Proceedings of the 25th Linear Accelerator Meeting in Japan (July 12-14, 2000, Himeji, Japan)[12P-22]

FEEDBACK CONTROL FOR 324MHZ KLYSTRONSeiya Yamaguchi*), Shozo Anami, Takuji Aizawaa), and Tamaki WatanabeHigh Energy Accelerator Research Organization (KEK)
1-1 Oho, Tsukuba, Ibaraki, 305-0801 JAPANa) Nihon Koshuha Co., Ltd.
1119, Nakayama, Midori-ku, Yokohama, Kanagawa, 226-0011 JAPANAbstract
A feedback control system was constructed and tested to correct errors in the amplitude and phase of the rf field of 324
MHz high-power pulsed klystron. It was demonstrated that the field stability was maintained within ±1% amplitude and±1° phase.

324MHz"VW[\vwxy23]^mnJ%*) S. Yamaguchi, 0298-64-5693,
Seiya.Yamaguchi@kek.jp

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pulse width amplitude
rep. rate
PG UDPulser

interlock (reflection, arc,cooling water)
driver

G=18dB

A

PMAM

SW

M

6dB

I

trigger-10dBm

Q

PID
+-

16dB

3dB

324MHz
CW
0dBm

AP
P

G=15dB

6dB

D3I

A

Q

D4I

G=9.5dB

WR2300
-60dB

+-

D1 D2

G=14dB

klystron

F F

P,I,DSG

A

50W
-40dB

13dB

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Q

VXI
Waveform Analyzer

trigger

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M:IQ Modulator, D:IQ Demodulator, SW:Rf Switch,
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1.1

6

SYNERGY-1

SYNERGY-1

200

Q

RF=3dBm, σ=0.85°
RF=13dBm, σ=0.65°

03phase error [deg]relative amplitude

1.05

10.95-100-200

RF = 3dBm

210-1-2-3-4

RF=3dBm, σ=5.3%
RF=13dBm, σ=3.1%-50.90

RF = 13dBm
-300
-300

SYNERGY-1

54100

50100150200250300-6350

050100150

φ [deg]-200-100

0100

200

Q

324MHz
600µs
50Hz

2300

I

Demodulator(SynergyQMK-34-15)

200

250

300

350

φ [deg]

300

I

î✦

✶Ñ✸ ³ò´õöµ ✹✳ ß✜VW[\ú[\34ß✢`
2.5

1.4300SYNERGY-2

1.3

SYNERGY-2

SYNERGY-221.220001

relative phase [deg]relative amplitude

100Q

1.5

1.1
0.90.80.70.60.50.4-100

0.3

10.5
0-0.5-1-1.5

0.2-20.1-200

0-2.5
13-300-300

121110987

RF power [dBm]-200-1000100200

6543131211109300

Iî✧

87RF power [dBm]✶Ñ✸ ³ò´õöµ ✹✳ ß✜VW[\úVW34ß✢`6543

Amplitude

Phase

Feedback OFF

Feedback ON

2Feedback OFF

0.5

10.5

0

Phase [deg]1.5

00f4-p35

25

Phase [deg]Amplitude [a.u.]

Amplitude [a.u.]

140e4-pf4-a

1.5

Feedback ON

30

2e4-a20153025201015500100 200 300 400 500 600 700 800 900 1000

0100 200 300 400 500 600 700 800 900 1000

Time [µs]Time [µs]100 200 300 400 500 600 700 800 900 1010100 200 300 400 500 600 700 800 900 1000

Time [µs]Time [µs]î5,cd`Amplitude

Phase

Feedback OFF

Feedback ON

Feedback OFF

22

Feedback ON

100185
f3

e3-p

f3

e3

180

1%

1
1.7
1.65

0.5

00300 400 500 600 700

1%

1.7

11.65
1.6

0.5

9085
800155Time [µs]PhaseFeedback OFF

170

0510152025166

301%

167

51015202530î✪

12 Tr'_ ✯ "æO'✬✧✣<✵ .'`kè=>ß'_?@ÐNâ'(¢ëp.è¨AB'_@$'ç?(â'`2g3g3

desired value

1.5

Amplitude [a.u.]

Amplitude [a.u.]

desired value

10.5

1.5

90%

rise time(Tr) = 0 . 5 3µs
0.5(b)
10%

140

150

160

170

0510152025

30

1°

171.5

171

170.5
05

1015202530

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Dª«ePQVW[\>RO'vwxy23]^½¾
D¨E7>XF'67W
D✶Ñ✸ ³ydGßD✶Ñ✸ ³ydHIJKL"°.Ð%&ÍMâ'`1(a)013089172cd=ö;x»v`® (ÜØ,✜ ❍✢¨67W✜ ✯✢89":
'

289.5

Time [min]Time [min]

fB =

90

88.5

0

Time [min]1°

Phase [deg]

169

168

f1

e1-p

Phase [deg]Amplitude [a.u.]

Amplitude [a.u.]

170

Feedback ON
172.5

90.5
f1

e1-a

171

100 200 300 400 500 600 700 800 900 1000

cd`Feedback ON

172

0Time [µs]Amplitude
Feedback OFF1%

165

100 200 300 400 500 600 700 800 900 1000

Time [µs]î6173

170160700100 200 300 400 500 600 700 800 900 1000

Time [µs]

174

175

300 400 500 600 700

750100 200 300 400 500 600 700 800 900 1000

1.75

Phase [deg]

1.8
1.75

1.5

Phase [deg]Amplitude [a.u.]

Amplitude [a.u.]

95
1.5

180

Time [µs ]î ✫ VWcd®

0130

131

132

133

134

135136

137

138

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