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Presentation Instructions
AAC'04 Agenda
AAC'04 Poster
Organizing Committee
Workshop Working Groups

















Workshop Working Groups

Diagnostics, Control and Synchronization
Group-leader: Pat Colestock LANL (colestock@lanl.gov)
Co-Group-Leader: Ralph Fiorito UMd (rfiorito@umd.edu)

In this working group study, we will review three issues of advanced accelerators: beam diagnostics, beam source characterization, and control, synchronization and monitoring.

After reviewing the state of the art in beam diagnostic techniques, this group will confront the challenge of improving the the 6D phase space diagnostic resolution by a factor of ten, for low, medium, and high energy beams. The WG will also identify the ultimate limit in measuring and controlling the synchronization of two events in space, time and frequency. (can we measure beam properties with sub-micron, sub-10 fs accuracy?)

Depending on the beam’s properties one would like to study (charge/current, spatial profile, divergence, emittance, temporal length, temporal shape, energy, energy spread, etc.) one would use different diagnostics. Diagnostic techniques can be either field based or radiation based. Few diagnostics can provide the beam’s phase space properties directly. Most will require some data processing, which could be subject to human interpretation. For plasma advanced accelerators, one would also want to know the characteristics of the plasma through which the beams propagate.

Beam characterization at the sources is the single most important step in understanding the mechanisms of beam quality degradation. Beam’s quality varies significantly from one source to another and depends intricately on sources’ operating conditions. We will review standard emittance measurement techniques and analyze their capabilities and limitations. Another important feature of low-energy beams is space-charged induced effects such as transverse plasma oscillation, a potential source of confusion for emittance measurement. Longitudinal space charge effects such as virtual cathode formation and longitudinal beam breakup have been experimentally observed. Finally, halo formation is another topic of great interest (or concern) as halos can lead to significant beam losses.

Control, synchronization and monitoring are crucial if the beams are to be used in conjunction with the rest of the world. RF control and synchronization are probably perfected by now, and so are laser timing control and synchronization. Nevertheless, control and synchronization of the RF and laser together have not been that easy. Adding the beams to this mix only compounds the problems. We will review the state of the art of timing control and synchronization. We will also study beam monitoring at low, medium and high energy, with an emphasis on stray particle management.

We will tailor the invited talks to match the above categories. We will accept contributed papers in the above areas as well as other related topics. We will ask participants of this working group to appoint a “spokesperson” for each of the above categories. The spokespersons will document all information relevant to their respective areas. At the end we will review the information with the spokespersons and ask for their assessments. At the close-out, the spokespersons will present the assessments of their respective issues to the working group and open the floor for discussion. Finally, the chairperson and the deputy will summarize the working group findings.