Engineering proposal for optical tests on Keck1 and Keck2

Nov 04 - Jan 05

S.Panteleev

Optics Engineer

1. Calibration of focus compensation parameters (elevation) - KII

1. PI: Sergey Panteleev
2. Purpose: to calibrate focus correction parameters (for elevation) for different instruments
3. Test number: T430, T464, modified
4. Test duration: 2 - 2.5 h for each instrument
5. Description: I request these tests on a regular basis. So far, it was done for Hires, Lris, Nirc and Esi (partly). The tests for the other instruments planned have not been done or done only partly due to different reasons (weather, bad seeing etc). The test procedure is to measure focus variation at different elevations using MIRA for an instrument and Autofoc for an instrument guider.
6. Telescope/configurations:

-        K2 – F/15 DEIMOS

-        K2 – F/15 NIRSPEC

-        K2 – F/15 ESI

7. Reduction: the test data will be reduced during the following after test week with a possible correction of the current compensation coefficients.
8. Preferable date: no
9. Status from previous engineering time:

-        DEIMOS – planned on Oct 19 – cancelled due to weather

-        K2 PCS – calibration is done, data reduced

-        ESI – in plans on Nov 8

2.     Calibration of focus compensation parameters (rotation) - KI NIRC, LWS & F/25 guider

1.     PI: Sergey Panteleev

2.     Purpose: to test rotation dependence for focus of three instruments: NIRC, LWS and the guider

3.     Test number: T484, modified

4.     Test duration: 1.5h

5.     Description: In order to prepare for Continuous Focusing implementation, we have to understand how rotation angle affects NIRC focus and guider focus.  The test procedure is to measure focus variation at different rotation angles with a telescope at zenith using MIRA for an instrument and Autofoc for the guider guider.

6.     Telescope/configurations:

a.      KI – F/25

7.     Reduction: the test data will be reduced during the following after test week with a possible correction of the current compensation coefficients.

8.     Preferable date: Dec 20 engineering night?

9.     Status from previous engineering time: n/a

3.     Calibration of focus compensation parameters (rotation) - KII

1. PI: Sergey Panteleev
2. Purpose: to calibrate focus correction parameters (for rotation) for different instruments
3. Test number: T484, modified
4. Test duration: 1.5 h for each instrument
5. Description:  This is a regular test requested for instrument focus. The test procedure is to measure focus variation at different rotation angles with a telescope at zenith using MIRA for an instrument and Autofoc for an instrument guider.
6. Telescope/configurations:
1. K2 – F/15 DEIMOS - planned on Oct 19 – cancelled due to weather
2. K2 – F/15 NIRSPEC
3. K2 – F/15 ESI - – in plans on Nov 8
7. Reduction: the test data will be reduced during the following after test week with a possible correction of the current compensation coefficients.
8. Preferable date: none
9. Status from previous engineering time: n/a

4.  Parfocality measurements – KII

1. PI: Sergey Panteleev
2. Purpose: to measure the difference in focus positions between instrument guiders and scientific detectors
3. Test number: T974
4. Test duration: 1.5 h
5. Description: as the Continuous Focusing is moving to implementation, it becomes critical to know the parfocality for all instruments. The continuous focusing will correct the focus for a guider. We need to know a correction factor to correct the focus at the instrument detector. So far this test was done only for the Lris offset guider and NIRC and LWS.
6.  Telescope/configuration:

  K2 – F/15 Deimos - planned on Oct 19 – cancelled due to weather

 K2 – F/15 ESI – in plans on Nov 8

 K2 – F/15 Nirspec

7. Reduction: the test data will be reduced during the following after test week.
8. Preferable date: none
9. Status of previous test:

 The test data for LRIS offset guider parfocality has been reduced. The non-parfocality varies from 0.05 to 0.25 mm depending on guider position

 The Deimos parfocality was measured during one of the CF tests. The test gave around 10 microns non-parfocality. However, the other CF tests indicate that it is around 50 – 70 micron. A new test is needed to confirm.

The NIRSPEC parfocality was measured for the annular guider at four field points. The results has shown field dependency. We need another test with more samples to understand what we need to make the guider parfocal.

5.  Secondary mirror recoating – KII

1. PI: Sergey Panteleev
2. Purpose: recoat the secondary mirror which has 3.5 year coating now. This will require three days which means that the telescope will be out of operation for two nights. The following half of the night will be used for optical alignment of the secondary after installation.
3. Test number: n/a
4. Test duration: 3 days and 0.5 night (on Dec 1)
5. Telescope/configurations:
1. KII
6. Reduction: n/a
7. Preferable date: Nov 29 through Dec 1
8. Preferable time: n/a
9. Status of previous test: n/a

6. New Autofoc

1. PI: Sergey Panteleev
2. Purpose: testing new Autofoc script
3. Test number: n/a
4. Test duration: 2h

We will run new Autofoc and compare results with old Autofoc at different telescope positons and on different magnitudes.

5. Telescope/configurations:
1. KI or KII – any instrument
6. Reduction: the test data will be reduced during the following after test week
7. Preferable date: it may be done on ESI night on Nov 8.
8. Preferable time: none
9. Status of previous test: n/a

7. Segment rewarping on KII (this is optionall task depending on time availability)

1. PI: Sergey Panteleev
2. Purpose: rewrap three segments with pure image quality. There are three segments on KII that I’d like to rewrap. They were UFSed on the cloudy night last June that may be the reason for not accurate initial warping.
3. Test number: n/a
4. Test duration: two half nights: for UFS test and PCS tests
5. Telescope/configurations:
1. KII F/15
6. Reduction: n/a
7. Preferable date: Dec 1 and Dec 2
8. Preferable time: n/a
9. Status of previous test: n/a