GMPS Transductor Upgrades And Realtime B Field Measurement for Reference Magnet
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Transcript of GMPS Transductor Upgrades And Realtime B Field Measurement for Reference Magnet
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GMPS Transductor UpgradesAnd Realtime B Field Measurement for
Reference Magnet
Kent Triplett, Xiaolong Zhang
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Main Objectives
• Back up present system.• Improve the GMPS stability and accuracy.• Improve the B-dot stability and accuracy.• Methods:
Commercial Current Transformer UpgradeHall Probe Realtime B field measurement system
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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.
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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)
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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.
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Specifications - ITP Current Transducers
Electrical
Model Symbol ITP 2000-SPR ITP 2000-S/SP1
ITP 2000-SBPR Units
Former Danfysik Model STH-2000I STH-2000IHF STH-2000U
Polarity Bipolar
Secondary Nominal Current Isn ±1 ±2 - A
Nominal voltage output Max. output load current Max. output load cap.
Von
Io,max
Co,max- -
±1053
VmAnF
Ext. burden resistor max Ext. burden resistor min
Rb,max
Rb,min
1.50 - Ω
Ω
Transfer ratio (Ip/Is)N 2000 1000 - -
Transfer ratio (Ip/Vs)G - 200 A/V
Max nondestructive overload Min overload trip value
Ip,max
Ip,min5x
1.3x5x
1.3xIpn
Ipn
Offset - Initial - Drift vs. Temp. - Drift vs. Time
- <2<0.1<1
<2<0.6<1
ppmppm/°C
ppm/month
Transfer ratio - Deviation - Deviation vs. Temp. - Deviation vs. Time
- <4
<0.1<1
<50<2<2
ppmppm/°C
ppm/month
Linearity Deviation Linearity Deviation vs. Temp.
Xd
Xd,temp<2
<0.1<4-
ppmppm/°C
Output noise rms -<0.01<3.5<5.5
<0.01<3
<5.5
<0.15<5.5 <16
ppm,rmsppm,rmsppm,rms
Dynamic resp. slew rate Dynamic resp. delay time
dl/dttd
>20<1
TBDTBD
>20<1
A/µSµS
Bandwidth ±3dB f 0-50 0-300 0-50 kHz
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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.
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Specifications of Lakeshore 460
Product Price Total
Gaussmeter, 460, $5,975.00 $5,975.00
Two-axis probe: 8 in long $1,537.00 $1,537.00
Probe, metal transverse, 0.06 x 0.18 x 8 in
$598.00 $598.00
111
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Backup Slides
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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.
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Pros:$5575/unit.Used in the labat beam line.
Cons:4-6 weeks delievery
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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.
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Lakeshore 455 Single Channel
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Power Line Frequency Variation
At fermilab, D. Herrup using 60Hz±30 mHz forEstimation the need for cogging
From LeapSecond.com
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