1. Status of MB Data Retrieval
FIDEL Meeting
Nicholas J. Sammut
With several contributions from
L. Bottura, S. Sanfilippo, L. Deniau, D. Sernelius, C. Yao, A. Basu
22nd February 2007

2. Outline History Standard Magnetic Measurement problems
Data Analysis Problems
Examples of wrong measurement data
Analysis Procedure
Results
22nd February 2007
Status of MB Data Retrieval

3. Standard Magnetic Measurements
Performed using Rotating coils in SM18
Machine cycle
Loadline
Decay
- Hysteresis loop
22nd February 2007
Status of MB Data Retrieval

4. History
2002 to 2005 – Standard Magnetic Measurement Analysis using semi-automatic system (manual and excel macros); data analysis targeted at filling in ID Cards  Focus was mostly on measurements at injection and at nominal current, TF ramp-up, components (integrated and local).
2006 – For FIDEL, full cycle verification required to enable modelling.
This prompted a re-iteration of all the analysis of MB data set.
Hurdle - Previous problems encountered in manual data analysis were not logged.
- Many magnet specific problems and different combinations of hardware/analysis problems to be taken into account
- Some cycles were hard to identify
- Limited time and resources
Solution - To increase efficiency, full automatic MB data analysis system designed, tested and implemented. Includes a logging system and a quick viewer. Allows data analysis and retrieval in one-shot.
22nd February 2007
Status of MB Data Retrieval

5. Standard Magnetic Measurement Problems
Mechanical Problems: broken shaft
Electrical Problems: damaged ribbon cable, damaged connection
Electronic Problems: amplifier drift, amplifier gain, over-range
Measurement Set-up Error: wrong coil calibration factors
Operation error: error in cycle settings, error in data entry
22nd February 2007
Status of MB Data Retrieval

6. Data Analysis Problems
High deviation (larger than 6 units) of main field (at least one sector) compared to integrated – 80%
Erroneous data from connection of sector of a shaft – 10%
Erroneous data from inverted connection of sector – 5%
Incomplete measurement – 5%
Gain Shift in TF – 35%
Problems with gain at 1500, 2000A – 30%
Wrong Data entry by operator (temperature, magnet name) – 4%
22nd February 2007
Status of MB Data Retrieval

7. Shift in TF due to Gain Problem
Example of Problems
Shift in TF due to Gain Problem
22nd February 2007
Status of MB Data Retrieval

8. Incomplete cycle and erroneous points during measurement
Example of Problems
Incomplete cycle and erroneous points during measurement
22nd February 2007
Status of MB Data Retrieval

9. Analysis Procedure Identify correct cycle Extract Data
Identify erroneous sectors (delete or correct)
Fill in log file
Identify wrong points during cycle (delete or correct)
Extract data
Fill in Log file
Check all hysteresis cycles and compare to the whole population
Final cross check correct cycle with semiautomatic results (still to be done)
22nd February 2007
Status of MB Data Retrieval

10. Depending on number of problems encountered Possibly: end of March
Results
Cleaned Data - Loadline: 417 apertures Machine Cycle: 406 apertures
Still to do:
Machine Cycle final check and correction
Apply shifts to the TF gains for currents lower than 5000A (35%)
Identify correct coil configuration of 4 magnets
Final cross check between old semi-automatic results and fully automatic results
Ready end of Feb
Depending on number of problems encountered Possibly: end of March
22nd February 2007
Status of MB Data Retrieval