[dsg-hdice] Fwd: The status of testing newHDice NMR rack

[Peter Bonneau]

Hi Xiangdong,

Amanda will be requesting a meeting with you so we can discuss the test 
results.

We have a few initial comments regarding the test status report.

1) We're glad the noise results look promising (slides # 3-7). We have 
some questions regarding the measurements that we can talk about in the 
meeting.

2) Regarding the the Fast Resonance scanner program mentioned on slide 
#8, DSG did not know about the existence or need for this program before 
our meeting on Nov 8th. DSG is now working on the update of this program.

3) On slide #9, the issue of synchronized field value logging is 
mentioned. The addition of synchronized field value logging was not 
requested as part of DSG's original HDice task list.  To add this new 
feature, a triggering source will be required. Triggering can come from 
any hardware source that can accurately synchronize the lock-in amp and 
field data acquisitions.

HDice requested in the original task list that a high accuracy current 
shunt be found and integrated into the NMR program. The purchase of the 
CT-Box was approved by HDice and it has been integrated into the NMR 
program.  However, that does not mitigate the need for synchronized 
field value logging which is a new task.

DSG has been investigating with CAENels the possibility of adding a 
hardware triggering output to the CT-box. If this can be implemented, it 
can be used to trigger the lock-in amplifier satisfying the hardware 
need to synchronize the acquisitions. However, extensive changes to the 
NMR program will needed to implement synchronization. This NMR 
programming effort has not started.

4) The program issues with the field scan mentioned on slides #10 - 11 
is most likely due to the lack of acquisition synchronization which is 
inherent in the original NMR program before DSG worked on it.

5) The timing issue shown on slide #12 is due to the requirement in the 
NMR program that T(down) must equal T(up) and  that T(bott) must equal 
1. This was inherent in the original NMR program before DSG worked on 
it. The program modification to allow variable values for T(down), 
T(up). and T(bott) was not requested.

DSG will be happy to work on these additional tasks. We can talk about 
this work during the meeting Amanda will be requesting.

Regards,
Peter




-------- Forwarded Message --------
Subject: 	[dsg-hdice] The status of testing newHDice NMR rack
Date: 	Mon, 5 Dec 2016 18:50:59 -0500 (EST)
From: 	Xiangdong Wei <xwei at jlab.org>
To: 	Amanda Hoebel <amandah at jlab.org>, dsg-hdice at jlab.org



Hi Amanda,

The attached pdf file is a status report of testing the newly built 
HDice NMR rack. It took a few more days than I said because I wanted to 
make sure that the information were correct. Thanks for being patient.

Best regards,

Xiangdong

/*Xiangdong Wei*/

//x-5266

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