PAL/POSTECH 제 2 회 한국 국제선형충돌가속기 워크숍 Waveguide System for Linear...

PAL/POSTECH 제 2 회 한국 국제선형충돌가속기 워크숍

Waveguide System for Linear Collider

Woon-Ha Hwang

Linac DivisionPohang Accelerator Laboratory

2005,12,28


Design Parameter of Tesla RF System

Parameter Unit Value

Mass Energy Eb [GeV] 500

No of Klystron 584(572)No. of Accelerating Structure 21024No of Cavity for One Klystron 36

Accelerating Gradient Eacc [MV/m] 23.4

Maximum Beam Current Ib [mA] 9.5

RF Frequency fRF [GHz] 1.3

Active Length [km] 21.8Klystron Peak Power [MW] 9.5(2*5)RF Average Power [kW] 150 Peak RF Power for Cavity [kW] 231Drive Power by SSA [W] 160

Repetition Rate frep [Hz} 10

RF Pulse Length TRF [us] 1370

Beam Pulse Length Tb [us] 950

Cavity Fill Time Tfill [us] 420

High Voltage Pulse Length [ms] 1.7


RF Power Waveguide Distribution

- Distribution of klystron output power to the super-conducting cavities- Protection of the klystron from reflected power- Control of phase and Qext


RF Power Components

-10MW muti-beam klystron; two RF output windows; 36, 9-cell cavities; three modules(3x17m)

-RF distribution; two symmetrical systems; each supplying 18 cavities

- Linear system branching; directional couplers ; long parallel waveguide lines can be avoided

- Circulators; to protect the klystron against reflected power

- Three-stub waveguide transformer; possibility of 500 phase adjustment ; impedance matching range between WG and input coupler; each stub is equipped with a motor


RF Waveguide Components for Operation with Air


RF Waveguide Distribution Status of TESLA

- Waveguide components for TESLA have been developed in cooperation with industry or are standard of the shelves components

- Operation experience of 10 years from TTF

- Development of integrated components has been started(e.g. circulator with integrated load)

- Development of a high power circulator (1MW)for operation with air and development of new tuners (E-H, or inductive tuner) have been started

Parameter TESLA PLS

Operating Frequency [GHz] 1.3 2.856

Waveguide Type WR650 WR284

Dimension 6.5” x 3.25” 2.84” x 1.34”

Material Copper Copper

Frequency Range [GHz] 1.12-1.70 2.60-3.95


Linac Parameters of ILC/European


Input Coupler for Super-Conducting Cavity

Rectangular to Coaxial


Measurement of Cavity Parameters for Klystrons(Measurement of Klystron Input Cavity)

Hook Coupling

NetworkAnalyzer

S11

30

29

Tuning Pot

To Anode


Measurement of Input Cavity Parameters- Measurement Results for Klystron Input Cavity(Ginzton Method)

= 2.83, Q0 = 2546, QL = 664

Smith Chart

SWR


Development of 140MW Waveguide Valve (At At 30Hz, 3 sec)

Reflected Power ; 9 MW

Incident Power ; 140 MW


RF Window

CM : Camera PM : Photo Multipllier

IP : Ion Pump (230l/sec) CCG : Cold Cathod Gage

DC : Directional coupler PS : Phase Shifter

RGA : Regidual Gas Analyzer

RESONANT RING

-10dB Power Divider

-50dB DC

PS & ReactorTuner

H-bend

DUT(Waveguide Valve)

CM PM

IPCCG

Viewing Port

Viewing Port

-50dB DC

72.14

34.04

CCG

KLYSTRON

PULSE TANK

RF W

ate

r Load

(6

0d

B D

C)

TwistH-bend

E-bendE-bend

230l/s230l/s

IPIP

TPG2-1

TPG1-1

20l/s

CCG

IP

TPG2-2

20l/s

60l/s

IP

IP

CCG

120l/s

TPG1-2

(DC/B) (DC/A)

(DC/2)-50dB DC

(DC/1)-50dB DC

CCG

RGA

High Power Test Facility(TWR)- Ring Power ; 30 Hz, 4.sec, 200 MW


Development of SiC Load

- 50 MW at 1 s and 50 Hz



Results of power handling capability

Parameters Step I Step II Step IIIPulse Width (s) 1 4 4

Repetition Rate (Hz) 50 10 50Peak Power (MW) 50 40 12Temperature Rise (oC) 6.4 > 3.1 4.5Radiation (mR/hr) < 0.1 > 20 < 0.1Vacuum (Torr ) < 2.4 x 10-8


Development of SLED for K12 Module

Input Power ; 60MW for 4usec with 10HzOutput Power ; 200MW for 1usec with 10Hz

3dB Power Divider

SLED Cavity


- PLS A/C Tuning System- Phase Tuning of Waveguide Branches- High Power performance Test- Measurement of Dielectric Constant for Ceramic,SiC- Design of rf components(Load, Power Divider,Coupler..)

RF Measurement Technique


Summary

- All main components for the TESLA RF system are available today- For all components at least two vendors are available and many components are standard catalog products- Improvements for more cost efficient and enhanced reliable components are underway

Working in Tesla

Wish for Collaboration Works in Collider

- Collaboration of Design of Waveguide Components- Fabrication of Waveguide Components- Low/High Power Test of WG Components- Waveguide Components

; RF Load, 3-Stub Tuner, Hybride Coupler, E/H Bends, Circulator

PAL/POSTECH 제 2 회 한국 국제선형충돌가속기 워크숍 Waveguide System for Linear...

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