We tested our 2-D Detector in "negative charged particle mode". This is a spectra.



As you seen, this resolution was worse than "positive mode" (for example this).
In this situation, the count rates was higher, a factor of 3, than before.


And another problem exists. The signel from MCP-front has had ringing noise. In the following image, the yellow line is it.

This image was taken when MCP-back signal was grounded.


This image was taken by MCP-back signal was bypassed through Amplifer.