RoentDek can equip a DET40 (40mm MCP, other detection sizes possible) with custom-made phosphor screens for combining single particle counting/timing with optical read-out. Again, easy handling, modularity, flexibility and high performance for scientific application guide the mechanical concept in order to surpass the “industrial-grade” standard devices’ performance.
Also, there is a special type of transparent timing anode that allows placing custom read-out circuits behind the detector, either in vacuum or, in combination with a RS-DET40/75, right on air-side of a flange-mounted detector.
Timing electronic schemes:
For all MCP timing detector applications RoentDek supplies the same type of FT4TP feedthrough assembly (with or without mounting device) which takes care of high voltage input (e.g. from HV2/4-type supplies) and signal decoupling for output to electronic recording devices. Depending on the actual application there is a choice of read-out electronics:
For “simple” counting applications at quasi-continuous rates up to 2 MHz and with no or only modest temporal resolution demand, the LET1+ is an economic solution. It provides a digital output signal (NIM or TTL) for counters like the RoentDek RM6 or TDC timing devices.
If high temporal resolution (down to 100 ps FWHM) is required a combination of FAMP1+ and CFD1 is appropriate, followed by a high precision TDC (e.g. the TDC4HM or TDC8HP). Even higher temporal resolution can be obtained by using a fast analog digitizer like the fADC4.
For bunched operation, i.e. whenever a large number of particles during a short period are to be detected, a combination of FAMP1+ and fADC4 is the optimal choice. This read-out scheme expands operation even to particle fluxes when several particles arrive simultaneously and individual signals overlap. This bridges the gap to the “current mode” of MCP when individual particle detection turns into recording of a fluctuating current.
The DET40P with phosphor screen:
offers the DET40 timing detector optionally with phosphor screen. Compared to "industrial-grade" MCP+screen assemblies RoentDek supplies devices for high-end scientific applications. This means that the MCP stack is of same quality and specs as employed for single particle counting and the screen is of selected quality with the choice of material. It does not need an aluminum cover so that decent light output is already achieved at comparably low bias. This makes handling, mounting and operation of the detector user-friendly (e.g., no excessive high voltage needed). The detector can be mounted anywhere inside the vacuum vessel as long as the screen can be viewed by a camera through a window. The assembly is modular, components can easily be replaced. It is possible to combine particle counting/timing with recording an image on the screen.