A large open ratio, time and position sensitive detector for time of flight measurements in UHV

TL;DR

This paper presents a UHV-compatible, high-precision detector for time-of-flight measurements, featuring a large open ratio, position sensitivity, and improved timing accuracy suitable for ultra-high vacuum applications.

Contribution

It introduces a novel detector design with direct assembly on feed-throughs, charge division readout, and empirical aberration correction for enhanced accuracy and timing in UHV conditions.

Findings

Achieved 500 μm absolute positioning accuracy.

Measured 150 μm resolution at the center.

Demonstrated excellent noise immunity and timing performance.

Abstract

We report on the construction of a UHV compatible 40 mm active diameter detector based on micro channel plates and assembled directly on the feed-throughs of a DN63CF flange. It is based on the charge division technique and uses a standard two inch Si wafer as a collector. The front end electronic is placed directly on the air side of the flange allowing excellent immunity to noise and a very good timing signal with reduced ringing. The important aberrations are corrected empirically providing and absolute positioning accuracy of 500 $\mu$m while a 150 $\mu$m resolution is measured in the center.