[dsg-hdice] NMR averaging and standard deviation

[Amanda Hoebel]

Hi Xiangdong, 

To summarize what we discussed in the lab: 

1. The data files are on the computer's C: drive in the same directory as the other rack (Rack #2). For the data files of the latest 10 cycles and 1,000 cycles, the forth column in the average value file is the standard deviation. 

2. We do not know what is causing the computer crashes (the one you observed and the one we saw earlier in the lab); however, since nothing was running on the computer when the crashes happened, we believe the problem is with the computer itself and may need to be sent to the computer center if the crashes continue to occur. Connecting the computer to the network for any new updates might solve the problem. 

3. You will need to speak with the computer center regarding an HDIce group login account and general settings. For the settings, you should request that the computer accounts be set to "never sleep". 

Regards, 
Amanda 





From: "Xiangdong Wei" <xwei at jlab.org> 
To: "Amanda Hoebel" <amandah at jlab.org> 
Cc: dsg-hdice at jlab.org 
Sent: Tuesday, August 14, 2018 10:57:45 AM 
Subject: Re: [dsg-hdice] NMR averaging and standard deviation 

Hi Amanda, 

Thank you very much for the message, I'll start playing the new rack with the CT-Box. Could you please send the data file for the two attached plots so I can do further analysis? As soon as we cool down the PD-I (in ~1 week), I will measuring the NMR the new rack. 

There is one setback: 

When preparing the PD-I in HDice lab yesterday morning, I noticed that the display of control computer on the new NMR rack was black. After stroking the SHIFT Key, the infamous Windows Blue Screen shown up, indicating a computer crash (see the attached picture IMG_3503). 

As you mentioned 2 weeks ago, this computer requires the smart card to login (see attached picture IMG_3504), so I'm stuck and need your help. 

Would you please: 
1). Investigate what caused the crash? 
2). Change the login settings to USING PASSWORD, so we (the HDice group) can get access to the computer all the time, especially in the night, weekends and holidays, to measure the target polarizations while on shift? Given the long and complicated target production process, the reliability and accessibility of the NMR rack are extremely important, which sometimes can become the only factor for saving the target. 

Thanks again for the efforts you and the DSG group spent on this project, we will always count on your support. 

Best regards, 

Xiangdong 


Xiangdong Wei 

x-5266 


From: "Amanda Hoebel" <amandah at jlab.org> 
To: dsg-hdice at jlab.org 
Sent: Monday, August 13, 2018 2:05:37 PM 
Subject: [dsg-hdice] NMR averaging and standard deviation 

Hi Xiangdong, 

Averaging was implemented for the CT-box field values in the NMR program and is ready to be tested. The program was run for 1,000 cycles and the standard deviation of the field values was analyzed. Attached is a zoomed-in picture of a part of the average field values, showing the respective points' standard deviation over the 1,000 cycles. The average standard deviation was 0.55 G. 

Regards, 
Amanda 

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