[Dsg-hallc_controls] PT2026 Probe on HMS Dipole

[Brian Eng]

I've only been able to get the PT2026 to get a lock at the ~1.8T level when changing the RF Pulse parameters under the Advanced tab on the controller, but after doing it doesn't get a lock at ~1.4T unless I change them again.

I don't know if it's this particular probe itself, the location, etc; but as it is currently performing this wouldn't be a suitable replacement for the PT2025.

> On Sep 28, 2018, at 12:05 PM, Steve Lassiter <lassiter at jlab.org> wrote:
> 
> Hi,
> 
>  At higher fields, the probe ability to lock onto non uniform fields decreases. The allowable PPM is higher at the low range of the probe than at its higher range. 
> 
> Steven
> 
> From: "Brian Eng" <beng at jlab.org>
> To: "Steve Lassiter" <lassiter at jlab.org>
> Cc: "Jack Segal" <segal at jlab.org>, "Andrew Kenyon" <kenyon at jlab.org>
> Sent: Friday, September 28, 2018 11:50:45 AM
> Subject: Re: PT2026 Probe on HMS Dipole
> 
> Okay.
> 
> I'll see if there's any settings I can try on the controller that will allow it to get a lock.
> It could just be a matter of this not being the best probe and/or location for this particular task.
> Although it is surprising that it it could get a lock (and quite quickly too) just fine at the lower ranges but now it seems to have problems.
> 
> Not a big deal, this was just a parasitic test anyway.
> 
> ----- Original Message -----
> > From: "Steve Lassiter" <lassiter at jlab.org>
> > To: "Brian Eng" <beng at jlab.org>
> > Cc: "Jack Segal" <segal at jlab.org>, "Andrew Kenyon" <kenyon at jlab.org>
> > Sent: Friday, September 28, 2018 11:15:23 AM
> > Subject: Re: PT2026 Probe on HMS Dipole
> 
> > Hi,
> > 
> > No one has been near the new NMR probe or disturbed it or its cables. The HMS
> > detector hut has been shut since the hall was closed up as well.
> > 
> > Under no conditions should the new NMR cable be touched, moved or adjusted due
> > to its close proximity to the existing HMS NMR probes. One can not afford to
> > lose the existing NMR signals during an experimental run.
> > 
> > Thanks
> > Steven
> > 
> > 
> > ----- Original Message -----
> > 
> > From: "Brian Eng" <beng at jlab.org>
> > To: "Steve Lassiter" <lassiter at jlab.org>, "Jack Segal" <segal at jlab.org>, "Andrew
> > Kenyon" <kenyon at jlab.org>
> > Sent: Friday, September 28, 2018 9:54:30 AM
> > Subject: PT2026 Probe on HMS Dipole
> > 
> > I'm not sure if any of you will see this while you're in the Hall or have time
> > while working on Q3, but if possible could someone have a look at the newly
> > installed NMR probe?
> > 
> > It is still connected to the controller because I can read the probe
> > information, but it hasn't gotten a lock since Wed.
> > 
> > Just pulling it out and making sure nothing is damaged then sliding it back down
> > should be fine. Maybe put it in a slightly different location than it is
> > currently as well?