View source for Friday, October 23, 2020 1pm ET

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== Agenda ==

* status of segmented vs. hybrid downselect
* CTD450 summary
* optimization of the upstream collimator region 
** merging - Chandan
** shielding - Naz
* nomenclature

== Minutes ==

Attendance:  <br><br>

* status of segmented vs. hybrid downselect
** meet with change control board just before Christmas (Dec. 15)
*** downselect by end of November 
*** couple page report, Pugh matrix
*** prioritize what is important for the downselect
** issues
*** coil forces
*** blocky models for upstream and several for segmented ds
**** improved winding design for US (more realistic, with leads)
**** second blocky for the US torus (b/c exceeded J) w/ 6 turns 
** section views down the length with clearances 
*** when will need new envelopes (what is the turnaround time?)
*** clearances with current envelopes are good enough for hybrid vs. segmented downselect
* CTD450 summary
** CTD 403 - literature search - best resin (cyanate esther) to use
** conductor half-lapped with S- or E- glass cloth (probably S, b/c better with CTD403)
** tests on short-beam shear stress at CERN (but at 4K)
** what about 70 degrees?
** primed with CTD 450 - stronger initially
** the stresses are ~11 MPa (during curing and cool-down)
** thermal stresses during operation ~5 MPa
** stresses at corners ~25 MPa
** primed w/ CTD 450 (assuming 15% reduction in strength) is 61 MPa final shear strength
** can we do stress tests with thermal cycling and dose?
** need to make sure we have checked with worst-case offsets (I think we have)
** 70 C, vacuum pumping, irradiation - trying our best to destroy it! 
** physicists will read the dose/strength papers
* optimization of the upstream collimator region 
** merging - Chandan (not here)
** shielding - Naz
*** may be possible to reduce the weight of the W plates by optimizing
*** nose shield can still be optimized by increasing the thickness radially inward
* nomenclature


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