Fel Gain Length and Taper Measurements at Lcls
نویسندگان
چکیده
We present experimental studies of the gain length and saturation power level from 1.5 nm to 1.5 Å at the Linac Coherent Light Source (LCLS). By disrupting the FEL process with an orbit kick, we are able to measure the X-ray intensity as a function of undulator length. This kick method is cross-checked with the method of removing undulator sections. We also study the FEL-induced electron energy loss after saturation to determine the optimal taper of the undulator K values. The experimental results are compared to theory and simulations.
منابع مشابه
Coherent Radiation Effects in the Lcls Undulator∗
For X-ray Free-Electron Lasers such as LCLS and TESLA FEL, a change in the electron energy while amplifying the FEL radiation can shift the resonance condition out of the bandwidth of the FEL. The largest sources of energy loss is the emission of incoherent undulator radiation. Because the loss per electron depends only on the undulator parameters and the beam energy, which are fixed for a give...
متن کاملStatus of the LCLS X-Ray FEL Program
The Linac Coherent Light Source (LCLS) program involves a collaboration of several US National Laboratories and universities with the goal of designing and building the first 4-generation hard x-ray source, an x-ray free-electron laser (FEL). This FEL will utilize extremely short, intense, low-emittance electron pulses created by the high-energy linear accelerator at the Stanford Linear Acceler...
متن کاملR&d towards a Delta-type Undulator for the Lcls*
The LCLS generates linearly polarized, intense, high brightness x-ray pulses from planar fixed-gap undulators. While the fixed-gap design supports a very successful and tightly controlled alignment concept, it provides only limited taper capability (up to 1% through canted pole and horizontal position adjustability) and lacks polarization control. The latter is of great importance for soft x-ra...
متن کاملInvestigation of Beam Alignment Monitor Technologies for the LCLS FEL Undulator?
To maintain gain in the proposed 100 m long linac-driven Linac Coherent Light Source (LCLS) Free Electron Laser (FEL) undulator, the electron and photon beams must propagate colinearly to within -5 urn rms over distances comparable to the 11.7 m FEL gain length in the 6 mm diameter undulator vacuum chamber. We have considered a variety of intercepting and non-intercepting position monitor techn...
متن کاملX-ray Pulse Duration Control in the LCLS
X-ray pulse duration control is critical to exploring the ultra-fast science at an x-ray freeelectron laser (FEL) facility such as the Linac Coherent Light Source (LCLS). The pulse length of a typical electron bunch that drives a self-amplified spontaneous emission (SASE) FEL is limited to the order of 100~200 fs, due to short-bunch collective interactions. Many novel schemes have been proposed...
متن کامل