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3373 clicks; posted to Geek » on 01 Oct 2013 at 11:49 AM (4 years ago)   |   Favorite    |   share:    more»

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 3 votes:

my_cats_breath_smells_like_cat_food: moistD: lilbjorn: I never heard of a porcupine imploding.  How does that work?

I assume it would be like a mol of moles

huh...I wonder if 6.02x10^23 moles would have enough mass that the gravity at the center would be strong enough to initiate a fusion reaction.

http://what-if.xkcd.com/4/
 2 votes:

my_cats_breath_smells_like_cat_food: moistD: lilbjorn: I never heard of a porcupine imploding.  How does that work?

I assume it would be like a mol of moles

huh...I wonder if 6.02x10^23 moles would have enough mass that the gravity at the center would be strong enough to initiate a fusion reaction.

Nope.
 1 vote:

draypresct: FTFA:

That got the NIF closer to the "scientific break-even point," where the amount of energy that comes out of the fusion reaction is equal to that which was put in by the kinetic energy from the implosion. (The energy from the laser isn't counted in the calculation). Right now, the amount of energy coming out of the NIF setup is about 80 percent of what is put in.

Sounds like the actual percentage is much, much lower than 80%.

Yes and no.

Imagine the laser is the starter of your car. When your car is turning over, you haven't "broke even" and started the car into a self sustaining state. Once the car starts, the starter de-activates, and the car is now able to replenish the energy used to start it over a little time while it keeps running until the fuel depletes.

The primary goal of fusors is to get them to run themselves. The fuel is so incredibly cheap and efficient that it is almost inconsequential the energy and costs it takes to start: it will be able to pay that back much sooner than any other tech out there.

/working on an IEC fusor, hopefully going to have time for a Polywell too.
 1 vote:

mark12A: Jeez, I wish they'd HURRY UP and scale up and demo polywell fusion to see if it actually works or not. The suspense is annoying me.....

Since the Navy is funding the work, it will be a long time before we hear anything.
 1 vote:
Jeez, I wish they'd HURRY UP and scale up and demo polywell fusion to see if it actually works or not. The suspense is annoying me.....
 1 vote:
I've been reading a good book called Ignition! that chronicles the development of rocket propellants. It took them about 30 years to get the fundamentals down, and they're just going from "bomb chemicals" to "rocket chemicals".

This is arguably a much harder job.

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