Test Beams and Polarized Fixed Target Beams at the NLC

A conceptual program to use NLC beams for test beams and fixed target physics is described. Primary undisrupted polarized beams would be the most simple to use, but for NLC, the disrupted beams are of good enough quality that they could also be used, after collimation of the low energy tails, for test beams and fixed target physics. Pertinent issues are: what is the compelling physics, what are the requirements on beams and running time, and what is the impact on colliding beam physics running. A list of physics topics is given; one topic Moller Scattering is treated in more depth.Comment: 10 pages, 5 figures, Fifth International Linear Collider Workshop (LCWS2000), Fermi National Accelerator Laboratory, Batavia, Illinois, US, October 24-28, 200

Some solved and more unsolved problems in giant resonance research

Invited Seminar given at the 11th Masurian Summer School in Nuclear Physics, Mikolajki, Masuria, Poland August 30 - September 10, 1978A review of the main existing (e,e') data on the giant resonance region of atomic nuclei is given Open and controversial questions are pointed out. While most of the examples are taken from the Monterey data, which in fact constitutes the largest body of such data, experiments from Darmstadt, Saskatoon and Sendai have been incorporated in the systematics.National Science FoundationNaval Postgraduate School Research FoundationResearch supported by the National Science Foundation and the Naval Postgraduate School Research Foundation

Resume of Rainer Pitthan, 1973

Naval Postgraduate School Faculty Resum

Group T6/www/program/

Future colliders with their µm-range operational tolerances still need to be classically aligned to the 50- 100 µm range, and kept there, over the km range. This requirement will not be a show-stopper, but not be trivial either. 50 µm ground movements over a betatron wavelength is a the range where systematic long term motions can prevent efficient operation. 1. GROUND MOTIONS AND ALIGNMENT Ground Motions and their impact on Accelerators have first, as a separate scientific topic in its own right, been brought into the conscience of Accelerator Physicists by G.E. Fischer. Summaries of his work, which covered the frequency range from the very fast to the very slow, can be found in [1] and references therein. He was the first to point out that compared to the sub-micron vibration stability requirements of future accelerators any ground would be like butter and nothing would be rigid, pointing to problems in operating the machines. He also noticed that there were areas in accelerator tunnels which moved unidirectional with many microns aday,upto10µm, at SLAC [2]. Fischer was very aware of the need for specific concepts and methods in Alignment for Linear Colliders [3]

Space charge dynamics of bright electron beams

The longitudinal dynamics and its coupling with the transverse dynamics of bunched beams with strong space charge are analyzed. We introduce a self-consistent Vlasov description for the longitudinal phase space similar to the familiar description for the transverse phase space using a Kapchinskij-Vladimirskij distribution. A longitudinal beam envelope equation is derived. An exact solution is then obtained when coupling to the transverse dynamics is ignored. This longitudinal envelope equation is coupled to the transverse envelope equation to form a set of coupled dynamical equations, which is then solved numerically. This analysis is prompted by the surprising results of recent experiments which showed that by driving an intense laser pulse into matter, which in turn creates a plasma, short bright relativistic electron bunches are produced, surprisingly narrowly focused. We find that because the space charge forces weaken with increasing transverse and longitudinal phase space, both the transverse and longitudinal emittance blowouts anticipated of bright compact bunches are mitigated by this coupling. It should be possible to capture these bunches into an rf cavity to accelerate to higher energies