UniBEaM75 is a particle beam profiling system - similar to a wire scanner except an optical sensor fiber is used instead of a metal wire. Ø50 µm to 600 µm sensing fibers scintillate in the visible spectrum as they pass through the beam. The scintillation light is transmitted through the short sensor fiber into a standard multimode optical fiber, which transmits the light long distances with minimal attenuation and no electromagnetic susceptibility. The light is converted by a high-sensitivity photo sensor located in the UniBEaM controller, amplified, digitized, and displayed on a monitor. UniBEaM was conceived by the AEC-LHEP of the University of Bern and commercialized by D-Pace.
The system is a standalone device, requiring only the addition of a monitor and keyboard. A TCP/IP text-based command set is in development. This will allow UniBEaM to be used as a slave device to a higher-level controller or to interface with EPICS over Ethernet.
The probes are very compact, and require as little as 82 mm along the beam axis for the dual axis scanner. X and Y scans can be conducted individually or concurrently. UniBEaM offers significant advantages over conventional wire scanners.
- Measures beams from keV to GeV and pA to mA depending on the power density deposited
- Maximum beam diameter 75 mm
- Maximum Beam energy density 10 W/cm2
- No vacuum box required
- Insertion length of just 82 mm
- Scintillating sensor fibers
- Dual X & Y axis profiles
- In-plane scanning
- Radiation resistant – no electronics in the probe
- Low electromagnetic susceptibility
- Complete turnkey system
D-Pace offers the following beamline mounting options for UniBEaM75:
1) Direct Mount ISO 100-F Option. D-Pace provides two ISO-F flanges which screw directly to the aluminum vacuum box of UniBEaM75. This mounting option requires 82 mm in the beam axis. (See D-Pace Drawing 1800736)
2) CF100 Option. D-Pace provides the UniBEaM probe with two CF100 flanges (outside diameter 6"). This option requires an insertion length of 122 mm in the beam axis.
The user controls the scan start and end positions, position resolution and scan speed. Single or continuous scans can be acquired. Each pass of the fiber can be displayed separately, or overlain in persistent display mode. The fiber scanning speed is adjustable to a maximum speed of 18 mm/sec. A delay period can be entered which pauses the fiber at the extents at its travel to allow the fiber too cool between passes through the beam. Slowing the scanning speed enables greater signal averaging for improving the signal-to-noise ratio of low beam currents. The software also calculates the beam position based on first moments and the integral of the profile. Profiles are saved in a CSV format file along with software parameters and user comment fields.
The software also has a fixed position mode, which enables the operator to move the fiber to a fixed position, and the software will plot the beam intensity versus time at this position. The plot format is a strip chart, where the chart window period can be set by the operator. Sampling rates up to 1000 Hz are achievable in this mode.
The following is a link to a Bachelor Thesis entitled “Study of a novel compact beam line at a medical cyclotron”, which was authored by Diana Wüthrich, and performed at the Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics, University of Bern, under the supervision of Dr. Saverio Braccini. This thesis describes testing conducted on D-Pace’s MiniPET beamline, including the use of the UniBEaM beam profiler to verify beam tunes.
- 2020 - Ce- and B-Doped Silica Fibers for Monitoring Low-Energy Proton Beams on a Medical Cyclotron
2018 - Characteristics of a Ce-Doped Silica Fiber Irradiated by 0 - 400 MeV Neutrons
2018 - A system for online beam emittance measurements and proton beam characterization
2018 - Radiation hardness of Ce-doped sol-gel silica fibers for high energy physics applications
2018 - Characteristics of a Ce-Doped Silica Fiber Irradiated by 74 MeV Protons
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