Effects of E-beam Parameters on Coherent Electron Cooling - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Effects of E-beam Parameters on Coherent Electron Cooling write by . This book was released on 2011. Effects of E-beam Parameters on Coherent Electron Cooling available in PDF, EPUB and Kindle. Coherent Electron Cooling (CeC) requires detailed control of the phase between the hadron an the FEL-amplified wave packet. This phase depends on local electron beam parameters such as the energy spread and the peak current. In this paper, we examine the effects of local density variations on the cooling rates for CeC. Coherent Electron Cooling (CeC) [1] is a new concept in intense, high energy hadron beamcooling, in which the Debye screened charge perturbation calculated in [2] is used to seed a high-gain free electron laser (FEL). Using delays to give the perturbing hadron an energy-dependent longitudinal displacement relative to its frequencymodulated charge perturbation, the hadron receives an energy-dependent kick which reduces its energy variation from the design energy. The equations of motion in [1] assume that the electron bunch is the same physical size as the hadron bunch, and has a homogeneous charge density across the entire bunch. In practice, the electron bunches will be much shorter than the hadron bunch, and this local spacial inhomogeneity in the charge distribution will alter the gain length of the FEL, resulting in both a change in the amplification of the initial signal and a phase shift. In this paper we consider these inhomogeneity effects, determining cooling equations for bunched beam CeC consistent with these effects and determining thresholds for the cooling parameters.
Influence of Electron Beam Parameters on Coherent Electron Cooling
Influence of Electron Beam Parameters on Coherent Electron Cooling - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Influence of Electron Beam Parameters on Coherent Electron Cooling write by . This book was released on 2012. Influence of Electron Beam Parameters on Coherent Electron Cooling available in PDF, EPUB and Kindle. Coherent electron cooling (CeC) promises to revolutionize the cooling of high energy hadron beams. The intricate dynamics of the CeC depends both on the local density and energy distribution of the beam. The variations of the local density (beam current) are inevitable in any realistic beam. Hence, in this paper we propose a novel method of beam conditioning. The conditioning provides compensation of effect from such variation by a correlated energy modulation. We use our analytical FEL model for an electron bunch with Gaussian line charge density and cosine-type energy variation along bunch. We analyze the phase variation between the electron density modulation at the exit of the FEL-amplifier and the ions inducing it in the modulator as a function of the peak current and the electron beam energy. Based on this analysis, electron bunch parameters for optimal CeC cooling are found numerically.
Simulation of electron beam dyanmics in the 22 MeV accelerator for a coherent electron cooling proof of principle experiment
Simulation of electron beam dyanmics in the 22 MeV accelerator for a coherent electron cooling proof of principle experiment - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Simulation of electron beam dyanmics in the 22 MeV accelerator for a coherent electron cooling proof of principle experiment write by Justin Owen. This book was released on 2013. Simulation of electron beam dyanmics in the 22 MeV accelerator for a coherent electron cooling proof of principle experiment available in PDF, EPUB and Kindle.
Towards Demonstration of Electron Cooling with Bunched Electron Beam
Towards Demonstration of Electron Cooling with Bunched Electron Beam - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Towards Demonstration of Electron Cooling with Bunched Electron Beam write by . This book was released on 2012. Towards Demonstration of Electron Cooling with Bunched Electron Beam available in PDF, EPUB and Kindle. All electron cooling systems which were in operation so far employed electron beam generated with an electrostatic electron gun in DC operating mode, immersed in a longitudinal magnetic field. At low energies magnetic field is also being used to transport electron beam through the cooling section from the gun to the collector. At higher energies (few MeV), it was shown that one can have simpler electron beam transport without continuous magnetic field. Because of a rather weak magnetic field on the cathode and in the cooling section the latter approach was referred to as 'non-magnetized cooling', since there was no suppression of the transverse angular spread of the electron beam with the magnetic field in the cooling section. Such a cooler successfully operated at FNAL (2005-11) at electron beam energy of 4.3 MeV. Providing cooling at even higher energies would be easier with RF acceleration of electron beam, and thus using bunched electron beam for cooling. Significant efforts were devoted to explore various aspects of such bunched electron beam cooling as part of R and D of high-energy electron cooling for RHIC. However, experimental studies of such cooling are still lacking. Establishing this technique experimentally would be extremely useful for future high-energy applications. Presently there is an ongoing effort to build Proof-of-Principle (PoP) experiment of Coherent Electron Cooling (CEC) at RHIC, which promises to be superior to conventional electron cooling for high energies. Since the CEC experiment is based on bunched electron beam and it has sections where electron beam co-propagates with the ion beam at the same velocity, it also provides a unique opportunity to explore experimentally conventional electron cooling but for the first time with a bunched electron beam. As a result, it allows us to explore techniques needed for the high-energy electron cooling such as 'painting' with a short electron beam and control of ion beam distribution under cooling which is essential if cooling is provided in a collider. The software needed for comparison with the experiments is already developed as part of the previous high-energy electron cooling studies for RHIC. Since electron beam will be non-magnetized and there will be no magnetic field in the cooling section it will be also a first demonstration of fully non-magnetized cooling. The purpose of these studies was to explore whether we would be able to observe conventional electron cooling with parameters expected in the CEC PoP experiment. Below we summarize requirements on electron beam and cooling section needed for such demonstration.
Analytical Studies of Coherent Electron Cooling
Analytical Studies of Coherent Electron Cooling - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Analytical Studies of Coherent Electron Cooling write by . This book was released on 2009. Analytical Studies of Coherent Electron Cooling available in PDF, EPUB and Kindle. Under certain assumptions and simplifications, we studied a few physics processes of Coherent Electron Cooling using analytical approach. In the modulation process, the effect due to merging the ion beam with the electron beam is studied under single kick approximation. In the free electron laser (FEL) amplifier, we studied the amplification of the electron density modulation using 1D analytical approach. Both the electron charge density and the phase space density are derived in the frequency domain. The solutions are then transformed into the space domain through Fast Fourier Transformation (FFT).
