Leaders in Synchrotron beamline systems and components

QBPMs

Quadrant Beam Position Monitor (QBPM)

The QBPM range of beam position monitors are capable of providing a beam position accuracy of less than 2 microns. QBPM technology is based on an array of 4 large area photodiodes to capture solid angle fluorescence from scintillating foil. The use of different foils allows the QBPM to be used over a range of energies.

This concept is licensed from Argonne National Laboratory and base of design work carried out by R.W. Alkire, G Rosenbaum and G. Evans.

HV QBPM

The High Vacuum Quadrant Beam Position Monitor (HV QBPM) is designed for monochromatic X-rays focused to an experimental station.  Coupling this device with one of our 4-channel current amplifiers provides a beam positional accuracy of less than 5 microns. The system has pneumatic foil insertion to allow the scintillation foil to be moved in and out of the beam as required.

For ease of installation the system comes in 3 standard configurations; KF40, KF50 and BPC.  We also have adapters available to convert from KF40 to BPC (Male or Female).

DescriptionHV Pneumatic
QBPM KF40
HV Pneumatic
QBPM BPC
HV Pneumatic
QBPM KF50
Part Number AHQ0555AHQ0556AHQ1723
Beam apertureDiameter 10mm
Helium leak rate<2 x 10-8 mbar l/sec
VacuumHV compatible <5x10-7 mbar
Pneumatic pressure range 2 bar to 7 bar
Pneumatic air connection6mm tube
Solenoid connector24 VDC (1.2W) at 50 mA Flying leads
Width62mm75mm
Height218.3mm
Length113.9mm100mm113.9mm
Mounting flangesKF40BPCKF50

UHV QBPM

The Ultra High Vacuum Quadrant Beam Positioning Monitor (UHV QBPM) provides beam positioning accuracy of less than 5 microns as well as beam intensity measurements when paired with one of our 4-channel current amplifiers. The QBPM is used on insertion device beamlines with monochromatic beam, we also offer a Dual Beam Position Monitor (DBPM) to provide vertical positioning on Bending Magnet Beamlines

All UHV systems have an  stepper driven foil changer; the foil changer can house two scintillation foils allowing different foils to be used for the photon emission optimisation of a varying beam intensity.

The UHV QBPM comes in two standard conflat sizes 6″ DN100CF160 and 8″ DN160CF200. On top of this they also come in two positions “Straddled” and Non-Straddled”

Description UHV QBPM DN100CF6”UHV QBPM DN100CF6”
Part Number AQM0017
Beam apertureDiameter 10mm
Helium leak rate<1 x 10-9 mbar l/sec
VacuumUHV compatible <1x10-9 torr
Vertical translation of array DriveManual micrometer
Range ±4.5mm±10mm
Resolution25µm25µm
Horizontal translation of array DriveManual micrometer
Range ±4.5mm±10mm
Resolution25µm25µm
Foil holderDriveStepper motor
Stroke50mm50mm
Resolution5µm5µm

UHV DBPM

We also offer a Dual Beam Position Monitor (DBPM) to provide vertical positioning on Bending Magnet Beamlines. The DBPM uses an array of diodes mounted above and below the beam which provides vertical positional feedback. The position of the array within the conflat can be moved vertically via a micrometer. The foil holder position can be adjusted via a stepper motor.

Description UHV DBPM
Part Number AHQ0490
Beam aperture40mm Horizontal x 8mm Vertical
Helium leak rate<1 x 10-9 mbar l/sec
VacuumUHV compatible <1x10-9 torr
Vertical translation of array DriveManual micrometer
Range ±4.5mm
Resolution25µm
Foil holderDriveStepper motor
Range 50mm
Resolution5µm

Foils

FMB Oxford offer a range of foil materials and thicknesses suitable for use with the diode array beam position monitors. The table below provides a guide for selecting the appropriate foils. Speak to us if you require a foil not listed.

When selecting foils we recommend adding .5 keV to the Kα1 emissions to ensure a detectable signal.

KOZT00180.5 µm Al foil 
KOZT00161.0 µm Al foil
KOZT00212.0 µm Al foil
KOZT00225.0 µm Al foil
KOZT00060.5 µm Ti foil
KOZT00111.0 µm Ti foil
KOZT00121.0 µm Ti foil
KOZT00080.5 µm Cr foil
KOZT00141.0 µm Cr foil
KOZT00130.5 µm Fe foil
KOZT00090.5 µm Ni foil
KOZT00151.0 µm Ni foil
KOZT00191.0 µm Au foil
KOZT00204.0 µm Au foil
KOZT00231.5 µm Au foil

X-Ray Emissions Energies

Foil materialKa, (kev)
Al1.49
Ti 4.51
Ch 5.41
Fe 6.40
Ni 7.48
Au 68.79