1 A ug 2 00 0 COMPRESSION OF HIGH - CHARGE ELECTRON BUNCHES ∗
نویسندگان
چکیده
The AØ Photoinjector at Fermilab can produce high charge (10-14 nC) electron bunches of low emittance (20π mm-mrad for 12 nC). We have undertaken a study of the optimal compression conditions. Off-crest acceleration in the 9-cell capture cavity induces an energy-time correlation, which is rotated by the compressor chicane (4 dipoles). The bunch length is measured using streak camera images of optical transition radiation. We present measurements under various conditions, including the effect of the laser pulse length (2 ps sigma Gaussian vs. 10 ps FWHM flat top). The best compression to date is for a 13.2 nC bunch with σ z = 0.63 mm (1.89 ps), which corresponds to a peak current of 2.8 kA.
منابع مشابه
Compression of High-charge Electron Bunches
The AØ Photoinjector at Fermilab can produce high charge (10-14 nC) electron bunches of low emittance (20 mmmrad for 12 nC). We have undertaken a study of the optimal compression conditions. Off-crest acceleration in the 9-cell capture cavity induces an energy-time correlation, which is rotated by the compressor chicane (4 dipoles). The bunch length is measured using streak camera images of opt...
متن کاملMicrobunch Amplification in the European XFEL
Linac-based X-ray-free-electron lasers (XFELs) require very short bunches of highbrightness electron beams with peak currents of the order of kilo-Amperes. These bunches cannot be produced directly in guns because space charge forces would destroy the brilliance within a short distance [1]. Increasing bunch peak currents with longitudinal compression at beam energies high enough to suppress spa...
متن کاملThe Plasma Wake Field Accelerator*
A new scheme of electron acceleration, employing relativistic electron bunches in a cold plasma, is analyzed. The wake field of a leading bunch is derived in a single-particle model. We then extend the model to include finite bunch length effect. In particular, we discuss the relation between the charge distributions of the driving bunch and the energies transformable to the trailing electrons....
متن کاملNovel Schemes for the Narrow Band Sparc Thz Source Using a Comb like E-beam
The development of radiation sources in the THz spectral region has become more and more interesting because of the peculiar characteristics of this radiation: it is non ionizing, it penetrates dielectrics, it is highly absorbed by polar liquids, highly reflected by metals and reveals specific "fingerprint" absorption spectra arising from fundamentals physical processes. The THz source at SPARC...
متن کاملComplicated Bunch Pattern in Pep-ii*
PEP-II, the asymmetric B-Factory at SLAC, has delivered a luminosity of 3.1 · 10 cm s. This was achieved with 692 bunches in a basic "by-3" bunch pattern. Many gaps in the bunch train were necessary to suppress a blow-up of the positron beam due to an electron cloud instability (ECI). The actual pattern had 10 bunches in a row (every third bucket), then 6 bunches missing. This 48-bucket long pa...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2000