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What are the obstacles to building a pen-sized free-electron laser?
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Greg Hansen
electronics forum beginner


Joined: 11 May 2006
Posts: 17

PostPosted: Thu Jul 20, 2006 1:40 am    Post subject: Re: What are the obstacles to building a pen-sized free-electron laser? Reply with quote

Radium wrote:
Quote:
Phineas T Puddleduck wrote:

In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>,
Radium <glucegen1@excite.com> wrote:


Well, to begin with, the size of the accelerator required.

Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?


Are you seriously asking this question?


Yes.

Vacuum tubes seem to work pretty well.

Seal it off with a getter to help maintain the vacuum. Electrons can be
accelerated electrostatically with a high voltage applied to electrodes
at each end. High voltages from batteries are no big trick, e.g. camera
flashes, although the current will be highly limited. Permanent magnets
along the tube can act as benders and wigglers.

Now, having laid out that basic plan, I have no idea if you'd actually
get a beam from it. Even big and fancy free electron lasers haven't
lived up to their promise, although efforts continue.
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Phat Bytestard
electronics forum beginner


Joined: 15 Jul 2006
Posts: 49

PostPosted: Thu Jul 20, 2006 2:15 am    Post subject: Re: What are the obstacles to building a pen-sized free-electron laser? Reply with quote

On Wed, 19 Jul 06 09:07:19 GMT, jmfbahciv@aol.com Gave us:

Quote:
In article <a7hvg.20$25.582@news.uchicago.edu>,
mmeron@cars3.uchicago.edu wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>, "Radium"
glucegen1@excite.com> writes:

mmeron@cars3.uchicago.edu wrote:
In article <6h1uo3-2hp.ln1@mail.specsol.com>, jimp@specsol.spam.sux.com
writes:
In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:

All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?


Thanks,

Radium

You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?

Well, to begin with, the size of the accelerator required.

Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?

Sure. Just do the following:

step 1: behave nicely the whole year.
step 2: come December, ask Santa Klaus to deliver the items above.
step 3: go back to step 1.

Huh? I thought you physicists asked the purple unicorn for
gifts. I'll never keep this stuff straight.


First, the guy asks about "free electron" "powered" devices, then,
upon hearing that there is no POWER available in such realms, he now
wants HV supplies.

I made an HV supply at 15kV that would fit six units in a pack of
cigs.
Ran off 3 volts. Anyway, laser diodes don't need that much to feed
'em.
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jmfbahciv@aol.com
electronics forum addict


Joined: 30 Oct 2005
Posts: 60

PostPosted: Thu Jul 20, 2006 9:16 am    Post subject: Re: What are the obstacles to building a pen-sized free-electron laser? Reply with quote

In article <1153357090.258108.302040@m79g2000cwm.googlegroups.com>,
"Radium" <glucegen1@excite.com> wrote:
Quote:

Phineas T Puddleduck wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>,
Radium <glucegen1@excite.com> wrote:

Well, to begin with, the size of the accelerator required.

Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?


Are you seriously asking this question?

Yes.
You will cease getting silly answers if you ask where you

can find more information about your ideas. It is perfectly
reasonable to have one that won't work but you do need to
do your own research. Finding all this stuff out on your
own is fun. Most of the scientists here will be glad to
point you at reading and lab material.

/BAH
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Google

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