IMACS progress report no. 53 B. Bigelow 11 September 2002 I) Project Status Currently scheduled tasks: Status: a) DSS drive design (Hare) IP b) DSS drafting (except drive) (Cleary) Done c) DSS assembly/testing (Hare, Kowal, Castillo) IP d) DSS Grating Tilt Mech testing (Hare) IP e) Calibration system mech. des. (Hare) on hold f) CCD array assembly (Thompson/Burley) IP g) Grism procurement (Sutin) IP h) Instrument electronics assembly (Bagish) on sched. i) Control software design (Birk) on sched. j) Instrument enclosures fab (Gunnels/Paragon) IP k) Instrument utility wrap design fabrication (Rettig) IP l) IFU design and build (U. Durham) IP Project events in August: - Five IMACS papers presented at the Astronomy 2002 SPIE meeting in Hawaii - Short camera assembly started with S03 Latest project images: Final Assy: http://www.ociw.edu/instrumentation/imacs/devel/final/index.html Dewar Assy: http://www.ociw.edu/instrumentation/imacs/devel/dewar/index.html Enclosures: http://www.ociw.edu/instrumentation/imacs/devel/enclosures/index.html II) Optics (Sutin) * The frame labels arrived, but were labeled on the wrong side. They have been re-sent out. * Tinsley seems to be making progress more slowly than anticipated, but is still moving forward. Bigelow and Sutin visited Tinsley 2002-09-05 and have a better understanding of what problems they are having. * We decided to make a second S04 element, because of the cracks in the backside. The replacement is at TORC in generation, and should be done in four weeks. TORC is paying for the polishing of the replacement. * The 200 l/mm grism is finished and at OCIW. * 300 l/mm grism glass is at HJOL. One side failed final QC, with 1/3 wave PP. I told them to get it under 1/4 and we would take it. * 600 l/mm grism glass is at STF, being coated. * Still no response from Schott about L05 replacement material. * We are going ahead with the simpler echellette design. It needs to be finalized at some point. III) Electronics (Bagish) In August - All PCBs have been assembled and tested to be OK - 25% of electronics cables have now been assembled - TCP/IP to serial interface break-out was assembled and and tested OK - RTD temp. sensors tested and a full set has been ordered - Chassis 1, 3, & 4 upgraded to latest hard-stop logic. Hard-stops rewired for fail-safe operation In September - Continue cable assembly - Upgrade hard-stop logic in Chassis 2 - Test fluid flow in rack heat exchanger - Send MCS front panels out for final finish, anodizing, and engraving IV) Software (Birk/Clardy) Birk: - Gratings/Disperser-wheel: no progress in Aug. - DSP/Science Array Software: The prescan pixels have been removed. The Sub-raster mode works and the binning has been tested for any combination from 1x1 to 4x4. (MIKE version) I plan to start testing the IMACS version of the DSP code during Greg's stay in September. - The detector focus motor has been tested outside the dewar and it works fine. During September I hope to run the one that is mounted to the dewar with the limits and home-sensor connected. - AlanB and I tested the TCP/IP to serial converter in the rack. We have two devices connected to it (HP-Data-Acquisition unit and PI-Piezo controller) and it worked fine. During September we plan to move the second rack downstairs and run all of our devices through the converter. - AlanB connected two 4-wire RTD (temperature sensors) to the HP unit and I ran a 60 hour test over a weekend to verify the sensor data quality and the reliability of the data transmission (using the TCP/IP to serial converter). Everything worked and the maximum temperature difference was about 0.2 C and very stable. - I plan to test the second shutter during September. Clardy: (Clardy) In August: - Algebraic computation of grating angle from requested center wavelength and grating density now correctly done. - Program to interactively plot the x-y motions found from reading a G-code (.nc) file; and display (optionally) the mask boundaries and avoidance zones. Also lists the time taken based on motion length and feed rates, and departures of linear motions from the curved surface to verify auto-focus will be in range. - Code introduced to optimize the order of cutting mask features minimizing the travel time between features. Finding a local minimum in the "traveling salesman" problem. This may be done either when the mask definition file is found or during the mask cutting program. - Code introduced to avoid passing through any of a set of circular zones (usually around clamping fixtures), and also to maintain height within a specified tolerance (auto-focus) of the spherical mask blank. This code uses a recursive algorithm to introduce an intermediate point when needed to avoid obstacles or stay within the needed distance of the sphere. - All feed rates and avoidance parameters, along with some others are placed into a parameter file to supplement the compiled values and allow easy changes during early development. Coming up: - Putting many of the improvements from the experimental GUI into the current "gmap" operator's GUI, and customizing those features which will be needed for IMACS observing. All the current "gmap" features will also be retained. In addition, an easier parameter file interface as requested by Skip is implemented. - The mask cutting still needs to be coordinated with the actual cutting machine operation, mostly in defining how the offsets and coordinate system are set up. This is needed both in the IMACS and LDSS mask definitions. - The avoidance and offset values for the LDSS mask cutting need to be refined to better and more accurate values. The labels may need to be repositioned to avoid defining pins near them. - GUI interface for Astronomer data entry. - Ability to find location for holes giving desired light for the "wing chips". - Mask cutting should have sufficient safety checks that no user input can "crash" the laser machine. V) Detector Systems (Thomson/Burley) In Sept: 1) Getting the fiber link to work (prereq for the 8-chip readout) 2) Populating the rest of the chips in the IMACS array 3) Burley in Pasadena: 9/1 - 9/15, 10/1 - 10/15 VI) Mechanics (Bigelow/Hare) Bigelow: In August: 1) Progress grism cells - no progress 2) On vacation 8/5 - 8/11 - done! 3) Short camera as-built update - tooling design - first cut done 4) Order long camera baffles - done 5) SPIE meeting 8/19 - 8/29 - went! In Sept: 1) Continue short camera assembly 2) Finish instrument hatch/calibration screen design, start drafting 3) Finish grism cell designs, start drafting 4) Design additional hard-stop for mask server, start drafting Hare: No report this month due to vacation VII) Fabrication (Kowal) In August: 1) Shutter v2.0 is done. 2) 2nd Imaging Mirror Assembly is 50% finished. 3) Remade Pillars for G.T.M. 4) Milled various electronics panels for Alan Bagish. 5) Filter I.D. plates have been engraved. 6) Made jig for measuring flexure between guiders & slit masks. 7) In process of re-machining G.T.M. Base Plates out of 303 stainless steel. For September: 1) Completion of new G.T.M. Base Plates. 2) Completion of new Imaging Mirror Assembly. 3) Begin work on Slit Mask Carriers. 4) Begin work on Carousel Drive Mechanism. VIII) Other Business Next meeting: 9:00 TUESDAY, 10/1/02 - note different time and day! IFU report from Jurgen Schmoll, U. Durham - AOA microlens arrays finished and due to shipping. - Fiber bundles arrived at Durham. - Base plate two (final version), comb and auxiliary parts sent to anodizing. - V-rails sent to hard-anodizing to avoid wear when being used. - Fiber glass housing: Ordered. Company expect to finish 1st mold in 1st week of September. This mold will be used to create the 2nd mold (1 week later). Casting will last some days after 2nd mold is finished. - Dummy main frame will be not anodized. Completion of volume dummy is expected soon after delivery of the fiber glass housing. - The alignment tool for tilted chip glueing proved to be not useful when used with existing fiber bundles. It was replaced by a more appropriate tool, which works sufficiently. - Everything is ordered now, apart from coating of the microlens arrays which will take part after quality checks. - Alignment document preparation is going on. - Cells were made to accept lenslet arrays for quality check using a microscope. - Large alignment and assembly jig is in construction. Will allow horizontal and vertical orientations of the IFU for various steps of assembly.