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3 Entries
Linda Raffel
January 20, 2020
David was my lovely neighbor on Santa Ynez st at Stanford. We had good chats at neighborhood parties and
during walks. I'm sorry I only found out about his passing today. I would certainly have attended his memorial service. So good it was at the family home with his loving family. He will be joining his dear Italian wife.
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Ida & Marcello Piccolo
December 27, 2019
We had the privilege of working with David in the MAC experiment at SLAC, and subsequently becoming friends of the Ritson family.
David was an exceptional physicist: he was always ahead of everybody else in grasping the issues, and always original in finding solutions. During our career, we had the chance to work with several Nobel laureates and other prominent figures in Particle Physics; David was the only one with whom we often found ourselves dreading that he would immediately notice a flaw in our reasoning. We were not the only ones intimidated by his brainpower: often at a conference or seminar, David would open his eyes after apparently dozing off and surprise the speaker with a very sharp question. We felt the greatest satisfaction when he would come back to us after a discussion and say: we are on the same wavelength.
A vivid memory we have of David as a great physicist, is when he walked into our office at SLAC, went to the blackboard, mumbling something we did not fully understand, and writing some math. His point was that the PEP's vacuum chamber did not have to be so wide, and a diameter of 3-4 cm would be enough for the machine to run. He was right, as usual, and the consequence was a revolution in machine and detector design: it was the start of the era of the vertex detectors positioned very close to be interaction point, and therefore able to measure particles' decay points with much higher precision.
We admired David as a physicist, and we really loved him as a human being; we cherished his friendship, and shared many family gatherings, both at Stanford and at Frascati. We had the pleasure to have both him and Edda as our guests in Italy; they were happy to spend some time in Frascati, where David also helped with the local accelerator, or to stop by before going to visit relatives in Tuscany. In the last few years, we would visit him every time we came to Palo Alto and enjoy discussing his new interest in global warming, or the status of Particle Physics today. We will miss him very much!
Marcello & Ida Piccolo
Alex Read
December 19, 2019
I was a PhD student on the MAC experiment in the early 1980's. Although I was from a different university and we didn't work directly together, Dave wrote me a very nice letter of recommendation that I am sure helped me get my first job and my career off to a great start. Dave is one of my absolute physics heros: He was a nice, mild-mannered man, a great particle physicist, I known he made some key contributions to at least 2 accelerators, and he wrote the most amazing beautiful FORTRAN code (for the MAC straw vertex detector) I have ever seen. My strongest memory is of him standing up in a MAC collaboration meeting, walking up to the screen where someone was showing a diagram of the detector, and telling us that our top priority should be to install a vertex detector where he was pointing. I don't remember the subject of the presentation but I am pretty sure we were not discussing the potential benefits of a vertex detector! The room went quiet. Sure enough, not extremely long after this meeting, the collaboration went all-in to build the vertex detector and it was a great success for the experiment.
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