Problem with bender component

[Per-Olof Åstrand]

Hi,

Thanks for pointing this out. I have put the new version in the McDoc source and both the
Risø and ILL web-pages will be updated automatically by the McDoc program.

Since Bender.comp is available at the web-pages but is not a part of the official McStas
release, it gives me the opportunity to elaborate on this. The web-pages at Risø and ILL
generated by the McDoc program contain components from the official release, unofficial
components provided by users, and updated versions of official components. Just by inspection
on the web-page, it may be very difficult to be able to decide which of these categories a
component belongs to. For the official components developed at Risø, the "Origin" entry
always say "McStas release", even if it is an updated component different from the version in
the official release. For components kindly provided by users, the "Origin" entry is mostly
used for giving a geographic origin regardless of if it is an official component or not.

For me (and I guess also for others), some time is spent for each component (e.g. the Bender
component) to figure out where its "origin" is. I therefore suggest that the "Origin"
definition in a component can only contain three different entries: "McStas release", "McStas
release,  updated version" and "Unofficial", and that the "Authors" definition is used for
specifying the geographic origin. I would like to have some response on this, otherwise I
will just implement it in a week or so.

Finally, the McDoc program is a very efficient tool maintained by ILL and Risø for sharing
components and keep them up-to-date. Users are therefore encouraged to make their components
public either by sending them to us or to establish an additional web-server handling McDoc
(which is not too difficult) in addition to ILL and Risø. If a component is of general
interest, it may eventually be, with the permission of the author, included in the official
McStas release and documented in the manual.

Best regards,

Per-Olof Åstrand

Stuart Rycroft wrote:

> Hello
>
> I just wanted to mention a problem with the bender component, which can be
> downloaded from the Riso or ILL website.  They both have an early version
> of the component (Feb. 7th 1999) but from the email archive, a later
> version (Feb. 22nd 1999) was sent by the author (Philipp Bernhardt) which
> corrects a small bug in the calculation of the reflectivity for the top
> and bottom mirrors.  Without this correction the output from my simulated
> guides is obviously not correct when looking at the divergence, but it is
> very hard to see a problem when just looking at an intensity since the
> only effect I have seen is a small loss, maybe around five percent.
>
> The updated component and the problem are given by the author in the
> mailing archive:
>
> http://neutron.risoe.dk/cgi-bin/wilma_hiliter/neutron-mc/9902/msg00023.html?line=24#hilite
>
> Maybe the component list on the Mcstas webpages should have this version
> instead of the old one.
>
> Regards,
> Stuart Rycroft
> IRI, Delft
>
>