A multi-wire chamber with a pair of electric slit wire planes

Abstract

A multi-wire chamber with a narrower anode wire pitch has higher space resolution in radiation measurements. In some cases, narrower pitch is quite useful; however, higher electric potential on the anode wires is necessary in inverse proportion to the pitch width. This is disadvantageous viewed from design and construction. The new wire plane, which works as a pair of electric slits, is attached in parallel with the anode wire plane in a popular chamber (pitch of p=3mm, relatively lower anode wire potential). By operating these electric slits, we can virtually divide the anode wire pitch into 3 regions. It was possible to obtain the information from each region by a particles. Then, we could complete the whole picture of the object, superposing them on the screen. The image of a thin small spanner (wrench) as an example shows that the new chamber works at a low anode wire potential corresponding to p=3mm, equivalent to the anode wire pitch of a p=1mm. This technique is applicable widely to design and construct chambers for precise resolution at low anode wire potential.