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Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 20041
L0-1 Design, Manufacturing & TestingR. F. Boyce, SLAC
RF Technical Review, November 3, 2004
•L0-1 Design Specifications•Engineering Constraints and Assumptions•Engineering Drawings of New Input Cells
–Detail of RT geometry–Dual feed assembly
•Fabrication Process•Tuning the New Cells•Tuning the Dual Input High Power RF Circuit•Schedule•Summary and Conclusions
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 20042
L0-1 RF Design Specifications
Coupler Design For The LCLS Injector L0-1 Structure Zenghai Li, Lynn D. Bentson, David H. Dowell,
Cecile Limborg, John Schmerge, Liling XiaoLCLS Technical Report, in progress
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 20043
Engineering Constraints and Assumptions
Dual RF Input Feed (eliminates dipole kick)Race Track Design (eliminates quadrupole field)Solenoid has to fit over RF flanges and supportsModify an existing SLAC structure
Cut off two cells and replace with new coupler assembly
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 20044
A
A SECTION A-A
101.549O
29.1325.842
67.335
0.7874
R 3.0861 R 3.0861
26.21O
13mm.512in
O 71.68mm2.822in
O 71.68mm2.822in
O 101.55mm3.998in
92.08O
83.3O
92.13O
Dual Feed Parts: Race track cell and adjacent cell
SLAC Drawing PF-380-804-09
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 20045
36.505
8.687
C
C
O 7.126
Constraints on the Dimensions of the Solenoid
Outer radius
LengthInner diameter
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 20046
Procedure for Cutting Existing StructureIn 1985 Carl Rago shortened structures from 10 feet to 9 ½ feet as shown on SLAC Drawing SA-750-214-02
Cut the structure between the
irises and machine the end back to the iris
Their cuts Our cut
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 20047
New Coupler Assembly
Mating features will be identical to those used for the 9 ½ foot shortened structures.
Location of braze points for the tuning studs.
Mating surface to braze to the modified structure.
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 20048
Fabrication Process
Fabricate the parts and cut the existing structure
Cold RF test of parts before brazing dual feed sub assembly
Re-machine parts as required, iterate with cold tests
Braze dual feed subassembly
Cold test brazed subassembly with cut structure
Final braze of subassembly to cut structure
Final RF tests
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 20049
Tuning the L0-1 Structure
Proposed design with push-pull studs
NLC design using slide hammer studs
Standard SLAC technique using hydraulic pinch
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 200410
H
H
H
H
DETAIL I
Proposed L0-1 Tuning StudsThe studs are brazed to the wall of the cell and captured by a hollow adjusting screw which is turned in or out for the adjustment process.
Stud
Hollow screw
Threaded housing
Braze to copper cell
All tuning parts are stainless steel with silver plated threads
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 200411
NLC Standard HDDS Cell Tuning
The tuning stud is attached to a slide
hammer for the adjustment process
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 200412
Tuning of a Standard SLAC Structure
A hydraulic press was moved to each cell and pinched it according to a well know process.
This was done as part of a mass production procedure.
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 200413
Dual Feed RF High Power RF Circuit
Pumps
Directional Couplers
Supports
Dual input feeds are balanced on the bench and the Directional Coupler signals are recorded and documented for future checks.
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 200414
Tolerances on Dual Feed Waveguide and Coupling Holes
Table 1 The tolerance for the four coupler errors is listed. The tolerance is determined by either reducing the amplitude to 1% of its nominal value or the phase to 10% of its nominal value as listed in the last column.
Error Tolerance Defining Criteria Coupler Position < 1° Phase Coupler Iris Size D/D0 < .02 Amplitude RF Feed Amplitude V/V0 < .02 Amplitude RF Feed Phase < 3° Phase
Coupler Design For The LCLS Injector L0-1 Structure Zenghai Li, Lynn D. Bentson, David H. Dowell,
Cecile Limborg, John Schmerge, Liling XiaoLCLS Technical Report, in progress
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 200415
LCLS Injector and Linac Schedule
Gun and L0-1 needed for installation:October 2006
Richard F Boyce
Injector UpdateL0-1 Accelerator Structure [email protected]
3 November 200416
Summary and Conclusions
L0-1 accelerator sectionRF design finished
Engineering design in progress
Manufacturing processes are being researched
Completed accelerator section needed for October 2006 installation
