On 12/31/12 8:13 AM, Magnus Danielson wrote:
On 31/12/12 16:56, Bob Camp wrote:
Hi
I suspect that your ion standard will have some issues from magnetic
field. Quartz it's self has no magnetic sensitivity. Most atomic
gizmos have sensitivity as part of their basic physics.
All atomic clocks that I know of have this sensitivity.
One strategy is to look at the side-band features and steer the C-field
accordingly. The dynamic range needed after my-metal shield(s) might be
something to consider. Helmholtz coils might be applied, as it has been
in early stages of research.
I'm sure they're thinking of all this..
Typically, the requirements set for something like this are the union
(and superset) of all previous devices which they supersede (USOs in
this case), so they'd probably want the magnetic field influence to be
less than it is for USOs.
The Hg-ion trap isn't so much the challenge as getting it all built and
packaged in a space qualifiable way. And meeting the 1 kg/1 liter target
mass/volume. It's taken a few years to get from "physics package
demonstrated as prototype on benchtop" to "physics package manufactured
as a product with full drawings, processes and decent yield" and I
believe the current work for the past couple years is more on getting
all the supporting electronics (electro optics, RF, HV power) also in a
form that is manufacturable and qualifiable.
We all joke that getting your widget working on the bench is about 10%
of the cost/time/work to getting it ready for space flight, but it's not
that much of a joke.
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