NPRO crystal temperature scan

Summary
There are no places with the noise eater on where there is no broad peak in the NPRO PZT spectrum.  Turning off the noise
eater gets rid of the broad peak.

Conducted a scan of the NPRO crystal temperature (aka the SLOW actuator) and made a note of where a resonance appeared with the reference cavity.
Whilst doing so, spectra of the NPRO power noise and of the FAST actuator were taken whilst the FSS was locked.


	
NPRO crystal temperature scan
	

		

			
slider setting
			
crystal temperature
			
spectral image
		
	
	

		

			
-0.706
			
-0.81
			
NE_CompP.png
		
		

			
-0.699
			
-0.805
			
NE_CompN.png
		
		

			
-0.692
			
-0.80
			
NE_CompM.png
		
		

			
-0.436
			
-0.54
			
 
		
		

			
-0.434
			
-0.54
			
NE_CompL.png
		
		

			
-0.427
			
-0.538
			
NE_CompK.png
		
		

			
-0.177
			
-0.277
			
NE_CompJ.png
		
		

			
-0.169
			
-0.28
			
NE_CompH.png
		
		

			
-0.165
			
-0.27
			
NE_CompG.png
		
		

			
0.052
			
-0.06
			
NE_CompQ.png
		
		

			
0.082
			
-0.023
			
NE_CompA.png
		
		

			
0.088
			
-0.021
			
 
		
		

			
0.332
			
0.23
			
NE_CompB.png
		
		

			
0.339
			
0.23
			
NE_CompC.png
		
		

			
0.574
			
0.47
			
NE_CompD.png
		
		

			
0.576
			
0.47
			
NE_CompE.png
		
		

			
0.578
			
0.47
			
NE_CompF.png
		
		

			
0.585
			
0.48
			
 
		
	


 The measurements were recorded with the common gain set to 20 dB and the fast gain, 3 dB.  Lowering the common gain to 16 dB did not improve things.   In NE_CompA.png, the noise eater was off for the red trace and on for the blue trace.  All other plots are relative to this plot and were taken with the noise eater on.