Sblcm develop - [closed]

[jonmaddock]

In GitLab by @schislet on Nov 19, 2019, 14:19

_Merges SBLCMdevelop -> develop

I have written a new Nb-Ti subroutine intended to supersede the outdated jcrit_nbti that is currently in use. The extant model is based on an old scaling law that has not been used by the superconductivity community for decades. It was also fit to old strands, which have different upper critical fields (Bc2,0) and critical current densities (Jc(B,T)) from ITER specification Nb-Ti strands. The new model is based on the "Durham scaling law" (itself based on Ginzburg-Landau theory, rather than the pure empirical derivation of the extant model), which has been fit to Jc(B,T) data from 5 ITER specification strands (see the attached document). The new model also incorporates Nb-Ti's strain dependence for completeness. The strain scaling was derived from measurements shown in the attached paper. The new model is a far more accurate representation of the critical surface of ITER specification Nb-Ti.

costs_supercond.f90 - A copy of costs.f90. Added costs_supercond function. Changed acc2221 so that the cost of superconductors is calculated in $/kAm (the industry standard). When this is used in the input file, the variable 'fsupco' should be adjusted for the particular superconductor(s) in use: 1.0 for NbTi, 6.4 for Nb3Sn and 80.6 for REBCO (these are subject to change as the technology develops but are Durham's current recommendations).

superconductors.f90 - added the subroutine GL_nbti (described above)

sctfcoil.f90 - added case(7) for GL_nbti

pfcoil.f90 - added case(7) for GL_nbti. Added secant solver for GL_nbti (already in use for WST and the extant NbTi models).

caller.f90 - added call costs_supercond_module.

input.f90 - added fsupco, fjcrit, fbcupper. fjcrit allows for factor increases in Jc in the Nb-Ti model. fbcupper defines the zero-temperature upper critical field of the Nb-Ti model (nominally 14.86 T).

global_variables.f90 - added fsupco, fjcrit, fbcupper

Also, looking through the global variables files. The default PFcoil choice is ITER Nb3Sn (isumatpf = 1). Is this intended or an oversight?

It also means that CFETR, FNSF, and the stellerator inputs in the test suite use ITER Nb3Sn for their PF coils - as they use the default...

As such, I have changed the default PF coil choice (isumatpf) to GL_nbti (case(7)) from ITER Nb3Sn (case(1)). I've also changed the test suite input files to reflect this. I.e. some before were set with isumatpf=3, now they are isumatf=7. Others did not have an explicit choice and as such were set to the old default (ITER Nb3Sn). These have been changed such that they now explicitly have isumatpf=1.

[20191115_Nb-Ti_update_v1.0.docx](https://git.ccfe.ac.uk/process/process/uploads/93fff30a3b760622a2f3245b827b9cee/20191115_Nb-Ti_update_v1.0.docx)

[20190110Simon_EUCAS_2019.pdf](https://git.ccfe.ac.uk/process/process/uploads/2e542380fecce3269294d7fad8da436f/20190110Simon_EUCAS_2019.pdf)

[jonmaddock]

In GitLab by @schislet on Nov 21, 2019, 15:58

added 1 commit

• 780a1f23 - changed output_module.f90 so that it writes the costs when using the 1990...

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[jonmaddock]

In GitLab by @schislet on Nov 21, 2019, 16:03

added 1 commit

• 4b16b803 - turned off the 'hack' in physics.f90 that was used to look at STs

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[jonmaddock]

In GitLab by @schislet on Nov 25, 2019, 10:44

added 2 commits

• 0b43b700 - Added case (7) for Gl_nbti to the TF coil temperature margin calculation in sctfcoil.f90
• 35209a59 - Making sure that the temperature margin calculation is switched on for GL_nbti

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[jonmaddock]

In GitLab by @schislet on Jan 7, 2020, 15:03

added 101 commits

• 35209a59...3ba3e1b1 - 100 commits from branch develop
• f0e7d1c2 - Merge branch 'develop' into SBLCM_develop

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[jonmaddock]

In GitLab by @schislet on Jan 8, 2020, 12:47

added 101 commits

• 35209a59...3ba3e1b1 - 100 commits from branch develop
• e57f8bca - Merge branch 'develop' into SBLCM_develop

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[jonmaddock]

In GitLab by @jmorris-uk on Jan 28, 2020, 22:09

closed