1 research outputs found
Development of an X-band Photoinjector at SLAC
As part of a National Cancer Institute contract to develop a compact source
of monoenergetic X-rays via Compton backscattering, we have completed the
design and construction of a 5.5 cell Photoinjector operating at 11.424 GHz.
Successful completion of this project will result in the capability of
generating a monoenergetic X-ray beam, continuously tunable from 20 - 85 KeV.
The immediate goal is the development of a Photoinjector producing 7 MeV, 0.5
nC, sub-picosecond electron bunches with normalized RMS emittances of
approximately 1 pi-mm-mR at repetition rates up to 60 Hz. This beam will then
be further accelerated to 60 MeV using a 1.05 m accelerating structure. This
Photoinjector is somewhat different than the traditional 1.5 cell design both
because of the number of cells and the symmetrically fed input coupler cell.
Its operating frequency is also unique. Since the cathode is non-removable,
cold-test tuning was somewhat more difficult than in other designs. We will
present results of "bead-drop" measurements used in tuning this structure.
Initial beam measurements are currently in progress and results will be
presented as well as results of RF conditioning to high gradients at X-band.
Details of the RF system, emittance-compensating solenoid, and cathode laser
system as well as PARMELA simulations will also be presented.Comment: 3 pages, 6 figures, 1 Table, LINAC 200