TRIO-CINEMA 1 UCB, 2/08/2010 STEIN Intro Davin Larson Space Sciences Laboratory University of...

TRIO-CINEMA 1 UCB, 2/08/2010

STEIN Intro Davin Larson

Space Sciences Laboratory

University of California, Berkeley


STEIN (SupraThermal Electron, Ion,

Neutral) sensor Energy range: ~2-300 keV Resolution: ~ 1keV FWHM Field of view ~15º x70º


CINEMA (Cubesat for Ions, Neutrals, Electrons, MAgnetic fields)


Energy-Angle Response for Edge Pixels


Energy-Angle Response for Middle Pixels


Center Pixel Response (Electrons) Edge Pixel Response (Electrons)

Deflection Voltage

4 kV 4 kV600 6000 1.5 kV1.5 kV

Left Sweep Right Sweep

• Symmetric response for ions

• Neutrals measured in center pixel – cleanly separated for energies below ~15-20 keV

• Logarithmic voltage sweep with ten steps from 600V to 4 kV is optimal for covering phase space. Need positive and negative sweeps to get all angles, so 20 voltage steps desired.


Estimation of Circuit board area


STEIN Preamp Schematic


STEIN Shaper Chain (1 of 4)


STEIN – DACs / Actel schematic


END of PRESENTATION


STEIN Testing

New deflector plates

Built and installed (1 of 2)

Test (planned) on 2010/1/9

Replace parallel plates withSeries of blades


STEIN

STEIN ETU on Manipulator


STEIN Electron Calibration Setup

yaw angle

Pen-rayUV Lamp

-V

Vacuum chamber(grounded)

Quartz window

VD CrLayer

DelrinInsulator

STEINMounted on 3-axis

Manipulator

Electron Beam

D0D3D2D1


Solid State Detector Basics

+35 V

~200A Al~200A Poly Si

300 micronthick detector

Outside at bias Voltage

n pExample:3.6 keVParticle strikesdetector

guard ring

It takes 3.6 eV to make one electron-hole pair

Total charge produced is:

N = 3600 eV /3.6eV = 1000 electrons = 1.6e-16C

Output PH is proportional to deposited energy!

Cha

rge

Time Time Time

Vol

tage

Vol

tage

CSA Shaper

2ns 2usPH

Avg signal in blackReal signal in red

The shaper circuit averages out the “noise”

Minimize distance-+


Solid State Detector Basics (Cont)

300 micronthick detector

Time

Vol

tage

Shaper

2usPH

The shaper circuit averages out the “noise”

Shaper

Time

Vol

tage2us

Thresh

ADC

FPGA(logic)

Convert signal occurs

when THRESH is high andPD passes through zero

Memory

Signal

DAC

Thresh

Convert

Read

Convert

PD

PD

Signal

Zero crossing

Comparator

ComparatorDifferentiator


single 4keV electron

2 simultaneous4 keV electrons


Response to Electron gun sweep

Time

AD

C c

han

nel

Singles

DoublesTriples

Count rate during electron gun sweep

notsymmetric

Benefits of automation:

It is extremely useful to collect data continuously and plot history of measurements.

Note slight increase in electron beam intensity and hysteresis effect between ramp up and ramp down.


Deflector

YAW angle

15 keV constant electron beam


Yaw angle

D0

D3

D2

D1Scattered e-’s

Detector response vs Yaw angle

D0

D3

D2

D1Total counts


< System Name > Agenda

AGENDAOverview

Requirements

Design

<Test Results if any>

Development Plan

Issues


Overview

Clyde Space10 x 1U Solar

Arrays

Clyde Space3U EPS

PumpkinPIC33

Computer

MHX2400Spread-

SpectrumTransceiver

Antenna*2

InstrumentInterface

Emhiser1W S-band

ScienceTransmitter

Antenna*2

MAG Sensors

StacerActuator

Preamp /Shaper / ADC

STEIN

+/-2KV HVPS,Bias

ShutterActuator

Torque Coils(2)

V-Slit SunSensor

MAGICElectronics

ClydeSpace30Wh

Battery

UmbilicalConnect.

Stacer

InstrumentLVPS

Processor Board

Combined LVPS/Logic

EXAMPLEONLY


Requirements

Level 2 C&DHCDH-01 Processing speed >5 MIPS, >10KFLOPS

CDH-02 RAM>16kbytes (TBR)

CDH-03 Program memory> 32kbytes (TBR), reprogrammable

CDH-04 Telemetry Recorder> 200Mbytes FLASH

CDH-05 Power ~100mW

CDH-06 Cubsesat compatibleCompatible with Cubesat Kit standards for form factor, sep switch interface, USB battery charging/debug interface, etc.

CDH-07 Transciver Interface Interfaces with MicroHard Transciver (data, power switching)

CDH-08 STEIN InterfaceInterfaces to STEIN via TBD interface to Instrument Interface Board (data stream, HVPS, bias, attenuator actuator)

CDH-09 MAGIC Interface Interfaces to MAGIC via SPI or Instrument Interface Board (TBD)

CDH-10 Sun Sensor InterafaceInterfaces to Sun Sensor via Instrument Interface Board

CDH-11 Torque Coil InterfaceInterfaces to Torque Coil power swicthes via Instrument Interface Board (PWM in C&DH or FPGA TBD)

CDH-12 EPS Interface Interfaces to EPS via I2C interfaceEXAMPLEONLY


PIC – UHF (UART)

PIC – EPS ( I2C )

PIC – SD card (SPI)

PIC – FPGA (SPI & I2C)

Clyde Space10 x 1U Solar

Arrays

Clyde Space3U EPS

PumpkinPIC33

Computer

MHX2400Spread-

SpectrumTransceiver

Antenna*2

InstrumentInterface

Emhiser1W S-band

ScienceTransmitter

Antenna*2

MAG Sensors

StacerActuator

Preamp /Shaper / ADC

STEIN

+/-2KV HVPS,Bias

ShutterActuator

Torque Coils(2)

V-Slit SunSensor

MAGICElectronics

ClydeSpace30Wh

Battery

UmbilicalConnect.

Stacer

InstrumentLVPS

SD

CARD

FPGA – Tx (bitsteam)

FPGA – STEIN (CDI)

FPGA – MAGIC (SPI)

Design

Data Flow Specifications

• Tx : 1 Mbps continuous

• SDCARD : 1.28 Mbps Write, 1 Mbps Read (min)

• STEIN: 16 bits/event, 80KHz events = 1.28Mbps

• MAGIC: 20 bits x 20 Hz x 3 axes = .001 Mbps

• UHF: 0.0096 Mbps

EXAMPLEONLY


Development Plans

Development• Pumpkin Development Board + Laptop PC

• MPLAB30 “C” Compiler, Simulator, Debuggers

• Subversion (SVN) for storing source code and documents

• GSE Laptop running GSEOS

• FSW Developed in phases:– CPU/Mother Board Only– CPU/Mother Board + [EPS, Batt, UHF, IIB] – CPU/Mother Board + [EPS, Batt, UHF, IIB] + [HVPS,STEIN, MAG]

• Verification Matrix Provides Status of Requirements

• Comprehensive Performance Test on Development Board

• Load into Flight System

• Joins CINEMA Test Flow and Quality reportingEXAMPLEONLY


Issues

CPU

Floating Point Mult/Div/Add performance#’s needed

Memory Very Small (especially 2K DMA area)

Pumpkin RTOS not useful for FSW

EXAMPLEONLY

TRIO-CINEMA 1 UCB, 2/08/2010 STEIN Intro Davin Larson Space Sciences Laboratory University of...

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