CRYO Path Forward April 6, 2020 Presented by: Gunther Haller Director, Advanced Instrumentation for Research Division Technology Innovation Directorate
Consortium agreed on a Downselect Process DUNE DocDB 6658 (12/17/2018) CRYO’s role is defined to be an “alternative” to baseline. NOT just a “risk mitigation” • “Testing Strategy and Decision Tree” treats 3-chip and CRYO completely symmetrically • “DUNE will plan for systems tests of the baseline and alternative options in both the CERN Cold Box and in the LArIAT cryostat with a small liquid argon TPC.” • Decision to be based on criteria defined by the consortium • Plan is for downselect to happen in February 2021
CRYO Technical Status Full all-in-one system functionality demonstrated in DUNE v1 (very first prototype) ● Performance agreed with simulations in almost all aspects ● Measured noise levels higher than simulated. However: Discrepancy due to system issues, such as test board layout. ○ New cold test board correcting layout noise issues is currently being fabricated at PCB factory ● A couple of minor technical issues were fixed in nEXO version 1 (front-end optimized for nEXO) ● Bench tests can start as soon as when PCB board is received First nEXO version 1 received from foundry in February 2020 (development and fabrication funded by nEXO) ● This version is optimized for nEXO ● Stepping stone towards next 2nd prototype DUNE Cryo ASIC, might be final version. ● Front-end in nEXO V1 optimized for nEXO low capacitance, but simulated noise is within 10% of DUNE-optimized version nEXO V1 is suitable for system test at FNAL ICEBERG ● In schedule for Summer 2020 2nd prototype optimized for DUNE (V2) is planned for system test on ProtoDUNE Cold Box (mainly cable driver and putting back DUNE amplifier, minor modification) ● 2nd DUNE Cryo V2 ASIC expected back from fabrication August 2020 ● Cold Box test in schedule for late fall 2020/early winter 2021 CRYO will be ready by the down-select date Feb 2021
Remaining work for the two options 3 ASIC type solution (amplifier, ADC, communication ASICs) • At least one more iteration is planned for each of the 3 ASICs • There is still a PCB to be implemented with all three types of ASIC mounted and tested: warm or cold - Functionality and performance of the three-ASIC system still needs to be shown • Initial tests from testing of LArASIC+ColdADC+FPGA (instead of COLDATA) on 40% APA reveal issues Cryo ASIC • J ust received nEXO V1 (also works for DUNE) - All three function blocks (amplifier, ADC, communication) has been shown to work in one ASIC - Noise performance to be tested (DUNE V1 had higher noise, but likely cause PCB, new PCB is in fabrication) - nEXO V1 ASIC (in bench testing this month) will be tested in ICEBERG - Demonstration of cold noise and system performance already before DUNE V2 - Opportunity to demonstrate complete system performance in TPC environment planned for Summer 2020 - The Feb-2020 review comment that 3-ASIC solution is further ahead is not an accurate assessment of the situation in our view, in fact the Cryo ASIC is much closer to having a complete system running on a board DUNE Cryo ASIC path forward is simpler, shorter, cheaper, and lower risk (which will be retired with ICEBERG test) ○ All three system blocks already working together (in one ASIC) ○ Iteration of only one ASIC (DUNE V2), versus 3 different types
Considerations for future budget impact to DUNE project Remaining cost for DUNE project will be lower for single ASIC solution • Prototyping and Production - Single ASIC effort for further iterations, ASIC costs, design and testing labor will be less than for a 3-ASIC solution - Final board design and system testing will be less complex in the single ASIC system
Sharing of Schematics: Will be solved ● DUNE requested to have the schematic shared since DUNE pays for the design ● SLAC’s honoring of its NDA with TSMC has up to now prevented sharing of schematics ● SLAC legal has been looking into how to mitigate this ● We are confident to resolve this ● Possibly need to execute simple NDA’s between SLAC and collaborators ○ Work in process
Additional SLAC physicist to work on DUNE: Bill Wisniewski • Bill Wisniewski is planned to start working on DUNE • Concentrating on SLAC contribution on Cryo ASIC and related instrumentation • Bill has substantial experience in HEP detector instrumentation (Extensive project management experience, BaBar Technical Coordinator, LZ, etc) • Bill just came off the LBNF-DUNE detailee assignment at DOE Headquarters March 30 • Could not start before for obvious reasons • Very positive addition for DUNE in many ways
Path Forward: Recognizing and help mitigating DUNE’s budget problems DUNE plans to support testing of nEXO version 1 which was just received (main items) • Coordinated with Nuclear Physics to share development and testing - Bench test • ICEBERG test - Hawaii FEMB fabrication - WIB firmware (BNL, Penn,...) To complete the remaining work required for the down-selection: • SLAC will internally support development, fabrication and bench test of Cryo DUNE V2, tailored prototype in preparation for ProtoDUNE Cold Box test • No cost to DUNE to develop, fabricate, bench test optimized Cryo DUNE V2 prototype ASIC
Consortium agreed on a Downselect Process DUNE DocDB 6658 (12/17/2018) There is no justification to modify the Downselect process that was agreed to by all parties • SLAC’s contribution relieves budget pressure • DOE and SLAC have invested substantial funds and the cost to go to down-select is small compared to the investment • Engineers have put in substantial effort based on agreement
Conclusion ● Cryo ASIC development on track and large likelihood that Cryo DUNE V2, tailored to DUNE, will meet requirements ● Cryo schematics on path to be shared between collaborators ● Clear potential benefits to DUNE of single integrated version ASIC: Lower future project cost (only one type of ASIC to produce and test, board simpler, etc) ● Addition of experienced physicist Bill Wisniewski on Cryo, just coming off being the LBNF-DUNE detailee at DOE ● All cost for development, fabrication, and bench testing of Cryo DUNE V2 will be contributed by SLAC All concerns have been addressed and it is vital that the agreed down-select process be followed with both solutions on equal footing
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