IMACS Engineering Run, June 2 - 13, 2006
- IMACS Engineering Run, June 2 - 13, 2006
- Tasks
- Proposed Schedule
- Personnel and Observatory Support Required
- Report
Tasks
MMTF
- Assemble and Install MMTF
- Assemble and Install MMTF filters
Focal Plane Tilt Correction
- Remove precision locating bushings in f/2 camera to allow dewar to be shimmed
Throughtput Testing
- Mount laser and power detector in the instrument optical path to determine throughput
Miscellaneous Maintenance and Other Work
- Slit Mask Server Work
- replace upper Delrin Slide
- replace encoder
- check grooved rollers (cammed and fixed)
- check spring loaded roller motions
- f/4 Filter Server Issues
- investigate recently reported interference problem
- investigate insertion problem
- Light Leak Issues
- take images with modified 'pinhole camera'
- Instrument Axial Motion Issues
- investigate instrument motion along the optical axis
- GTM Position Issue
- carry out GTM zero point calibrations
- SH Image Motion Issue
- measure off-axis SHGC flexure - time permitting
Proposed Schedule
- June 1 - arrive and gather necessary equipment
- June 2 to 6 - MMTF work
- June 8 - mechanics/electromechanics
- June 9 - remove bushings, tilt dewar, on sky off-axis SH testing
- June 10 - throughput testing, mechanics (time permitting)
- June 11 - mechanics
- June 12 - mechanics
Personnel and Observatory Support Required
SBS
- Tyson Hare; arrives June 2, leaves June 13
- Alan Dressler
- Alan Bagish
- Christoph Birk
LCO
- Scientific Staff - Mark Philips and Dave Osip
- Site Engineering - Frank Perez
- Instrument Specialists (G. Martin, M. Navarette, J. Bravo)
- Machinists (O. Duhalde, G. Martin)
MMTF Team
Report
MMTF Assembly and Installation
- The MMTF mechanical assembly was installed with minor modifications. When test fitting the assembly (without the Etalon) a small interference was discovered between the Matrix Ring and Mounting Guides. It was determined that the MMTF base plate was thicker than expected. The problem was resolved by removing 3.5 mm of material from the pins busing tabs on the base plate, which required disassembly for the machining process to take place. Effectively this allowed the assembly to sit closer to the Disperser Wheel.
- The full assembly was installed with a minor change to the assemly order. Upon attempting to install the MMTF assembly as designed it was discovered that connecting the cables was a difficult process. Also, a minor interference occured between the large connector and the wheel which prevented the assembly from seating correctly. Flipping the Etalon about its XY planes resolved the interference problem. Rotating the Etalon 120 degrees in the assemble provides easier access to the connectors.
- The pupil alignment baffle was assembled and installed with minor modifications to two components. Care is needed when installing this assembly to ensure that there is no contact with the front glass serface. Although the assembly can be installed and removed while the MMTF is on the Disperser wheel it is recommended that the baffle be installed and removed while the MMTF assembly is on the workbench.
- Front and back cover plates where requested by the MMTF team
- Assembled and installed h-Alpha filter. Filter will to be returned to US to be repaired/replaced by Custom Scientific
- Assembled and installed AAO R8 and B4 filters. These filters were to thin to obtained focused images, even with the window glass added to the filter assembly. All AAO filters boxed up to be returned to AAO.
- The MMTF was successfully commissioned. Details to be provided by the MMTF team.
Focal Plane Tilt Correction
- Precision bushings were removed with a hydraulic pressure technique (by filling the mounting hole with vaccuum grease, inserting a pin fitted to the ID of the bushing and tapping it with a hammer).
- The tilt in the focal plane was corrected by placing a 0.025" shim under 'the chip 4 corner', a 0.020" shim under 'the chip 1 corner', and a 0.005" shim under 'the chip 7 corner'
- Pinhole spots of approximately 2 pixels from the center to the field edge were imaged.
Throughput Testing
- Laser equipment was setup and tested. The testing involved setting up the laser and detector on a table and measuring the throughput of a old IMACS lens. The tests were encouraging and showed that useful results could be obtained.
- Further parts were fabricated on site to allow the lasers and detectors to be mounted on the instrument.
- Throughtput tests were conducted through the f/4 optical path, f/4 camera, f/2 optical path, f/2 camera, and collimator/field lens
- Tests show throughputs of approximately 60% for both f/2 and f/4 modes. Transimission of each camera was determined to be roughly 80%, while the collimator (including field lens) was found to be approximately 75%.
- These results indicate the possibilty of poor A/R coatings in the system.
- Visual inspection of the f/2 camera revealed the possibilty of a poor coating on a lens near the back of the camera, possibly S08.
- Further inspection and testing will be conducted to determine transmission characteristics and discover potentially poor coatings.
Miscellaneous Maintenance and Other Work
- Slit Mask Server Work
- Installed new encoder. Original encoder (the one replaced) will be kept as a spare.
- Did not replace upper Delrin groove rail. Rail to be modified with larger lead-ins at SBS.
- Recalibrated the slit mask positions. Cycled the server with no failures.
- Discussed modifications to be made to Slit Mask 'wings'. Wings require lead-in on leading and trailing edges to facilitate smooth transitions between grooves in Delrin block and rollers.
- f/4 Filter Server Issues
- Investigation of the filter server (due to recently reported problems) revealed that the motor break was not functioning normally. This was evidenced by slight grinding sounds at the beginning and end of moves, typical of the sound heard by the motor driving with the break on. Also, the break was not heard changing state.
- The rodless air cylinder was found to be sticking near the retracted end-of-travel limit. The guide rails were lubricated with a fine layer of diffusion pump oil.
- The filter server was cycled and functioning as expected.
- f/2 Filter Server
- An interference between the new filter baffles and the small air cylinder positioning/retaining nut on insertion arm was discovered. The nut was machined down to remove the interference and reinstalled. The filter server was tested and functioned normally. This further presented the opportunity to discuss alignment, interference, and assembly procedures of this part of the filter server with J. Bravo and M. Navarette.
- Instrument Axial Motion Issues
- The instrument was found to be in the nominal position, as left during the last inspection.
- The rollers were inspected and found to be properly configured and operating as expected. The rollers were exercised manually when the instrument was both stationary and under rotation
- Light Leak Issues
- The pinhole camera filter adapter was modified to hold five pinholes.
- The pinhole images were not taken due to time constraints.
- Dewar Plumbing
- Installed new stainless steel coolant plumbing. Initial inspections revealed no leaks.
General Notes
- Thanks to Oscar, Gabrielle, Dave and Frank for excellent on-site support, as per usual.
- Required Parts / Equipment
- Small parts storage unit
- Duct Tape
- Stainless Steel cleaner
- Scissors
- Miscellaneous storage boxes and containers
- Future Work
- Continued image testing - aspherical abberations and SH corrections
- Image motion issues - Rotator Guiding investigation
- Pinhole camera images
- Modified SMS parts - Delrin rails and wings
- Apply grease to spring loaded rollers on SMS
- Measure flexure of IFU - related to image motion and rotator guiding
- Test collimator coatings and clean the field lens
- Clean-up IFU storage container
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