BUFFER
GAS
TRAP
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Conventional positron sources (i.e. positrons from electron accelerators and radioactive sources that have been "moderated" using tungsten foils or solid neon) are typically fairly weak and have large energy spreads (e.g. from 0.2 to 2 eV). This has made positron experiments both difficult and time consuming, particularly at low values of positron energy. Our group has developed methods of trapping, cooling and storing positrons which allows much better beam brightness and energy resolution than has been possible previously. These techniques provide new potential opportunities for research and technological applications. Currently, we have achieved this using a Buffer Gas Trap. |
HIGH
FIELD
TRAP
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We have constructed a separate UHV trap in a 5T field provided by a superconducting magnet. The 5T field enhances plasma cooling by cyclotron radiation and, in conjunction with a rotating electric field, allows much greater compression of a trapped nonneutral plasma than is currently possible in our buffer gas trap. Ultimately, we would like to feed this trap with positrons from the buffer gas trap. However, there are many interesting experiments that can and have been done with electrons. To learn more about our high field trap research, click here. |
Papers about positron trapping and extraction as well as related papers about our plasma research.