Status of X-band program at RadiaBeam
Luigi Faillace
RadiaBeam Technologies, LLC.
Santa Monica, CA
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
ABOUT RADIABEAM
• RadiaBeam Technologies, LLC. is a small business
with core expertise in accelerator physics.
• Spin-off from UCLA (2003)
• Extensive R&D Program (DOE, DOD, DHS, NSF)
• Growing products line for research laboratories and
industrial customers (magnets, diagnostics, RF
structures, complete systems)
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
ONGOING PROJECTS
 X-Band Traveling Wave Deflector
 High Gradient S-Band Linac (DECA)
 Sincrotrone Trieste Photoinjector
 Compact Industrial Linacs
(MicroLinac, Blood Irradiator)
 2 NCRF Guns based on Free-Form
 Fabrication (FFF)
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
MICROLINAC
• Tech transfer from SLAC
• Portable, air-cooled, ultra-low cost, 1 MeV (two
structures operating in pi mode, 9.4 GHz)
• industrial accelerator for radiography applications
(replacement for radioisotope sources)
Accelerating
structure
Magnetron
2.5 μs, D.C.=10-3
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
MICROLINAC
• Table-top prototype is under development
• Industrial system to be offered in 2011-2012
• Higher energy version for self contained irradiators
under development
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
MICROLINAC
Electric
Field (MV/m)
Magnetic
Field (Gauss)
Accelerating gradient
3 MV/m
RF frequency
9.4 GHz
Power dissipated/structure 25 kW
Beam Current, input
50 mA
Duty Cycle
0.001
Beam Energy, input
14 keV
MICROLINAC
Transverse size
Energy gain
Beam capture
25 %
Beam energy, exit
>1 MeV
Normalized transverse
emittance
Blood Irradiator
•
•
Industrial accelerator for
blood irradiation, 2 MeV
Pi/2 accelerating
structure, 9.3 GHz
X-BAND DEFLECTING CAVITY
• compact footprint, 11.424 GHz
• longitudinal resolution at 100 MeV better than 10 fs
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
X-BAND DEFLECTING CAVITY
• Present Status: in fabrication
• Adapted cleaning and handling procedures from
SLAC (developed for high gradient structures)
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
X-BAND DEFLECTING CAVITY
• 8 cells + couplers prototype was assembled and
tested
• Commissioning plans at BNL – Summer 2011
(bead pull measurements at RadiaBeam )
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
RF TESTING/VALIDATION CAPABILITIES
• Single Cell Testing
 Used for relative cell to
cell analysis
• Cell Stack
 Utilized for resonant
frequency verification
• Clamped structure
 Validates coupler
quality
 utilized in bead pull /
tuning setup under
development for
tuning
Phase
Bead-pull measurements
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
SOLID FREEFORM (SFF) FABRICATION
• SFF is an additive manufacturing process where end-use, metal, parts are
directly fabricated, layer by layer, from a digital model
• SFF produces fully-dense metal parts with features such as internal cooling
channels
• SFF copper cathode cathode recently successfully tested at UCLA’s Pegasus
photoinjector under high RF power
 Stable operation at 70 MV/m peak fields on cathode after 2 hours of
conditioning
 QE measured (~2x10-5), and consistent with wrought OFE copper at
given gradient
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
RESOURCES AND CAPABILITIES
 Enhanced engineering/manufacturing capabilities
 New Facility + recent expansion
 New Equipment
 Studied and Developed RF manufacturing process workflows
 Increased RF testing/validation capabilities
 Developed custom UHV/RF component cleaning and assembly facilities
 Following SLAC developed guidelines
 Presents us with full control over almost all critical processes (no oven)
 Collaborations with Universities and National Laboratories
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
CELL MACHINING AND CLEANING
 CNC mills and lathes
 Capable of 0.0002” precision and






repeatability (lathe)
2-4 micron flatness
4-6 micro-inch surface finishes (100-150nm)
Developed specialized workholding tooling
Optimized cutting tooling (PCD)
Refurbished or manufactured storage and
travel containers
Considerable man-hours invested into
process and handling systematics
 Chemical cleaning room
 With guidance from SLAC MFD
 Utilize a modified version of SLAC
cleaning processes
 Clean Assembly / Testing
Room
 Class 100 / Class 1000
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
CONCLUSIONS
• RadiaBeam Technologies is actively developing Xband accelerating systems for commercial
applications
• First high gradient structure will be commissioned
this year
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program