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SPIRE Consortium Meeting La Palma, Oct. 1 – 2 2008 System-level testing: results, plans up to launch Bruce Swinyard RAL. What we were supposed to do. What we’ve done. . . . . . . . . . . In riveting detail. February – Warm functional test

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Spire consortium meeting la palma oct 1 2 2008

SPIRE Consortium MeetingLa Palma, Oct. 1 – 2 2008

System-level testing: results, plans up to launch

Bruce Swinyard

RAL

System Level Testing Bruce Swinyard 1


Spire consortium meeting la palma oct 1 2 2008

What we were supposed to do

System Level Testing Bruce Swinyard 2


Spire consortium meeting la palma oct 1 2 2008

What we’ve done

System Level Testing Bruce Swinyard 3


Spire consortium meeting la palma oct 1 2 2008

In riveting detail

  • February – Warm functional test

  • March – Cold Functional Test

  • May – SMEC tests (pre vibe)

  • June – JFET switch on check (post Vibe)

  • July – more SMEC tests (post Vibe) – uVibration test

  • July – S/C EMC RE test

  • August – SPT – feat. EMC RS and uVibe test on detectors

  • September – RMS/SOVT1

System Level Testing Bruce Swinyard 4


Spire consortium meeting la palma oct 1 2 2008

Functional tests all o.k.

Everything survived vibe

SMEC has some issues

Results

System Level Testing Bruce Swinyard 5


Spire consortium meeting la palma oct 1 2 2008

Sticky SMEC in May

Drive current

Encoder signal

LVDT signal

System Level Testing Bruce Swinyard 6


Spire consortium meeting la palma oct 1 2 2008

In case you missed the point…..

LVDT signal

Drive current

Encoder signal

System Level Testing Bruce Swinyard 7


Spire consortium meeting la palma oct 1 2 2008

In July we unlatched again

Encoder signal1

Encoder signal2

LVDT signal

System Level Testing Bruce Swinyard 8


Spire consortium meeting la palma oct 1 2 2008

Now it scans…..

System Level Testing Bruce Swinyard 9


Spire consortium meeting la palma oct 1 2 2008

Microphonics – reaction wheels

System Level Testing Bruce Swinyard 10


Spire consortium meeting la palma oct 1 2 2008

Velocity stability vs PFM4

PFM4

IST?

IST –wheel

System Level Testing Bruce Swinyard 11


Spire consortium meeting la palma oct 1 2 2008

Velocity stability during wheel ramp

System Level Testing Bruce Swinyard 12


Spire consortium meeting la palma oct 1 2 2008

The cooler recycled (eventually!)

Base temp~297 mK – hold time ~21 hours

Wrong temperatures in cryostatWrong angle

System Level Testing Bruce Swinyard 13


Photometer temperatures
Photometer – Temperatures

~310 mK

PLW

System Level Testing Bruce Swinyard 14


Photometer temperatures1
Photometer – Temperatures

~320-325 mK

PMW

System Level Testing Bruce Swinyard 15


Photometer temperatures2
Photometer – Temperatures

~315-320 mK

PSW

System Level Testing Bruce Swinyard 16


Photometer pixel operability
Photometer – pixel operability

PLW

A6 – offset problem?

System Level Testing Bruce Swinyard 17


Photometer pixel operability1
Photometer – pixel operability

PMW

A13 – v slow

T2 - dead

System Level Testing Bruce Swinyard 18


Photometer pixel operability2
Photometer – pixel operability

PSW 1/2

A13 – v slow

C12 - dead

A11 – v slow

D15 – wrong way round

System Level Testing Bruce Swinyard 19


Photometer pixel operability3
Photometer – pixel operability

PSW 2/2

G8 - dead

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Power distribution
Power distribution

System Level Testing Bruce Swinyard 21


Temperature compare pcal to pfm4
Temperature – compare PCAL to PFM4

System Level Testing Bruce Swinyard 22


Spire consortium meeting la palma oct 1 2 2008

Cryocover mirror (SPIRE side):

Toric (=biconic in the model) with RoCs and position & orientation along chief ray set as per HP-2-ASED-TN-0076 Issue 2 (17/10/03) section 2.3

PCAL – optical model

PCAL:

1mmx1mm emitter feeding CM4 hole (~3mm diameter) via ~20mm long light pipe, based on SPIRE DDD & PCal ICD & Applied Optics 44-16 (2005); initially on-axis then sequentially tilted to represent prime and redundant

Telescope focal surface:

Virtual surface shared by all instruments

SPIRE Photometer:

ASAP optical model from design prescription BOLPHOT155

OPTICAL MODEL

System Level Testing Bruce Swinyard 23


Spire consortium meeting la palma oct 1 2 2008

Comparison Prime/Redundant (without cryo-cover)

Gradient along Z ~x2 but max gradient (~x3) in a diagonal + different orientation prime / redundant

Prime or redundant

PSW sampling

PLW sampling

3D view

The other one

System Level Testing Bruce Swinyard 24


Spire consortium meeting la palma oct 1 2 2008

Comparison Prime/Redundant (with cryo-cover)

Dominated by return path from cryo-cover + only slight differences between prime & redundantc

Prime or redundant

PSW sampling

PLW sampling

Detailed

The other one

System Level Testing Bruce Swinyard 25


Photometer noise
Photometer Noise

System Level Testing Bruce Swinyard 26


Spectometer operability
Spectometer Operability

System Level Testing Bruce Swinyard 27