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COS SMOV Morning Update 25 June 2009


A genda
· FUV HV Turn-on Visits R1 and R2 (repeats 11 and 12 of 13) · Upcoming COS SMOV Timeline


COS FUV HV Turn-on:
Visits R1 and R2 (repeat 11 and 12 of 13) slow HVLOW to HVNOM ramp
· On Wed 24 June:
­ HV successfully taken in slow ramp from HVLOW (-4069 v) to nominal HVNOM level (A/B HVNOM command levels = 178/175) ­ Data collected after reaching HVNOM (Visit R1) and again after 8 hours at HVNOM (Visit R2) were completely nominal; a DCE memory dump was performed, and dark and wavecal exposures were taken in each case. All diagnostics remain nominal on both segments (see table on slide following) ­ No indication of any HV current transient behavior in the HVI histograms ­ Background rates and wavecal rates were consistent with previous visits ­ Background and wavecal PHDs from these visits are indistinguishable from those of visits 11 and 12 ­ Wavecals obtained in visits R1 and R2 are indistinguishable from each other

· Summary: all normal and similar to previous data;

­ W e re c o m m e n d c le a rin g e v e n t fla g 3 a n d c o n tin u in g w ith fin a l s te p in F U V H V tu rn -o n p ro c e d u re ­ ro u tin e ra m p to H V N O M (v is it 1 3 o n F ri m o rn in g )


COS FUV HV Turn-on:
Background / Wavecal Diagnostics Visit Summary Table
Visit 3 5 7 9 11 12 R1 R2 TV06 HV A/B 154/151 160/157 166/163 172/169 178/175 178/175 178/175 178/175 178/175 Bkg A/B 19.4/22.6 17.7/19.7 18.5/20.4 20.6/22.7 18.7/20.2 25.9/26.6 20.7/18.8 18.0/17.7 9.5/12.4 Lamp A/B 198.9/610.9 200.5/605.2 199.5/607.9 205.9/614.3 196.4/682.3 193.1/654.1 201.1/648.5 197.0/645.2 215.4/685.6 PHD µ A/B 7.0/7.0 9.3/9.6 11.5/12.1 13.4/14.4 14.7/16.0 15.1/15.9 14.8/16.1 15.1/16.1 14/14 FWHM (%) 59/50 52/39 42/32 34/24 26/23 27/25 26/24 26/26 40/32

·

Backgrounds and lamp rates (both SMOV and TV06) exclude the warm strip at the bottom of the B segment (the warm strip adds about 7 cps to the global background rate, but is well out of the spectral area). PHDs are given as weighted mean value rather than simply the peak bin. FWHM column is wavecal PHD FWHM (%).


U pcom ing C O S S M O V Tim eline
· Day 177: Fri 26 June
­ 1 1 3 5 6 v is it 1 3 o f 1 3 (C O S 2 3 ) F U V H V T u rn -o n
· · · · Routine transition from HVLOW to HVNOM, dump DCE, wave , dark exp OPS request required: clear NSSC-1 COS event flag 3 set in 11356R2 1135613 177:11:55:00 - 177:12:24:13 No event flag set; detector to HVLOW at end of visit; commence routine operation! · science data


U pcom ing C O S S M O V Tim eline
· Day 178: Sat 27 June
­ 1 1 4 8 3 : (C O S 2 5 ) F U V fu n c tio n a l te s t
· 1148301 178:00:09:24 - 178:03:02:19
­ Evaluate spectrum locations; prepare updates of TA parameters to be uploaded no earlier than SMS194 (input needed by day 188)

­ 1 1 4 8 2 : 5 v is its o f 1 1 (C O S 2 4 ) F U V d a rk s
· · · · · 1148204 1148205 1148206 1148207 1148208 1 1 1 1 1 78:05:32:00 78:08:56:00 78:11:10:00 78:21:13:00 78:22:48:00 178:06:58:36 178:10:13:52 178:12:11:42 178:22:30:41 179:00:14:27

· Day 179: Sun 28 June
­ 1 1 4 8 2 : 3 v is its o f 1 1 (C O S 2 4 ) F U V d a rk s
· 1148209 179:11:05:00 - 179:12:06:42 · 1148210 179:20:05:00 - 179:21:06:42 · 1148211 179:21:08:00 - 179:22:30:25