.1 heading (minor heading)
- text		a list item (with -), several lines create a single list
* text		a list item (with *)
1. text		an enumerated list
__bold__	bold	simple bold text
~~italics~~	italics	simple italic text
--strike--	strike	strike through text
(empty line)		produces a new paragraph
\\		creates a line break, please use sparingly!
[/documentation] or [../documentation] or [/documentation|Doc]	Like a standard link	internal link to another document
http://www.libresource.org/	http://www.libresource.org/	creates a link to an external resource, special characters that come after the URL and are not part of it must be separated with a space.
\X	X	escape special character X (i.e. {)
----		creates a horizontal rule

Macros List

Macro syntaxe: {macroName:key1=param1|key2=param2|...}

Macro	Description	Parameters
api	Generates links to Java or Ruby API documentation.	1: class name, e.g. java.lang.Object or java.lang.Object@Java131 2: mode, e.g. Java12, Ruby, defaults to Java (optional)
asin	Generates links to DVD/CD dealers or comparison services. Configuration is read from conf/asinservices.txt	1: asin number
blink	Blink a text.	the text
bookmarks	Display the user bookmarks.	none
box	Create a box in order to change the basic disposition.	1. the box title (optional) 2. the floating behaviour (left or right) (optional) 3. the height of the box (px,%) (optional) 4. the width of the box (px,%) (optional)
children	Display the current children list.	1. uri= ...(optional) where you list the resources, the default uri is the current 2. groupby=… (optional) to group resources.The following value are available : type or owner or uri or creation or update or name 3. sort=… (optional) to sort resources. The values available are : type or owner or uri or creation or update or name 4. creation=...(optional) allows you to filter on the creation date. The values available are: Date (dd/MM/yyyy) or '+'/'-'/'!' followed by a Date(dd/MM/yyyy): allows to keep superior/inferior/exclude date 5. update=...(optional) allows you to filter on the modification date. The values available are: Date (dd/MM/yyyy) or '+'/'-'/'!' followed by a Date(dd/MM/yyyy): allows to keep superior/inferior/exclude date 6. type=...(optional) :allows you to filter resources with its type. The values available are : Project, Template, Timeline, Page, Repository, File, Forum, Thread, Message, Group, Synchronizer, BugTracker, Issue, Site, Survey, Form, DropBox 7. owner=...(optional):allows you to show only resources belonging to one user or many users. 8. limit=...(optional): allows you to limit the displayed resources 9. depth=...(optional): allows you to fix the depth of listed ressources 10. view=...(optional): to fix the view of displayed resources. The view available are : flat (default view) or count(to display the number of listed ressources) or tree(display resource following tree viewer)
code	Displays a chunk of code with syntax highlighting, for example Java, XML and SQL. The none type will do nothing and is useful for unknown code types.	1: syntax highlighter to use, defaults to java (optional)
hello	Say hello example macro.	1: name to print
html	By pass wiki engine to allow HTML code in content	the html block
api-docs	Displays a list of known online API documentations and mappings.	none
file-path	Displays a file system path. The file path should use slashes. Defaults to windows.	1: file path
image	Display an image.	1. the image URI 2. align (right ,left or center) (optional) 3. width (optional) 4. height (optional)
inter-wiki	Displays a list of known InterWiki mappings.	none
isbn	Generates links to book dealers or comparison services. Configuration is read from conf/bookservices.txt.	1: isbn number
link	Generate a weblink.	unexplained, lazy programmer, probably
list-of-macros	Displays a list of available macros.	unexplained, lazy programmer, probably
loginBox	Display a login box.	none
mailto	Displays an email address.	1: mail address
menu	Include the menu of the specified URI	1. The uri for the menu to be include
news	Display a message thread as news.	1. the thread URI 2. Max (optional)
pre	Allow rigid text style. (Keep text formating)	none
printField	Display a node forms fields values.	1. (uri=) The uri on which you want to get the form value (Optional, by default=.) 2. (print=) Print or not the field label and the field value (Optional, by default=label, value, edit) 3. (field=) Print or not the specified field (Optional, by default will print all)
quote	Display quotations.	1: source (optional) 2: displayed description, default is Source (optional)
quoteMessage	Quote a message in another message by referencing only the message URI.	1. The message URI to quote.
resource	Include the view of a LibreSource resource.	1. the uri of the resource (mandatory) 2. the view (optional) 3. the action (optional) 4. noaction (optional)
rfc	Generates links to RFCs.	unexplained, lazy programmer, probably
rss	Include an RSS feed.	1. the url of the rss feed (mandatory)
searchBox	Display a search box.	1. the URI pattern
subProjects	Display the current subProjects list.	none
summary	Create the summary of a wiki page.	1. the page URI (optional)
survey	Display results of a survey.	the survey URI
table	Displays a table.	none
tableForm	Display a table listing form results.	1. (uri=) The uri on which you want to get the form value (Optional, by default use the local path) 2. (print=) Print additinal features such as a link to the data (goLink) or a link to get a CSV file (csvExport) (Optional, by default print all) 3. (field=) The list of field to show (Optional by default all)
timeline	Display the first items of a timeline.	1. the timeline URI 2. Max items (optional)
user	Generate a link to the current user page, according 'action'.	1. the action (optional) 2. the link label (optional)
workspaces	Display the user workspaces.	none
xref	Generates links to Java Xref source code.	1: class name, e.g. java.lang.Object or java.lang.Object@Nanning 2: line number (optional)

Smiley

:-)	:-(	;-)	:-P	:-D	:-[	:-/	:-*	>:o	8-)	:-$	:-!	:'(	:-X =-O