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Delayline Detector DLD6060-8S Manual
Delayline Detector DLD6060-8S Manual | Surface Concept GmbH
Note
It is not unusual that the operation voltage must be increased several times especially in
the first month of operation.
Typically, the final operation voltage at the end of the burn-in period will be close to the recommended
maximum operation voltage. An increase of the operation voltage above the recommended maximum
operation voltage is in principal possible and allowed, as long as there is no significant increase in the dark
count rate, bright spots at the detection area and/or appearance of high voltage sparking.
Figure 17: Schematic plot of increasing the operation voltage to compensate gain
degradation over time as function of the extracted charge (all values are only exemplary).
After an initial burn-in period, in which the detector gain changes as a result of electron induced chemical
allocation together with degassing residual gas molecules from the inside of the channels, the MCP
performance is very stable over a large amount of extracted output charge. The MCP gain is also a function
of the detector operation voltage. Therefore gain degradation can always be compensated by increasing
the detector voltage.
The delivery of a detector will happen with the MCPs operating within the burn-in period, although the
detector always undergoes an initial burn-in procedure with highest count rates during the test phase. Gain
degradation will be still significant in the first month of operation (or even longer, depending on applied
count rates) and becomes obvious by a decline of the detector performance. Therefore it will become
necessary evaluate the current operation voltage by measuring a so called MCP curve from time to time.
There is a recommended maximum operation voltage, to which the detector voltage can be increased to
compensate gain degradation over time. This voltage is given in the specification sheet of each detector.
A typical behavior of the detector voltage increase over time to compensate gain degradation is given
schematically in
