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Commissioning and Initial Operation of the KOMAC 100-MeV Proton Linac
Commissioning and Initial Operation of the KOMAC 100-MeV Proton Linac
KOMAC / KAERI
Kyung-Tae Seol
KOMAC / KAERI
Kyung-Tae Seol
AFAD2014, January 14-16, 2014Melbourne, Australia
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Outline
KOreaMulti-Purpose AcceleratorComplex
Facility Introduction
100MeV Linac
Operation Status
Plan
Conclusion
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KOMAC site (Gyeongju)
KTX StationTo Seoul ~2 Hour
KOMAC phase 2 Site650m(L) X 400m(W) KOMAC site
450m(L) X 400m(W)
Seoul-Busan Expressway
Access Road 1,100m(L) x 20m(W)
• Land & Electricity for Future • Easy Access from Seoul, Busan, and Pohang• Good for sightseeing To Pohang
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Main Facilities
12
34 65
Sewage Plant6Electric Substation3 Utilities4 Cooling Tower5
Proton Linac1
2 Beam Line
Site: 180,000 m2
Building: 39,843 m2
(Accelerator and beam line 14,426 m2)
Electricity : 154kV, 20MVA
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Linac and Beam Lines
50 keV Injector
3 MeV RFQ
20 MeV DTL100 MeV DTLSRF TB
RI Semiconductor
Life-Medical App.
Materials
Basic Science
RI
Medical App.
Neutron Source
Basic ScienceAerospace App.
Nuclear Materials
Output Energy (MeV) 20 100
Max. Peak Beam Current (mA) 1 ~ 20 1 ~ 20
Max. Beam Duty (%) 24 8
Avg. Beam Current (mA) 0.1 ~ 4.8 0.1 ~ 1.6
Pulse Length (ms) 0.1 ~ 2 0.1 ~ 1.33
Max. Repetition Rate (Hz) 120 60
Max. Avg. Beam Power (kW) 96 160
Features of KOMAC 100MeV linac
50 keV Injector (Ion source + LEBT)3 MeV RFQ (4-vane type)20 & 100 MeV DTLRF Frequency : 350 MHzBeam Extractions at 20 or 100 MeV 5 Beamlines for 20 MeV & 100 MeV
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RFQ ( Radio-Frequency Quadrupole )RFQ ( Radio-Frequency Quadrupole )
Vane Fabrication Alignment before Brazing Brazing Design
Field tuning(<2%) Installation & operation (Daejeon) Leak Test
RFQ was fabricated with a domestic company
Frequency 350MHz, Beam Energy 3 MeV, Peak Beam Current 20 mA
4 vane type, Length 3.2 m
4 dipole stabilizer rod, adopting resonant coupling
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DTL ( Drift Tube Linac )DTL ( Drift Tube Linac )
Design
DT Quadrupole(field : 1.75 T±1%)
Assembled DTL
DTL Tank Fabrication(< 100 m)
Tank Surface Plating(< 100 m )
DTL tank assembly(< 100 m)
DT Position < ±40 mDT Assembly and Alignment(< 50 m )
x
DTL102 DT Alignment Result
-0.050
-0.040
-0.030
-0.020
-0.010
0.000
0.010
0.020
0.030
0.040
0.050
-0.050 -0.040 -0.030 -0.020 -0.010 0.000 0.010 0.020 0.030 0.040 0.050
x Deviation [mm]
y D
ev
iati
on
[m
m]
y
DTL was also fabricated with a domestic company
DTL consists of 11 tanks ( 3~20 MeV: 4 tanks, 20~100 MeV : 7 tanks)
350MHz, peak beam current 20mA, FFDD lattice with electromagnetic quadrupole.
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100MeV Linac Installation
Microwave ion source 3-MeV RFQ 20-MeV DTL
MEBT 100-MeV DTL
20-MeV linac was operated for 5 years at Daejeon site
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Beam Line & Target Room
100-MeV Beam line TR103 target room
2 Beam lines : 1 for 20-MeV, 1 for 100-MeV
2 Target rooms : 1 for 20-MeV (TR23), 1 for 100-MeV (TR103)
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HPRF system
9 Klystrons : 1 for RFQ, 1 for 20-MeV DTL, 7 for 100-MeV DTL
HPRF system at klystron gallery(2nd floor)
RFQ HPRF pulse profile (400kW, 500us)Yellow : SSA
Red : ForwardBlue : ReverseGreen : Pick up
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Modulator
4 Modulators (Each modulator drives 2 or 3 klystrons)
Output peak power 5.8 MW, duty 9%, pulse width 1.5 ms, repetition rate 60Hz
Modulator at modulator room(3rd floor)
Modulator output pulse(3.2MW, 500us, 2Hz)
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RCCS
RCCS (Resonant Control Cooling System) for temperature control of DT.
Operation Range 21~33 C, Temperature Control < 0.1C11 sets for 11 DTL tanks
RCCS at klystron gallery(2nd floor)
RCCS water temperature at constant temperature mode
with full power DTQ
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Digital LLRF System
Phase variation during HPRF operationLLRF OPI based on EPICS
RF phase : < ±0.3 deg.
Goal : 1% in amplitude, 1 degree in phase
hardware : Commercially available FPGA board
software : PI implemented in FPGA and EPICS OPI
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Control System
EPICS based OPI Main Control Room
EPICS based system was developed for linac and beam lines.
Radiation monitoring system & personal safety interlock system are prepared.
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Beam Commissioning
Rough tuning by the radiation level along the linac and at the target room
Precise RF set points determination by the phase scan method
Beam phase measurement by BPM
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Beam at Target Room
Proton beams were delivered to TR23 and TR103.
Started user beam services from July 22, 2013.
TR103 TR23
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KOMAC Operation Schedule at 2013
Operation plan
- Machine study including beam commissioning : 9weeks
- User service : 14weeks
- Maintenance : 6weeks
* Most important goals in 2013 : facility inspection, user service start
Key milestones
- Facility inspection by KINS (June 26~27, July 18)
: Permission on 100MeV linac, TR23, TR103 (July 18)
- KOPUA meeting (July 5)
: Review of the beam user proposals
- Management committee meeting (July 11)
: Review of the operation and beam service plan
- Beam user service starts (July 22)
- Beam user service finish (December 20)
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KOMAC Operation in 2013
Accumulated time
- Operation time : 2,290 hrs
* Accelerator operation : Monday ~ Friday
Beam service
- Total number of samples : 937
TR20 / TR103 users ratio Users distribution Users application field
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Accelerator Downtime (1)
Before July 22, beam commissioning
From July 22, user beam service start
On December 20, user beam service finish
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Accelerator Downtime (2)
M02 A phase IGBT blasting
Utility
- Equipment wet at klystron gallery due to water gushed out of the nozzle for fire
extinguishing system (Shut down of vacuum, RF and control system)
- Cooling pump shut down due to momentary electrical power failure
- Radiation shielding door failure
Modulator
- IGBT blasting at low duty 500us, 2Hz
- Controller failure
- SCR firing circuit failure
- Oil pump failure
- Insufficient spare parts on the machine lead to long downtime
DTL / RF
- RF arcing at a power coupler
Ion source
- Solenoid failure
- Electromagnetic power supply failure
Floor in klystron gallery
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Plan for Beam Power Upgrade
Beam power upgrade goes with the target room construction
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SCL R&DSCL R&D
Design Forming E-beam welding Tuning
Cleaning Test preparation Test Test result
Eacc = 4.2 MV/m
For GeV extension of the linac, we performed R&D work of SCL cavity.
Prototyping the 700 MHz, 5-cell elliptical cavity with domestic company
Design, fabrication and test experience on the elliptical cavity
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Conclusion
Two of the most important goals in 2013 Facility inspection Beam service start
Now, Beam service in 2 target rooms Many troubles in the first year operation
: Valuable experiences for future operation
For the plan, Preparation of all target rooms for many applications GeV extension for pulsed neutron source
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Thank you.
www.komac.re.kr
1GeV