the rutgers 12” cyclotron the pursuit of resonance!
Post on 30-Jan-2016
227 views
TRANSCRIPT
![Page 1: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/1.jpg)
The Rutgers 12” Cyclotron
The Pursuit of Resonance!
![Page 2: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/2.jpg)
Where Hydrogen gas is inserted and ionized
![Page 3: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/3.jpg)
Where Hydrogen gas is inserted and ionized
Primary Source of Capacitance in Cyclotron
![Page 4: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/4.jpg)
Where Hydrogen gas is inserted and ionized
Primary Source of Capacitance in Cyclotron
This is the inductor used to turn the cyclotron into an LRC circuit
Tim wound it from a refrigerator coil!
![Page 5: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/5.jpg)
Our Problem:
•During the Cyclotron’s normal operation, its resonance frequency changes on its own
![Page 6: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/6.jpg)
Our Problem:
•During the Cyclotron’s normal operation, its resonance frequency changes on its own
Our Solution:
•Build an adjustable capacitor plate that responds to the changing resonant frequency of the cyclotron and behaves appropriately
![Page 7: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/7.jpg)
Implementation:Takes signal from signal generator and output of cyclotron and send it through a mixer
For our purposes, the mixer takes the two inputs and converts them to a positive or negative DC voltage depending on the phases of the inputs
![Page 8: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/8.jpg)
Implementation:Takes signal from signal generator and output of cyclotron and send it through a mixer
Put signal through H-bridge and switch logic, which are in turn connected to…
H-Bridge Switching Logic
![Page 9: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/9.jpg)
Implementation:Takes signal from signal generator and output of cyclotron and send it through a mixer
Put signal through H-bridge and switch logic, which are in turn connected to…
H-Bridge Switching Logic
LM 311Comparators
PNP trans.
NPN trans.
![Page 10: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/10.jpg)
Implementation:Takes signal from signal generator and output of cyclotron and send it through a mixer
Put signal through H-bridge and switch logic, which are in turn connected to…
H-Bridge Switching LogicThe And Gates
The Switches
![Page 11: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/11.jpg)
Implementation:Takes signal from signal generator and output of cyclotron and send it through a mixer
Put signal through H-bridge and switch logic, which are in turn connected to…an adjustable capacitor plate whose distance from the high voltage is governed by an electric motor
![Page 12: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/12.jpg)
A second idea for the adjustable Capacitor plate
![Page 13: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/13.jpg)
A second idea for the adjustable Capacitor plate
Pros:
Greater adjustable range of resonant frequency, around 70 kHz of play vs. 20 kHz with the single plate only
![Page 14: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/14.jpg)
A second idea for the adjustable Capacitor plate
Pros:
Greater adjustable range of resonant frequency, around 70 kHz of play vs. 20 kHz with the single plate only
Cons:
oThe additional plate causes a shift in the cyclotron’s resonant frequency
![Page 15: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/15.jpg)
•Turns out this doesn’t matter, so we decided to go with the second idea
•Unfortunately we were not able to get that far
![Page 16: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/16.jpg)
Here’s a summary of how things should’ve gone:The signal applied across the cyclotron and the output of the cyclotron are compared in a device called a mixer
The mixer sends either a positive, negative, or zero DC volt signal into our H-bridge/switching logic depending on the relative phases of the two input signals
The positive or negative voltage either withdrawal or extend an adjustable capacitor plate. The response of the adjustable plate is designed to respond in a manner that automatically corrects the change in the cyclotron’s resonant frequency
After installation of the equipment and some testing, the unit is meant to be left alone, operating on the feedback of the cyclotron
![Page 17: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/17.jpg)
Where did we get stuck?
H-Bridge Switching Logic
Anthony and I were unable to integrate the switching logic and the H-bridge
![Page 18: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/18.jpg)
It turns out that these little devices are a pain(!!).
LM 311 Comparators
![Page 19: The Rutgers 12” Cyclotron The Pursuit of Resonance!](https://reader035.vdocuments.net/reader035/viewer/2022062410/56649d585503460f94a37aad/html5/thumbnails/19.jpg)
But we both sure learned a lot and enjoyed our experience!