[Dlsupport] [ 1433] A voice, crying in the wilderness

[Dave Douglas]

Thanks! We're in the ballpark then...! 
Steve, or anyone, is there a field diagnostic in place to get the value?
Thanks, DD 


Sent from my Verizon Wireless 4G LTE smartphone

-------- Original message --------
From: Ross Corliss <rcorliss at mit.edu> 
Date: 08/04/2016  2:47 PM  (GMT-05:00) 
To: douglas at jlab.org 
Cc: felman at jlab.org, Christopher Tennant <tennant at jlab.org>, darklight <darklight at mit.edu>, dlsupport at jlab.org 
Subject: Re: [  1433] A voice, crying in the wilderness 

I dug up an old excitation curve from the magnet's previous experiment (page 24 of the attached), but it's definitely not precise enough for this task (though it verifies that ~2kA = ~5kG).

-Ross


> On Aug 4, 2016, at 2:42 PM, David Douglas <douglas at jlab.org> wrote:
>
> 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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