[Libre-silicon-devel] OK. That happened (Funding)

Éger Ferenc eegerferenc at gmail.com
Fri Nov 20 19:33:02 CET 2020

Hello Everyone,

The concept of liquid cooling may work, but three things need to be
- Workplace-safety managers of fabs may freak out on using conductive
saline solution in a mains-powered equipment (sealing failure may result in
shock hazard)
- Yet more freakout may come from why do we want to introduce sodium-rich
coolant into the cleanroom (sodium is a potent contaminant)
- Tubing must be made in such way not to compromise compatibility to
existing equipment (as the doc states, the idea is to make our
"self-emissive programmable photomask" useable on existing equipment
without modifications, so regular masks and SEPP can be swapped in-and-out)

Based on it, I recommend using DI water, possibly with glycol if subzero
temperature is needed, as coolant medium.


On Fri, Nov 20, 2020 at 9:11 AM ludwig jaffe <ludwig.jaffe at gmail.com> wrote:

> Hi all,
> thats very good news, so no need for dlp (mems mirrors) and mechanics.
> "
> Technical problems to be solved with this arrangement are:
> a) The imaging unit is expected to generate considerable amount of
> heat (6.25cm2 with 1300mW/cm2 intensity output and 2.7% WPE is approx.
> 300W power consumption, most of which is dissipated), resulting in
> considerable thermal expansion, that needs to be managed (cooling, or
> using low-LCTE materials).
> b) Power supply and data connections need to be implemented without
> jeopardizing mechanical compatibility.
> 6. Conclusion and open points
> The use of JBD's AMuLED display as maskless lithography pattern source
> is not infeasible outright.
> Points to be further evaluated:
> - Effect of incoherent illumination on projection optics
> - Evaluation on JBD side if they want to develop a 2.5x2.5cm unit for us...
> - ... and How Much Does It Cost?
> - Defect density - mitigation or enhancement
> - Feasiblity analysis of the proposed integration on INL/LS side
> - Thermal management and electrical connection
> "
> Here I would like to suggest to add a aluminium or copper plate to the
> backside of the
> display-chip.
> The plate has small etched trenches, and is covered by another plate
> without trenches.
> Both plates are glued together or friction welded together in a way
> plate heat exchangers
> are manufactured.
> Pressurized water/salt mixture at -10C is pumped through the trenches
> to cool the chip
> in order to reduce expansion. A compressor based freezer cools the
> liquid and a high pressure
> pump (gear pump) will provide for a continuous flow without high
> pressure variations
> which would cause inaccuracy. Also the pump driven by a strong stepper
> motor can be modulated to run only in times when the display is
> switched off, so you get a duty cycle
> of operation and cooling. The mass of the coolant and the metal can
> absorb heat pulses.
> ---
> Cheers,
> Ludwig
> On 9/14/20, David Lanzendörfer <leviathan at libresilicon.com> wrote:
> > Hi folks
> > So on Wednesday, 10 am Portuguese time, I'm having a ZOOM conference
> > with the other folks of the Photonics lab at INL, where I'll be showing a
> > presentation I'm right now tinkering together.
> > The goal is to use LibreSilicon in combination with their Integrated
> > Photonics, in order to build neuromorphic chips.
> > By becoming part of Jana's research project (she's a professor for
> photonics
> >
> > at INL), she and I can make LibreSilicon part of the university projects
> > which
> > would make it subject to direct EU funding.
> > Just a heads up.
> >
> > Cheers
> > -lev
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