|
Weizmann Institute of Science Faculty of Physics |
|
|
Contact Information Tel : 972-8-9343458
Secretariat: |
Current Research Interests For the last two decades I have mainly worked in the field of high density plasmas and high intensity ion and electron beams. Devealoping diagnostic methods has been my favourite. One method of measuring properties of plasmas with little interference is observing how a beam traversing a plasma is modified by it. Usually, a light beam is used as a diagnostic tool but for some measurements a beam of charged particles can yield information which cannot be obtained with light. In the past, we have used a proton beam to investigate the behaviour of transient potential wells which collectively accelerate ions to high velocities. The phenomenon occurs in a very short time - 10 nanoseconds - and the measurement has to be done within that time. Electron beams could yield complementary
information. For that purpose, a high
intensity, low angular divergence (low emittance)
beam is needed. Such beams can be produced
from photocathodes. However, most photocathodes quickly
deteriorate even in respectable high vacua. They
require ultra high vacuum to ensure
adequate lifetime. A practical diagnostic tool must work in more modest vacua usually
encountered in plasma experiments. Recently,
we have started to develop a photocathode that may satisfy this requirement. Initial results are encouraging
and we plan to continue this work in
the near future.
|
||||
|
Homepage |
|
||||
|
Publications |
|
