An electronic pepper pot

Peters, J.
April 1994
Review of Scientific Instruments;Apr94, Vol. 65 Issue 4, p1459
Academic Journal
An electronic pepper pot has been developed at DESY for analyzing the H[sup -] beam. It consists of a number of slits in front of a harp with a high wire density: Multiplexing of the harp signals is done in the vacuum. The number of slits and the distance between the harp and the slits can be varied according to the beam parameters. The first version consists of a harp with 484 wires which are 0.1 mm wide with a spacing of 0.1 mm. They are printed on a board. The storage and readout is done using three chips in the vacuum. External transfer of the analog signals is done with a few lines. One may measure the current distribution and the emittance within one shot of the beam and is free to choose the time for the sample. This is of special interest for.sources with a low repetition rate such as the HERA H[sup -] source. The present arrangement is only a first step. Further designs are discussed.


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