Brett and Mark The matlab parameter file quadopt_fiber.m has been updated on the svn with the values found from the H1ETMY fitting results. The corresponding temporary file quadopt_fiber_H1ETMY.m has been removed. The parameters have been moved by the following amounts: --------------------------------------- mn: 0 g Inx: -1.1168 % Iny: 3.0445 % Inz: -0.87769 % Inxy: 0 kgm^2 Inyz: 0 kgm^2 Inzx: 0 kgm^2 hn: 0 mm m1: 473 g I1x: 4.0141 % I1y: 12.3876 % I1z: -0.087956 % I1xy: 0 kgm^2 I1yz: 0 kgm^2 I1zx: 0 kgm^2 h1: 0 mm m2: 43 g I2x: -2.9363 % I2y: 8.4274 % I2z: -0.034308 % I2xy: 0 kgm^2 I2yz: 0 kgm^2 I2zx: 0 kgm^2 h2: 0 mm m3: 10 g I3x: 2.1949 % I3y: -8.9273 % I3z: 0.70939 % I3xy: 0 kgm^2 I3yz: 0 kgm^2 I3zx: 0 kgm^2 h3: 0 mm ln: -0.183 mm l1: -0.212 mm l2: 9.121 mm l3: 0 mm rn: 0 mm r1: 0 mm r2: 0 mm Yn: 0 % Y1: 0 % Y2: 0 % su: 0 mm si: 0 mm sl: 0 mm nn0: 0 mm nn1: 0 mm n0: 0 mm n1: 0 mm n2: 0 mm n3: 0 mm n4: 0 mm n5: 0 mm kcn: 1.0376 % kc1: 1.091 % kc2: 2.2895 % kw3: 9.4232 % kxn: 0 % kx1: 0 % kx2: 0 % dm: 0 mm dn: -0.22438 mm d0: 0 mm d1: 1.8536 mm d2: 0 mm d3: 0 mm d4: -4.8596 mm --------------------------------------- Note, the mass values were changed to the as-built values from H1 ETMY. The wire lengths changes are updated values found from the mathematica model, which is the origin of the matlab. Note that the pum wire length (l2) is within about 0.1 mm of that found from the model fitting code. All other values are from the model fitting. Ref https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=10089. The d4 change is probably not so large in reality because it can be distributed between d3 and a little bit of d2. The change in kw3 (fiber bounce stiffness) is likely due to the fact the the original value was from the LASTI fibers, which may not be exactly the same. The pitch inertias also changed a lot, which I cannot readily explain, but it could be there is some degeneracy with the updates in the d values. There is still a mystery on the wire lengths, where the lengths the model requires as determined by the master mathematica model are different by a few mm from those we cut them to. The context for this can be found in these previous log entries: ETMY model fitting results - https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=10089 PUM wire length calculation - https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=10476