SOW for Micron Semiconductor LLC 8 13 20 4200731595.doc

STATEMENT OF WORK FORMAT

Solid-state detectors for the Miniaturized Electron Proton Telescope on the Lunar Gateway (HERMES) mission.

Background

The cis-lunar Gateway platform provides the opportunity for heliophysics investigations to advance our knowledge of the coupled Sun-Earth system and the opportunity better understand the radiation environment in order to support and improve crew safety and operations at the Moon and beyond.

MERIT (Miniaturized Electron Proton Telescope) has been selected by NASA HQ to fly on the Lunar gateway. MERIT is a particle telescope that uses a stack of solid-state detectors (SSD). These SSDs used will also be identical to the MERIT instrument on CeREs, and CUSP CubeSats and the REPT instrument on NASA’s flagship mission Van Allen Probes.

Scope

Micron Semiconductors, UK shall deliver 40 SSD detectors to NASA GSFC which are designated MSD040 DT/RBSP-1500 and have flown on the REPT/Van Allen Probes.

Requirements

The SSD requirements are given by the following specifications:

SILICON:

Float Zone

Orientation: <100>

Dopant: N Type (phosphorus)

Resistivity: 30,000 ohm-cm typical

Resistivity range: 25000-ohm – cm 35000 ohm – cm

Diameter: 100 +/- 0.5 mm (4 inch)

Primary orientation FLAT 32.5mm +/- 2.5 mm

Thickness: 1500 micron +/1 25 micron

Total thickness variation (TTV) +/- 2 microns

Bow 2 microns typical

Finish: Double sided polished (Virginia, USA)

Crystal growing: Topsil Denmark

Cut to ingots: Topsil Denmark

Etched/ lapped: Taiwan Asia

Finish required: defect free excluding outer 5mm viewed x 10 magnification. Free of scratches/ hillocks

Edge: Rounded with no cuts or lesions

DETECTOR SPECIFICATION:

Part designation: MSD040 DT/ RBSP-1500

Design: Ion implanted Multiguard / Field Plate Structure

Single Active Area 12.5cm2

Active diameter: 40mm

Window Type: 2M (<1 micron) both faces

Detector thickness: 1500 micron +/- 25 micron

Packaging: PCB stacks in pairs

Connector: TBA based on delivery timescales

Full depletion (FD) 250 +/- 50 volts subject to silicon selected post processing

Operating voltage FD to FD + 30V (FD + 15V typical)

Capacitance (FD) 100pF typical

Leakage Current (FD + 30V) 2uA typical 3uA maximum

Forward voltage (10mA) 0.8 volts maximum

Multi guard ring – floating unbiased

Total alpha resolution (junction) 241 Am 75KeV maximum

Total alpha resolution (ohmic) Am 100KeV maximum

Metallizing aluminum 3000A° minimum (4KeV electron cut off)

Both sides (to specify) 3000A° maximum (4KeV electron cut off)

Reliability (NASA standard) 21 days + 40°C 10 –6 torr V operating (72 hours for Engineering models)

Leakage current must plateau over this period normally increasing by a factor of 8 to that at 20°C

This vacuum test can be a failure mode

Flight qualification: Followed by QA documentation / Test Data/ C of C

Wire bonding: minimum 2 per electrode with 3 preferred, anode, cathode with guard ring floating

(100%

Non-destructive pull test: MIL-STD-883 Method 2023.5)

Quality assurance: ISO9001 (full traceability) BSENISO9001-2000

Mission quality assurance to inspect and approve as required at Micron (Lancing) or LASP (Colorado)

Detectors supplied with QA release documentation/ test data/ C of C (Certificate of Conformance)

Detector labelling

Gold plating:

Soft gold ultrasonic wire bondable

Rolled annealed copper if rigid flexi

NASA approved company to be used

Detector Packing:

Flight shipping packs, for containing trays, designed and supplied with individual detectors with identification as agreed with LASP. These trays will be suitable for transit between clean rooms at Micron and GSFC and during shipment with courier between destinations Deliverables or Delivery Schedule

The deliverables required are the MSD040 SSDs. The delivery schedule is to be no later than 7 months after receipt of contract. The detectors should be delivered to the MERIT PI, Dr. Shrikanth G. Kanekal, Code 672, NASA/GSFC. The detectors will have accompanying documentation describing the tests conducted and qualification details.

Government-Furnished Equipment and Government-Furnished Information

N/A Place of Performance

Work is to be performed at the contractor’s site.

Period of Performance

Period of performance will be up to 7 months after receipt of the contract.