[Dsg-hallb_magnets] Solenoid Load Cell rate of change during fast dumps and controlled ramps

[Ruben Fair]

Thank you Tyler. 

Very nice review and summary. 

Once again thank you and thanks to the team for putting in the effort to look at all this data. 

Regards 

Ruben 



From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org> 
Sent: Monday, October 29, 2018 4:58:33 PM 
Subject: [Dsg-hallb_magnets] Solenoid Load Cell rate of change during fast dumps and controlled ramps 

Hello, 

In addition to looking at the long term trends in Solenoid load cell (LC) data, I've looked at the LCs' rate of change for a few fast dumps and controlled ramps to zero. Attached is an Excel file containing the results. 

Sheets 1 and 2 contain data for fast dumps and controlled (purposeful) ramps of Solenoid when Torus was at full field. I could only find two occasions where there was a controlled ramp to zero of the Solenoid while the Torus remained at full field. The plots for the controlled ramp data aren't too insightful since there are only two data sets. 

Sheet 3 contains tables showing the average and standard deviation for overall change in LC reading, average and standard deviation for rate of change in LC reading, and a comparison between the averages for fast dumps and controlled ramps. 

The data show that for fast dumps: 


    1. The amount radial LCs change and their rate of change are constant for dumps since February 19, 2018. 
    2. The amount axial LCs change and their rate of change have not been constant over time. 
        * The overall change shows a trend that the axial LCs have changed less for more recent dumps than for earlier dumps. 
            * Also resulting in the trend that the rate of change is decreased over time for fast dumps. 
        * One notable exception is ZS86101US_BR_B. 
            * Overall LC change has varied by up to ~50 lbsf between dumps. 
            * Is it significant that ZS86101US_BR_B has been inconsistent in the amount it changes during fast dumps? 
For the controlled ramps to zero, 


    * all LC changes and rates of change appear to be pretty constant 
        * Plots may be misleading because I only found two data sets for when Solenoid had a controlled ramp while Torus was at full field. 

When comparing the overall LC change between fast dumps and controlled ramps: 


    * differences between overall LC change for fast dumps and controlled ramps seem to be insignificant 
        * Max difference was ~34 lbsf for RS86107DS_BL_B. 
        * From Dave's comments on long-term LC trends, a ~30 lbsf difference/change is not significant. 

In summary, the amount and rate that LCs change during a fast dump have been constant for the radial LCs, while Axial LCs. have showed more variation between fast dumps. The overall change in LC readings are the same, regardless if it is a fast dump or controlled ramp down. 

Best regards. 
Tyler 


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