Cryocooler XV
Cryocooling of optics and insertion devices is common on beamlines of third and fourth generation synchrotron sources where high powers (wigglers) or power densities (undulators) can cause exceptional distortion, resulting in degradation of the beam.
When a monochromator crystal is heated, thermal gradients are set up across the crystal which cause it to distort, affecting the optical performance. These effects can be minimised by optimising the cooling of the crystal. Cryogenic cooling of monochromator optics has advantages over simple water cooling, as the ratio of the coefficient of thermal expansion, α, to thermal conductivity, k, for silicon, is significantly smaller at liquid nitrogen temperature. Distortions of the crystal due to thermal gradients are therefore reduced if the crystal is cooled to around 100K.
Cryocooler XV
The Cryocooler XV is a fully automatic, high pressure, super cooled liquid nitrogen cooler designed to remove heat from a load via a closed circuit. The Cryocooler XV is a full-featured automated cryocooler allowing complete flexibility in remote operation.
The Cryocooler XV is particularly suited to cooling monochromator crystals. It is possible to optimise the cryocooler settings for your specific cooling and stability requirements. Flow rate, pump frequency and pressure can all be independently adjusted to achieve thermal and mechanical stability at the crystal.
The cryocooler XV is also we suited for the next generation of cryocooler undulators.
Industry Leading Performance
The Cryocooler XV has been designed and developed with the specific goal of creating the best performing cryocooler on the market. As a result, the Cryocooler XV features industry-leading pressure stability, operating pressure and cooling power.
Key Technical Features
Best-in-Class Stability and Low Vibration
- Best-in-Class Stability and Low Vibration and ease of use
- 12 bar system pressure for low vibration operation up to 107K crystal temperatures
- Independently adjustable pressure, pump speed and flow rate for suppressing mechanical resonances
- Flow optimized internal pipework for low turbulence circulation
User Friendly Control System
- Siemens S7 based PLC control
- EPICS Interface as standard
- Touchscreen control via intuitive graphical interface
- Remote control of all operation parameters
- Integrated EPS
Reliable with Low Ongoing Operation Costs
- Industry-proven component suppliers
- Low static LN2 consumption
- Fully-stocked spares catalogue for fast response
- Maintenance contracts available
Specifications
| Operating Pressure | 1 — 12 bar |
| Pressure Stability | < 1 mbar (RMS) |
| Cooling Power | 0 — 3000W |
| Cooling Temperature | 78 — 107 K |
| Temperature Stability | < 0.025 K (RMS) |
| Pump Speed | 15 — 90 Hz |
| Flow Rates | 0.5-20 l/min |
| Electrical Supply | 220V / 16A 3 Phase 208 V / 32A Single Phase |
| Pneumatic Air | 6 barg |
Options
- Standard or extra-large capacity dewar
- Bespoke super-insulated vacuum line solutions
- Splitters for controlling two loads
- Standalone or rack-integrated controls
Cryocooler XV Controls
The XDS Cryocooler XV is designed to run unattended after the initial clean connection, with a fully automated cool-down process through to stable and configurable Run state. The low-pressure LN2 dewar level is monitored by a level probe and topped up from the main LN2 supply system via a pneumatic valve. The control system consists of a 19” rack with a programmable logic controller (PLC) which performs the real-time control and monitoring operations. A Linux PC hosts the EPICS IOC and a local copy of the user interface. If the PC fails while the cryocooler is running, the PLC operation of the cryocooler will continue unaffected. Only the user interaction will be affected.
If power is lost to the entire system, when power is restored, it will automatically attempt to recover to the last operating state.
The user interface presents an interactive overview of the cryocooler, with separate screens for viewing the configuration, physical IO, and the Warning/Alarms
To allow the cryocooler to operate as a standalone unit, local data collection generates a daily csv file, the data is auto-archived monthly to minimise storage. This data can be viewed using python Trendviewer application.
XDS Oxford has a long history of developing optical components for the third-fourth generation light sources and at the new ultra storage rings and FELs. The complete range of capabilities of the Cryocooler XV has been demonstrated experimentally at beamlines across the world, with multiple installations at facilities including MAX IV, DLS, NSLS-II, ALS, APS, CHESS, CLS, SLAC, PSI, SSRF, HEPS, USTC, NSRRC, ESRF, DESY, EuXFEL.
