1. GMPS Transductor Upgrades And Realtime B Field Measurement for Reference Magnet Kent Triplett, Xiaolong Zhang

2. Main Objectives Back up present system. Improve the GMPS stability and accuracy. Improve the B-dot stability and accuracy. Methods:  Commercial Current Transformer Upgrade  Hall Probe Realtime B field measurement system

3. Transducer Original Designing The transducer in the in booster reference magnet measures the excitation current to the gradient magnets and thus regulate the GMPS system for the B:Imax and B:Imin. The original designing was a current transformer of 1200A with a output of 1245A/10V. It’s essential to Booster operation.

6. Evolution of Current Transducer The transducer system was upgraded a few times to present of water cooled 7500A transductor and relatively new electronics of 7500A/43V. The resolution and accuracy of the system is unknown. There might be 720Hz noise signal present. (“In order to reduce the transmission line mode excitation, the power supply have been designed as 12-phase supplies with a basic ripple frequency of 720Hz” TM-405)

7. Proposed Upgrades Since it’s critical for Booster operation, and it looks like we don’t have the spare, the backup or upgrade of the system is needed. There are a few commercial current transformer readily available with modern electronics from Hitec, LEM/Danfysik and ZES. Their specification (0 - 50KHz):  Accuracy: < 3 ppm  Output noise: < 6 ppm Advantage of the upgrade:  Improve the accuracy of the GMPS current monitoring.  Better for the feedback/feedforward system.

8. Specifications - ITP Current Transducers Electrical ModelSymbol ITP 2000-SPR ITP 2000- S/SP1 ITP 2000- SBPR Units Former Danfysik Model STH-2000ISTH-2000IHFSTH-2000U PolarityBipolar Secondary Nominal CurrentI sn ±1±2- A Nominal voltage output Max. output load current Max. output load cap. V on I o,max C o,max -- ±10 5 3 V mA nF Ext. burden resistor max Ext. burden resistor min R b,max R b,min 1.5 0 -Ω Transfer ratio (I p /I s ) N 20001000- - Transfer ratio (I p /V s ) G - 200A/V Max nondestructive overload Min overload trip value I p,max I p,min 5x 1.3x I pn Offset - Initial - Drift vs. Temp. - Drift vs. Time -<2 <0.1 <1 <2 <0.6 <1 ppm ppm/°C ppm/month Transfer ratio - Deviation - Deviation vs. Temp. - Deviation vs. Time - <4 <0.1 <1 <50 <2 <2 ppm ppm/°C ppm/month Linearity Deviation Linearity Deviation vs. Temp. X d X d,temp <2 <0.1 <4 - ppm ppm/°C Output noise rms- <0.01 <3.5 <5.5 <0.01 <3 <5.5 <0.15 <5.5 <16 ppm,rms ppm,rms ppm,rms Dynamic resp. slew rate Dynamic resp. delay time dl/dt t d >20 <1TBD A/µS µS Bandwidth ±3dBf0-500-3000-50kHz

9. Realtime B Field Monitoring By measuring the B field during the cycle, we’ll be able to measure the optics more accurately. It’ll give us another instrument for B-dot system backup. Give more data for booster modeling and beam dynamics studying. The available commercial product of Lakeshore 460 3-axial Gaussmeter will be a good option.

10. Specifications of Lakeshore 460 ProductPriceTotal Gaussmeter, 460,$5,975.00 Two-axis probe: 8 in long $1,537.00 Probe, metal transverse, 0.06 x 0.18 x 8 in $598.00

12. Backup Slides

13. Benefits of These Upgrades We could measure the real time main B field and gradient. Build a better GMPS feedback/feedforward system (might be 4 additional 20A current feedforward system). Improve the B-dot timing system to better synchronize the beam transfer and other beam diagnosing.

15. Pros: $5575/unit. Used in the lab at beam line. Cons: 4-6 weeks delievery

16. PSU1000HF: $2615 each. This requires +/- 15 V power supply. If connecting to one of our power analyzers, we have cables made to provide this supply. SAT2000: $7699.00 each. Includes transducer head, power supply and cabling up to 30m. Both are in stock in up to 10 pcs.

18. Lakeshore 455 Single Channel

19. Power Line Frequency Variation At fermilab, D. Herrup using 60Hz±30 mHz for Estimation the need for cogging From LeapSecond.com