FREEMAN ION SOURCE Design and Optimization for Increased Beam Density

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In summary, the conversation is about the search for information on Freeman Ion Sources for a BS thesis. The person is looking for help with the material and sizes of the source in order to design it for better beam density. They mention a textbook on Ion Sources, specifically the Freeman and Bernas sources, and express difficulty in finding information on the best length of filament, distance between chamber and filament, and the best element to use in the arc chamber. They are grateful for any assistance.
  • #1
david allen
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Hi
I am searching on freeman ION SOURCE for my BS thesis. I have lots of problem about the material of the FREEMAN ION SOURCE and sizes of all the part to have the best design and better beam density. I need some details. Any help would be appreciated.
 
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  • #2
There are several textbooks on Ion Sources, but they tend to be rather expensive.
8. Freeman and Bernas Ion Sources (Marvin Farley, Peter Rose, and Geoffrey Ryding).

8.1 Introduction.

8.2 The Freeman Ion Source.

8.3 The Bernas Ion Source.

8.4 Further Discussion of the Source Plasma.
8.4.1 Plasma and Sheath Potentials.
8.4.2 Effect of Sputtering on the Plasma.
8.4.3 Ion Heating of the Cathode and Anticathode in the Bernas Source.
8.4.4 Current Balance in the Freeman Source.
8.4.5 Current Balance in the Bernas Source.

8.5 Control Systems.
8.5.1 Freeman and Bernas Controls.
8.5.2 Bernas Indirectly Heated Cathode.

8.6 Lifetime and Maintenance Issues.
8.6.1 Use of BF3.
8.6.2 Use of PH3, AsH3, P4, and As4.
8.6.3 Use of Sb, Sb2O3, and SbF3.
8.6.4 Use of SiF4 and GeF4.
8.6.5 General Guidelines for the Use of Other Organic and Inorganic Compounds.
8.6.6 Electrode Cleaning and Maintenance.
8.6.7 Insulator Cleaning and Maintenance.
from The Physics and Technology of Ion Sources, 2nd, Revised and Extended Edition, Ian G. Brown (Editor), Wiley, October 2004 - US$300
http://www.wiley.com/WileyCDA/WileyTitle/productCd-3527404104,descCd-tableOfContents.html

Sample from text - http://books.google.com/books?id=jOlKdGPBpD0C&pg=PA134&

Paper - "Ion Sources For Commercial Ion lmplanter Applications" mentions Freeman sources
http://accelconf.web.cern.ch/accelconf/p91/PDF/PAC1991_2088.PDF
 
  • #3
I really appreciate for your replay. I have got this book that is great but it did not mention for sort of details such as what is the best length of FILAMENT or the best distance between chamber and filament and the best element for using in arc chamber.
thank you
 

Related to FREEMAN ION SOURCE Design and Optimization for Increased Beam Density

1. What is a FREEMAN ION Source?

A FREEMAN ION Source is a type of ion source used in mass spectrometry, which is a technique used to separate and analyze ions based on their mass-to-charge ratio. It is named after its inventor, Frank William Freeman, and is commonly used in combination with quadrupole mass spectrometers.

2. How does a FREEMAN ION Source work?

The FREEMAN ION Source works by using a heated metal filament to produce a beam of ions. These ions are then accelerated by an electric field and focused into a beam using a series of electrodes. The ions are then separated based on their mass-to-charge ratio as they pass through a quadrupole mass filter.

3. What are the advantages of using a FREEMAN ION Source?

One of the main advantages of a FREEMAN ION Source is its ability to produce a high-intensity ion beam, which is useful for analyzing small samples or trace amounts of compounds. It also has a relatively simple design and is less expensive than other types of ion sources.

4. What types of ions can be produced by a FREEMAN ION Source?

A FREEMAN ION Source can produce a wide range of ions, including positive ions (such as hydrogen, helium, and argon) and negative ions (such as oxygen and chlorine). It can also produce multiply charged ions, which are useful for analyzing larger molecules.

5. How is a FREEMAN ION Source maintained?

To maintain a FREEMAN ION Source, the metal filament must be periodically replaced when it becomes worn or damaged. The electrodes and other components should also be regularly cleaned and checked for any signs of wear or malfunction. It is important to follow the manufacturer's guidelines for maintenance and use to ensure optimal performance of the ion source.

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