40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
 List  |  Find  |  Login  |  Help 
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: 716     Entry time: Wed Oct 26 18:05:49 2011     In reply to: 713     Reply to this: 717   718
Author: frank, tara 
Type: Notes 
Category: Seismic 
Subject: Modeling of the vertical isolation of the stack 

Today we floated the table, measured beat, measured TF between beat and horizontal, and added horizontal seismic to the noise budget.

  • Replaced 2 legs, floated table: monitor pressure, 2000psi @ Wed Oct 26 18:06:41 2011
  • Measure TF between beat and accelerometer signal
  • measure beat signal, when table is floated, optimized optics.
  • add Horizontal motion to noise budget
  • ring down measurements from rubber spring, see psl:717

details coming soon.

 

IMG_2170.JPG

fig1: accelerometer was mounted on the table to measure East-West motion (along beam line)

IMG_2171.JPG

fig2: details of the accelerometer

TF.png

fig3: TF between Beat signal and signal from acceleromter (East-West motion). The data is not calibrated yet. Sensitivity for beat = 7 kHz/V.

beat.png

fig4: Current beat noise: floated table. Seismic from horizontal motion is calculated by applying the measured TF to the measured acceleration on the floated table.

beat2.png

fig5: Current beat noise: floated table. Seismic from horizontal motion is calculated by applying the measured TF to the measured seismic noise (converted to acceleration) on the floated table.

Attachment 4: beat.png  50 kB  Uploaded Wed Oct 26 20:24:11 2011  | Hide | Hide all
beat.png
ELOG V3.1.3-