Hi Brad, Given it's a balloon payload, what are your mass constraints? Conductive cooling is going to involve throwing metal at the problem, possibly a lot of metal...
-Francois On Tue, Apr 16, 2013 at 12:57 PM, Steve Maher <stephen.f.ma...@nasa.gov>wrote: > Heatpipes and dunking <http://www.pugetsystems.com/submerged.php>in > liquid (e.g. mineral oil) are options we've explored (with PCs), although > we seem to be favoring pressure vessels at this point. > > Steve > > > On Tue, Apr 16, 2013 at 2:34 AM, Jason Manley <jman...@ska.ac.za> wrote: > >> I don't know of anyone who's actually done this, but we do also have a >> passive-cooled concept for our new digitiser board (loosely based on >> ROACH2). We've been thinking about a prototype that'd essentially be >> turning a ROACH2 board upside-down and bolting it onto a giant metal plate >> that's been appropriately milled out of a solid chunk of alu. The FPGA, >> PPC, QDR and other hot bits would make contact with the plate and use it as >> heatsink. The other high-profile parts (RAM DIMM, for example) needs holes >> or cavities milled out the alu. >> >> I think Vaughan (cc'd here) might have some mechanical drawings of ROACH2 >> with the holes and things in the appropriate place. It might help you get >> started. He could also provide some CFD models and heat load measurements >> of the various components. >> >> Jason Manley >> DSP Specialist >> SKA-SA >> >> Cell: +27 82 662 7726 >> Work: +27 21 506 7300 >> >> On 15 Apr 2013, at 20:29, Brad Dober wrote: >> >> > Dear Casper Collaboration Members, >> > >> > My name is Brad Dober, and I'm a grad student at UPenn working on a >> ROACH-based MKID readout for a balloon payload. At our float altitude, >> air-cooling the ROACH and ADC/DACs isn't feasible Has any other group >> looked into or even designed a conduction-cooled system for .either the >> ROACH1 or ROACH2? >> > >> > Any leads would be extremely helpful. >> > >> > Sincerely, >> > >> > Brad Dober >> > Ph.D. Candidate >> > Department of Physics and Astronomy >> > University of Pennsylvania >> > Cell: 262-949-4668 >> >> >> > -- Francois Kapp Sub-system Manager Digital Back End meerKAT SKA South Africa Third Floor The Park Park Road (off Alexandra Road) Pinelands 7405 Western Cape South Africa Latitude: -33.94329 (South); Longitude: 18.48945 (East). (p) +27 (0)21 506 7300 (p) +27 (0)21 506 7360 (direct) (f) +27 (0)21 506 7375 (m) +27 (0)82 787 8407
