The detector caught them cleanly, producing sharp signals better than anyone had predicted.
At the edge of what human instruments can perceive, a team of physicists from across California and New Mexico has built a detector capable of catching particles that arrive and vanish within a trillionth of a second. Tested last summer at SLAC National Accelerator Laboratory, the diamond-based system resolves a fundamental mismatch between the speed of next-generation science and the slowness of the tools meant to observe it. It is, in a quiet way, a story about how measurement itself must evolve before understanding can follow.
- The next generation of particle accelerators will fire beams at one million pulses per second — nearly ten thousand times faster than current machines — and no existing detector could keep pace.
- A multi-institution collaboration spanning two UC campuses and three national laboratories spent years rebuilding the entire detection chain from the ground up, using artificial diamond sensors and custom-designed microchips.
- When tested against real electron bursts at SLAC last July, the system produced signals so precise and so well-matched to theory that the team described the results as stunning — a rare alignment of prediction and reality.
- A second-generation system with an upgraded integrated circuit is already in development and expected to enter testing by fall 2026, pushing signal response even faster.
- The technology is now being eyed for applications well beyond accelerators — from high-energy physics and fusion energy to laser systems — with ambitions to make it simple enough for nonspecialist labs to deploy.
Last July, physicists at UC Santa Cruz aimed a new detector at a stream of electrons fired from SLAC National Accelerator Laboratory. The electrons arrived in bursts lasting one picosecond — a trillionth of a second. The detector caught them cleanly, producing sharp signals roughly one-eighth of a nanosecond long. It worked better than anyone had predicted.
The achievement was years in the making. The Advanced Accelerator Diagnostics Collaboration — drawing together two UC campuses and three national laboratories spread across California and New Mexico — had formed around an urgent problem: the next generation of particle accelerators would operate at one million pulses per second, compared to the 120 pulses per second of current machines. Existing detection systems were simply too slow to follow.
Solving it meant rethinking everything. The team built sensors from artificial diamond, a material that responds quickly and cleanly to charged particles, and designed custom microchips to read those signals in real time. Bruce Schumm, the Long Family Professor of Experimental Physics at UC Santa Cruz, was direct about the stakes of the collaboration: remove any single partner — Lawrence Berkeley Lab, Los Alamos, UC Davis — and the whole effort would have collapsed. The work was published in Physical Review Accelerators and Beams.
The motivation runs deeper than engineering. Next-generation accelerators promise to illuminate biological and chemical processes at atomic scales and across vanishingly brief time intervals, advancing materials science and energy research. But those machines are only useful if researchers can measure, diagnose, and control what the beams are actually doing — a gap this detector is built to fill.
Tested against thousands of electron bursts under varying conditions, the system performed with what Schumm called stunning accuracy, its real-world behavior matching theoretical predictions almost perfectly. A second version, featuring an upgraded integrated circuit designed for even faster signal response, is expected to begin testing in fall 2026. Beyond accelerators, the team envisions the technology finding use in high-energy physics, advanced laser systems, and fusion energy — and eventually becoming simple enough for nonspecialist laboratories to use as a plug-and-play diagnostic tool.
Last July, physicists at UC Santa Cruz pointed a new kind of detector at a stream of electrons fired from SLAC National Accelerator Laboratory. The electrons arrived in bursts lasting just one picosecond—a trillionth of a second. The detector caught them cleanly, producing sharp, well-defined signals about one-eighth of a nanosecond long. It worked better than anyone had predicted.
This was the culmination of years of work by the Advanced Accelerator Diagnostics Collaboration, a partnership between two University of California campuses, three U.S. national laboratories, and teams spread across California and New Mexico. They had set out to solve a problem that was becoming urgent: the next generation of particle accelerators would fire beams not at 120 pulses per second, as current machines do, but at 1 million pulses per second. The existing detection systems couldn't keep up. They were too slow, too blind to the rapid-fire nature of what was coming.
The solution required rethinking the entire detection chain. The team built a sensor from artificial diamond—a material that responds quickly and cleanly to charged particles. They designed custom microchips to read the signals coming from that diamond. They developed new ways to process those signals in real time. Bruce Schumm, the Long Family Professor of Experimental Physics at UC Santa Cruz, emphasized that none of this would have been possible without the full weight of the collaboration. "If you took away Lawrence Berkeley Lab, if you took away Los Alamos, if you took away UC Davis, any of those, the whole thing would have fallen apart," he said. The work was published in Physical Review Accelerators and Beams.
Why does this matter? Next-generation accelerators will reveal fundamental processes in biology and chemistry that happen at atomic scales and over impossibly short time intervals. They will advance materials science and energy research. But to use these machines effectively, researchers need to measure what the beams are doing—to diagnose them, control them, and help experimenters make sense of the data they collect. "Nobody was building things that can measure, diagnose the beams and help control the accelerator, and also help the experimenters to unravel the data," Schumm explained. This detector fills that gap.
The system tested at SLAC last summer represents the best-performing high-bandwidth particle detection system built to date. When the team exposed it to thousands of electron bursts under varying conditions, the detector performed with what Schumm called "stunning accuracy"—its real-world behavior matched theoretical predictions almost perfectly. A second version is already in development, with an upgraded integrated circuit chip designed to squeeze even faster signal response from the tiny diamond sensor. That version is expected to enter testing in fall 2026.
The implications extend beyond accelerators. The technology could eventually be adapted for high-energy physics experiments, advanced laser-control systems, and fusion-energy development. The team also hopes to make it simple enough that nonspecialist laboratories can use it as a plug-and-play diagnostic tool. As Schumm noted, the frontier of modern science increasingly demands the ability to see and measure what happens at the atomic scale, across time intervals so brief they barely exist. This detector is built for exactly that work.
Citas Notables
If you took away Lawrence Berkeley Lab, if you took away Los Alamos, if you took away UC Davis, any of those, the whole thing would have fallen apart.— Bruce Schumm, UC Santa Cruz
It performed extremely well, better than we expected. And not only that, but if we compare the performance to our pure calculation expectations, they agree with stunning accuracy.— Bruce Schumm, UC Santa Cruz
La Conversación del Hearth Otra perspectiva de la historia
Why does it matter that the detector works at a million pulses per second instead of 120?
Because the new accelerators will actually fire at that rate. If your detector can only see 120 pulses and the machine is sending a million, you're blind to 99.988 percent of what's happening. You can't diagnose the beam, can't control it, can't help the scientists using it make sense of their data.
What makes diamond the right material for this?
It responds very quickly to charged particles and produces clean signals. When an electron passes through, the diamond reacts in a way that's sharp and well-defined, not fuzzy or delayed. That speed matters when you're trying to measure events that last picoseconds.
The article mentions this is a collaboration between universities and national labs. Why was that necessary?
The problem was too big for any one institution. You need the accelerator expertise of the national labs, the research infrastructure, the specialized fabrication capabilities. You need multiple universities bringing different perspectives. Schumm was clear: if any major partner had dropped out, the whole thing would have collapsed.
What does "stunning accuracy" mean in this context?
Their theoretical calculations predicted how the detector would perform. When they tested it, the real results matched those predictions almost perfectly. That's rare. Usually there's some gap between theory and practice. Here there wasn't.
What happens next?
They're building a second version with an even faster chip. It goes into testing this fall. But longer term, they want to make it simple enough that any lab can use it, not just specialists. And they're exploring whether it could work in fusion research, laser systems, other high-energy physics applications.
Does this change what scientists can actually discover?
Yes. If you can't measure what's happening at atomic scales across picosecond timescales, you can't study those processes. This detector opens a door that was previously closed.