update on the kicker impedance model and measurements of material properties

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Update on the kicker impedance model and measurements of material properties C. Zannini, G. Rumolo, V.G. Vaccaro Thanks to: N. Biancacci, A. Danisi, H. Day, G. De Michele, E. Metral, B. Salvant

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Update on the kicker impedance model and measurements of material properties. C. Zannini, G. Rumolo, V.G. Vaccaro Thanks to: N. Biancacci, A . Danisi, H. Day, G . De Michele , E. Metral, B. Salvant. Penetration depth in ferrite. Overview. Kicker impedance model Wire measurements - PowerPoint PPT Presentation

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Page 1: Update on  the kicker impedance model and measurements of material properties

Update on the kicker impedance model and measurements of material properties

C. Zannini, G. Rumolo, V.G. Vaccaro

Thanks to: N. Biancacci, A. Danisi, H. Day, G. De Michele, E. Metral, B. Salvant

Page 2: Update on  the kicker impedance model and measurements of material properties

Penetration depth in ferrite

Page 3: Update on  the kicker impedance model and measurements of material properties

Overview

• Kicker impedance model

• Wire measurements

• Measurements of material properties

Page 4: Update on  the kicker impedance model and measurements of material properties

4

Simplified kicker model Courtesy T. Kroyer

Page 5: Update on  the kicker impedance model and measurements of material properties

5

Simulation models

C-magnet model

x

y

Page 6: Update on  the kicker impedance model and measurements of material properties

6

Comparing the two models

Using the C-magnet model in the transverse horizontal impedance a high peak at 40MHz appears. At low frequency the Tsutsui model is not able to estimate correctly the kicker impedance. The two models are in good agreement at high frequency (>400MHz).

Real horizontal quadrupolar impedance calculated at x=1 cm

Page 7: Update on  the kicker impedance model and measurements of material properties

7

Comparing the two modelsIm

peda

nce

[Ohm

]

Real vertical detuning impedance calculated at y=0.5cm

Real longitudinal impedance

We can see the peak also in the longitudinal and vertical impedance

Page 8: Update on  the kicker impedance model and measurements of material properties

C-magnet and Frame magnet

C-magnet model

x

y

Frame Magnet model

Page 9: Update on  the kicker impedance model and measurements of material properties

C-magnet and Frame magnet

Page 10: Update on  the kicker impedance model and measurements of material properties

Penetration depth in ferrite

Page 11: Update on  the kicker impedance model and measurements of material properties

Calculation of the impedance for the C-Magnet model

TSUNSCMagnet ZZZ

Where is the low frequency impedance in a C-Magnet kicker model calculated using the Sacherer Nassibian formalism and is the impedance calculated using the Tsutsui formalism. The Tsutsui impedance is calculated in H. Tsutsui. Transverse Coupling Impedance of a Simplified Ferrite Kicker Magnet Model. LHC Project Note 234, 2000. Instead we have to spend some word about the Sacherer Nassibian impedance.This impedance is defined as:

NSZTSUZ

gk

kx||NS

k||NS

ZLjZZblc|Z

acZ

Zbl)ax(Z

2

220

02

2

220

20

2

4

4

0

Where l is the length of the magnet, x0 the beam position, L the inductance of the magnet and Zg is the impedance seen by the kicker

Page 12: Update on  the kicker impedance model and measurements of material properties

12

Comparing with theoretical results

The simulations of the C-magnet model are in agreement with a theoretical prediction based on Sacherer-Nassibian and Tsutsui formalism

Horizontal driving impedance calculated at x=1cm: MKP

Frame Magnet modelHorizontal dipolar impedance

Page 13: Update on  the kicker impedance model and measurements of material properties

External circuits EK PSB

The green curve depends from the cable properties (propagation and attenuation constants)

Page 14: Update on  the kicker impedance model and measurements of material properties

14

MKP: horizontal transverse impedance

The segmentation seems to affect strongly the low frequency peak

Page 15: Update on  the kicker impedance model and measurements of material properties

Overview

• Kicker impedance model

• Wire measurements

• Measurements of material properties

Page 16: Update on  the kicker impedance model and measurements of material properties

16

Measurements of the coupling impedance using the coaxial wire method

The measured quantity is the transmission S21

proptruem QQQ111

For resonant structures:

cut-off frequency ≠0cut-off frequency =0

TEM Propagation losses

Measured Losses = True Losses + Propagation losses

Page 17: Update on  the kicker impedance model and measurements of material properties

17

seg

MKP: Comparing measured and simulated longitudinal impedance

Page 18: Update on  the kicker impedance model and measurements of material properties

11628

50760076

steelPEC

steelPEC

mrad

mradtrue

radPEC

msteel

QQQQ

QQQQQ

.QQ.QQ

Measurements of the coupling impedance using the coaxial wire method

radtruem QQQ111

cut-off frequency =5.74 GHz

Superfish 11463trueQ

Page 19: Update on  the kicker impedance model and measurements of material properties

Measurements of the coupling impedance using the coaxial wire method

Page 20: Update on  the kicker impedance model and measurements of material properties

Overview

• Kicker impedance model

• Wire measurements

• Measurements of material properties

Page 21: Update on  the kicker impedance model and measurements of material properties

21

Coaxial line method

We characterize the material at high frequency using the waveguide method

Electromagnetic characterization of materials

)'','(GS 21

),(G

),(

),(

Page 22: Update on  the kicker impedance model and measurements of material properties

Status of the measurements

We (me and G. De Michele) did measurements for some SiC in the ranges 10 MHz-2GHz and 8 - 40 GHz and for the ferrite 8C11 in the range 10MHz-10GHz

The elaboration of the results will take at least one month (simulation time of the measurement setups)

Page 23: Update on  the kicker impedance model and measurements of material properties

23

Ferrite Model

The ferrite has an hysteresis loop

Page 24: Update on  the kicker impedance model and measurements of material properties

The hysteresis effect in this measurements

μ

H

rB

m/A.H 80 TB r610

In this measurements for the coaxial ferrite sample we have:

11

hysteresis

truemeasured