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The Nd: Yag Laser


Nd:YAG Layout | Operations Data | Nd:YAG Statistics | Gun Hutch

 

ATF's Nd:YAG Laser Preformance Statistics

The energies reported in the laser room are a mean of the daily readings taken when the system is prepared for an experimental run, typically this is done first thing in the morning. Energies are is done first thing in the morning. Energies are also recorded when the configuration of the system is changed in the middle of a run at the operator's request. Each time data is recorded, the mean and rms of 50 shots is used. The cathode energy and rms jitter is also recorded daily for each run, but the sample size is 500 shots.

The phase stability is estimated from the phasemeter data logged throughout the weekly running period, excluding sudden jumps in phase. It represents the typical FWHM range in phase that would be encountered over a period of 10-15 minutes, measured over the bandwidth 0-10 Hz.

Position jitter is measured near the gun in UV at the cathode conjugate image plane. The beam centroid is calculated, and the RMS over 50 shots is expressed as a percentage of the beam diameter, which is typically 2-3 mm.

The flatness is measured from the CCD image of the UV on the cathode monument. Horizontal and vertical slices are taken through the center of the spot. Mean intensity and rms variation about the mean are calculated for the portion of each slice above 50% of peak intensity, and the rms is reported as a percentage of peak intensity. Measured this way a perfect flattop would have an rms of 0, while an ideal gaussian would have an rms of 19%.

  Preamp. Amplifier Green UV Cathode Phase Position Flatness
Date Amp.
mmJ, mean		 Jitter
rms
%		 Amp.
mJ,
mean		 Jitter
rms
%		 Amp.
mJ,
mean		 Jitter
rms
%		 Amp.
mmJ
mean		 Jitter
rms
%		     Amp.
mmJ
mean  		Jitter
rms
%		 Drift
ps		 Horiz.
jitter
%		 Vert.
jitter
%		 Horiz.

%

 Vert.

%
12/8/2000 174.2 1.127 31.04 1.564 1.193 3.4 238.4 3.09 16.37 1.8 0.15 0.2 0.15 8 8
12/15/2000 152.94 1.463 27.2 1.628 2.128 2.9 370.1 3.91 37.28 1.625 0.2 0.1 0.1 17 15
12/22/2000 119.9 1.918 25.88 2.048 4.08 3.19 650 6.31 84.3 2.6 0.2 - - - -
12/29/2000 136.5 1.319 28.14 0.782 0.972 2.78 190 2.37 30.8 1.6 - - - - -
1/5/2001 161.7 1.128 30.1 1.669 1.002 2.86 192 3.29 25.14 1.76 0.2 0.18 0.15 17 13
1/12/2001 139.03 1.435 27.37 1.906 1.048 2.32 212.9 3.02 20.03 1.667 0.3 0.1 0.1 10 12
1/19/2001 140.1 1.462 29.07 1.585 1.085 2.9 184.8 4.79 19 1.3 0.15 0.2 0.1 10 12
1/26/2001 151.35 1.409 30.6 1.611 1.077 2.99 182.9 4.18 14.6 1.8 0.4 0.25 0.15 10 10
2/2/2001 148.35 1.85 29.72 1.585 1.07 2.99 194.9 2.41 17.78 2.3 0.3 0.3 0.1 10.5 12
2/9/2001 146.6 1.334 29.37 1.991 1.281 2.63 190.3 3.62 14.94 1.545 0.3333 0.25 0.15 9 9
2/16/2001 145.1 1.447 29.2 1.815 1.483 2.56 191.2 4.92 7.3 1.205 0.3 0.25 0.15 9 9
2/23/2001 140.75 1.497 28.97 1.595 1.432 3.31 200.2 4.6 12.61 1.474 0.325 0.25 0.15 10.25 10.75
3/2/2001 156.48 1.87 29.88 1.255 0.979 3.38 214.4 3.14 11.37 1.451 0.15 0.2 0.1 9.5 11.25
1/11/2001 255.45 1.284 29.35 2.011 1.831 2.57 283.5 3.01 8.765 1.795 0.15 0.2 0.2 14 11
3/8/2002 444 1.007 14.96 3.381 1.857 5.85 274.2 2.63 9.81 1.121 0.15 0.3 0.2 9 7
7/19/2002 475.17 0.847 25.49 0.892 1.426 1.46 184.7 2.43 14.7 1.13 0.075 0.2 0.2 10.667 14
7/15/2003 518.8 0.9 17.69 2.6 1.290 2.9 84.2 4..9 9.29 1.0 0.50 0.2 0.1 10 8
8/22/2003 512.0 0.7 18.2 1.9 - - 105.450 5.4 8.90 0.9 - 0.2 0.1 11 9
10/24/2003 626.5 1.2 27.9 1.5 1.451 2.2 141.6 3.1 8.29 0.9 - - - 10 9
10/31/2003 614.0 0.9 24.8 1.2 1.367 2.2 135.1 5.3 9.03 0.6 - - - 9 8
12/12/2003 568.7 1.7 30.5 1.1 1.451 2.0 108.45 4.2 9.50 0.9 - - - 10 11
12/19/2003 614.0 1.8 29.7 1.4 1.399 2.3 113.2 3.7 9.30 0.7 - - - 11 16

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Last Modified: December 3, 2007
Please forward all questions about this site to: Vitaly Yakimenko
 


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