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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

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