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News about QDO short Prototype magnetic measurements (Dec 2011/Jan 2012)

C.Petrone, J.Garcia Perez, A. Vorozhtsov, M. Modena

“CLIC MDI Meeting” on 27/01/2012

2“CLIC MDI Meeting” on 27/01/2012, M. Modena

The “Single Stretched Wire” and “Rotated Vibrating Wire” MM System

3“CLIC MDI Meeting” on 27/01/2012, M. Modena

The “Rotated Vibrating Wire” MM System: some basic concepts taken from a recent presentation at IMMW17 (“17th International Magnetic Measurement Workshop”)

4“CLIC MDI Meeting” on 27/01/2012, M. Modena

The “Rotated Vibrating Wire” MM System

5“CLIC MDI Meeting” on 27/01/2012, M. Modena

The “Rotated Vibrating Wire” MM System

6“CLIC MDI Meeting” on 27/01/2012, M. Modena

The “Rotated Vibrating Wire” MM System

7“CLIC MDI Meeting” on 27/01/2012, M. Modena

The “Rotated Vibrating Wire” MM System

8“CLIC MDI Meeting” on 27/01/2012, M. Modena

The “Rotated Vibrating Wire” MM System

9“CLIC MDI Meeting” on 27/01/2012, M. Modena

…about our QD0 measurements:

10“CLIC MDI Meeting” on 27/01/2012, M. Modena

CLIC QD0 magnet prototype (with permanent magnet blocks in Nd2Fe14B): 1st measurement with SSW and RVW systems versus calculations

QD0 proto, PM: Nd2Fe14B, Lyoke=100 [mm]Calculated Measured

Error: ∆∫Gdl/∫Gdl(calc) [%]NI [kA] ∫Gdl [T] Grad [T/m] Leff [mm] ∫Gdl [T] Grad= ∫Gdl(MSRD)/Leff(calc) [T]

0 17.84 171.33 104.111 14.971 143.798 16.0821.004 20.82 199.49 104.377 18.283 175.163 12.1852.008 33.28 320.34 103.896 32.773 315.441 1.5232.462 40.17 387.9 103.561 39.095 377.506 2.6765.022 55.76 546.83 101.976 52.494 514.770 5.8576.026 56.29 552.27 101.931 52.956 519.526 5.923

0 1 2 3 4 5 6 70

50

100

150

200

250

300

350

400

450

500

550

600

Prototype 100 mm, Nd2Fe14B, CALCULATEDPrototype 100 mm, Nd2Fe14B, MEASUREDQD0, Liron >300 mm, Nd2Fe14B

AMPERE-TURNS PER POLE [kA]

FIE

LD

GR

AD

IEN

T [T

/m]

Fig1- Table1: Magnet excitation curve vs. computed values.

Fig2: Magnet cycle (ramp-up to Imax and ramp-down).

11“CLIC MDI Meeting” on 27/01/2012, M. Modena

CLIC QD0 magnet prototype (with permanent magnet blocks in Nd2Fe14B): 1st measurement with SSW and RVW systems versus calculations

Fig1- Table1: Measured (SCALED at R=1 mm) integrated field components (from measurement done at R=3 mm).

NI [A] Current [A] b3 b4 b5 b6 b7 b8 b9 b10 a3 a4 a5 a6 a7 a80.0 0.0 8.86 6.21 -0.50 5.12 0.03 0.03 0.00 -0.02 9.19 0.42 -1.36 -0.25 0.02 -0.01

1004.4 3.1 6.61 5.16 -0.44 3.80 0.02 0.02 0.00 -0.02 0.97 0.53 -0.91 -0.11 0.03 0.002008.8 6.2 2.38 3.66 -0.29 0.93 0.01 0.01 0.00 -0.02 0.02 0.02 -0.56 0.09 0.00 0.002462.4 7.6 2.24 3.66 -0.22 0.02 0.02 0.01 0.00 -0.02 -0.90 0.26 -0.54 0.12 0.01 0.005022.0 15.5 0.71 3.36 -0.31 -0.72 0.02 0.00 0.00 -0.01 4.00 -0.40 -0.41 0.16 -0.01 0.006026.4 18.6 1.00 3.48 -0.27 -0.70 0.02 0.00 0.00 -0.01 3.20 -0.35 -0.48 0.16 0.00 0.005022.0 15.5 0.99 3.46 -0.29 -0.71 0.02 0.00 0.00 -0.01 4.15 -0.30 -0.44 0.15 0.00 0.002268.0 7.0 3.34 3.54 -0.26 0.34 0.02 0.01 0.00 -0.02 0.49 0.32 -0.56 0.10 0.00 -0.012008.8 6.2 3.18 3.57 -0.21 0.86 0.02 0.01 0.00 -0.02 -0.25 0.24 -0.44 0.08 0.01 0.001004.4 3.1 7.06 5.11 -0.45 3.73 0.04 0.02 0.00 -0.02 1.96 0.27 -0.94 -0.18 0.02 -0.01

0.0 0.0 8.35 6.33 -0.57 5.10 0.03 0.03 0.00 -0.02 9.13 0.37 -1.13 -0.24 0.02 -0.01

Magnetic axis stability: Between the measurement at different current (ramps) it was not necessary to re-align the magnetic axis; this means that the drifting of the magnetic axis vs. current is inside a range of ~5 μm .

12“CLIC MDI Meeting” on 27/01/2012, M. Modena

thanks!

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(NOTE: These results are PRELIMINARY!)

- A second MM run is ongoing n tese days. Magntic Filed components are also under evaluation with Vibrating SSW- They promise me (as a “Christmas Gift”) a more official and complete measurements report for next week.- Magnet will be then also measured with Rotating Coil system.

First analysis:- Confirmed validity of the design.- Some missing performance to be understood (we have some ideas about this).

… what I presented at last MDI Meeting (on 1st measurement of 28 Nov. 2011):

“CLIC MDI Meeting” on 16/12/2011, M. Modena