NuMi Off-Axis Neutrino Appearance - NOVA Document Database ...
NuMi Off-Axis Neutrino Appearance - NOVA Document Database ...
NuMi Off-Axis Neutrino Appearance - NOVA Document Database ...
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2.3.2 Comments<br />
The Electronics and DAQ individuals working on NOνA are very experienced and the<br />
technical challenges are considered to be well within the capabilities of the group.<br />
The designs presented for the front-end electronics and the DAQ system provide<br />
sufficient throughput and flexibility to meet the (scientific) requirements of the NOνA<br />
experiment. No technical hindrance was identified.<br />
The APDs are single-vendor sourced (Hamamatsu). However, this is not unusual for<br />
silicon detector devices for high energy physics and is not a high risk. Hamamatsu has already<br />
redesigned their APDs to fit the NOνA design. If another iteration is required due to NOνAdriven<br />
modifications, a new mask set (at a cost of about $200K) would be needed.<br />
The ASIC is not considered a technical risk, but could impact the schedule if additional<br />
iterations are required. However, this is not considered very likely since the performance and<br />
complexity seems to be well within the capabilities of the design team.<br />
The noise performance required appears achievable and digital processing can improve<br />
the result if required.<br />
In general, it unclear what are the reliability requirements for the 20,000 electronics<br />
packages are (i.e., How many packages can be non-functional before they need to be replaced?).<br />
The requirements should be provided by systems engineering. All electronics are accessible,<br />
thus it is a mainly a question of maintenance efforts.<br />
The high-voltage supplies can source currents up to 15 mA per channel. The safety<br />
measures required for inclusion in the design of the high-voltage distribution system needs<br />
clarification.<br />
For the Near Detector, the project should illustrate that the probability of over-lapping<br />
signals in a detector element is negligible or effort needs to be budgeted to modify the front-end<br />
electronics boards for the Near Detector.<br />
Electronics calibration also needs to be defined in more detail and related software<br />
should be included in the plan. The DAQ system provides sufficient throughput and flexibility<br />
to meet the requirements.<br />
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