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

F OS DEAD AND NOISY DIODES UPD A TE JENNIFER A� CHRISTENSEN and STEPHAN E� MAR TIN Sp ac e T elesc op 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 oth the F OS�RED and F OS�BLUE detectors as of the end of April �� Key w ords� F OS� HST Instrumen ts� Dead dio des �� In tro duction In this pap er w e presen t a summary of all the kno wn and susp ected dead and noisy dio des on b oth fo the F OS detectors� When one of the �� dio des on either side is noticed to b ecome noisy or ceases to collect data� the F OS team initiates a monitor on the susp ected dio de� If there are � separate o ccurances of un usual b eha vior� the dio de will b e �agged as dead or noisy � and will b e turned o�� As the F OS team do es not regularly monitor all the data coming do wn from the telescop e� w e rely on observ ers to w arn us of p ossible dead or noisy dio des� as w ell as sp ot�c hec ks of our o wn� A dead or noisy dio de w ould app ear in a sp ectrum as an absorbtion or emission feature that is exactly �O VERSCAN �NXSTEPS� pixels wide� �In our usual mo de for obtaining sp ectra� this w ould b e �� pixels in width�� A further discussion on ho w to iden tify p ossible problem dio des can b e found in the HST Data Handb o ok � pp ��

CHRISTENSEN � MAR TIN T ABLE I F OS�BLUE susp ect and dead dio des Disabled Disabled Disabled Enabled Date Dead Noisy Cross�wired p ossibly Rep orted Dio de Dio de Dio de bad �� Sept �� Jan �� Aug �� Aug �� No v �� Calibr ating HST� Post Servicing Mission

F OS DEAD DIODES T ABLE I I F OS�RED susp ect and dead dio des Disabled Disabled Enabled Date Dead Noisy p ossibly Rep orted 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

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

F OS DEAD AND NOISY DIODES UPD A TE JENNIFER A CHRISTENSEN and STEPHAN E MAR TIN Sp ac e T elesc op e Scienc e Institute San Martin Drive Baltimor e MD Abstract This pap er

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

F OS DEAD AND NOISY DIODES UPD A TE JENNIFER A CHRISTENSEN and STEPHAN E MAR TIN Sp ac e T elesc op e Scienc e Institute San Martin Drive Baltimor e MD Abstract This pap er

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