NeuLAND - FAIR

Figure 5.11.: Shown is a fully assembled read-out chain, as currently in use for LAND:
on the left hand side, the TRIPLEX board on top of the frontend card,
in the middle the TacQuila main board with the QDC piggy-back, and on
the right hand side the connection for low-voltage supply.
For the implementation of TacQuila for NeuLAND two major further developments are
underway. First, the TAC stage shall be replaced by a high-resolution Time-to-Digital
Converter (TDC) [Bay-10] in a Field-Programmable-Gate-Array (FPGA). By that, we
overcome the limited availability of dedicated TAC-ASICs.
Second, the layout of the NeuLAND double-planes demands the read-out of 200 signals
in 4 corners of the frame structure. Thus an upgrade of the TacQuila board from
currently 16 to 50 channels is envisaged, in order to fulfill the space constraints, see
figure 5.10.
5.4.2. High-Voltage Distribution System
For NeuLAND 6000 photomultiplier need to be supplied with high voltages of typically
1 to 2 kV, with a maximum current of 2-3 mA per channel. For the first NeuLAND
submodules, conventional high voltage (HV) supplies are used, i.e. a Multichannel Power
Supply System SY1527, CAEN 1 , similarly to the supply of the existing LAND detector.
For the full detector solution, an optimized solution is under development, namely a HV
1 http://www.caen.it/csite/CaenProd.jsp?parent=20&idmod=122
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