16 June 2003, Monday

Keck I Engineering plan

Split night:

• 1st half HIRES science (Chaffee PI),
• 2nd half Pointing test T920b

"Wayne Dahl is planning to come in to his office whenever Terry S. (OA) finishes the first pointing test (~2 AM), generate a new pointing model using those data, and have Terry take as much of another pointing test as he can for the rest of the night. So far as we know, this will be the first time a new pointing model has been tested *immediately* after it was generated" - F. Chaffee

Below is an email from Kyle K. with TPTT plans for addressing the K1 pointing problems

The TPTT formulated the following plan today to address the recurring K1 telescope pointing problems:
Wayne Dahl (WD) was tasked to mathematically model Ron Quick's pointing model correction recommendations and upload the new correction algorithm for tonight's observing. WD concluded that adding this correction algorithm (derived over only 1/4 of the sky) will not improve telescope pointing over the entire sky (it actually makes it worse). See correspondence from WD dated 6/16/03 (utilizes the new correction algorithm on data collected on a complete 3/15/03 pointing test). The following engineering plan was formulated based on these conclusions:

• Date: Monday, 16 June 2003
  Configuration: f/15 + tertiary,
  Hires Guider / Star Stacking Camera SSC
• T920B Pointing test, guider or SSC 4.5 hours
  W. Dahl
• Wayne Dahl is planning to come in to his office whenever the OA (Terry S.) finishes the first pointing test (~2 AM), generate a new pointing model using those data, and have Terry take as much of another pointing test as he can for the rest of the night. So far as we know, this will be the first time a new pointing model has been tested *immediately* after it was generated.
• WD will analyze the results of both pointing tests and will upload this resulting correction algorithm for the second half of Thursday evening when another pointing test is desired.
  Randy, please schedule the pointing test.
• WD will analyze the results of Thursday's pointing test and will upload this resulting correction algorithm for Friday's observing program.
• The TPTT will want immediate feedback from the observer and observing staff after the Friday run for corrective action planning on Monday morning.
• For the record, replacement of Az. encoder #1 improved the Az encoder #1 performance by a factor of 8 (both encoders now showing 5 arc sec repeatability). Due to these results, no immediate repair work on the Az encoders is currently planned. Documentation for future repairs will be completed in the next week or so.
• Bob Moskitis and Tom Nordin will plan a troubleshooting effort for the elevation encoder performance this week and coordinate this with the TPTT prior to scheduling.
  K3 (Kyle K.) will continue to lead the coordination efforts on this project until further notice.