Gram-scale StarChip components | Power management

Jun 04, 2016 13:09 michael.million@sky.com Posted on: Centauri Dreams

If we can use the kinetic energy of the craft via magnetic coils or capacitance devices we will have no problems with energy needs, even at 4 grams there is an enormous amount of energy available.

Jun 05, 2016 10:50 michael.million@sky.com Posted on: Centauri Dreams

Perhaps we could have some sails dedicated to a special task say one for optical, one for the ISM, magnetic fields and one for relay communications between crafts and to and from Earth and so on.

Aug 01, 2016 13:47 Breakthrough Initiatives Posted on: Breakthrough Initiatives

In the vicinities of the Earth and of AC the solar sail could collect from about 20W (10 AU) to 2KW (1 AU) of power (see summary). It would take the nanosat about 14 hours to cover 20 AU near AC, thus enough time to transmit back to Earth.
A radioisotope power source would keep the nanosat in a safe, low functional mode during cruise, while possibly storing some energy in a battery.
Power is also imparted to the nanosat by the interstellar hydrogen (1 atom per cm3) in the form of 20 MeV protons and 10 keV electrons (see summary). The 15 nm solar sail does not stop either protons or electrons. 10keV electrons will stop in about 1μm of Al, while 20MeV protons will stop in 2 mm of Al (or 0.5 g/cm2).
The about 20mW power delivered by protons stopping in a 1 cm2 component, could be used to charge a storage device for periodic communications with Earth.

– Sasha Buchman, Breakthrough Initiatives

Oct 10, 2016 23:50 sda1950a@gmail.com Posted on: Breakthrough Initiatives

Power could best be provided by taping the electrical charge created by spacecraft charging. this phenomenon is usually a problem created by cosmic radiation impacting the S/C, but if the charge is isolated from the electronics and drawn off, it could power the S/C.

Nov 05, 2016 03:04 Breakthrough Initiatives Posted on: Breakthrough Initiatives

RE:
"Oct 10, 2016 23:50sda1950a@gmail.comPosted on: Breakthrough Initiatives
Power could best be provided by taping the electrical charge created by spacecraft charging. this phenomenon is usually a problem created by cosmic radiation impacting the S/C, but if the charge is isolated from the electronics and drawn off, it could power the S/C."

Answer:
This approach has never been used but it has significant merit. A preliminary scientific discussion of this idea can be found at the paper available at https://arxiv.org/pdf/1608.05284.pdf
There are practical problems related the isolation systems. Also, charging in deep space has rarely been measured and the ability to design such a system is not well understood. Significant trades will need to be performed to find the best way to harvest energy for the StarChip.

- Avi Loeb, Breakthrough Starshot

Jan 07, 2017 20:20 michael.million@sky.com Posted on: Centauri Dreams

I find the needle like probe, '1sq cm' more problematic than a thin disc profile of 1 sq cm, at least with the edge on disc heat and sputtered material has an escape route to the sides limiting damage, shallow angle deflection also aids the craft especially if the edge is very sharp.

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