FEATHER: Feedback AT High Energy Requirements Tauchi - - PowerPoint PPT Presentation

1

Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

FEATHER: Feedback AT High Energy Requirements

Tauchi Toshiaki,Hayano Hitoshi, Nicolas Delerue,Fujimoto Hiroyuki 7 electrical circuit 9 LPF 10,11 BPM signal 12 schedule <Contents of this presentation> 1 contents 2 purpose 3,4,5 estimation 6 kicker & BPM

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

Purpose of the FEATHER

e-

Inter action point

e+ BPM kicker

Hybrid & other component @1 @2 @4 @3

The purpose of the FEATHER is getting the high luminosity at the very high energy liner collider to use the feedback loop. We use the signal of the BPM(@1) and convert that signal (@2), put that signal into the kicker (@3). So, at first, beam go through , after using the FEATHER system, beam go through . We can get the lower vertical offset(@4).

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

• We uses the button BPM and the stripline kicker .
• The kicker & the BPM have the movable electrodes. We can

adjust both gaps. Because we want to raise the accuracy by “movable”.)

• We put the stepping motor in the kicker & the BPM, so we

can do good calibration for BPM.

Lay out of the extraction line (ATF at KEK)

beam Feedback BPM kicker

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

Easy timing estimation

• There is ~1.5 meter between our kicker and our BPM

So, Beam flight 5ns Cable delay 7.5ns

• The response time of our amplifier has been measured

5.6ns

• Various electronics delay should be less than ?ns

(Total ~(18.1+?)ns) ATF (at KEK):

• 20 bunches at ~2.8ns make a ~56ns train.

So, Should be possible to test !

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

Calculation of the effect of the kick

kick effect of the E= q×V×distance mc

2×gamma×gap

kick effect of the B= q×V×distance×length×u×b 2×pi×mc×gamma×R

∫

a

 da ab

1.5

Total kick effect =effect of theEB×0.67

Voltage time We want to use the 357MHz pulse, if possible. The signal voltage in the electrode of the kicker is not only positive, but also negative. So, when we use our electrode of the kicker,

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

The new kicker & the new BPM

kicker BPM Motor (for moving the electrodes) We want to adjust the position of the electrodes. Accuracy is 10 um for kicker &1um for BPM because of the estimation. So we introduced the stepping motor & the gauge. gauge(for finding the electrode)

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER BPM(up) Hybrid LPF(550MHz)

Electrical circuit

BPM(down) LPF(550MHz) Phase Sifter Programmable Attenuator AMP This is electrical circuit of FEATHER. We are doing the preparation about after the Hybrid. Kicker(downstream) Kicker(upstream)

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

The position accuracy of the kicker & the BPM

Goal gauge diff. upstream from downstream Kicker : 10um 2um 100um <- don't need to think BPM : 1 um 1um

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

The LPF performance

4.00E+08 5.00E+08 6.00E+08 7.00E+08 8.00E+08 0.00E+00 1.00E-01 2.00E-01 3.00E-01 4.00E-01 5.00E-01 6.00E-01 7.00E-01 8.00E-01 9.00E-01

PNA Series Network Analyzer (E8363B) Frequency (Hz) Lin M ag

400000000 500000000 600000000 700000000 800000000 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5

LPF (Frequency VS Attenation)

Frequency[Hz] V[V}

Simulation (spice) Measurement ( network analyzer) For simulation, I used the model of chevishef-type LPF and I compare with our LPF (at 550MHz). So, we can calculate the signal shapes with spice program after the circuit of this components.

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

Single-bunch BPM signal (simulation)

This is the consequence of the “SPICE” simulation. One is the raw signal, the other is the signal after the LPF. BPM signal (raw) BPM signal (after the LPF (550MHz))

10ns 10ns

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

Single-bunch BPM signal (experiment)

20ns 20ns

Maybe, in case of with LPF, the signal is like the simulation. But ,in case of raw signal, the signal is not like the simulation. Maybe, raw signal is very fast, so we can't use easily.

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

Schedule

Programmable Attenuator

• Calibration of the BPM.
• Test of the hybrid .
• Calibration of the BPM using the hybrid.
• Calibration of the BPM using the hybrid and AMP.
• Kick the signal from signal generator and see the kick effect

by the BPM.

• Kick the signal from the BPM and see the kick effect by the

BPM.

• Kick the signal from the BPM and see the kick effect by the

BPM with movable phase shifter.

• Control with the force of the kick using the programmable

attenuator.

BPM (up)

Hybrid LPF (550MHz)

BPM (down)

LPF (550MHz) Phase Sifter Kicker (downstream) Kicker (upstream) AMP

Electrical circuit

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER Presentation have been finished. Please give us many advices and a few questions (with very slow speaking)!

I like Taiwan, because the people is very kind and food is very good taste and so on. So I want to come again in my private time! 謝謝 !

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER

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Fujimoto Hiroyuki:

2004/11/11

fujimoto@hakone.phys.metro-u.ac.jp

Acfa-LC7 FEATHER