Low-Level RF for BEPC-2
description
Transcript of Low-Level RF for BEPC-2
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