F OS DEAD AND NOISY DIODES UPD A TE JENNIFER A CHRISTENSEN - - PDF document

SLIDE 1 F OS DEAD AND NOISY DIODES UPD A TE JENNIFER A CHRISTENSEN and STEPHAN E MAR TIN Sp ac e T elesc

• p

e Scienc e Institute

• San

Martin Drive Baltimor e MD

• Abstract

This pap er lists all the kno wn dead noisy

• and

susp ect dio des for b

• th

the F OSRED and F OSBLUE detectors as

• f

the end

• f

April

• Key

w

• rds

F OS HST Instrumen ts Dead dio des

• In

tro duction In this pap er w e presen t a summary

• f

all the kno wn and susp ected dead and noisy dio des

• n

b

• th

fo the F OS detectors When

• ne
• f

the

• dio

des

• n

either side is noticed to b ecome noisy

• r

ceases to collect data the F OS team initiates a monitor

• n

the susp ected dio de If there are

• separate
• ccurances
• f

un usual b eha vior the dio de will b e agged as dead

• r

noisy

• and

will b e turned

• As

the F OS team do es not regularly monitor all the data coming do wn from the telescop e w e rely

• n
• bserv

ers to w arn us

• f

p

• ssible

dead

• r

noisy dio des as w ell as sp

• tc

hec ks

• f
• ur
• wn

A dead

• r

noisy dio de w

• uld

app ear in a sp ectrum as an absorbtion

• r

emission feature that is exactly O VERSCAN NXSTEPS pixels wide In

• ur

usual mo de for

• btaining

sp ectra this w

• uld

b e

• pixels

in width A further discussion

• n

ho w to iden tify p

• ssible

problem dio des can b e found in the HST Data Handb

• k

pp

SLIDE 2 CHRISTENSEN

• MAR

TIN T ABLE I F OSBLUE susp ect and dead dio des Disabled Disabled Disabled Enabled Date Dead Noisy Crosswired p

• ssibly

Rep

• rted

Dio de Dio de Dio de bad

• Sept
• Jan
• Aug
• Aug
• No

v

• Calibr

ating HST Post Servicing Mission

SLIDE 3 F OS DEAD DIODES T ABLE I I F OSRED susp ect and dead dio des Disabled Disabled Enabled Date Dead Noisy p

• ssibly

Rep

• rted

Dio de Dio de bad

• July
• July
• x
• July
• Ma

y

• Dec
• Sept
• F

eb

• Oct
• July
• Mar
• Mar
• x
• Apr
• Calibr

ating HST Post Servicing Mission