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Entry  Wed Oct 5 22:59:11 2011, Koji, Frank, Notes, Seismic, mechanical properties of new stack  
    Reply  Thu Oct 6 03:37:44 2011, Koji, Notes, Seismic, Modeling of the vertical isolation of the stack vertical_isolation.pdfvertical_isolation.zipvertical_isolation_plot.pdf
       Reply  Tue Oct 25 22:03:32 2011, frank, tara, Notes, Seismic, Modeling of the vertical isolation of the stack nb.png
          Reply  Wed Oct 26 18:05:49 2011, frank, tara, Notes, Seismic, Modeling of the vertical isolation of the stack 6x
             Reply  Thu Oct 27 20:45:58 2011, frank, tara, Notes, Seismic, ring down measurement for rubber spring fit4.pngfit1.pngcomparefit.pnghist.png
                Reply  Thu Nov 3 01:55:03 2011, Frank, Notes, Seismic, ring down measurement for rubber spring 
             Reply  Fri Oct 28 14:04:22 2011, frank, tara, Notes, NoiseBudget, Noise budget for unfloated table beat_27.pngbeat_27.fig
                Reply  Wed Nov 16 19:11:38 2011, tara, Notes, NoiseBudget, seimic coupling to beat noise 
                   Reply  Thu Nov 17 23:30:19 2011, tara, Notes, NoiseBudget, vertical seismic coupling to beat noise SETUP_2011_11_17.pngfreq_resp.pngfreq_resp.fig
                      Reply  Wed Nov 30 19:00:42 2011, tara, Notes, NoiseBudget, vertical seismic coupling to beat noise Seismic_resp.pngSeismic_resp.figSNR.png
Message ID: 713     Entry time: Tue Oct 25 22:03:32 2011     In reply to: 697     Reply to this: 716
Author: frank, tara 
Type: Notes 
Category: Seismic 
Subject: Modeling of the vertical isolation of the stack 

From Koji's code. I added vertical seismic noise from a single cavity, no common mode rejection. There are some modification from the code. The spring constant is 45 e3. M1 = 12.3, m2 =5.44.

The seismic noise in this projection is the data taken last week, see psl:696.

 nb.png

The coupling between acceleration noise to length noise is1e-9 * L  [m/(m/s^2)]. It is different from the value from FEA because our supporting positions are not exactly the same as the optimum point. It might be off by a few mm. The peak around 6.7 Hz is from Horizontal motion which has not been incorporated in the plot yet.

The noise budget code and auxillary files & functions will be committed on svn.

 

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