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2.2 Detector and Electronics Wisniewski, Stroynowski

2.2 Detector and Electronics Wisniewski, Stroynowski. Does the conceptual design and planned implementation satisfy the performance specifications required to meet the project objectives? Yes.

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2.2 Detector and Electronics Wisniewski, Stroynowski

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  1. 2.2 Detector and ElectronicsWisniewski, Stroynowski • Does the conceptual design and planned implementation satisfy the performance specifications required to meet the project objectives? Yes. • Is the DOE project scope well defined within the DOE and NSF funded collaboration? Are all the other parts of the project understood to be the responsibility of the other collaborators? The TPC system, WBS 1.4, and the Electronics/DAQ system, WBS 1.5, have subtasks that are funded by both the DOE Project and NSF grants. The PMT system, WBS 1.8, is funded by an NSF grant. The subtasks funded by DOE and NSF are clearly delineated in both WBS 1.4 and 1.5 6. Is the documentation required by DOE O413.3A in order and ready for approval of the Critical Decision 1? Yes.

  2. 2.2 Detector and ElectronicsWisniewski, Stroynowski WBS 1.4 – Time Projection Chamber: Findings The Time Projection Chamber (TPC) task includes detector design and construction of components and assemblies; development and production of on-detector electronics; design and construction of the TPC and HV feed-throughs; procurement of cabling and power supplies; and documentation of the design, prototyping and construction. There is a large team from BNL, Yale, and UCLA to build the ~8200 wire TPC and its services. Prototyping is under way. Design and prototyping are documented, with notes stored in the database. Cost estimates and schedule are documented in Bases Of Estimate (BOE). Milestones have been developed. The risk assessment process has begun. A work plan has been developed for the period leading up to CD-2 that includes continued cost and schedule development, continued design effort and documentation, risk assessment development, and first prototype development of on-detector electronics. 2

  3. 2.2 Detector and ElectronicsWisniewski, Stroynowski WBS 1.4 – Time Projection Chamber: Comments Material testing relies on the experience gained by other experiments. There are plans for extensive testing. The team is encouraged to move forward rapidly in evaluating materials for LAr contamination potential. Design choices have been backed up in the document database. Selection of the TPC wire is an example of successful optimization. This choice, along with the technique used to secure the wire to the frame, makes wire breakage unlikely. A wire winding machine has been designed. This will simplify this task, limiting handling to transfer of the wire. Feed-throughs are a potential trouble spot. Costs estimates, based on the experience of detectors with a larger number of feed-throughs, should take proper account of set-up costs. The team is encouraged to maintain ample contingency for this item. Two rounds of prototypes for the on-detector electronics are included in the schedule. This is a commendable practice. The assembly of the detector system takes place at Fermilab. Surprisingly, this assembly of the components into a single installable device is not part of the TPC task (WBS 1.4). It appears in the Installation (WBS 1.7) 3

  4. 2.2 Detector and ElectronicsWisniewski, Stroynowski WBS 1.4 – Time Projection Chamber: Comments (cont’d) The BOEs have been developed for detector components, and include detailed estimates of costs and analysis of labor needed. Back-up quotes are available in some cases. The contingency rules, which have ranges for estimator’s judgement, appear to be reasonable. Contingency estimates are given for the cost estimates; however, more extensive details of the argument for the contingency estimate should be included in the BOEs before CD-2. Contingency has not been explicitly called out for the NSF tasks. However, the grants have some ability to deal with cost overruns. The TPC relies on students, both graduate and undergraduate, as a key component of the construction workforce. Care must be exercised to avoid over-counting their effort. The team needs to extend the Risk Assessments which it has already begun, expanding the risk set to include more unlikely scenarios. The TPC team has made good progress toward readiness for CD-2. This subsystem is ready for CD-1 approval. WBS 1.4 – TPC: Recommendations None. 4

  5. 2.2 Detector and ElectronicsWisniewski, Stroynowski WBS 1.8 – PMT: Findings The PMT task includes design, procurement or construction of the photomultiplier (PMT) tubes (spec’d for cryogenic use), associated detector elements located inside the cryostat, mechanical support of the detector elements, cabling to connect the detectors to the readout, and documentation of the design, prototyping and construction. This system is off-project, with funding from NSF alone. The system takes advantage of the yield of scintillation light available from LAr, using the fast component for event triggering. Because of the short wavelength of the scintillation, wavelength shifter (WLS) will be used to match the sensitivity of the photocathode. The WLS has been selected. It will be used to coat a plate in front of the phototube. Investigations of the best way to coat the plate continue, with completion anticipated before CD-2. All components will be tested for effects on LAr purity. All PMTs will be tested in LN2. There will also be tests of PMTs with WLS coated plate in LAr. About half of the PMTs will be cold tested before CD-2. Design and prototyping are documented, with notes stored in the database. BOEs have been prepared on costs and schedule, with particular application to schedule, since 30 of the PMTs, the cost driver, have been ordered. 5

  6. 2.2 Detector and ElectronicsWisniewski, Stroynowski WBS 1.8 – PMT: Comments The PMT system effort is quite mature. Grant funding for the PMT system will be exhausted if it is determined that an additional 15 PMTs are to be bought (system needs 30 total). There are other resources that may be brought to bear to cover limited cost overruns (MRI cost sharing funds). A well reasoned, robust design using the WLS on a plate separate from the PMT has been developed. The team is encouraged to move forward rapidly in evaluating materials for LAr contamination potential. The system depends heavily on student and faculty effort. Times of high activity are centered on the summer break. The team is encouraged to evaluate if there is risk associated with this work pattern. The team has identified a very experienced engineer for design of the support structure for the PMTs. The team should evaluate the risk to the project due to his availability. The assembly of the detector system takes place at Fermilab. This assembly of the components into a single installable device is not part of the PMT task. The team needs to extend the Risk Assessments which it has already begun. The PMTsubsystem is ready for CD-1 approval. WBS 1.8 – PMT: Recommendations None 6

  7. 2.2 Detector and ElectronicsWisniewski, Stroynowski WBS 1.5 – Electronics and DAQ: Findings There are 8256 preamplifiers located on ~129 boards situated on top of the wire TPC frame. Differential signals are transmitted through 11 feed-throughs to intermediate amplifiers mounted on the pin carriers, and from there to the off-detector readout boards that provide digitization, formatting and data compression using FPGA technology. Calibration is provided by a set of boards located on the detector. Readout of 30 PMTs use modified FEM used for TPC signals. The DAQ system of 10 crates uses token passing system to pass signals to event builder and stream selection and eventual data storage. All connectors aside from the feed-through pin carriers are commercial off the shelf items. 7

  8. 2.2 Detector and ElectronicsWisniewski, Stroynowski WBS 1.5 – Electronics and DAQ: Comments The electronics design is conservative and based on successful prior applications of its elements. The number of spare components of 13% is sufficient to cover breakage, components failure and manufacturing problems. This allows 10% spare boards. It does not include various test stands and preproduction demonstration circuits. It would be useful to have a clear count of all major boards in a single table for CD-2. The length of the electronics production schedule is short and constrained by the completion of the final engineering design on one end and the start of the installation on the other end. The late start of engineering is an underlying culprit. The cost and schedule development is appropriate for the CD1 approval. Some fleshing out of details will be needed before the CD2 stage. 8

  9. 2.2 Detector and ElectronicsWisniewski, Stroynowski WBS 1.5 – Electronics and DAQ: Recommendations Revise the schedule to provide additional time for fabrication and testing of electronics by CD-2. 9

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