This cryostat has been designed to minimise vibration and sample drift at stable and constant temperatures. This is achieved by cooling the sample on a stable cold platform rather than a cold finger and feeding the helium to the heat exchanger via a capillary thus isolating the helium flow vibration. The MicrostatHires2 is particularly well suited to sensitive applications such as micro-photoluminescence mapping of semiconductor microstructures with sub-micron spatial resolution.

• MICROHR2 Microstat HiRes2 microscope cryostat (requires a sample holder, a top plate and a bottom plate)
• Lateral sample drift at a constant temperature of 4.2 K, 0.15 micrometer per hour (typical)
• Lateral sample drift on cooling from 300 K to 4.2 K, 13.0 micrometers (typical)
• Sample working distance, minimum sample holder surface to window outer surface:
• 2.2 mm with 0.5 mm thick windows fitted
• 3.2mm with 1.5mm thick windows fitted
• Adjustable distance of top flange, 3.5 mm
• Sample holder diameter, 20 mm
• Temperature range
• 3.2 - 500 K (with GF4 pump)
• 2.7 - 500 K (with EPS40 pump)
• Temperature stability +/- 0.1 K using an ITC controller (measured over a 10 min period)
• Heat exchanger fitted with heater and 3 point calibrated rhodium iron temperature sensor
• Blanked off port for customer wiring
• Cool-down time from ambient with transfer tube cold, 15 minutes
• Helium consumption at 4.2 K, 0.75 l/hr using an LLT transfer tube
• Cryostat weight (including QOVC05HR2 and VH4HR2), 1.5 kg
• System may also be run with liquid nitrogen, temperature range 77 K- 500 K
• Copy of Oxford Instruments Safety Matters
• Operators manual
• All specifications refer to the standard system using an LLT transfer tube
• Notes:
• 1. Vertical Syphon entry arm available. Needs to be stated on order.
• 2. System will be tested with the ordered pump(s) only. In the case that no pumps are ordered then the system will be tested with a GF4 pump only.
• 3. OINS can only guarantee the performance below 3.0K if a 30 point calibrated RhFe sensor is purchased and fitted.
• 4. Vibration : The vibration of the type of cryostat being offered has been measured using a Leo 1450VP scanning electron microscope at our Instrumentation division at High Wycombe in England. The results obtained showed that under operating conditions, where all system components had been securely held, the vibration recorded was better than 20nm. As the vibration is very much dependant on the customers experimental environment and it is not a performance criteria that is measured as part of the standard factory test it would not be prudent for Oxford Instruments to guarantee a level of vibration. However although OINS cannot make a guarantee of performance we can state that the same design and build have been proven in the past to be capable of obtaining better than 20nm.