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XMM-Newton Radiation Workshop
1st December 2000 Mauro Casale
& Fabio Giannini

VILSPA: 1st December 2000

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Summary

· ·

History of past strategy since launch up to Nov. 2000 Radiation alert: current strategy

VILSPA : 1st December 2000

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History of past radiation strategy (1)
· At launch: ­ monitoring based on: RM only
· Warning Flag parameter M5012 for both MOS's & PN

­ thresholds: 100 cps for both LE0 & HE0 · · ·

end of January 2000: ­ RM thresholds: lowered to 30 cps for both LE0 & HE0 beginning of February 2000: ­ RM thresholds: lowered to 10 cps for LE0 (HE0 remains to 30cps) March 2000: ­ monitoring based on: RM only

­ introduced an independent parameter. for EPIC-PN (MD027) ­ thresholds for MD027: 50 cps for LE0, 20 cps for HE0

· WF parameter M5012 for MOS's · WF parameter MD027 (derived parameter) for EPIC-PN

VILSPA : 1st December 2000

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History of past radiation strategy (2)
· June 2000: ­ monitoring based on: RM & RGS ­ RM thresholds: increased by 40 % for both M5012 (MOS's ) and MD027 (PN) i.e.: LE0 MOS : 14 cps, HE0 MOS: 42 cps; LE0 PN : 70 cps, HE0 PN: 28 cps; ­ Added monitoring of RGS parameters (R1SUD9, L1SUD9) for detection of low energy protons (requires RGS in Spectroscopy mode) ­ Defined new DP's for EPIC's (not linked yet to radiation procedures):
· for EPIC-PN based on Discarded Line TM · for EPIC-MOS based on sum of count rates on peripheral CCD's

·

End of August 2000: ­ monitoring based on: RM & RGS
­

Replaced the RGS parameters R1SUD9, L1SUD9 with derived parameters executing a running average over 2 minutes (GDS005, LDS005) for spike filtering

·

Mid September 2000: ­ monitoring based on: RM, RGS, MOS & PN
­

After the RGS-1 CCD-7 failure and subsequent change in RGS operational strategy: introduced check on MOS and PN parameters to complement the RGS TM

·

October 2000: redefinition of the radiation strategy (see following viewgraphs)
VILSPA : 1st December 2000

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Radiation Alert: current strategy (1)
· Principles: ­ limits applied on RM outputs were over-conservative (waste of science time) and meaningless (low energy protons were not detected) ­ protection from high energy radiation from 1mm of filter wheel is negligible ­ with exception of "big flares" the RM info can be totally replaced by information provided directly by the instruments (MOS, PN, RGS) ­ Full set of DP's have been implemented in the past for this purpose ­ PN is much more robust than MOS and needs less stringent criteria ­ RGS needs to be "saved" as well (go to SETUP), in case of "big flare" Implementation: ­ RM thresholds increased to 500 cps: detection of "big" flares ­ If RM WF = ACTIVE, then EPIC's are closed, RGS commanded to SETUP ­ Protection against low energy protons is implemented as follows:
· MOS : MOS info based on counts on peripheral CCD's (EDS001, KDS001) PN info based on Discarded line and limit set to 250, 800, 2400 (FD103) RGS info based on CCD-9 TM and limit set to 80 (GDS005, LDS005) · PN: PN info based on Discarded line and limit set to 400, 1200, 3200 (FD131) RGS info based on CCD-9 TM and limit set to 230 (GDS007, LDS007)
VILSPA : 1st December 2000

·

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Radiation Alert: current strategy (2)
· Procedures: ­ 3 procedures are now available:
· CRP_SYS_0025 for saving the MOS instruments: triggered by RGS output (lower limit) / MOS output / PN output (lower limit) · CRP_SYS_0023 for saving the PN instruments: triggered by RGS output (higher limit) / PN output (higher limit) · CRP_ERM_0021 for all instruments, except OM (i.e. including RGS): triggered by RM Warning Flag (500 cps / 15 minutes)

·

Restrictions: ­ PN information is only available when in LW, FF or ext. FF mode ­ PN information is only available when actual exposure starts (up to 1 h after start of Observation) ­ RGS information is only available if in Spectroscopy mode (could be in SETUP the whole revolution) ­ MOS information is available in all modes, about 10 minutes after exposure start (this delay will be reduced with next DB release) ­ No information is available at the beginning of the revolution (first Obs.) except from RM, to decide if first Obs. can safely start. ­ MOS & RGS information is only visible at the SOC (INSCON / SPACON can not back-up each other when off-console)
VILSPA : 1st December 2000

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Radiation Alert: current strategy (3)
· Precautions to cope with above restrictions: ­ If PN not in LW / FF / ext . FF and RGS not in Spectroscopy, then any action on MOS (based on "peripherals") also implies action on PN ­ At the beginning of Rev. all instruments disabled if WF = ACTIVE at the time of first observation. When WF goes INACTIVE start all instruments and apply CRP_SYS_0023 / 0025 afterwards, if required. ­ If no info from instruments and PN was in LW / FF / ext . FF when stopped, and WF = INACTIVE, then re-open PN every 0.5 h and inspect radiation level. If OK restart MOS's as well. ­ If no info from instruments and PN was not in LW / FF / ext. FF when stopped, then restart all instruments at next exposure (if WF = INACTIVE) and apply CRP_SYS_0023 / 0025 afterwards, if required ­ procedure in place to back-up the INSCON (Computer Operator) when offconsole; additional protection: if SOC System or MOC-SOC link unavailable for more than one hour during observations, then the MOC will save all EPIC's

VILSPA : 1st December 2000

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Radiation Alert: current strategy (4)
· Considerations on current strategy: ­ All instruments radiation sensitive parameters are influenced by bright pixels ­ MOS parameters almost only sensitive to soft protons, while RGS and p-n parameters also strongly influenced by high energy radiation ­ Very often the soft protons come in "thin layers"

·

Future improvements: ­ Introduction of yet another parameter for p-n when in Small Window/Timing/Burst to count number of events above 3000ADU Possible (but complex) improvements: ­ realtime measurement of integrated dose ­ differential measurements between RGS CCD1 and CCD9 ­ correlated measurements on RADMON and X-ray instruments to discriminate soft protons from less harmful radiation

·

VILSPA : 1st December 2000

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Radiation Alert: current strategy (4)
GDS005 LDS005 any any OOL any any any any any any any invalid invalid any OOL any any any any any any invalid invalid EDS001 any any any OOL any any any any any OOL any KDS001 any any any any OOL any any any any any OOL FD103 any any any any any OOL invalid invalid any invalid invalid GDS007 any any any any any any OOL any any invalid invalid LDS007 any any any any any any any OOL any invalid invalid FD131 any any any any any any invalid invalid OOL invalid invalid M5012 ACTIVE INACTIVE INACTIVE INACTIVE INACTIVE INACTIVE INACTIVE INACTIVE INACTIVE INACTIVE INACTIVE Procedure / actions to safe instruments CRP_ERM_0021: Close EPIC's + RGS to SETUP CRP_SYS_5025: Close MOS 1 & 2 CRP_SYS_5025: Close MOS 1 & 2 CRP_SYS_5025: Close MOS 1 & 2 CRP_SYS_5025: Close MOS 1 & 2 CRP_SYS_5025: Close MOS 1 & 2 CRP_SYS_5023: Close PN CRP_SYS_5023: Close PN CRP_SYS_5023: Close PN CRP_SYS_5025: Close MOS 1 & 2 + PN CRP_SYS_5025: Close MOS 1 & 2 + PN

issue 2, date: 15-11-2000

VILSPA : 1st December 2000

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Radiation Alert: current strategy (5)
GDS005 in limit (if valid) LDS005 in limit (if valid) EDS001 invalid (because MOS-1 has been stopped) invalid (because MOS-1 has been stopped) KDS001 FD103 invalid in limit (because (if valid) MOS-2 has been stopped) invalid (because MOS-2 has been stopped) invalid (because MOS-2 has been stopped) any any GDS007 any LDS007 any FD131 any M5012 INACTIVE Procedure / actions to restart CRP_SYS_5025: restart MOS 1 & 2

in limit (if valid)

in limit (if valid)

invalid (because in limit PN has been (if valid) closed in CRP_SYS_5025) invalid (because invalid also PN was (RGS not closed in in Spect.) CRP_SYS_5025) invalid (because in limit PN was stopped) (if valid) invalid (RGS not in Spect.)

in limit (if valid)

invalid (because PN has been closed in CRP_SYS_5025)

INACTIVE

CRP_SYS_5025: restart/rejoin timeline for MOS 1 & 2 and EPIC- PN

invalid (RGS not in Spect.)

invalid invalid (RGS not (because in Spect.) MOS-1 has been stopped) in limit (if valid) any

invalid invalid (because (RGS not also PN was in Spect.) closed in CRP_SYS_5025) in limit (if valid) invalid (because PN was stopped)

INACTIVE

CRP_SYS_5025: restart MOS 1 & 2 and EPIC-PN at the next Observation

in limit (if valid) invalid (RGS not in Spect.)

INACTIVE INACTIVE

CRP_SYS_5023: restart PN CRP_SYS_5023: restart PN every 0.5 h (go to OBS) and test status of radiation (extended also to next Observation, if necessary)

invalid any (RGS not in Spect.)

invalid (RGS not in Spect.)

invalid any (RGS not in Spect.)

invalid (RGS not in Spect.)

invalid invalid (RGS not (because in Spect.) MOS-1 has been stopped)

invalid (because PN was stopped, but PN was in LW / FF/ext FF when it was stopped) any invalid (because PN was stopped, but PN was not in LW / FF/ext FF when it was stopped) invalid invalid (because (because also PN was MOS-2 closed in has been CRP_SYS_5025) stopped)

invalid invalid (RGS not (but PN was in in Spect.) LW / FF/ext FF when it was stopped)

invalid (RGS not in Spect.)

invalid invalid INACTIVE (RGS not (and PN was not in Spect.) in LW / FF/ext FF when it was stopped) invalid invalid (because (RGS not also PN was in Spect.) closed in CRP_SYS_5025) went from ACTIVE to INACTIVE

CRP_SYS_5023: restart PN + MOS at the next Observation

invalid (RGS not in Spect.)

CRP_ERM_0021: rejoin timeline for MOS 1 & 2, PN, RGS's

issue 2, date: 15-11-2000

VILSPA : 1st December 2000

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