Radiation Assurance on COTS

2 – BUISNESS DOMAIN OF INTEREST TO USE COTS

Main impact is :

• No way to have an ‘universal’ Radiation Hardness Assurance” document for all domains

• We are not talking about the same problem

• Specific RHA have to be written per domain : 6 RHA

RADCOTS 2020 will show example of RHA for each domain, based on flight lesson learnt and/or design phase

The main impact on radiation qualification testing, engineering, analysis will be analyzed. Constraint to respect will be identified :

• space radiation environment specification,
• Radiation Design Margin Policy,
• RADLAT Criteria ( if any )
• System Dependability spec &  System Reliability Spec,

“ A New Way to Work for New Space “ rather than“An Old Way to work for New Space”

3 – CRITICAL POINTS FOR COTS vs RADIATION

For each application domain (c1, c2, c3, s1 & s2), which level of traceability is required for TID  & TNID ?

• If Mask# & Diffusion Lot (DF) are known, then ok

• If Mask# & DF is unknown :

• Try to find the information via CPPA, or others ?

• Implement a statistical approach, based on one Procurement Lot and reliability spec ?

• Open some parts to identify the Mask# ?

• Use as Is ?

For each application domain (c1, c2, c3, s1 & s2), which level of traceability is required for ND_SEE & D_SEE ?

• If Technology & Mask#  are known, then ok

• If Technology & Mask#  are unknown :

• Try to find the information via CPPA, or others ?

• Implement a statistical approach, based on one Procurement Lot and reliability spec ?

• Open some parts to identify the Technology & Mask# ?

• Use as Is ?

For each application domain (c1, c2, c3, s1 & s2), analyze :

Procurement strategy :

• Directly from the manufacturer ?

• distributor ?

One procurement for the whole constellation need ?

In case of no traceability information are available,

• which minimum of construction analysis to perform ?

• Layout ?   die marking ?

4. TEST METHODS AND STRATEGY FOR THE USE OF COTS

For each application domain (c1, c2, c3, s1 & s2), analyze :

• Increase the sample size, directly linked to reliability spec ?

• Pass/Fail criteria  for DES & NDSE directly linked to the environment, Dependability & Availability specs ?

• Testing at part level ?, board level ?, equipment Level ?
• Proton, ions, laser, …  ?
• Search for all possible phenomena : SFI, Stuck Bit, MBU …. ?

• Complex parts : part validation only in the application ?

• How to prepare the DUT provided in plastic package, BGA, … ?

5 – RHA FOR THE USE OF COTS

For each application domain, how to  specify the environment ? :

• Use the worst and theoretical radiation models with high uncertainty margin ?

• Use “pragmatic” models based on lesson learnt flight data over the last decades ?

• Don’t specify anything ?

For each application domain, how to  calculate TID & TNID ? :

• Perform accurate 3D radiation models and perform 3D Ray Tracing calculations an 3D Monte Carlo on critical parts ?

• Determine, at satellite level, a worst case TIDL level, that all parts from any equipment, have to withstand ?

• Don’t calculate anything ?

To perform TID qualification of purchase lot ?

• large sample size n

• One-Side Tolerance Limit : KTL

• Ppost-rad = <p>+/- KTL* s with KTL = f ( n ; Q ; CL )

• with Q = tbd  & CL =tbd / N =30? 40? 50? …. tbd

• To be determined in agreement with SDF at system level

To validate in its application ?

To validate with the data sheet ?

Don’t do anything ?

To perform Non Destructive_SEE qualification

• Qualification of the part in its application  ? (criticity & effect)
• Accurate Testing for accurate risk assessment ? (rate)

• • Accelerators ( ion, proton)

• • Alternative source ( laser, ….)

• To get a maximum outage rate from the system, for validation ?

• To consider a “worst case” ND_SEE rate to apply at any part ?

• Don’t do anything ?

To perform Destructive_SEE qualification

• Simplify the requirement in term of maximum λ rate, from the system, then translate into LETcritical from environment spec ?

• • Simplify the heavy ion qualification : pass/fail

• Accept proton induced D_SEE ?

• Integrate detection/circumvention circuitry “a priori”

• • validation under beam

• Don’t do anything

RADCOTS 2020 will describe RHA for each domain

1 – COTS DEFINITION vs RADIATION EFFECTS

RADCOTS 2020 will present views of :

• Agencies, Prime Contractors

• Equipment manufacturers

• Components suppliers , Central Parts Procurement Agencies

• Universities

Round table discussion will be organized in // sessions

Wrapu-up & Recommandations

RADCOTS 2020 – CONCLUSION

RADECS ASSOCIATION

RADECS 2020 COMMITTEE

RADCOTS 2020 Committee

is waiting for you, in Vannes,

to attend RADCOTS  2020

&

September 14th, 2020

Vannes – Morbihan Brittany – France

www.radecs2020.org/radcots

RADCOTS 2020

RADECS 2020 – CONCLUSION