Date: Sat, 27 Mar 2010 09:25:33 -0400 From: Eric S Harmon Subject: Re: Daughter board -- revised schedule As I see it, we have the following tasks to get everything done: 1. Finish the linear array: Expected in the next couple of weeks. 2. Test the linear array -- expected by the end of April 3. Get the daughter card -- needed by the end of April, if at all possible 4. Wire bond -- May 5. Put daughter card into mother board & Test: May -- June 6. Assemble complete system: June 7. Software to readout spectrum -- we need to put some work into this as well. Finally, as to detectors for X-rays rays: I don't remember all of your specs, but we should have the following available soon: 1 mm x 1 mm device -- lots of variations 2.5 mm tall, width variable (1 mm -- 10 mm easily): Basic variation is 25 um wide x 2.5 mm tall pixels, repeated across the array. 3.0 mm x 3.0 mm: limited variations, though we can do things like quadrant detectors and 3 x 6 mm, etc. 4.0 mm x 4.0 mm: similar to the 3.0 mm x 3.0 mm devices As to transit time spread: our analysis puts the transit time spread of an individual SPAD down below 30 psec, but arrays will have additional TTS due to skew. We have some structures to correct skew across the larger (3.0 mm & 4.0 mm arrays), but we do not yet know how well they will work). TTS across the 25 um x 2.5 mm pixels is expected to be in the range of 50 psec, though some parasitics & ringing may slow this down. It is likely that we will need to do some post processing tweaks to get the fastest possible speed (which would delay some availability until this summer). Eric