The 46th ICFA Advanced Beam Dynamics Workshop HB2010 took place from September 27 to October 1, 2010 in Morschach, Switzerland. This fifth meeting in a series of workshops focusing on High Brightness, High Intensity Hadron Beams was hosted by the Paul Scherrer Institute, PSI. The workshop venue was embedded in a beautiful landscape 200m above Lake Lucerne. The program of the last day was held at PSI including a visit to the accelerator facilities.

The scientific program covered recent experimental and theoretical advances associated with high intensity and high brightness hadron beams. The number of participants, 167, was larger than that of previous workshops and demonstrating a rising interest in the field of high intensity facilities. On the first day a plenary program was presented, including 8 invited talks. In the afternoon a poster session took place with 54 posters and intense discussions among the participating scientists. In parallel a dedicated session was held on the fast advancing field of laser plasma acceleration and applications of high intensity lasers in the field of accelerators in general. The three days, Tuesday to Thursday were filled with presentations and discussions in the seven working groups. The program was organized in two parallel sessions and 102 oral presentations were given in total.

The majority of the papers at HB2010 were devoted to beam dynamics problems in circular and linear accelerators and simulation methods to treat such problems. However, technical themes such as accelerator system design, operational aspects and beam instrumentation were discussed as well. A newly established working group on beam material interaction covered aspects related to targets and collimators, such as particle transport calculations, energy deposition and cooling, material activation and radiation damage.

It is the interaction of the experts in these quite different and specialized fields that makes the HB workshop series so valuable for the development of high intensity hadron accelerators. Many open discussions in a pleasant environment and in meeting rooms that matched the number of participants contributed to the success of the workshop. The participants also enjoyed the little excursion to the mountain village Stoos, where the workshop dinner was held in a rustic restaurant with traditional Swiss music and demonstrations of the famous alpine horns.

The workshop proceedings are provided electronically on the well established JACOW website for accelerator related conferences. Selected papers are to be published in longer versions in a special edition of Physical Review Special Topics - Accelerators and Beams with Andreas Adelmann, PSI, acting as the editor.

I would like to thank all participants for their excellent presentations, all conveners for setting up a well balanced and interesting program, my colleagues of the organizing committee at PSI for investing a lot of work in the organization of the workshop. I also thank the editors of the proceedings who carefully processed the majority of the papers already at the workshop.