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MCP Delay Line (Version 6.2.90.5)
The X and Y positions can be calculated from any combination of these equations. If for a given event more signals than
from the minimum of two layers are available, it is recommended to choose signals from those two layers where the positions
are most distant from the respective delay line ends (and gaps).
Timing information:
In order to determine the time difference between an outer time marker and the particle impact, the signal at the MCP
contact can be used. But it is also possible to deduce the particle impact time from the delay-line signals:
If the MCP signal is used as the start of the TDCs, the “time sum” values
sumx = x1 + x2
sumy = y1 + y2
Equation 2.5
sumz = z1 + z2
are constant within the time resolution (less than one ns) for all positions. Thus it is also possible to deduce the particle
impact time from these time sum values. In order to achieve a high resolution one should take into account that the time sum
value on a layer varies slightly with the position on this layer in a fixed pattern. Please contact
RoentDek
for advice how to
incorporate that into the code.
Even if the particle timing is not of interest, the time sum values can be used to verify a proper detector function.
2.4
Assembly of the MCP-Detector
The assembly should take place under clean and dry conditions.
2.4.1
List of Detector Assembly Parts
•
ceramic rings, partially metal coated (for
DLD40
,
DLD80
and
HEX80
)
•
two multi-channel plates, selected for chevron configuration, matched in resistance
•
metal spring clamps (for
DLD40
,
DLD80
and
HEX80
)
•
plastic screws M3 with nuts (for
DLD40
,
DLD80
and
HEX80
only during assembly of the MCP holder)
•
1 delay-line anode
•
Assorted small parts for cable connections
You will usually receive the detectors pre-assembled. For
DLD40
,
DLD80
and
HEX80
the MCP holder with rear ceramic
ring is placed on the delay-line anode, it is fixed by the retractable “shields” in a position that should be resumed after
assembly of the MCP stack. Please observe the relative angle of the metallization structure and remount the MCP stack, after
assembly, so that the rear ceramic ring is in about the same orientation as before (shown in Figure 2.2).
Figure 2.2: Orientation of the rear ceramic ring on the Delay-line assembly (DLD40, DLD80 and HEX80)
*
For
DLD120
and
HEX120
: 6 Vespel M3 screws and 3 plastic M3 rods (only during assembly of the MCP holder)
Summary of Contents for DLD120
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