CRYO Path Forward April 6, 2020 Presented by: Gunther Haller - - PowerPoint PPT Presentation

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

• Just 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