Development of a low material endplate for LP1 and ILD Dan Peterson, Cornell At previous meetings, , showed the carbon fiber molded in the channeled small test beam Now, measurements of the test beams progress on construction models for LP1 space-frame endplate

Next Plan (from ) Make a series small prototype test beams that can be used for understanding the ability of the FEA to model the assembly. (1) LP1 (2) Al-carbon-fiber hybrid (3) Space frame : reported that the carbon fiber had been molded in the channeled beam Now: the Al-carbon-fiber hybrid beam has been machined and measured.

uniform load center load center load center load mass deflection deflection MEASURED MEASURED kg mm mm mm mm LP Al-C hybrid 1.71 ( 1 part fiber : 1 epoxy) Al-C hybrid 2.12 ( 0.25 part fiber : 1 epoxy) channeled (channeled for the hybrid, but without adding carbon) space-frame (without end straps) Deflections are predicted with the FEA using the usual 100N force.

Models of components for the LP1 space-frame endplate are in progress inner plate outer disc strut mounts (5 types) (1) all “in-row” have common dimensions inner and outer plate use same part (2) all “above-row” have common dimensions (3) inner and outer plate use mirror images (4) outer circle (5) inner and outer plate use mirror images Working on strut components Must add module mounting holes field cage termination mounts, HV, holes light insert device holes “Fun Holes” must be relocated. Temporarily held together with 2 phony struts