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Magnet field testing
Kevin Tilley, Paul Flower, Mark Rayner , Henry Nebrensky, 16th November
• Upstream magnets:- Dipole B1
Quadrupoles Q1-Q3
• Downstream magnets:- Dipole B2
Quadrupoles Q4-Q9
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Exptl v Theoretical Field v position (Theoretical is Tapered 0.556T model Scaled to 0.534T)
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0.1
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0 20 40 60 80 100 120 140
Position relative to centre (cm)
Fie
ld (
tesl
a)
Experimental
Theoretical
Upstream dipole – B1 – completed tests
• Upstream dipole critical to extract
beam from synchrotron vault.
• Performed functional tests prior to
installation in July.
• Performed electrical/water tests (AN talk)
Field map & L_effectiveas expected
Central field versus current to250Amps.
Measurements agreed perfectly with tables & theory (Leff) to 250A. Not tested to full field.
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Upstream dipole – B1 – future tests
• Polarity in situ• Full B.v.I tests (into saturation)
• Determine rqd reproducibility (B/I)• Measure hysteresis • & complete standardisation if rqd.
• Scheduled for w/c 14th Jan’08
• Note, some discussion about changing pole tip of this magnet for non-tapered pole (homogeneities) – use same tests
• May monitor the field of this measurement directly during running if hysteresis significant.
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Upstream quadrupole – Q1 – completed tests
• Performed functional tests prior to
installation in July.
• Performed electrical/water tests (AN talk)
• Measured g.v.I, hysteresis• Measured (g, magnetic centre,
skew)
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Upstream quadrupole – Q1 – completed tests
• Jig allows measurement of field relative to mechanical centre & known rotation – survey references.
• Sample field along 3 lines -> extract 4 parameters, then solve for (g,magnetic centre(x,y), skew). Errors in magnetic centre ~ ±0.1mm
• no significant magnetic centre displacement
• no significant skew.
• g.v. I as expected.
• hysteresis measured at ~0.5%
•- magnet works ok.
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Upstream quadrupoles – Q1-Q3 –future tests
• Polarity in situ
• Scheduled for w/c 14th Jan’08
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Downstream dipole – B2 – future tests
• Polarity in situ• Full B.v.I tests (into saturation)
• Determine rqd reproducibility (B/I)• Measure hysteresis • & complete standardisation if rqd.
• Scheduled for w/c 9th Jan’08 or early December if services available.
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Downstream quadrupoles – Q4-Q9 – present tests
• Perform basic tests.…to qualify as early as possible if any problems exist.…
• Pole tip fields to determine ~g.v.I
• Field balance on each pole tip / colloid.
• If indications, potential to perform detailed checks with jig.
• Expected to begin this week, turnaround time <1week per magnet.
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Downstream quadrupoles – Q4-Q9 – present tests
• We have only incomplete field specifications for the Q35s!
• Detailed tests on at least two Q35s complete with mirror plates.
• Measure one magnet with each of the two coil types for reference data.
• L_effective.• Adaptor & jig -> detailed (g,magnetic
centre(x,y), skew) as before.• g.v.I
• Determine required reproducibility.• Hysteresis.• Standardisation if required.
• In ~2-3weeks
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Summary.
• Upstream magnets:-
Dipole:- performs well to 250A. Checks of full current, polarity, hysteresis in situ. w/c Jan 14th
Quadrupoles: one magnet tested – performs well. Polarity of all in situ. w/c Jan14th.
• Downstream magnets:-
Dipole:- to be tested early December or w/c Jan 9th.Quadrupoles: basic testing schedule commencing
this week. Detailed measurements on at least two of differing coil types for reference data.