Quadrant Beam
Position Monitor
(QBPM)
Our range of Quadrant Beam Position Monitors are based around an array of four large area photodiodes which capture solid angle fluorescence from scintillating foils, providing a beam position accuracy of less than 2 microns with 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.
UHV QBPM
The Ultra High Vacuum QBPM (UHV QBPM) is designed for use with monochromatic X-rays. This system uses Stepper Motors for vertical and horizontal movement, and for the foil changer.
This system provides beam positioning accuracy of less than 5 microns and, when paired with our I404 4-channel current amplifier, it also provides beam intensity measurements.
A stepper motor driven foil changer can house two 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 DN100CF150 6" and DN160CF200 8" and are set to a “Straddled” position.
Specifications
| Description | UHV QBPM DN100CF150 6” | UHV QBPM DN160CF200 8” |
|---|---|---|
| Part Number | AQM0017 | AQM0362 |
| Beam aperture | Diameter 10 mm | Diameter 10 mm |
| Helium leak rate | <1 x 10-9 mbar l/sec | <1 x 10-9 mbar l/sec |
| Vacuum | UHV compatible <1x10-9 torr | UHV compatible <1x10-9 torr |
| Vertical translation of array (Drive) | Stepper Motor | Stepper Motor |
| Range | ± 5 mm | ± 5 mm |
| Resolution | 10 µm | 10 µm |
| Horizontal translation of array (Drive) | Stepper Motor | Stepper Motor |
| Range | ± 5 mm | ± 5 mm |
| Resolution | 10 µm | 10 µm |
| Foil holder (Drive) | Stepper Motor | Stepper Motor |
| Range | + 20 mm, - 17.5 mm | + 20 mm, - 17.5 mm |
| Resolution | 5 µm | 5 µm |
HV QBPM
The High Vacuum QBPM (HV QBPM) is designed for monochromatic X-rays and uses a Pneumatic insertion system to allow the scintillation foil to be moved in and out of the beam as required.
Coupling this device with one of our 4-channel current amplifiers provides a beam positional accuracy of less than 5 microns.
This system comes in 3 standard configurations; KF40, KF50 and BPC.
Adapters are available to convert from KF40 to BPC (Male or Female).
Specifications
| Description | HV Pneumatic QBPM KF40 | HV Pneumatic QBPM BPC | HV Pneumatic QBPM KF50 |
|---|---|---|---|
| Part Number | AHQ0555 | AHQ0556 | AHQ1723 |
| Beam aperture | Diameter 10mm | Diameter 10mm | Diameter 10mm |
| Helium leak rate | <2 x 10-8 mbar l/sec | <2 x 10-8 mbar l/sec | <2 x 10-8 mbar l/sec |
| Vacuum | HV compatible <5x10-7 mbar | HV compatible <5x10-7 mbar | HV compatible <5x10-7 mbar |
| Pneumatic pressure range | 2 bar to 7 bar | 2 bar to 7 bar | 2 bar to 7 bar |
| Pneumatic air connection | 6mm tube | 6mm tube | 6mm tube |
| Solenoid connector | 24 VDC (1.2W) at 50 mA Flying leads | 24 VDC (1.2W) at 50 mA Flying leads | 24 VDC (1.2W) at 50 mA Flying leads |
| Width | 62mm | 62mm | 62mm |
| Height | 218.3mm | 218.3mm | 218.3mm |
| Length | 113.9mm | 100mm | 113.9mm |
| Mounting flanges | KF40 | BPC | KF50 |
HV DBPM
The Dual Beam Position Monitor (DBPM) provides vertical positioning for Bending Magnet Beamlines and uses an array of diodes mounted above and below the beam to capture solid angle fluorescence from scintillating foil. This system uses an Pneumatic insertion system to allow the scintillation foil to be moved in and out of the beam as required.
The detector comes with KF40 connectors as standard. Adapters are available to convert from KF40 to BPC (male and female).
Specifications
| Description | HV Pneumatic DBPM |
|---|---|
| Part number | AHQ0190 |
| Beam aperture | 10 mm |
| Helium leak rate | < 2 x 10-8 l/sec |
| Vacuum | HV compatible < 5 x 10-7 mbar |
| Pneumatic pressure range | 2 bar to 7 bar |
| Pneumatic air connection | 6 mm tube |
| Solenoid connector | 24 VDC (1.2 W) at 50 mA Flying leads |
| Width | 62 mm |
| Height | 218 mm |
| Length | 100 mm |
| Mounting Flange | KF40 |
Adapters
| Male KF40 to BPC | Female KF40 to BPC |
|---|---|
| AHQ2131 | AHQ0581 |
UHV DBPM
The Ultra High Dual Beam Position Monitor provides vertical positioning for Bending Magnet Beamlines. The UHV DBPM uses an array of diodes mounted above and below the beam to capture solid angle fluorescence from scintillating foil.
The detector head is built into a DN100CF150 6" conflat in a Straddled position, with the foil holder position adjustable via a Stepper Motor.
The position of the array within the conflat can be moved vertically via a Stepper Motor.
Specifications
| Description | UHV DBPM DN100CF150 6" |
|---|---|
| Part Number | AHQ0490 |
| Beam aperture | 40mm Horizontal x 8mm Vertical |
| Helium leak rate | < 1 x 10-9 mbar l/sec |
| Vacuum | UHV compatible < 1x10-9 torr |
| Vertical translation of array (Drive) | Stepper Motor |
| Range | ±4.5mm |
| Resolution | 25µm |
| Foil holder (Drive) | Stepper Motor |
| Range | 50mm |
| Resolution | 5µm |
Foils
XDS Oxford offer a range of foil materials and thicknesses suitable for use with the diode array beam position monitors.
Please refer to the table below as 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.
Specifications
| Part Number | Description | HV QBPM | UHV QBPM | HV DBPM | UHV DBPM |
|---|---|---|---|---|---|
| KOZT0018 | 0.5 µm Al foil | ✔ | ✔ | ||
| KOZT0016 | 1.0 µm Al foil | ✔ | ✔ | ||
| KOZT0021 | 2.0 µm Al foil | ✔ | ✔ | ||
| KOZT0022 | 5.0 µm Al foil | ✔ | ✔ | ||
| KOZT0006 | 0.5 µm Ti foil | ✔ | ✔ | ||
| KOZT0011 | 1.0 µm Ti foil | ✔ | ✔ | ||
| KOZT0012 | 1.0 µm Ti foil | ✔ | ✔ | ||
| KOZT0008 | 0.5 µm Cr foil | ✔ | ✔ | ||
| KOZT0014 | 1.0 µm Cr foil | ✔ | ✔ | ||
| KOZT0013 | 0.5 µm Fe foil | ✔ | ✔ | ||
| KOZT0009 | 0.5 µm Ni foil | ✔ | ✔ | ||
| KOZT0015 | 1.0 µm Ni foil | ✔ | ✔ | ||
| KOZT0019 | 1.0 µm Au foil | ✔ | ✔ | ||
| KOZT0020 | 4.0 µm Au foil | ✔ | ✔ | ||
| KOZT0023 | 1.5 µm Au foil | ✔ | ✔ |
X-Ray Emissions Energies
| Foil material | Kα, (kev) |
|---|---|
| Al | 1.49 |
| Ti | 4.51 |
| Cr | 5.41 |
| Fe | 6.40 |
| Ni | 7.48 |
| Au | 68.79 |
