Particles and Fields Package PFP Peer Instrument Critical

Particles and Fields Package (PFP) Peer Instrument Critical Design Review SWIA Mechanical Gregory Dalton Gregory Johnson UCB-SSL PFP Peer i. CDR 2011 5/9 -11 1

SWIA Mechanical Overview • • • • PFP Peer i. CDR 2011 5/9 -11 Assemblies and Features Materials Analyzer Construction Cover Release Mechanism Attenuator Construction MCP Construction MOBI Motor Assembly Purge Construction Electronics Board Stackup Electronics Box Construction Mounting and Interconnects Analysis Outstanding Issues, ETU testing 2

SWIA Status • Drawings – 100% complete • Fabrication – many parts complete, quotes out, parts in shop • All PDR FRA’s addressed • Testing – anode assembles, placed in calibration chamber PFP Peer i. CDR 2011 5/9 -11 3

SWIA Assemblies and Features Attenuator/ Cover Release Analyzer Anode Electronics PFDPU/S-C Connectors Mounting Feet PFP Peer i. CDR 2011 5/9 -11 4

SWIA Materials and Construction Standard UCB Construction: • Machined/Etched Parts – 6061 -T 6 Aluminum – 2024 -T 8 Aluminum – 544 Bronze – 303 Stainless Steel – Delrin AF, PEEK 450 G, Vespel SP-1/3 – Be. Cu springs • Finshes – Alodine – Anodized – Gold Plating – Ebonol C, Black Chrome, DAG-213, Black Electroless Nickel with Teflon Thermal Treatments • Blankets (LM supplied) • Thermal Taping (LM supplied) Long lead Items • MCP • Carbon Foils/Carriers • Ti. Ni P 5 Pin Pullers PFP Peer i. CDR 2011 5/9 -11 5

SWIA Analyzer Construction Cover Release/ Attenuator Cover in Closed Position Top Deflector Mount Top Deflector Outer Grids Aperture Ring Attenuator (down) Outer Hemisphere Bottom Deflector Mount Hemisphere Mount PFP Peer i. CDR 2011 5/9 -11 Inner Hemisphere Spider Plate 6

Cover Release Mechanism Ti. Ni P 5 Pin Puller Inner Slide Spring Plunger Burp Spring: • designed to relieve N 2 at 5 psi. • Holds cover closed during vibration Cover Open Burp Spring Safety Switch Retraction Spring Cover Closed Attenuator Latch Cover Seal PFP Peer i. CDR 2011 5/9 -11 7

Attenuator Cover Closed Cover Open Switch Cover Open, Attenuator Down Cover Stroke: 0. 220” Aperture stroke: 0. 225” Cover Open, Attenuator Up PFP Peer i. CDR 2011 5/9 -11 8

Attenuator Down Switch Assembly SMA Routing Attenuator Up Attenuator Design: • 2. 17 N per SMA wire, redundant wires in both directions • 30 g moving mass • 0. 51 N switch spring force in detent to actuate attenuator (to hold in 1 G environment) • 10 x SMA force design margin • 25% SMA wire over travel PFP Peer i. CDR 2011 5/9 -11 SMA Spring Block Attenuator Slide Assembly 9

SWIA MCP Construction Spring Clamps MCP Grid Spacers Spring Rings Spring Plates MCP Rings MCP Supply Voltage Pin MCP Spacers Anode Transition Plate PFP Peer i. CDR 2011 5/9 -11 10

SWIA Purge Construction N 2 Viton O-Ring PFP Peer i. CDR 2011 5/9 -11 1/8” NPT Cole Palmer compression fitting and right angle purge block. 11

SWIA Electronics Board Stackup LVPS Digital Standoffs between boards and shields Deflector/ Sweep HV Supply Preamplifier/ MCP HV Supply MCP Protective Cover Anode PFP Peer i. CDR 2011 5/9 -11 12

SWIA Electronics Box Connections LVPS to PFDPU HV Enable on Pigtail HV to Deflectors Digital to PFDPU HV to Deflectors Boards rigidly mounted to this panel PFP Peer i. CDR 2011 5/9 -11 Digital pigtails to MDM on Preamplifier Lower Deflector HV Preamplifier Hypertronics KA-17 to Anode MCP HV Supply 13

SWIA Mounting, Harness, and Purge N 2 Purge Connection Harness Connectors PFP Peer i. CDR 2011 5/9 -11 14

SWIA Frequency Analysis • 243 Hz first mode of Upper Analyzer • 14% mass participation PFP Peer i. CDR 2011 5/9 -11 15

SWIA Stress Analysis • 101 G static loading PFP Peer i. CDR 2011 5/9 -11 16

Cover Deflection and Load Radially constrained, 0. 010” gap Burp Spring Plunger PFP Peer i. CDR 2011 5/9 -11 Cover Clamp 17

SWIA Mass Budget Electrostatic Analyzer Assembly 0. 624 . 759 Anode Assembly 0. 424 . 252 Electronics (Including Boards) 0. 628 . 789 Mechanical Misc. (Housing, Fasteners) 0. 343 . 663 CBE SWIA Instrument Mass Allocation from MAVEN_PF_SYS_002 K Resources 2. 019 2. 463 2. 620 2. 98 30% 20% MARGIN • CBE mass based on a combination of: • Solid model with realistic mass properties • Measured SWIA prototype board mass • Measured mass of heritage parts and boards PFP Peer i. CDR 2011 5/9 -11 18

Future Plan ETU Testing • Attenuator Life Test – End of June • Concurrent assembly of detector for Calibration Chamber Testing – End of June • N 2 Purge Test • Exercise Manipulator • Vibration test for final frame design and structural verification with electronic mass dummies – Mid July Issues • Black Nickel coating vendor Beyond ETU • Flight fabrication in August PFP Peer i. CDR 2011 5/9 -11 19