XBPM full unit
XBPM full unit
XBPM 3D-model
XBPM 3D-model
XBPM unit
XBPM unit
XBPM top terminal
XBPM top terminal
XBPM insert
XBPM insert
Single XBPM blade array
Single XBPM blade array
Blade array sketch
Blade array sketch
Double XBPM blade array
Double XBPM blade array
XBPM Beam Position Monitor

Technische Beschreibung:

FMB has experience in building blade type X-ray beam position monitors (XBPMs). XBPMs made by FMB are widely used at many synchrotrons to measure the photon beam position at the micron level.

XBPMs made by FMB are widely used at many synchrotrons to monitor the photon beam position vertically and horizontally at the micron level for beam stabilization purposes.
The FMB XBPM design is a joint development of Karsten Holdack (HZB, formerly BESSY) and FMB.
A typical FMB XBPM system consists of a XBPM insert, a vacuum chamber, a motorized precision X-Z stage, a X-Y-Z manual alignment assembly and a support. In addition FMB offers motion control hardware and software and signal processing / analysis electronics on request.

The XBPM beam position monitors use four blades, whose narrow fronts are oriented towards the radiation source. The blades are symmetrically arranged on a virtual X with its center close to the center of the radiation beam. With this blade setup the operator is able to scan the off-axis radiation of the source and determine on-line the horizontal and vertical position of the radiation source centre from the emitted signals.
Size and geometry of the blades will be adapted to the beam characteristics at the place of the position monitor in order to achieve a maximum photocurrent yield at a maximum sensitivity. The blades are made of Tungsten and cooled via heat conducting ceramics to resist the thermal load of the radiation source.


Technische Daten:

SPM insert     
Type   Staggered blade pairs beam position monitor
Number of blades   4
Blade material   Copper / Tungsten
Aperture / blade opening,   Suggested by FMB,
blade thickness / pair offset   dependent on beam specifications at installation position 
Cooling   Water cooling
Temperature measurement   Thermocouple K-type close to aperture
Electrical strength    500 V
Feedthroughs   Triax, miniature TC flat pin (others on customer request)
Base flange   DN 150 CF fixed
Fiducials   2 / 3 / 4 Hubbs or laser tracker supports at base flange
Pinhole array (optional)   Design according to customer requirements,
0.02 mm min. pinhole diameter dependent on foil thickness
SPM chamber    
Chamber / flange material   1.4301 / 1.4429 (similar 304 / 316LN)
Beam entrance /exit flange   DN 40 CF or different on customer request
SPM insert flange    DN 150 CF fixed, oriented with respect to SPM insert
Additional flanges   Optional on customer request
Column material   Steel (Invar on request)
Fill   Dry sand
Manual chamber alignment   Lateral ± 20 mm, vertical ± 12.5 mm, resolution. (l, v) < 0.1 mm
Alignment via X-Z-stage   Lateral (X) ± 5 mm, vertical (Z) ± 5 mm,
(optional)   repeatability ± 10 µm (± 1 µm with optional encoder)


Datenblatt XBPM_Beam_Position_Monitor

September 21, 2022
Detektoren & Diagnostische Komponenten
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