Beamline components

RF current monitoring for machine protection.

Dymenso developed radio-frequency cavity average current monitors for the LCLS-II project at SLAC National Accelerator Laboratory.

Dymenso average current monitor during radio-frequency cold testing
RF cold test of a 1.3 GHz average current monitor sensor.
Sensor frequency
1.3 GHz
Accelerator
4 GeV CW linac
Primary function
Beam-power protection

Machine protection

Current measurement becomes a beam-power limit.

The LCLS-II upgrade adds a 4 GeV continuous-wave superconducting linear accelerator within the first kilometer of the SLAC linac tunnel, supplementing the existing pulsed accelerator.

Average current monitors are positioned where beam energy is known or constrained. The system calculates beam power from measured current and known energy, then trips the beam when power exceeds the permitted value—protecting downstream beam dumps from excessive loading.

01Measure current

An RF cavity sensor monitors average electron-beam current.

02Calculate power

Current is combined with the known beam energy at the sensor location.

03Protect hardware

The safety system interrupts the beam when calculated power is too high.

Component engineering

RF, thermal, and mechanical behavior resolved together.

The ACM program connected electromagnetic performance to mechanical design, thermal response, fabrication, assembly, and RF test.

Cutaway and insulated assembly views of the average current monitor

Mechanical architecture

Partial cutaway of the sensor and the completed ACM assembly with thermal insulation installed.

Radio-frequency and thermal simulation results for the average current monitor

Coupled simulation

RF and thermal analyses informed the cavity geometry and operating design.

Develop a component around your beamline.

Talk with Dymenso about RF performance, thermal management, vacuum interfaces, fabrication, and verification.

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