Transcript Document 7454719

DEVELOPMENT OF INDUCTION MODULATOR
FOR HIGH POWER ACCELERATORS
K.Horioka1, M.Nakajima1, M.Nagata1, E.Hotta1, M.Shiho1
K.Tatayama2, E.Nakamura2, K.Torikai2
J.Kishiro3, M.Watanabe3,
T.Kikuchi4, T.Katayama4
Department of Energy Sciences, Tokyo Institute of Technology 1,
High Energy Accelerator Research Organization, KEK 2
Japan Atomic Energy Research Institute, JAERI3
Research Center for Nuclear Science, University of Tokyo 4
HIF Drivers (High Power Accelerators)
have following issues
R.O.Bangerter; Fusion Engineering and Design 44, p.71 (1998)
10MeV
50A
20μsec
100MeV
10GeV
250A
10kA
4μsec
100nsec
10GeV
Injector
1. Ion Source &
Injector Section
Electric
Focus
Magnetic
Focus
2. Beam Acceleration &
Minipulating Section
Final
Buncher
100kA
１0ｎsec
3. Final Bunching,
Focusing and Target
Irradiation Section
R&D on
Repetitive, Controllable & High Average Power
Induction Voltage Modulators
Controlled waveforms are essential for beam acceleration &
manipulation in high average power accelerators
Slightly Rising
Bi-directional
V
V
V
Time
Acceleration
Asymmetric
Time
Buncher
Time
KEK－Recirculator
Experimental Arrangement for FET-Driven Module
Element and Typical Output Waveforms
5kΩ
1.5μF
H.V
P h o to
D iode
O ptical
G a te
D river F iber
P h o to
D iode
H.V
5kΩ
1.5μF
O ptical
G a te
D river F iber
G a te
D river
O ptical
F iber
O ptical
G a te
D river F iber
(EG＆G ortec,
GG8010改)
D e la y
p u lse r
P h o to
D iode
P h o to
D iode
(Sony Tektronix,
AFG310)
(Timing Chart of FETs)
OFF
FET2
FET3
FET4
M.Watanabe et.al., Rev. Sci. Instr., A464, p.440 (2001)
Core Current, Module Volt age and St acked Voltage
Voltag e(5 0 V/div)
ON
FET1
Typical Core
Voltage & Current
Induced Voltage
Current(5 A/div)
V
1us/di v
Magnetization curves and core loss scaling
are clarified at minor hysteresis loops
Finemet(FT-1H)
Finemet(FT-1H)
1.4
100
1.2
80
0.8
lo ss( J/m
B( T)
3
)
1
0.6
0.4
60
1.0T/μs
40
20
0.2
0
0
-0.2
1.0T/μs
0.1T/μs
0
20
0.1T/μs
40
60
80
100
120
H(A/m)
Magnetization Curves
140
-20
-0.2
0
0.2
0.4
0.6
B(T)
0.8
Core-loss Scaling
1
1.2
Examples of module voltage, core-current, and
Hysteresis Loops (For Stacked Modulator)
M.Watanabe et.al., Rev. Sci. Instr., A464, p.440 (2001)
Core Current, Module Voltage and Stacked Voltage
Hysteresis Loops at MHz Operation for Finemet Core
Stacked voltage
(200V/div)
0.07
0.06
0.05
Core current
(10A/div)
B(T)
Induced voltage
(200V/div)
0.04
0.03
0.02
0.01
0
-0.01
-60
1us/div
-50
-40
-30
-20
-10
H(A/m)
Repetition 1MHz
Vd:Vreset = 1 : 5
0
10
20
R & D on Solid-state-SW based Induction Pulse-Modulator at TIT
SIThy-Based Power Modulator
FET-Based Power Modulator
0.1µF 0.7µH
C1
0.03µF
L2
SI Thyristor: T335R-40
(NGK Insulators Ltd. Co.)
Peak Hold Off Voltage: 4 kV
DC Hold Off Voltage: 3.2 kV
Effective On Current: 200 A
Peak On Voltage: 5.4 V
Voltage
Load voltage [kV]
R
Schematic diagram of 3 module circuits
0
L
SI Thy
E
-1
Control Circuit
E = 250 V
L = 2.6  H
Core Current, Module Voltage and Stacked Voltage
Stacked voltage
(200V/div)
-1
0
Time [  s]
1
Core current
(10A/div)
Induced voltage
(200V/div)
SI Thy
1us/div
Storage
Inductor
Ed
Dummy
Load
MOSFET
MOS
FET
Operation Performance of Induction Pulse-Modulator at KEK (R&D#3)
Output：+- 2.6kV (100Ohm),
Rep-rate：1MHz
Set-up for Induction Accelerating Module
Pulse Modulator
Trans. Cable
DC
Power Supply
Pulse Modulator (Inner Structure)
Single period
by KEK Induction Synchrotron Project
Concept of Induction Synchrotron
Principle
RF Synchrotron
RF voltage
Image of Accelerator
Acceleration gap
for confinement
Super-bunch
RF bunch
Voltage with gradient
Combined function
of
accel./confinement
Modulator Circuit
Pulse voltage
for acceleration
for confinement
Separate function
Induction Synchrotron
MHz operation -> serious heat-deposit
Exploratory Research Project (2003-2007)
Super-bunch Acceleration
Experimental Demonstration of Induction Synchrotron
Project leader: Ken Takayama(KEK)
Feed-back system Impedance management
2000-2003
Induction Acceleration System
R&D, manufacturing
Power Modulator Cavity
Laser-asist
H- injection
Super-bunch
Acceleration
in
KEK 12GeV PS
2003 - 2005
Switching element R&D
MOSFET
SI-Thy in low temp.
SiC-MOSFET
Applications
• Proton Driver
• Modification
of existing RF
Synchrotrons
• Super-bunch
Hadron Collider
2006 - 2010
Budget: US 5M$
In collaboration with TIT, JAERI
and Japanese industries
Operation Performance of Pulse-Modulator at KEK (R&D)
Set-up for Induction Accelerating Module
Output：2.6kV、Rep-rate：1MHz
Pulse Modulator
Trans. Cable
DC
Power Supply
Vacuum duct
Pulse Modulator (Inner Structure)
0
1
2
3
4
5
Time[sec]
Single period
by KEK Induction Synchrotron Project
Using induction modulator, beam acceleration and
manipulation will be demonstrated at KEK 12GeV PS
Main Ring
circumference:339m
500MeV Booster
40MeV H- - Linac
750kV Pre-injector
Experimental Hall
by KEK Induction Synchrotron Project
Arrangement of Devices/Cables
Pulse modulator
12GeV
Main Ring
DC Power Supply
Booster
CW 1MHz
2kV/unit, 250nsec FT
operation
Induction Accelerating Cavity
Impedance Management is Critical
for Waveform Control
V (t ) 
Miss-matching
V0
(1  cos t )
2
2
  0 
LC
Resonant Condition
HV
(Z0)
Power Transmission
Line (Z0)
L  p
Induction
Modulator
(L,C)
Concept for Waveform Control
Parallel Stacking
Typical Waveform of Module
（４ｋV-500nsec）
（４ｋV-１００nsec-ｋHz）
Module Structure
Operational Range ：100kV－kHz(FET-Driver)
Waveform Stacking
（Can make Step, Rising, Sinusoidal Waveforms）
Robust against Load Condition
Series Stacking
V (t ) 
V0
(1  cos t )
2
（20kV-100nsec）
2
  0 
LC
Voltage
Driver
Induction Cell based on Sinusoidal Modulator
•Module Structure based on
Sinusoidal Unit
* Operational Range ：100kV－
kHz(FET-Driver)
* Waveform Stacking
（Can make Step, Rising, bipolar）
*Robust against Load Condition
Test Stand for Basic Induction Unit
Voltage
Driver
Induction Modulator Unit
R&D of Induction Modulator at Intermediate Parameter
Region (10’s kV-kHz level ) is also progressing
Voltage [kV] ／Module
Operational Regime
100
H.V.
outout
Charged Particle
10
Pulse
Power
Technol
ogy
This
Project
KEK
Projec
PAV
t =100kW
1
10
Injector
1k
1M
Operational Frequency （ Hz ）
Particle
Beam
50cm
Ceramic gap
Finemet
~1m
Voltage Modulator
driven by SI-Thy
Basic Concept of Induction Cavities（（3.2kV×8）×4 ~ 100kV）
Summary
We have;
•
•
•
•
Developed a Controllable Induction Cell based on Modular Structure
Clarified the magnetic characteristics at minor hysteresis loops
Operated the Module Elements at +-2.5kV-1MHz
Installed a Test Module in the 12GeV Proton Synchrotron at KEK
We are planning
• to make demonstration of beam manipulation at KEK
• to continue component development (kHz-100kV Induction Unit)
• to make programmed switching, feedback control of the device
Concluding Remarks
Although there is a long missing link between the high flux ion injector and the
final transport region in HIF driver design , we believe that we will be able to
find out a solution based on the efforts for these issues.
• We think that these efforts allow us to extend the design space of accelerator
system and significant R&D efforts are on going in Japan, at government
laboratory (KEK) and also at Universities (TIT, Utsunomiya, Tokyo and Osaka)
Ion
Injector
Acceleration, Compression & Stable
Transport
Low
Energy
Region
Merging
Recirculator
Beam
Bending
Final
Transport
Final
Buncher
Bunching ~10
HIF driver based on High-Rep-rate, bi-polar inductive acceleration
•
Basic concept
– Positive and (Negative) Ions are accelerated by High-Rep rate (kHz) inductive
Bi-polar waveforms
– Longitudinal stacking of them in re-circulator rings with MHz Induction Modulators
•
Advantages
– Can extremely reduce the core volume and the ion source requirement
– Can avoids a risk of transverse beam merging
Re-circulator
for making a
super-bunch
High Reprate Ion
Injector
High Rep-rate (kHz)
Induction Modulators
Conceptual Diagram of HIF Driver based on
High Rep-rate Induction Technology
(By T.Kikuchi, Okamura, K.Horioka)
MHz
Induction
Modulators
Final
Buncher
Re-circulator
for making a
super-bunch
Merging
Thank you for your attention.