<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000'>Hi All,<br> <br><!--[if gte mso 9]><xml>
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<p class="MsoNormal">The need for NMR field regulation units:</p>
<p class="MsoNormal"><span style=""> </span>Setting
the dipoles by current mode gives a regulation of 10ppm. There is also
a long wait time at the end of current ramping for Eddy currents to decay. <span style=""> </span>Using NMR field regulation provides regulation
of the order 0.1 ppm, 100x times better than just current mode. <span style=""> </span>The NMR also provides a much quicker stabilized
field as the NMR can compensate for the Eddy current decay by continually adjusting
the PSU current. Both of these factors are important in running experiments
within Hall C.</p><p class="MsoNormal"><br></p>
<p class="MsoNormal">The need for standardization:</p>
<p class="MsoNormal"><span style=""> </span>Originally
the HMS magnet controls started out as being part of the magnet contract and
each magnet vendor had their own unique controls system. <span style=""> </span>The magnet’s controls along with the spectrometer’s
rotation and the Halls cryo controls were later combined into a single commercial
available, redundant process controlled PLC. <span style=""> </span>Repairs, modifications and adding new systems can
be done by more engineers and techs other then just by a few system experts by
using industry standard PLCs. <span style=""> </span>Long term
technical support and product availability over 20+ years are also key considerations. These PLCs and their components have been tested and nearly all (exception is controlnet) work in the Hall's environment.<br></p><p class="MsoNormal"><br></p>
<p class="MsoNormal">Why a new generation NMR unit:</p>
<p class="MsoNormal"><span style=""> </span>A few
of the disadvantageous of the standard 2026 NMR unit is the need for a large
number (7) of (large sized) probes to cover the field excitation range of the
Spectrometer’s dipole magnets. These probes also need to be located in a region
where the field gradients are tight in order for the unit to “lock” unto a
signal.<span style=""> </span>The demand for a flat field
region and the volume required to house the 7 probes and not be a source of multiple
scatter or be seen by the detectors is a challenge that has not been fully meet
yet. The current configuration calls for up to six probes to be installed at
one time. This limits the excitation range that an experiment can do before the
probe assembly has to replace a lower range probe <span style=""> </span>with a higher range probe. <span style=""> </span>Reproducibility is comprised in doing this and
finding the sweet spot of the magnet’s field is extremely hard at higher
excitation as the Iron yoke becomes saturated. Also there is difficulty in
replacing the probe bundle due to the highly restricted access to the area and
being able to adjust the position of the probes while staying out of a high
magnetic field. <br>
<span style=""> </span>GMW has come out with a
new generation NMR field probe and controller that covers the entire dynamic range
of the Dipole magnet and is more tolerant of field gradients. A single unit was
purchased to be tested by Hall C and the unit performed well with the exception
of two features: changes to how the unit communicates to external devices and the
lack of ability to control the PSU’s current directly. </p><p class="MsoNormal"><br></p><p class="MsoNormal">Path forward:<br>
<span style=""> </span>Establishing a means of getting
the new NMR unit to communicate with the PLC needs to be addressed and solved
before the second problem is tackled. Using existing means of communication (RS323, MODBUS) is desirable as this has proven to be functional in the hash environment
conditions within the hall. The vendor does not plan on implementing this option (in the forseeable future). Other means such as USB or Ethernet will have to be developed between the NMR and the PLC. After communications is established, then a
means to get the NMR to regulate the PSU‘s current, either through the NMR or
by a PLC routine has to be solved. Once these two problem areas are resolved,
then a second unit and probe should be procured (~$30k) for the SHMS magnet.<br><span style="white-space: pre;"> </span><br><span style="white-space: pre;"> </span>One fall back is to continue using the older models NMRs with limited probe/excitation capabilities. Another plan is the development of a external field shunt attached to the magnets to house the older NMR probes.<br></p>
<br><br>Steven<br><hr id="zwchr"><div style="color: rgb(0, 0, 0); font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"Cynthia Keppel" <keppel@jlab.org><br><b>To: </b>"Mike Fowler" <fowler@jlab.org>, "Brian Eng" <beng@jlab.org><br><b>Cc: </b>"dsg-hallc controls" <dsg-hallc_controls@jlab.org><br><b>Sent: </b>Friday, June 8, 2018 6:04:50 PM<br><b>Subject: </b>Re: [Dsg-hallc_controls] NMR - PLC Interface<br><br>Hi Mike, Brian, <br><br>I think I need more input... will the cost for one option be the ~$70 x 2 for implementing the Python modules as Brian is suggesting, with the ~$30k for new NMR units the cost for a different option - or are these two the same thing?<br><br>Help!<br><br>Thanks,<br>Thia<br><br>----- Original Message -----<br>From: "Mike Fowler" <fowler@jlab.org><br>To: "dsg-hallc controls" <dsg-hallc_controls@jlab.org>, "Cynthia Keppel" <keppel@jlab.org><br>Sent: Friday, June 8, 2018 4:22:38 PM<br>Subject: Re: [Dsg-hallc_controls] NMR - PLC Interface<br><br>Hi,<br><br>It is my opinion that the need for this project should be reviewed and <br>possibly delayed until such time that the NMR vendor has resolved the <br>communication problem.<br><br>Currently the HMS dipole older NMR unit covers most of the dipole <br>operating range, and regulation by current appears to be sufficient over <br>that range. The SHMS Dipole is currently regulated by current which may <br>be sufficient for the near future.<br><br>I believe having additional hardware and software external to the PLC <br>that is subject to failure is not an ideal solution. Implementing the <br>new NMR units for the SHMS also comes with an additional investment of <br>about $30K. Without a reliable solution I question the current need to <br>proceed.<br><br>Steve and Thia please comment.<br><br>Regards,<br>Mike<br><br><br><br><br>On 6/8/2018 1:05 PM, Brian Eng wrote:<br>> Since there is currently no direct way to interface the new NMR with the PLC (MODBUS would work, but is at least 1 year away according to the vendor) and none of the existing devices used by Halls B/D will work we're going to need to develop something ourselves.<br>><br>> Despite the communication issues discovered with the NMR (that the vendor is aware of and working on) the proof-of-concept of using Python modules as a go between the devices showed it could be a viable solution.<br>><br>> The next step would be to order the hardware that would run this. The plan is to use a small SBC that runs Linux, I was hoping to order through webstock but I couldn't find any newer models. So we would need to use a PCard for the order.<br>><br>> Each board/setup would be ~$70 and we'd like to order at least two of them.<br>><br>> Is there someone in Hall C that normally handles PCard orders or should we just place the order ourselves using COPS.PHALLC?<br>><br>> Thanks<br>> --<br>> Brian Eng<br>> Detector Support Group<br>> 757-269-6018<br>> _______________________________________________<br>> Dsg-hallc_controls mailing list<br>> Dsg-hallc_controls@jlab.org<br>> https://mailman.jlab.org/mailman/listinfo/dsg-hallc_controls<br><br>_______________________________________________<br>Dsg-hallc_controls mailing list<br>Dsg-hallc_controls@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/dsg-hallc_controls<br></div><br></div></body></html>