Sample with edges flame polished in Glasgow
Installation
- into the chamber and balanced at 11am. Pump down started at 11:00am.
- it looks like the turbo pump shaked the sample too much and moved it significantly. At 11:44am I had to tweak a bit the input steering periscope to avoid the outgoing beam to be clipped on the pickoff mirror
- roughing pump off at 2:27pm
- excitation at 2:36pm (2000 V, 30 s)
Results
 
 
% Freq First Q of pair Second Q of pair
1117.4 2.3392e+07 2.3392e+07
2555.9 1.8650e+07 1.8650e+07
4441.1 1.3003e+07 1.3003e+07
6759.2 1.6003e+07 1.5656e+07
6781.8 1.4795e+07 1.4795e+07
9499.2 5.6765e+06 5.6765e+06
10219.5 1.3148e+07 2.7060e+06
10222.3 1.3909e+07 4.2609e+04
11444.0 2.0756e+06 6.5364e+05
12649.4 1.0264e+07 8.7228e+06
12650.7 8.6808e+06 8.6808e+06
14176.3 1.0290e+07 1.0290e+07
14177.5 1.0185e+07 1.0185e+07
16113.7 1.0856e+07 9.7535e+06
16202.5 8.6733e+06 5.0176e+06
18619.0 1.3113e+07 1.3113e+07
18622.1 1.4864e+07 1.4864e+07
20149.0 1.4047e+06 1.4047e+06
21348.8 6.9944e+06 6.9944e+06
21353.3 8.0679e+06 3.1734e+05
23529.5 1.3076e+07 1.3076e+07
24482.3 9.6841e+06 9.6841e+06
24669.1 4.8629e+06 4.8629e+06
24670.5 6.3609e+06 6.3609e+06
25499.2 5.2216e+06 5.2216e+06
25828.0 3.3780e+06 3.3780e+06
27101.0 1.4934e+07 1.4934e+07
27103.5 1.4956e+07 1.4956e+07
28883.5 1.2076e+07 1.2076e+07
29068.6 1.1494e+07 1.1494e+07
29072.0 9.7555e+06 9.7555e+06
29190.0 5.9610e+06 5.9610e+06
29193.2 7.9280e+06 7.9280e+06
29502.2 7.8254e+06 7.8254e+06
30867.0 6.3681e+06 6.3681e+06
31267.0 1.6836e+06 1.4541e+05
32194.4 5.3275e+06 5.3275e+06
32200.0 5.9215e+06 2.6587e+06
The following plot compares the Q measured on this sample yesterday here at Caltech with the GeNS system, with the measurement perfomed by Raymond Robie in Glasgow.
- blue dots: measurements on the flame polished sample here at Caltech
- orange crosses and yellow triangles: Raymond’s measurements on the flame polished sample at in Glasgow (after annealing)
- purple crosses: typical Q values measured on disk samples (not annealed nor flame polished) here at Caltech
Flame polishing of the edges did not change significantly the Q we measure with the GeNS system. However, the GeNS system rovide systematically higher Q values for basically all measurable modes.
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