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make a cloud chamber using peltier coolers - where to purchase dry ice

make a cloud chamber using peltier coolers - where to purchase dry ice

2021-09-15
make a cloud chamber using peltier coolers  -  where to purchase dry ice
The cloud room lets you see the steam marks left by radioactive particles!
A version of this cloud room can now be purchased (
Fully assembled and tested)
Radioactive samples from cloud chamber assemblies and chambers work by generating oversaturation of alcohol vapor.
When the radiation ionizes the essence of the wine, the steam trajectory is formed.
The cloud room needs to be very cold (about -15f)-
So dry ice is needed for most designs.
This design is replaced with a cheap electrical "Peltier" cooler!
No need to buy/store dry ice!
It's quite easy to build-
It's only about $100.
The design of this chamber cooled quickly.
Steam marks can be seen in a few minutes.
The downside is
Not as cold as a dry ice room-
So the oversaturated area is not that thick.
Peltier cooler (need 2)-Model 12709 (Maximum power of 138 W)
For the "top" cooler ($8 on ebay)-Model 12710 (Maximum power of 168 W)
For the "bottom" cooler ($8 on ebay too)-Search eBay -descriptions-
Find the specific model-
Usually listed as "TEC", "thermoelectric" or "Peltier" cooler and prefixed TEC1 or CP1 as model
Other models with similar power levels may be used (
The power level of the bottom cooler should be slightly higher than the bottom)-
Cooler looks the same
Put a piece of tape on the 12710 wire so you can identify it later --
Bigger cooler is not necessarily better
Fragile wires break easilyavoid bending (
May want to buy a spare one or two)-Do -NOT-
Connect peltier to a power supply back or without a radiator! -
For information on a single page, see the bottom of this page-
Power supply 1-Peltier option
12 v and at least 8 amps (
Good results between 11 v and 15 v)-
For driving the "bottom" peltier coolerwww. allelectronics. com part PS-
1512 is a great choice for $25 power 2-
5 volts, at least 2 volts. 5 amps (
4 v to 8 v is good)-
Used to power the "top" peltier coolerD-
Connect JTA0302C power supply on ebay for around $10-
Alternative: use pc atx power for 12 v and 5 v power supplies (
Google for more information)
CPU cooler/fan-
Looking for "heat pipes" and 120mm fans-
Design that can run "upside down" with good airflow-
Hyper Master Hyper 212 works fine and is cheap (
Less than $30 on ebay)-
The Cooler Master V8 works fine and looks cool (about $50)-
Pirate H50 (liquid cooling)
Work better.
But more expensive/complicated (about $70)-
For other possible coolersalterative single Peltier/single power configurations, see-
This project can also use a single double
Stage peltier cooler-The19012-5L31-
06CQQ from custom thermoelectric ($53)
After testing, the effect is good (
Orders with moisture proof seal option)-
12 v power supply capable of 6 amps is required (
5 v power supply is not required)-
Other project details for SameSmall plastic container-
The bottom is relatively flat (
No need to be perfect)-
Quite thin plastic (1/16 "or below)-
Good transparency
Good results and Bai Shangpin 473 mL (about $5)
Northern silver 5 warm composite-
$ Month in the month of Radio Shack. 5 grams-
Should get 2 tubes (
You may get away with it if you are efficient-
The northern Silver "Ceramique" provides good results with less money (
The price of about $10 at Fry's is 22g)-
Other hot compounds/paste can work-Have -not-
Good luck with the "house brand" of Radio Shack-99% rubbing (isopropyl)
The best effect of alcohol (
$5 pharmacy)-
The other option is modified ethanol (
Paint section of hardware store)-
91% rubbing alcohol can also work (
Maybe not very good)Misc.
Electrical connector for connecting things-
Welding is another option. Don't use thin-
Crocodile clip Wired
They will have a flashlight (the cheap 9-
The effect of the LED is very good)
Black Sharpie felt pen1/4 "x 1" nut Bolt (
Size is not important)
1 "x 1" kitchen sponge foam cup "(
Or other static sources-
Balloons are also good)Infrared / non-
Contact Thermometer (optional)-
Most canon read to at least-28f-Cen-
Tech pocket thermometer for about $20 on ebay
Cheaper ones can produce unstable results. optional)-
CPU cooler used to verify power polarity/fault location radiator face up.
Apply a small amount of northern silver to the top of the radiator using a credit card or thin plastic.
Spread thin and evenly (
The thinner the better).
Cover an area of the same size as the peltier cooler.
Place the 12710 peltier cooler on top of the radiator.
Important: The Wire should be facing you and the red wire should be on your right.
This should ensure the location of peltier is cold.
Push peltier down.
Move a little to ensure good contact with the hot paste. First -
Please be sure to unplug the 12 v power!
Connect the fan and peltier power of the CPU cooler to the 12 v power supply.
Red is positive, black is negative.
Ignore any unused connections for the fan.
These steps need to be performed quickly!
If peltier connects back or reverses-
Unless it is disconnected, it will burn in a very short time. 1.
12 v power plug (
The fan should rotate)2.
Quickly touch the top of peltier (
Or measure it with a thermometer)3. Is it warm?
Unplug now! (
Is Peltier going backwards or backwards)4. Is it cold? Good! (
Unplug the power)
Apply a small amount of northern silver on the top of peltier that you have placed on the radiator.
Place another peltier (12709)
On an existing basis.
Push it down a bit to ensure good contact.
Important: The Wire should be facing you and the red wire should be on your right.
Connect the top peltier to a 5 v power supply (
Unplug the power).
The same exercise as before
These steps need to be performed quickly! 1.
5 v power plug 2.
Quickly touch the top of peltier (
Or measure it with a thermometer)3. Is it warm?
Unplug now! (
Is Peltier going backwards or backwards)4. Is it cold? Good! (
Unplug the power)
Plug in 5 v and 12 v.
Marvel at how cold the top peltier is!
If you have a thermometer
Hope it says18f or colder! If not -
Maybe something's wrong.
Or maybe it's just that your thermometer is not very accurate (this is common).
Unplug two power supplies.
If any condensate is formed on the top peltier-wipe it off.
Use Sharpie to clear-outside-
Bottom of plastic container.
This will help to show the steam trajectory more clearly.
Drill holes for bolts at the top of the container.
Poke a small hole in the sponge with a pencil.
Connect the sponge to the inner top of the container using nuts and bolts.
Don't worry about the imperfect seal.
A small leak at the top of the room does not hurt performance.
Apply the northern silver to the top of the top peltier. This time -
Apply it fairly freely.
Sufficient use to maintain good contact with the bottom of the container (
Such as the text proposed, any imperfect accounting). Yes -
Usually it is better to use less hot paste
But this is an exception.
This is probably where you have to run to the Radio Shack to buy another arctic silver tube.
Place the container on the peltier at the top. Push it down -
Squeeze around a little bit.
If it doesn't seem to have a good connection
Try adding more northern silver.
Try to make a tight seal
You don't want condensation between the container and peltier.
Plug in two power supplies.
The bottom of the container should be available in a few minutes.
If you have a thermometer
Hope it says14f or better! (
Don't worry if the whole surface doesn't read this cold one. )If so -
Your Cloud Room is available now!
If you don't catch a cold :-
Don't have too much confidence in your thermometer
If you're obviously below 0f-
It might make sense to go ahead and see if things work-
This article originally suggested Tec1-
Top and bottom of 12709-
This will work.
But using Tec1-
The bottom 12710 is better.
If you're using twoTec1-
12709, the result is not good-
You might want to turn off the bottom with CP1-12710. -
Check your hot paste app-
This is probably the most common problem.
The layer between Peltiers and the radiator should be very thin.
The last layer between the top peltier and the Chamber may need to be quite thick for good contact.
As a last resort
You may find that all hot paste is removed using alcoholand then re-
The application solved the problem. -
Are the Peltier coolers and containers all concentrated in the middle of the radiator? -
Is your radiator a little hot? If so -
Maybe not good enough. -
If your radiator gets warmer
One option is to remove the fan-
And put it in a cold water container (
Even with ice).
This will provide very effective cooling
At least before the water gets warmer. -
Verify that your electrical connection is good (
The warm wires indicate they are too thin). -
Try applying a small amount of weight/pressure on the top of the chamber-
This may help narrow any gap in the hot paste. -Re-
Test peltiers.
You can also use a multimeter to check against its specified resistance value (
They should not read anything higher than 4 ohms). -
Try to wait a few hours
Some hot paste will "set" and placing radioactive samples in the cloud room will become more conductive over time.
Add about 1 teaspoon of alcohol to the sponge.
Put the top on the container.
Plug in both power supplies.
Hold an LED flashlight behind the room.
In a minute or two, you should be able to see fine fog covering about 1/8 on the bottom of the container.
Try changing your viewing angle/flashlight position to see the fog best.
Wipe the foam plastic cup (
Or static things like balloons)in your hair -
Then put it on the container. Within 2-10 minutes -
You should start seeing steam marks from the radiation!
Important: "charging" foam plastic cup/balloon (
Rub it on your hair)periodically.
Try removing it/repositioning it to see what provides the best visibility of the radiation trajectory.
This is the key to being able to see alpha particles!
If you can't see the trail
Revisit the troubleshoot section in Step 16.
Performance may improve as things cool down.
Important: check regularly to ensure that the peltiers/chamber does not slide from the center of the radiator (this is bad).
If this happens, please reposition them gently.
No radiation sources-
You can see cosmic rays every few minutes.
Be sure to try this!
Get help/share your cloud room with others and run the cloud room as much as possible with the top slightly closed (
Or there's a hole in it)
Watch directly.
This is great for taking photos and videos.
If you don't find a clue
Or they seem to disappear soon. try re-
Application static source (
Foam plastic cups, etc)
As described in the previous step.
This is the key to achieving good results!
If you like to play high voltage games
You can try to connect the 1kv or higher DC power supply to the screw on the top of the chamber.
This will provide the same ion
Liquidation/performance-
Enhanced effect of foam plastic cup
But it's much cooler because the voltage is too high.
If too much alcohol builds up at the bottom of the container
Can hurt performance (
Suck it dry with a paper towel).
If your sample gets wet with alcohol
Some radiation will be blocked (again -
Paper towels can solve this problem).
This is a very common problem for small amer samples.
Rubbing alcohol on a sponge should last for a long time
But if you don't see any more marks
It may be time to add more.
If you only see traces/fog in a small part of the container-
You may want to try to apply more hot paste between the container and the top peltier.
Other directional light sources except LEDs (Like a spotlight.
It can also provide good lighting effect.
Standard incandescent or fluorescent bulbs can even work at certain angles (
Especially in table lamps or other fixtures)-experiment!
Increase viewing contrast-black out the -inside-
Container with black permanent mark.
The downside to this is that eventually alcohol will dissolve the ink.
It's a mess.
Depending on many variables, you may find that increasing/lowering the voltage of either cooler can improve the result. However -do -not-
Try running the top peltier with 12 v instead of 5 v. It won't work (
Not very good at least)-trust me. (
The quick explanation is that each peltier needs to pump out all the heat pumped out by one of the pumps on it --plus-
Any heat generated by peltier itself.
Because peltiers are not efficient-
This head adds up quickly.
Became a problem.
Trying to stack two peltiers running at the same total power level will result in-less-
Cooling at the same power is better than a single peltier. )
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