[Dsg-hallb_magnets] Question regarding current fastDAQ data from Solenoid fast dump on Sept 13, 2017

[George Biallas]

Folks, 
I think these spikes are an artifact of the local measurement and are not really going through the magnet. 

As I read the graph, each division is 0.002 s. 

The linear portion of the largest spike takes place over ~0.0004 s. 

The current rise during that time is ~22 A. 

That calculates to a dI/dt of 55000 A/s. 

The voltage to drive that spike through the magnet inductor of 5.89 H is L*dI/dt. 

I calculate 323,950 V !!! 

I don't think that voltage is available. 

| From: "Tyler Lemon" <tlemon at jlab.org>
| To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>
| Sent: Thursday, September 14, 2017 9:21:44 AM
| Subject: [Dsg-hallb_magnets] Question regarding current fastDAQ data from
| Solenoid fast dump on Sept 13, 2017

| Hello,

| This morning, Pete Bonneau and I were looking at the fastDAQ data Brian and
| Pablo sent yesterday of the ~1 second where the fast dump happened in the
| Solenoid.

| We noticed that the current jumps ~15A and then decays several times at the very
| start of the ramp down (plot attached).

| We think that these oscillations are caused by the dump switch flipping. Is this
| the cause of these oscillations? If not, what is causing the current to jump
| like that at the start of the fast dump?

| Please let us know.

| Best regards,
| Tyler

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-- 
George 
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