Opened 2 years ago

Last modified 15 months ago

#812 accepted enhancement

Provide model for the Pringle-Schmidt helical form factor

Reported by: smk78 Owned by: tim
Priority: minor Milestone: SasView 4.3.0
Component: sasmodels Keywords:
Cc: Work Package: SasModels New Model

Description

Request from Ian Hamley (i.w.hamley@…):

Would be possible to incorporate the Pringle-Schmidt helical form factor into SasView? It is used in quite a few studies now. There are other helical form factors (see attached) but the Pringle-Schmidt form factor is more generally and more widely used.

I don’t have code although I know some people who might – Heinz Amenitsch or Pierre Terech. These two groups also have data and fits in their papers.

I have datasets waiting to be fitted, as does Daniel Hermida-Merino at the ESRF.

Attachments (3)

a08538.pdf (417.6 KB) - added by smk78 2 years ago.
Original Pringle-Schmidt paper (1971)
MaHelicalRibbonFormFactor.pdf (619.6 KB) - added by smk78 2 years ago.
Hamley Overview of Helical Ribbon form factors
Teixeira_et_al-2010-Journal_of_Applied_Crystallography.pdf (755.5 KB) - added by smk78 2 years ago.
Teixeira form factor of Helical Tape

Download all attachments as: .zip

Change History (11)

Changed 2 years ago by smk78

Original Pringle-Schmidt paper (1971)

Changed 2 years ago by smk78

Hamley Overview of Helical Ribbon form factors

Changed 2 years ago by smk78

Teixeira form factor of Helical Tape

comment:1 Changed 2 years ago by tim

  • Owner set to tim
  • Status changed from new to accepted

comment:2 Changed 2 years ago by butler

  • Priority changed from major to minor

Given the existence of the marketplace as a distribution mechanism and the impact to 4.1 this could easily be moved to 4.2 and should not impact the release of 4.1. Will leave here for now as work is ongoing and depending on when the freeze is this could make it in.

comment:3 Changed 2 years ago by butler

  • Component changed from sasmodels to sasmodels Markeplace
  • Milestone changed from SasView 4.1.0 to Admin Tasks

comment:4 Changed 2 years ago by smk78

Tim has coded a model and uploaded it to the Marketplace. (But has been unable to upload an example dataset because of Ticket #685)

Ian has been told the model is available and has been given instruction on how to implement and use it. We await feedback from him!

If/when the model is given the thumbs up it should be added to the sasmodels library.

comment:5 Changed 2 years ago by tim

I have now heard from Ian and he is using the model with some of his data. Presuming that this returns a sane result then this ticket can be closed.

comment:6 Changed 23 months ago by butler

  • Milestone changed from Admin Tasks to SasView 4.1.0

comment:7 Changed 22 months ago by butler

  • Component changed from sasmodels Markeplace to sasmodels
  • Milestone changed from SasView 4.1.0 to SasView 4.2.0

This is available in the marketplace and at any rate in no way a blocker for this release.Given the imminent freeze for a 4.1 release am going ahead and moving this to 4.2.

comment:8 Changed 15 months ago by butler

  • Milestone changed from SasView 4.2.0 to SasView 4.3.0
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