Low-Level RFfor BEPC-2

Sun YI Huang Hong Lin Hai-ying

IMAC’06Apr. 27, 2006

IHEP

e+

e+ e-

e-One machine / two purposes:

1 SCC / ring physic run2 SCC / outside ring dedicate the SR users

Harmonic number 398 ( Phy.) / 402 ( SR)

by pass chamber (SR run)

West SC East SC

RF hall (E)RF hall (W)

Refrigerator/ valve box500W / 2SC Test room for SC

Down side

SR run

IP-2#hall

Frf 499.8 MHzIb 900mA/ring 300mAPb 123kw ~80kwSCC 1/ring 2Kly. 250KW/ring 2*250KWHOMs ~5kw/scQL 1.7E5 1.7E5Q0 ( 2.0MV ) 5E8 5E8 (1.5MV) 1E9 1E9

2 LLRF stations are located respectively at the East/west RF hall beside each Klystron & PS, the test room is underground, the cryogenic hall is

above the test SCC

One LLRF / two purposes : test & beam Operation （ west)

The High power RF aging and the cold down of the #2—SCC will be taken at the test room on the next week

LLRF for the SRF west station50KW reached during the commissioning with Kly.

Cabling about 30% of the LLRF station (west)

LLRF is still under construction (west station)

Interlock and tuner of 2#-SC passed the checking at the test room, RF aging can be start at RT

The SRF state display by a touch panel

green=ok red=alarm white=no powerthe key parameters can be shown by a touch selection

超导高频系统状态显示面板

紧急停机

本地 远控

控制选择

对撞 同步

运行模式

速调管

主振信号源fRF = 499.8MHz

VSWR

M

Vc set

LLRF ON

DRFB

入射功率

反射功率

门钮

P+ P-

真空e+束流

RESET

系统恢复

负载

环行器

功率

高压电源

High Power Interlock

e-束流

氦气压力

低温槽

液氦液面

LHe Flow

陶瓷窗

PLL-kly AGC

下限位

调谐器

上限位压电陶瓷

F loop ONTuned

ALC-kly

ALC-Vc

PLL-Vc

GV

失超保护

Heater

GV

Block diagram of the RT agingto avoid the outgas from the coupler to be absorbed and conde

nsed by the Nb Surface at 4K

Hardware interlock for the #2--SCC

• The RF interlock modules of the BEPC are reused for the Vacuum, LHe level, GHe pressure Arc, quench protection of a SCC, which switch off RF within 100us

( blue , 5CH/module)• Another kind interlo

ck signals for the cooling water /wind and temp. are send to the Klystron ICS, which can be programmed by EPICS on the Web

The Q0 measurement and RF aging for SCC at 4KVc of SC can be modulated with a sharp pulse by LLRF

Interface between the Cryogenic and SRF system

det1.2

+15dB

ALC for Vc

+24dB

1-Attenuator

1-113

1-P/S180°

Station phase

u-1 FB

PLL for Vc2-P/S

±360°

1-213+15dB

bl ue

BEPC-2 SCC LLRF KLY-FB loops Sun YI 2004-Feb 11

Manual RF l ine stretcher

1CH.1 1CH.2

3-P/S 360°(PLL-Kly)

+24dB

2-Attenuator(AGC-Kly)

+24dB

+13dBm max

+13dBm max RF switch-1

RF system Interlocks to mainl ine RF switch

M

Det2.1

M

＋15dB

det1.1

1

1

3

2

3 4

4

5

5

6

Divider-3

φ cavStation φ

+2dBm 1.6mW MAX

45KV

+40dB250KW

+42dB25W

AMP-2

Klystron

Pre-AMP

-50dB

+10dBm MAXto Klystron

＋24dB

RF AMP-1

AMP-2AMP-3

AMP-3

AMP-4

-8dBm

from RF reference l ine

frf=499.8 MHz +10dBm

6-P/S360°

5-P/S360°

U/D-4

U/D-12

Col l i sion swi tch

from CCR

12

To PLL for Vc From PLL for Vc

To 0-mode FB

From 0-mode FB

Di rect RF Feedback

From ALC forVc

From F-LOOPFrom F-LOOP

BPF-1

To F-1

det1.4

FBC-2

FBRef.

φ Kly out

FBC-5

U/D-3

U/D-9

B

Ref. FB

2FCf-1

2-Phase Det.

RF Discr.2-1Powermeter

det3.2

2

4

1

3

2

I

I

2-205

2-1051-303

4CH.2

B

A

A

A

B

To ALC for Vc

速调管相位反馈环路 PLL

速调管自动增益控制环路 AGC

速调管输出信号

高频主信号通路

+20dBm100mW

+30dBm 1W

+24dB

+20dBm 100mW

-8dB插入损耗

BPF-6

To ALC for Vc,PLL for Vc ,F-LOOp,DRFB

约25米高频相稳电缆

约20米高频相稳电缆

约20米高频相稳电缆

ALC & PLL loops for the Klystron are need to compress the noise of the 50KV pulse-modulating PS

Tuning loop for a SCC in a LLRF station

det1.2

+15dB

ALC for Vc

+24dB

1-Attenuator

1-113

1-P/S180°

Station phase

u-1 FB

PLL for Vc2-P/S

±360°

1-213+15dB

bl ue

BEPC-2 SCC LLRF SUN YI 2004-Feb 11

Manual RF l ine stretcher

1CH.1 1CH.2

3-P/S 360°(PLL-Kly)

+24dB

2-Attenuator(AGC-Kly)

+24dB

+13dBm max

+13dBm maxRF swi tch-

1

RF system Interlocks to mainl ine RF swi tch

M

Det2.1

M

＋15dB

det1.1

1

1

3

2

3 4

4

5

5

6

Divider-3

φ cavStation φ

+2dBm 1.6mW MAX

45KV

+40dB250KW

+42dB25W

AMP-2

Klystron

Pre-AMP

+10dBm MAXto Klystron

＋24dB

RF AMP-1

AMP-2AMP-3

AMP-3

AMP-4

-8dBm

from RF reference l ine

frf=499.8 MHz +10dBm

6-P/S360°

5-P/S360°

U/D-4

U/D-12

Col l i sion switch

from CCR

12

To PLL for Vc From PLL for Vc

To 0-mode FB

From 0-mode FB

To Di rect RF Feedback

From Direct RF Feedback

From PLL for kly

To PLL for kly

From AGC for kly

To AGC for kly

To Detune Control and cryogenic

BPF-6

9

To F-1

From ALC for Vc

To ALC and PLL for VC and DRFB

Tuner driver

Piezo driverPiezo control ler

Tuner control ler

U/D-2Force load

U/D-8

BPF-6

4-101

4FCf-1

det4.1

Moni .

φ tuner

3CH.1

9

10

RF Discr.3-2

BA

A

B

Tuning swi tch

4-Phase Det.

123

4-103 4

3

4-107

From Detune Control

LLRF F-loop

Qext difference between KEKB and B-2

BW is half of KEKB’s

KEKB BEPCII

frf 508.885MHz 499.8MHz

Q0 7×108 7×108

QL 7×104 1.7×105

P+ ~250KW ~150KW

β0 1×104 6×103

BW 7.3 KHZ 2.9 KHZ

△f 250K/1bar 250K/1bar

△φ 63Hz/1° 26Hz/1°

△φ 4°/ mbar 29°/ 3mbar

Beam loading△f= -( Ib*Sinφs /2Vrf )* R/Q *frf

• For KEK-B:• frf=508.885MHz , Vrf=1.2MV , U0=3.5MV , ∑Vrf=13MV • Ib=1.1A ， P+ =250KW φs=78.5• △f≈-21 KH z

• For BEPC-2:• frf=499.8MHz , Vrf=1.5MV , U0=0.121MV , Ib=0.9A ，

P+=123KW φs=85.4 • △f≈-14 KH z

• The SCC cavity lengthing ~35um under a beam loading of 900mA / ring

Bandwidth difference between the KEKB and B-2

Tuner and Piezo for a SCC

LLRF can Tune the freq. of 2#SC now, the step motor and HV piezo has been test.

Directional RF feedback loop (DRFB) reduce the impedence to be seen by the beam , μ=0 mode Robinson

det1.2

+15dB

ALC for Vc

+24dB

1-Attenuator

1-113

1-P/S180°

Stati onphase

u-1 FB

PLL for Vc2-P/S

± 360°

1-213+15dB

bl ue

BEPC-2 SCC LLRF 2004-Feb 11

Manual RF l i nestretcher

1CH.1 1CH.2

3-P/S 360°(PLL-Kl y)

+24dB

2-Attenuator(AGC-Kl y)

+24dB

+13dBmmax

+13dBmmaxRF swi tch-

1

RF systemInterl ocksto mai nl i ne RF

swi tch

M

Det2.1

M

＋15dB

det1.1

1

1

3

2

3 4

4

5

5

6

Divi der-3

φ cavStati on φ

+2dBm1.6mWMAX

45KV

+40dB250KW

+42dB25W

AMP-2

Klystron

Pre-AMP

+10dBmMAXto Kl ystron

＋24dB

RF AMP-1

AMP-2AMP-3

AMP-3

AMP-4

-8dBm

fromRF reference l i ne

frf=499.8 MHz +10dBm

6-P/S360°

5-P/S360°

U/D-4

U/D-12

Col l i si onswi tch

fromCCR

12

To 0-mode FB

From0-mode FBFromPLL for

kl y

To PLL for kl y

FromAGC forkl y

To AGC for kl y

To F-LOOP,Detuneand cryogeni c FromF-LOOP FromF-LOOP

BPF-6

9

To F-1

det4.2φ Cav

4-2034CH.1 10

FromALC for Vc

1-401

4－2

5－1

5－3

det2.3

1

1234

To PLL for Vc

FromPLL for Vc

To PLL for Vc

+26dBmmax

+13dBmmax

4-P/S180°

2CH.1

U/D-10

1-406

1-405＋24dB

RFMONIIN

1-313

det2.4RF Swi tch-2

＋15dB

l ocalφ DRFB

FromSEQ

Modul ator-3

AMP-5

7

AMP(24)-9

7

U/D-1

2CH.2

1-403

det1.3RF

MONIOUT

2

3-PhaseDet.

B

AB

A

3FCf-1

μ=0 mode damping loop: hardware is under the designμ=-1 mode damping loop can be added inside LLRF in a day

det1.2

+15dB

ALC for Vc

+24dB

1-Attenuator

1-113

1-P/S180°

Station phase

u-1 FB

PLL for Vc2-P/S

±360°

1-213+15dB

bl ue

BEPC-2 SCC LLRF 2004-Feb 11

Manual RF l ine stretcher

1CH.1 1CH.2

3-P/S 360°(PLL-Kly)

+24dB

2-Attenuator(AGC-Kly)

+24dB

+13dBm max

+13dBm maxRF swi tch-

1

RF system Interlocks to mainl ine RF swi tch

M

Det2.1

M

＋15dB

det1.1

1

1

3

2

3 4

4

5

5

6

Divider-3

φ cavStation φ

+2dBm 1.6mW MAX

45KV

+40dB250KW

+42dB25W

AMP-2

Klystron

Pre-AMP

+10dBm MAXto Klystron

＋24dB

RF AMP-1

AMP-2AMP-3

AMP-3

AMP-4

-8dBm

from RF reference l ine

frf=499.8 MHz +10dBm

6-P/S360°

5-P/S360°

U/D-4

U/D-12

Col l i sion swi tch

from CCR

12

To PLL for Vc From PLL for Vc

To Di rect RF Feedback

From Di rect RF Feedback

From PLL for kly

To PLL for kly

From AGC for kly

To AGC for kly

From F-LOOP From F-LOOP

To F-1

BPF-6

To ALC for Vc,PLL for Vc ,F-LOOp,DRFB

From ALC for Vc

from 束流测量来

e-

Current moni tor

BPF-high Q

e-e＋

4-105

φ beam

3CH.2

AMP-6

+24dB

AMP-6

+15dB11

To Detune Control

LPF

Hybrid90°

Osci l loscope

0-mode FB

local

FBC-6

U/D-11

B

AB

A

6FCf-1

5-Phase Det.

~100米高频相稳电缆

There is a long way for LLRF to welcome the beam

• INTL with the two ring vacuum for each SC• Interface with CCR ( remote control )• beam signals / timing / RF phase drift between 2rings (IP shift)• RF phase 2bucket phase shift for the collision SW, Damping ti

me ~20ms, switching speed control or not? • Beam trip diagnostic / fast Data acquisition for the detecting of the real reason of a trip,

who first? e+ or e- , SRF or others result in the trip? which part troubled inside SRF?• Q0 online measurement ( every 2~3 month)• DRFB loop test / 0-mode damping loop• Two SC run protection mode • HOMs power and bunches/current margin PHOM=KlossqIb = Kloss (Ib

2 / Nbf0) q=Ib/Nb*f0 

potential problems

RF SCRF SC

e+e-

RF SCRF SC

e+e-

RF SCRF SC

e+e-

e-腔相位φ =0°e+腔相位φ =0°

第二对撞点

正常对撞时

e-腔相位滞后移动φ = - 360°

e+腔相位超前移动φ =+360°

第二对撞点

注入束流时

/正 负电子交叉通过

第二对撞点

e+腔参考相位φ =+360°

e-腔参考相位φ = - 360°

fi l l pattern4 bucket spaci ng

IP对撞点 漂移影响亮度问题

全部电缆施工由低电平系统安排解决

LLRF 东厅e-

LLRF 西厅e+

BPM

BPM

e+

cabl e

e-

cabl e

e+

cabl e

e-

cabl e

e+ cabl e

e- cabl e

4个不同位置处的BPM束流信号位置

: 注释 图中虚线为测量和备用高频相稳电缆

LLRF西厅

LLRF东厅

fRF=499.8MHz,+10dBm

束测定时

束测定时

LLRF西厅 LLRF西厅

~

~

联络电缆

两厅联络相稳电缆

真空总联锁信号TTL开关量

真空总联锁信号TTL开关量

To LLRF连锁To LLRF连锁

波纹管

闸板阀

离子泵

分子泵

离子泵

陶瓷窗真空To LLRF

0-10V模拟信号隔热层真空

10-5Pa

气源、压力

低电平联锁

气源、压力

低电平联锁

离子泵

0-10V模拟信号To LLRF

四极质谱仪

真空组真空计

真空组真空计

离子泵

0-10V模拟信号To LLRF

四极质谱仪

真空组真空计

真空组真空计

MG真空计 LLRF真空计

腔真空To LLRF

0-10V模拟信号

PIRANI真空计To LLRF

0-10V模拟信号

保险阀

两环真空连锁保护系统

TTL开关量

本别送两侧高频厅低电平系统

陶瓷窗

超导腔

超导腔周边真空信号的接口

e+环 e-环

: 1) 注释 图中黄色部分为真空系统设备蓝色部分为低电平接口部分 2) ,束流运行时 两环上任何真空阀门动作将连锁低电平关闭超导腔信号 3) taper 6#超导腔两侧 下的离子泵电源安装于低电平 柜上层 4) MG 4#真空计安装于低电平 柜下层 5) ,各类真空用高压电缆和设备由真空组负责提供 由低电平组织安装

离子泵电源

离子泵电源

HOM power should be limited within 10KW/SC, to prevent the HOM dampers from a outgasing and cracking,

therefore we need establish a margin between the Ib and bunches

HOM_POWER-D10Jan 30 Vs Apr05

1187 Vs 1382 bunches

0

1

2

3

4

5

6

7

8

9

10

11

12

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3

beam (A)

HOM P

OWER

(KW)

D10A

D10B

D10C

D10D

K1.0024

HOM_POWER-D10 Apr051382 bunches 3.5 bucket-spacing

VC=13 MV

0123456789

10111213141516

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5

beam (A)

HOM P

ower (

KW)

D10A

D10B

D10C

D10D

K1.0024

K0.8738

K1.1747

8mm

6mm7mm

LLRF should be more complicated for the beam run than the test

φ tuner

4-105

d2

-8dBm

φ Cav

D2

+15dB

ALC for Vc

+24dB

Attenuator

1-113

P/S180°

Station phase D4u-1 FB

φ Kly out

Powermeter

from RF reference l ine

frf=499.8 MHz +10dBm

U/D-4

P/S360°

P/S360°

PLL for VcP/S

±360°

1-213

+15dB

A

B

A

A

B

2FCf-1

B

AB

A

3FCf-1

blue

BEPC-2 SCC LLRF 2004-Feb 11

FBC-3

FBRef.Vc setU/D-7

4FCf-1

FB

FBC-4

Ref.

Bias voltage

FBC-5

FBC-2

FB

FB

Ref.

d1

MB

RF Discr.1-4

DET.1

M

B

U/D-9

from CCR Spectrum

Analyzer

Normal Interlock

LLRFcontroller

Sequence

ArcInterlock

RF Interlock

Open/close loopU/D voltageAuto-tuning

＋24

I I I I

f-1local oscil.

f-1=498.8MHz

CAMAC/VME

(to CCR)

frf=499.8MHz

＋24

+26dBm max ＋24

I

I

Freqencycounter

＋24

f-1+26dBm

max ＋24

I

I

.

.

. e-

Current monitor

BPF

BPF

Tuner driver

Piezo driverPiezo controller

Tuner controller

U/D-2Force load

BPF

Oscilloscope

To LAN-bus

Vc P+ phase beam

BA

A

B

B A

II

Function generator

Osci l l oscopeLPF

Manual RF line stretcher

1CH.1 1CH.2

φ Cav

4-203

1

2

34-103

φ beam

Moni.

BPF-high Q

φ tuner

BPF

4-101

44-107

Powermeter

U/D-12

Collision switch

from CCR

Ref.

U/D-3

B

P/S 360°(PLL-Kly)

+24dB

Attenuator(AGC-Kly)

+24dB

+13dBm max

+13dBm max

RF switch

2-105

I I

1-303

RF system Interlocks to mainline RF switch

M

cable box

RF Discr.1-1

BPF

2CH.2

1-403

D

M

RF Disc.

RF Interlock

BPF

1QLA-9

2-107

2-209

1-401

32 41

RF Discr.2-1

1FCf-1

A

B

A

A

B

FBC-1

FB Ref.

U/D-5

+26dBm max

U/D-1

+13dBm max

P/S180°

local

2CH.1

U/D-10

D3 RF

MONIOUT

1-406

1-405 ＋24dB

DET.2 2-205

RFMONI

IN1-313

det.4

RF Switch

4－2

5－1

5－3

1

det.3

RF Discr.3-3

4-401

d34-205

det.1

M

HOM

temp

temp

vac VcP+,-

LHe

LN2

Window/doorknob

TaporQ

60channal recorder

60channal recorder

GP-IB to VME-bus

I

RF Discr.

Vc To cryogenic

CAMAC56

06

U/D-6

offset

CAMAC56

06

0-mode FB

RF Discr.3-2

e-e＋

＋15dB

+24dB

＋15dB

+15dB+24dB

FBC-6

Hybrid90°

B

A

AB

A6FCf-1

+20

Tuning switch

U/D-11

local

D1

From RF AMP-2

1

2

3

4

5 6

7

8

9

10

11

Divider-3

4CH.2

3CH.1

3CH.2

4CH.1

φ DRFB

φ cavStation φ

φ DRFB

From SEQ

+24dB

U/D-8

+2dBm 1.6mW MAX

5FCf-1

45KV

+40dB250KW

+42dB25W

Meters with Relay

16CH.Dataacquiring

To normal Interlock

PCCentr.Control Room

RF AMP-2

To 6FC-(B)

Klystron

Pre-AMP

-50dB

2

3

4

From ceramic window/cav.doorknob/circulator/kly.out

doorknob

From Breakdown Detector/Vc Discri./RF Discrimination modules

From 60 channel recordor/vacuum

meters/refrigerator/kly./SQC/meter relay/safty

FC1

FC2

FC3

FC4

FC5

FC6

12

To F-1

From Div.12

+10dBm MAX

to Klystron

-50dB

Summary1) The challenge works of SRF are coming, specially for LLRF2) The RT aging of #2-SC ( Apr.30—May 2 )3) The cold down of #2-SC ( May 10—17 )4) Q0 measurement and pulse aging ( May 18—20 ) 5) #1—SC is under the final assembly now6) The cold down and High power test of #1—SC ( June ) 7) Installation of the two SC at tunnel ( July ) 8) SRF system commissioning ( Aug.—Sep.) Cryogenic + SCC + Kly.+ LLRF=?9) Beam commissioning with SRF ( Oct. )

The Beam may prove all

• Thanks to Prof. K. Akai , T. Furuya, S. Mitsunobu for help.• Thanks to Dr. Wang Chaoen of TLS , for the useful suggestions.• Thanks to Prof. S. Kurokawa for the pushing on the co-operation.

Thanks every expert