[Dlsupport] A voice, crying in the wilderness

[David Douglas]

okay, so, looking back at the attached, I see 500 A gives 1.2 kG? So if 
it's completely linear we'd need 2083 A for 5 kg?

The concern here is that the optics solution depends very sensitively on 
the solenoid internal field - 1% deviation is likely significant, 10% 
error in field would be a serious issue. We can recalculate, but to 
validate the setup we'll need to run the solenoid at the same field as 
during the physics run. Do we have a way to measure the field in place? 
Do we know the excitation curve?

Again, guidance is welcome. Thanks

D



On 8/4/2016 2:33 PM, David Douglas wrote:
> Just read log entry
>
> https://logbooks.jlab.org/entry/3416301
>
> regarding solenoid. It recommends 2000A limit for this run.
>
> If this does not produce 5 kG field in the solenoid (which I thought 
> took order 5000A), it will blow away the optics solution: the beam 
> transport will be completely disrupted, in that both the betatron 
> match and the coupling compensation will be incorrect.
>
> Please advise.
>
> DD
>
>

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