- Possible visiting spectrograph
- Kevin Luhman would like to bring Mike Skrutskie's
![[WWW]](/wiki/img/moin-www.gif "[WWW]")
CorMASS spectrograph to Magellan (is this the right instrument?). We should find out the desired schedule and possibly bring it up at the SAC meeting? - ADC schedule
- Charlie has designed shipping boxes for the ADC system and Brashear will build them. The latest shipping date is expected to be April 16, 2004, but I will push them to do it sooner. The ADC assembly will arrive in a box-in-a-box with the lenses covered. Arriving in a separate box, same shipment, are two aluminum shipping fixtures for the naked lenses. The lenses are already mounted in their cells but we are sending the shipping fixtures in case the lenses need to go back to Cleveland Crystals for re-coating. Charlie Hull is sending the rest of the ADC parts on the April 22, 2004, airshipment.
Installation will happen during the May 2-9, 2004, Baade engineering run.
NB: The lens surfaces cannot be touched at all.
I'd like to hold a video or phone conference with Charlie Hull on April 26, 2004, to go over the installation plan.
- May 31-Jun 1, 2004 Baade engineering run
- This run will be reserved for tuning the ADC system (active optics). Can Skip Schaller be available for night work?
- Joint Supplemental Reports
- These are needed for new facility instrument proposals. LCO staff should review the report and acknowledge that review (email to Uomoto from Perez). Because many changes can happen before instrument delivery, detailed analysis isn't necessary. However, if there are questions or severe support problems, they should be noted. The April 21-22, 2004, SAC meeting will see two new facility instrument proposals: MagE and an IR Echellette. The Joint Supplemental Reports are at:
http://www.ociw.edu/magwiki/MagEJointSupplemental (MagE)
http://www.ociw.edu/magwiki/IREchelletteJointSupplemental (IR echellette)
- Intervention observing
- Where do we stand on hardware? Software? (see M3 turrent sections below). I'd like to try a few dry runs during a future engineering run wherein someone at MIT submits an intervention request through the web interface. David Osip has some intervention time already and we can test the system with him on-site. Do we need additional telescope operator training (sounds like mostly procedures and communications)? Yes.
- New rotator amps
- There is one installed at LDSS now and it has been trouble-free for 5-6 weeks. The next test will be on IMACS (installation around May 27, 2004, during a PANIC run). LCO staff will also set up a test bench for the amps.
- Recharge Clay guiders
- Ian Thompson suggests that this engineering run would be a good time to recharge the krypton gas in the guider CCDs. Can this be done? Yes, it was already done at the time of this meeting.
In other guider news, there seems to be some indications that noise on the cameras might be related to the Racal video switch. Bypassing the switch seems to reduce the noise seen and a significant improvement was has by properly grounding the switch chassis.
- Status of using alternate amps on guiders
- The current state is that we can read out either amplifier on the CCD but the images come in mirrored (l-r reversed), that is, the image is not flipped before being presented to the reduction software. Since the guider feeds at least two different systems (the guider and the S-H), it probably makes sense to modify the guider data taking software to present the same format regardless of amplifier. Steve Shectman does not have the time to do this so AU will look into getting it done.
- Baade M3 turrent work
- The control computer was replaced on Baade and didn't work. Some crossed wires were repaired and it works. The ADC turrent does not turn, however, and Frank notes that the tertiary mirror has a different pulley pair and suspects a similar chage was planned but not made on the ADC turrent.
- Clay M3 turrent work
- Jose needs to implement clamping software (there are some tricky aspects on clamping and dealing with the servo system). Collimation testing was being done during this meeting; there's no data on clamp repeatability yet. For intervention observing, simultaneous 3-axis tertiary control is desired. This requires considerable software effort (but why not a fancier controller?-au). Estimate about 2 months for Jose Soto to implement this. Slower changes can be done with serial setting of the tertiary (maybe 15 minutes) and this is probably how we'll first test intervention observing.
- SAO visit during August Clay aluminizing run
- SAO will visit LCO to take measurements of the Clay rotator area with the tertiary mirror removed. They would like to know which date in the run to plan on using. Frank says day #1 is the best day. One extra day has been added to the aluminizing run to allow access. We expect Charlie Hull also on-site to work on this.
- LDSS upgrade
- It's looking like October 2004 is a target date for the LDSS upgrade. It depends on how the telescope schedule works out and if anyone needs LDSS time late in the year. AU understands that there is no mechanical problem with the LDSS shutter.
The question was asked whether or not LDSS was to be a facility instrument; AU had thought it was already considered a facility instrument, although it had never been declared so. There are electronics that are not mounted on the instrument (they're in racks next to the spectrograph), there is no heat control (there were plans for a plenum and fan), and there is no cable wrap. If a CryoTiger is planned, a cable wrap will be needed.
- New mirror support boards
- Acutators and translators. How many of each do we need?
- Data transport and storage
- The terabyte storage server was revived. Connections to DVD or USB disks would also make it a solution for data transport. AU will write a proposal.
- IMACS news
- Repair work update: One of the IMACS lenses did not need replacement for reasons unknown (it was definitely fogged before). Tyson and Bruce were able to do the long camera lens as well this trip. Tyson found some loose screws in the disperser system but it wasn't clear if that would've caused the problems reported. Tyson exercised the system and did not experience problems.
The LCO staff requested reviving the plan to have a system to safely insert and remove gratings. (This might be especially important with the new echellette? - au). LCO staff will have Tyson sketch a solution and deliver it to AU in Pasadena for discussion.
- Other discussion
- More communications and planning for engineering runs is needed. Although the recent IMACS engineering had a plan reported by Tyson and Bruce, new work, including a filter holder on a grism, was done that was not mentioned in the plan. The observatory staff would like to know about incidental work even if it's not the purpose of the engineering work.
- Frank would like to swap the priorities of the iodine cell automation and mirror coolant mixing valves.
- Longer stays by Pasadena engineers would be nice (something like a week to 10 days)
