[time-nuts] HP 5061B Beam Tubes

I don't think you need very high temperatures to move alkali atoms like Cs, Rb, or Na around in a vapor cell. The trick is to have one part of the cell much colder than the rest. The Cs will automatically go the coldest spot. The temperature just sets the rate at which it moves. I remember

[time-nuts] New atomic clock

There's an interesting and more readable PRL by the same group, published last year on June 2 . Its on arXiv: 1110.2379v1 . or PRL 106, 223001 (2011). They have already built the trap and have laser-cooled the Thorium ions (cool pictures of the ion crystals). Their current problem is

[time-nuts] Allan varaince by sine-wave fitting

thanks for the comments. I'm off on a vacation for 1 week followed by a conference for 1 week. My connectivity may be poor, so I'll reply when I get back. Ralph KM6IYN ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Allan variance by sine-wave fitting

Hi, The fitting routine only takes up 40 uS of the 1 sec interval between measurements, as shown in Fig. 1 of the paper. This is less than 10(-4) of the measurement interval. It just determines the phase difference at the start of every second. I don't think the filtering effect is very

[time-nuts] Allan variance by sine-wave fitting

Hi Time-nuts and Attila, Thanks for the very interesting and informative criticisms. That is what I was looking for. I don't agree with most of them, but I need some time to work out some detailed answers. To focus on the forest instead of the trees: The method uses a $300

[time-nuts] Allan variance by sine-wave fitting

Here's a short reply to the comments of Bob, Attila, Magnus, and others. Thanks for reading the paper carefully. I appreciate it. Some of the comments are quite interesting, other seem off the mark. Let's start with an interesting one: The issue I intended to raise, but which I'm not sure I

[time-nuts] Allan variance by sine-wave fitting

I've been comparing the ADEV produced by the sine-wave fitter (discussed last November) with that of a counter-based system. See the enclosed plot. We ran the test in Leo Hollberg's lab at Stanford, using a 5071a Cesium standard and my own 5065a Rubidium standard. Leo first measured the ADEV using

[time-nuts] Allan variance by sine-wave fitting

Hi Tom, to reply to your questions: (1) Yes, I was also surprized at how good the 5065a is. It's a stock unit that has apparently never been repaired or modified. I'm guessing it was turned off for a long time (the seller said it was stored in an unheated container in Alaska). Leo's lab is very

[time-nuts] Nice Dual mixer and 2 channel counter for DMTD work

Are schematics available? Ralph ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.