(r8) TimingReview_Mar15_2017 < Palomar/ZTF

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---+Timing Review March 15, 2017

This review will examine the current observation overheads and speed-performance trades.   These affect both:
   * survey efficiency
   * data delivery time  (and thus time from observation to event detection) 

It is understood that we do not have final, or in some cases even preliminary results, but the purpose of this meeting is to focus attention on these important issues.  All overheads are up for discussion including but not limited to  command processing, readout time, repointing, control loops (guide, focus), filter exchanges, FITS file writing and data transport to IPAC.  Processing speed at IPAC is not on the agenda.

The official timing diagram for an exposure sequence is here:   (a screen shot is included below) 
   * http://www.oir.caltech.edu/twiki_oir/pub/Palomar/ZTF/PerformanceBudgets/ztf_timing_v2.5.xlsx

---++ Logistics

| *Time* | 2017, March 15, 11 am |
| *Location* | Cahill 126 |
| *Polycom Phone* | (626) 395-8884 |
| *Backup Phone* | (626) 395-8646 |
| *Video conferencing* | Zoom between Dekany and Zolkower |

---++ Agenda
| Start | Minutes | Presenter | Topic |
| 11:00 | 10 | Smith | Introduction: Timing diagram; timing budget allocations |
| 11:10 | 15 |Henning | Telescope slew and settling |
| 11:25 | 10 | Henning | Dome and windscreen slew and settling |
| 11:35 | 10 | Porter | Filter exchange |
| 11:45 | 10 | Milburn | Tip-Tilt-Focus analysis; guider latency |
| 11:55 | 10 | Cromer | Hexapod control |
| 12:10 | 15 | Kaye | CCD readout time; noise-speed trade |
| 12:20 | 10 | Hale | Camera command processing;  compression, FITS writing |
| 12:30 | 10 | Riddle | Data transfer from ZTF servers to IPAC |
| 12:40 | 10 | Riddle | Observation scheduling and control |
| 12:50 | 10 | Dekany |Future milestones and dates |
| 13:00 | 15 | Discussion and action item review |
| 13:15 |  |  | Adjorn | 

Please attach your presentations below.

---++ Guidelines

Speakers are asked to present:
   * Design values
   * Describe current/planned measurement methods
   * Data on current performance (if available).
   * Speed-performance trades (eg. read noise vs. read speed;  slew time vs. settling accuracy)
   * Plans for further tests and improvements.
   * Timeline for further work

 
*Timing diagram as at Mar 15, 2017:* <br />
     <img src="%ATTACHURLPATH%/ZTF_exposure_timing.png" alt="ZTF_exposure_timing.png" width='1635' height='647' />

-- Main.RogerSmith - 13 Mar 2017

   * [[%ATTACHURL%/ZTF_command_sequence_timing.xlsx][ZTF_command_sequence_timing.xlsx]]: measured ZTF command timing

   * [[%ATTACHURL%/Timing_Review_2016-03-15.ppt][Timing_Review_2016-03-15.ppt]]: ZTF Timing Review: Camera Command Processing

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
pptx	TimingPerformance.pptx	r1	manage	1473.6 K	2017-03-15 - 00:23	UnknownUser	Timing Review CCD clocking and readout
ppt	Timing_Review_2016-03-15.ppt	r1	manage	218.5 K	2017-03-14 - 23:13	DavidHale	ZTF Timing Review: Camera Command Processing
pptx	ZTF_Timing_Review_#8211_Filter_Exchanger.pptx	r1	manage	6660.6 K	2017-03-14 - 21:14	UnknownUser	ZTF Timing Review – Filter Exchanger
xlsx	ZTF_command_sequence_timing.xlsx	r1	manage	56.1 K	2017-03-14 - 23:12	DavidHale	measured ZTF command timing
png	ZTF_exposure_timing.png	r3 r2 r1	manage	870.4 K	2017-03-15 - 04:34	RogerSmith	V2.5, as at Mar 15, 2017

Topic revision: r8 - 2017-03-15 - RogerSmith

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