kelseymh

Sep 25, 2008
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About:I've been an experimental high-energy physicist for 20 years (since I started graduate school in 1988). I got my BS in physics from UCLA, my Ph.D. at Caltech, and did a post-doc at UBC before moving to SLAC.

Being an experimentalist means that I got to learn how to use machine tools, to fabricate little parts and jigs with a mill and lathe, and to deal with Real Engineers to design and construct experiments. This was a great learning experience, and I've been putting it to good use ever since.

Since I got together with my wife, I've been doing assistive technology projects for her. Now I'm starting to do the same to make taking care of our daughter easier. Designing stuff is great fun, but actually taking it from two to three dimensions, especially for someone else, is even better.

Location:SLAC National Accelerator Laboratory (nee Stanford Linear Accelerator Center), IRC@kelseymh

Joined:Sep 25, 2008

Website:http://www.slac.stanford.edu/~kelsey/

Interests:Particle physics, science, SF, fantasy, beer, travelling, fatherhood

Age: 47

Gender: MALE

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Orangeboard

kelseymh's Instructables

view all 9 Instructables »

Modified Crib for Parent with Disability
10,245
Crib Modification for Accessibility
6,876
The Silence of the Toys
4,301
Observing single photons
5,420
Powered hitch-lift for three-wheel handcycle
3,363
Double-slit Interference Experiment
8,484

Comments

Orangeboard

iceng says: Nov 21, 2012. 11:34 AM

One hundred following you and more incoming. Happy Thanksgiving :-)

iceng says: Jul 20, 2012. 4:29 PM

Long time answering your previous query.

It is the LIDAR facility in Washington.
Which balances the two lasers in a vacuum with tune out notch at the
crystal return mirror resonant frequency and use the corrective drive as
the gravity signal information.

Speaking with my friend, the facility appears to have failed to confirm
Einstein's gravity waves from nearby orbiting dual suns or sun with
black hole.

kelseymh (author) in reply to icengJul 20, 2012. 5:22 PM

Can you remind me what my "previous query" was?

I think that rather than "LIDAR" (which is used by the police to catch speeders) you are thinking of the LIGO facility in Hanford, Washington. It uses a Michelson-Morley interferometer set up, with Fabry-Perot cavities on each arm, to look for gravitational waves.

Together with a similar detector in Livingston, Louisiana, it is looking for gravitational waves from astrophysical sources such as merging neutron stars or merging black holes. At present, the sensitivity of LIGO is still not quite good enough (there's too much background noise) to actually observe such signals.

Lithium Rain says: Jul 15, 2012. 5:11 PM

What, nothing on your Orangeboard about the Higgs? I am disappoint. :(

huck alexander says: Jul 2, 2012. 11:41 PM

Thank you for sharing your experience with a company who provides lazy susan-type bearings! This is why I love Instructables!

kelseymh (author) in reply to huck alexanderJul 3, 2012. 9:03 AM

No problem! I've used McMaster-Carr as a resource for about fifteen years, now, and haven't had any problems. Their catalog runs to something like 3,000+ really dense pages, with everything from individual nuts up to forklifts.

Lithium Rain says: Jun 11, 2012. 9:25 PM

Ping!

Long time no see! Just saying Hi. :) (Ooh, now I'm the first *and* second posts on your Orangeboard...stalker points, yay!)

kelseymh (author) in reply to Lithium RainJun 12, 2012. 8:58 AM

Well Hi to you too :-)

Lithium Rain says: Jan 8, 2012. 10:43 PM

Hi, Kelsey!

I wanted to ask a fairly random question here in order not to derail the established thread as it's so far off-topic. In the vegetarian thread, you wrote "I am completely in support of your opinions about CAFOs. The conditions there are appalling -- if (when) human beings were treated that way, the perpetrators were tried and executed."

I'm curious as to where you stand on the death penalty - given what I know about your general political slant I would think it likely that you oppose it across the board. However, (though I realize it doesn't *necessarily* reflect anything about what you think), I wasn't as sure after reading your comment. I found the thought of what Nacho calls a "Lotus Eating Leftie" tacitly finding capital punishment acceptable on a thread about animal rights rather interesting. Thus my curiosity. :D

(If you're not comfortable with the question (I don't know that I would be!), apologies and I can remove the comment.)

kelseymh (author) in reply to Lithium RainJan 9, 2012. 9:42 AM

In my comment, I was drawing an implicit historical parallel (i.e., to the Nazi concentration camps and subsequent Nuremberg trials). I do not favor the death penalty at all, for both moral and economic reasons.

ElvenChild says: Oct 9, 2011. 9:18 AM

Umm what exactly is a BS in Physics, because in english it means @!#$@%$##@#@$#$@$@#$%@%/#%#@#$#$#%#$%##@... or something like that?

kelseymh (author) in reply to ElvenChildOct 9, 2011. 2:36 PM

http://en.wikipedia.org/wiki/B.S.

kelseymh (author) says: Sep 24, 2011. 8:46 PM

[ Regarding OPERA's report of superluminal neutrinos: ]

I'm extremely confident that there's an unexpected, and subtle, systematic error in either the raw data or in OPERA's analysis. I've already done some back-of-the-envelope calculations for the obvious things (e.g., surface distance vs. line-of-sight) and they're the wrong order of magnitude.

When you read their paper, they go into great detail about their measurements, so I don't believe they've made any simple mistake.

I'm especially reassured by the three-dimensional GPS measurements of the L'Aquila (Gran Sasso) site (Fig. 7, page 10). The uncertainty in the measurements is quite clear from the scatter, and is just a few cm in each direction. The beautiful systematic trend of plate tectonics, with the theta-function from the earthquake in the middle, give me a lot of confidence that they have good data in hand.

kelseymh (author) says: Feb 1, 2011. 9:44 PM

"Error 400" reports, since October 2009:

http://www.instructables.com/community/Error-400-when-trying-to-add-something-to-Favorite/
http://www.instructables.com/community/Error-400-on-favorite/
http://www.instructables.com/community/Favouriting-projects/
http://www.instructables.com/answers/i-cant-favorite-any-instructable-whats-wrong/
http://www.instructables.com/answers/cant-save-to-favorites/

kelseymh (author) in reply to kelseymhFeb 3, 2011. 11:54 AM

http://www.instructables.com/community/favorite-button/

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