| Version |
$Revision: 1.4 $ |
| Last Update |
$Date: 2001/11/08 14:46:10 $ |
| HRC CCB Status |
not reviewed |
Number: HRC-R-002
Type: Restriction
Original Date: 6/13/95
Subsystem: HRC
Subject: Lowered MCP HV in Radiation Zones
Source: Informal CARD inputs, e-mail, M. Juda, 9/11/95, SOP01
CRL Statement:
The MCP HV level must be lowered when AXAF is in a high particle radiation
environment defined by:
-
Regions where
- the flux of electrons with energies greater than 1 MeV exceeds 5
electron/s/cm2 or
- the flux of protons with energies greater than 1 MeV exceeds 5 proton/s/cm2
-
Solar storms.
CRL Rationale/Justification:
The HRC sensitivity to the particle radiation environment is derived from
the HRC design.
CRL Impact:
High rates (200 counts/sec/cm2) generated by the particle radiation
environment will permanently degrade HRC performance.
Recommended Action:
Incorporate into the Systems and Operations Procedures, with ASC providing
the inputs, and the OFLS and Operations Database (1 only), the EPHIN Flight
Software (2 only).
$Log: hrc-r-002.html,v $
Revision 1.4 2001/11/08 14:46:10 juda
HTML "href" tag edits to convert to soft links
Revision 1.3 1999/01/20 20:19:57 juda
changed altitude limit to flux limits on protons and electrons
Revision 1.2 1998/04/27 13:57:38 juda
Added Version table
modified 1998 March 16
-
specified a rate per area limit for degradation
Page created 1998 March 4 - Based on 30 Jan 98 release of OP05
Dr. Michael
Juda
Harvard-Smithsonian Center for Astrophysics
60 Garden Street, Mail Stop 70
Cambridge, MA 02138, USA
Ph.: (617) 495-7062
Fax: (617) 495-7356
E-mail: mjuda@cfa.harvard.edu