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MUSTANG Green Bank Team Meeting 10-Jun-08

• Attendees
• Agenda
• Science
• Updates to MUSTANG work 4/1/08 – 10/1/08
• Cleo interface meeting

Attendees

• Mason, White, Woody, Creager, Whithead, Bloss

Agenda

• Status:
  • Science
    • Data from past observations
    • Proposals
    • New array(s)
    • Prep for next observing season
    • Other (new optics)
  • Hardware
    • Power supplies
    • Moving ‘Spider’ into enclosure
    • Vibrational mitigations
    • Test/spare pulse tube
    • Ventilation
    • Documentation
    • Other
  • Software
    • Cryogenics/housekeeping
    • Data Monitoring
    • Interfaces (Cleo/Astrid)
    • Testing
    • Other
• Issues/Concerns
• Next Steps

Science

• • Work has focused on data reduction with Phil taking the lead and Paul working with IDL and Obit along with Bill. Six proposals were received for 'shared-risk' observing this fall/winter season.

Updates to MUSTANG work 4/1/08 – 10/1/08

Updates on those items with Green bank involvement

• Arrays:
  • Array #3, which could improve sensitivity by 2x which will help for faster observations, is slated to have final assembly steps completed in the next few weeks, we hope.
  • Array #4 remains at NIST and the final size is unknown, 256 is a possibility, but 64 is more likely.
  • Proposal in development for NSF to fund creation of a 256 or potentially a 1,000 pixel array. This would result in a change to the hardware, multiplex electronics, maybe the MUX electronics (SCUBA-2 system), and will stretch the data monitoring capabilities of the manager.

• Software development - Drop of housekeeping/cryogenic manager code planned for 19-Jun. (MB: updated from 16-Jun). Data monitoring meeting to be conducted with Brian/Ray. Determined row sequencing.

• Review and analysis of the air circulation issues/donut air circulation improvement – This will be evaluated after the other donut work is complete; probably in September.

• Separate tower and crate into separate remotely controllable power supplies – Awaiting the last remaining pieces for the test supply. Both supplies will fit into a single chassis and can be controlled at several levels, including down to the individual voltage output. These supplies are able to stage the AC Mains on/off from the output(s) on/off which will eliminate the ringing and noise seen on the existing supply (which is controlled by AC Mains only). It is proposed that this clean application of voltages to the electronics will eliminate or at least greatly mitigate the problems experienced with crate instability last winter. At this point, little or no changes (beyond a second power command) are anticipated for the manager, although this could be something to revisit later on. After full testing in GB, power supply will be shipped to UPenn where it will be tested on hardware and output 'on' sequencing determined through empirical testing.

• Procedures & requirements for operating the pulse tube cooler on the GBT (eg, our special compressor; cold trapping the lines prior to the run etc) – A test dewar with spare pulse tube being fabricated in GB lab. Not in critical path for anything related to fall deployment, but may be used to cold trap lines before MUSTANG installation. May also be useful for lab tests of vibration issues at lower elevations.

• Procedures for maintaining the fibers in the wrap that we use to get data to the DAQ computer. – Expect to mitigate with relocation of Spider (or replacement) into enclosure with crate

• DAQ computer installation & removal procedures; receiver installation and removal. – Assuming successful relocation of the power supply, sufficient space is gained to mount the computer. Spider may be relocated or a new computer ordered to replace Spider. Order for new computer (if any) will take place late in summer to get latest feature/capability set. (I don't understand this-- have spider, and trigger which is faster than it... since we're able to go with 4U in the crate now I don't see a reason to be thinking about a new computer-- maybe I've forgotten something -- BSM 18jun08)

• Documentation – Greatly improved with the documents placed on the wiki by Simon. Still missing some Goddard/NIST documents and tower firmware documentation.

Cleo interface meeting

• Mason, Maddelena, Creager, Whitehead, Bloss
  • Participants discussed what parts of the existing Cleo nomenclature and command structure could be utilized with MUSTANG. Some items looked encouraging, but all agreed more discussion was needed. Group did agree to change MUSTANG Cal Diode Control from "Ton/Toff" to "Ton & duty cycle". Ray to update MR and resubmit to CCC
  • Cleo on Spider at UPenn may be an issue. Cleo is not part of manager and utilizes specific libraries. Issues with version control as well. A local version of the manager is needed for Cleo development. Ray asked for notice before development begins to merge two concurrent development branches.
  • First iteration of Cleo due by end of June; second iteration by end of July

-- MartyBloss - 12 Jun 2008