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Areal RF Station
Yerevan 16.07.2013
A. Vardanyan, L. Hakobyan, H. Avdishyan, H. Davtyan, H. Poladyan
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
RF System
2
The AREAL RF system will consist of 3 RF stations:
Each RF station has 1 klystron, HV modulator, a low-level RF system, preamplifier and an interlock and control system.
1 station is required for RF Gun
2 (or 1 station) stations – for accelerating section(s) operation
LLRF systems which control the amplitude and the phase of the RF
RF power 7 MW in peak at 3 GHz
Interlock and control system
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
The Required Operation Parameters
• Peak power 6 MW
• Gradient 17 MV/m
• RF pulse duration 3.8 µs
• Repetition rate 1-2 Hz
3
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
RF Power Source
• Frequency 3 GHz
• RF Pulse Duration 3.8 µs
• Repetition Rate 1-2 Hz
• Cathode Voltage 190 - 200 kV
• Beam Current 95 - 105A
• HV Pulse Duration 3.8 µs
• RF Peak Power 7 MW
4
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
K211 Klystron Parameters
• Output Power peak 7 MW
• Efficiency 40 %
• Gain (min. dB) 31
• Beam voltage 200 KV
• Beam peak current 92A
5
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
KY211 Klystron Main Parameters
• Water and Air Cooling For Operate Rate (50Hz)
• Water flow to body 3.64 l/min min
• Water flow to collector 20.5 l/min min
• Resistance of cooling water 50 kOhm cm min
• Air flow to output window 85 l/min min
• Cooling Air pressure 2.1 kg/cm2 min
6
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
KY211 Klystron Main Parameters
7
5
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
7
7.1
0 1 2 3 4 5 6
30
31
32
33
34
35
36
37
38
39
0 1 2 3 4 5 6
Peak RF Input Power in kW
Pe
ak
RF
Ou
tpu
t P
ow
er
in M
WG
ain
in
dB
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Low Level Radio Frequency Control
Characteristics of Signal/Probes:
• Phase stability 0.1 deg@3GHz
• Amplitude stability 0.1%
• Amplitude dynamic range 40 dB
• Ready to be integrated into the EPICS control system
8
The LLRF system ordered by I-Tech LIBERA.
1st stage.
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
RF Control System
Requirements for the RF control system
• Phase and amplitude stability of the accelerating field during 2 µs flat-top RF pulse – Field amplitude control 0.1%– Phase control 0.1°
• A frequency and phase stable master oscillator for RF reference signals to measure the cavity fields
The RF control system will provide:
– Remote control for all RF components– An opportunity to change the necessary parameters such as
waveguide tuners, phase shifters, etc.
9
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
LLRF / Control
RF Amplifier
Master OscillatorTi
min
g
Modulator
GunInterlock
Cooling
GunCavityWaveguide System
Phase shifter,Couplers,
Loads,Circulators, etc.
RF Gate
Vacuum
Pickups & Probes
Klystron
ACC1
LaserOpticsLaser
Cathode
?
Control System Block Scheme Overview
10
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Master Oscillator
The Master oscillator designed by InWave AG according
to our requirements. • Frequency ports:
– 1x 1Hz 1x 9MHz
– 1x 2Hz 1x 81MHz
– 1x 9MHz 1x 250MHz
– 1x 81MHz2x 90MHz
– 1x 125MHz 2x 10MHz (Secondary)
– 1x 250MHz 1x 10MHz (main)
– 2x 500MHz
– 1x 1GHz
– 2x 3GHz
11
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
The Measurement Results
The picture describes RMS phase Jitter 6.47 fsec !
12
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
The Location of RF Equipment
13
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
RF Test stand
• Modulator (HV pulse power source)
• HV pulse modulator
• 1:18,2 pulse transformer in an oil tank.
• The nominal pulse duration is 3.8 µs.
• Requirements to the flat top ripple
– should not exceed ±1%.
– The pulse-to-pulse stability better than ±0.5%.
14
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Amplitude flatness ~ 1.2%
RF Station
K211 Modulator
Measurements
15
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Measurements
16
K211 Modulator
> 200 kV
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Equipment
LB480A Pulse Profiling USB PowerSensor
Specifications
50 MHz to 8 GHz (functional to 10 GHz) - 60 dBm to +20 dBm1.95% Total Error
17
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Equipment
18
Power Meter GUI
Pulse profiling GUI
Power Meter Measurements 10 MHz Pulse Profiling (standard) 100 kHz Time resolution 0.1 us10 % to 90% Rise Time ~100 ns (-70 to -20 dBm pulse measured @ 4 GHz)
10 % to 90% Fall Time ~100ns (-70 to -20 dBm pulse measured @ 4 GHz)
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Equipment
19
0
1
2
3
4
5
6
7
8
9
0 2 4 6 8 10 12
Power Amplifier output (+24dB Att.)
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Klystron V-A Characteristics
20
A [A] V [kV]
33.(3) 81.9
36 92.82
52.2(6) 131.04
66 163.8
69.(3) 174.7
77.(3) 192.9
90.(6) 209.3
0
10
20
30
40
50
60
70
80
90
100
0 50 100 150 200 250
I [A
]
U [kV]
21.11.2012
Typical
23.10.2012
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
S-parameters
21
Directional coupler 1 Directional coupler 2
S11 -17,78 dB S11 -19,316 dB
S12 -0,615 dB S12 -0,613 dB
(FW) S14 -76,8 dB (FW)S14 -76 dB
(REF) S23 -76,8 dB (REF)S23 -73,2 dB
Directional coupler 1
Directional coupler 2
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
TH2436 Modulator V-A Measurements
22
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
After adjusting modulator coils we get +/- 1%
TH2436 Modulator V-A Measurements
23
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Net Stability Measurements
24
Network±2.4V/330V0.7%
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Measurements
25
PS12V out±380mV/12V1.5%
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Solenoid and Body Thermocouple Calibration
0
200
400
600
800
1000
1200
1400
1600
1800
0 10 20 30 40 50
R[*
2kO
m]
T[°C]
Date of measurement 22.10.2012
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Klystrons Input Resonant Frequency Measurement
YK1110K211
t=28oC
27
Resonant TM010 mode
On axis
Ez [MV
/m]
z [cm]
Cavity parameters for TM 010 resonant mode
Frequency – f [GHz] 2.99646
Unloaded quality factor – Q0 15292.34
Shunt impedance – Rsh=V 2/(2 Pd) [MΩ] 2.1174765
Rsh /Q0 [Ω] 138.4665
External quality facor – Qe 15434.52
Loaded quality factor – Q=(1/Q0+1/Qe)-1 7681.55
Coupling factor – β=Q0/Qe 0.99
Natural filling time (loaded/unloaded) –
τ=2 Q/(2π f) [μs]
0.816
π – mode freq. – 2.99646 GHz
A. Tsakanian
6 MW flat-top regime
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Adjusting PFN Coil with real Load
Interlock Testing
Klystron Mounting &
Testing
PFN Tuning, Power Supply , Cathode
conditioning, Shielding,
Cabling, Preamplifier
Modulator & Preamplifier Preparation works
Move to tunnel
Mounting & Testing
Interlock Testing•.•.•.•.•.
Measurements
RF
Stat
ion
Rea
dy
19
.09
.20
12
Waveguides delivery
8/O
ct
26
/Oct
26
/No
v
HV ON
Integration wit other subsystemsCooling Vacuum
Radiation SafetyInterlock Integration
15
/Oct
LLRF Impl.
Measurement of Klystron Working Parameters for FF
table (Gain, saturation, etc…
)
Prep. Klystron start
17
/Dec
Sep Oct Nov Dec Jan
40 41 42 43 44 45 46 47 48 493938 50 51 52 1
Oil tank
ready
Ordering VNA Cables and Calibration Unit
5/N
ov
Klystron resonator measurement for
optimal Temperature
Klystron START
without LLRF
LLRF test
Ordering missing parts
Stage 1
12
/No
v8
/Oct
2 0 1 2 Presented on 19.09.2012
Klystron Start Preparation Works
29
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
Inte
rlo
ck T
esti
ng
Mo
un
tin
g &
Tes
tin
g M
easu
rem
ents
Mo
ve t
o t
un
nel
Jan Feb Mar Apr May Jun Jul Aug Sep
RF
Rea
dy
Tod
ay
18
/Ap
r
PFN
Tu
nin
g
Inte
grat
ion
wit
oth
er s
ub
sist
ems
LLR
F Im
pl.
LLR
F te
st
Pre
p. K
lyst
ron
sta
rt1
/Sep
30
Stage 1
2 0 1 3
K211 mod. coax x2 50
Ohm
Network 220 V
RACK - 1
Remote Control
Main Trigger
Klystron Heater
HeaterPower supply
TH2436 Modulator Power supply
Index Volts / Amperes
K211 mod. coax x250 Ohm TH2436
mod. coax 50 Ohm
K211 klystron
K211 klystron solenoid
TH2436 mod.
±12,24,130,250 V
K211 klystron coax x2 V-A
TH2436klystroncoax x2
V-A
Main Trigger
K211 mod. 24
pole
1 or 2 Hz
thyratrons’ driver
Wiring of Subsystems
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
AC
transformer K211
K211 modulator
K211 mod.coax x2 50 Ohm
K211 mod. 24 pole
K211 klystron coax x2 V-A
thyratron
driver
K211 mod. coax x250 Ohm
K2117 MW
TH2436 klystroncoax x2 V-A
TH2436 mod.±12,24,130,250 V
thyratron driverTH2436 mod. coax 50 Ohm
TH2436modulator
TH243610 KW
K211 klystronsolenoid
K211 klystron heater
Network 220 V
Network220 V
Wiring of Subsystems
32
Acharyan 31, 0040, Yerevan, Armenia Tel / FAX (+374-10) - 629806
• The majority of the tasks defined for our group were performed according to the schedule. The critical issue remains the problem of timing which we plan to solve via simple time delays.
• An important problem we haven’t yet paid enough attention to is the automatic synchronization of the laser and RF, which at the first phase we plan to perform manually.
• The analog interlock system is implemented and tested which will protect the accelerator and the RF station.
• An additional digital interlock system for the RF system is required. The Digital Interlock System (based on programmable logic devices) will be implemented after the LINAC first stage completion and upon necessity it can be easily modified during operation.
Conclusion
33
Thank You for Attention!!!
34
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