Low Temperatures

CCR – Closed Cycle Cryostats

The CCR is a top loading device. The sample tube is filled with exchange-gas. Temperature regulation is achieved by a sensor and a heater attached to the sample tube. The sample holder is in general mounted to a sample stick. Temperatures ranging from 3.5 K to RT can be regulated. To reach for temperatures above RT to 700 K the sample space has to be evacuated and a special high-temperature sample-stick has to be used (available for CCR 9-11 and JTC 1-4). For this case temperature control is provided by a heater and sensor mounted on the sample stick.

Specifications

	CCR 7-9	JTC 1-4	JVC 1-2
Common features
Temperature range (K), with exchange in sample gas	2,8 – 300	3 – 300	1.5 – 300
Extended temperature range (K), evacuated sample space and HT sample stick	T < 700 K	T < 700	-
Cool down time of cryostat: 300 K – base temperature (h)	min. 2.5	min. 2.5	min. 0.7
Cool down time for sample change with cryostat at base temperature (h)	< 1.5	< 1.5	min. 0.7
Dimensions
Diameter of sample space (mm)	< 50 and < 80	< 60	< 50
Height of sample space (beam window) (mm)	~ 75	~ 100	~ 50
Available sample sticks
Standard stick for T (K)	< 300	< 300	< 300
High temperature stick for T (K)	< 700	< 700	-
Rotation sample stick to provide sample rotation with fixed cryostat position	available	-	-
Gas adsorption stick	available	-	-
High voltage stick	available	available	-
High pressure sample stick for gas pressure cells (max. 4 kbar)	available	-	-

CCI – Low Temperature Inserts

To reach temperatures below 3 K CCI – ³He and CCI – ³He/⁴He insert cryostats for the CCR systems CCR 9-11 as well as JKC 1-2 – ³He/⁴He for the cryostats JVC 1-2 are available. Please note an additional preparative time of up to 4h is needed before first cool-down.

Specifications

	CCl – ³He	CCl – ³He/⁴He	JKC1-2 – ³He/⁴He
Temperature range	450 mK – 10 K	50 mK – 1 K	20 mK – 1 K
Cool-down time (h)	5	7	6
Diameter of sample space (mm)	30	30	30
Total height of sample space (mm)	145	70	100
Distance cold plate to beam level (mm)	106.5	27	80

CC – Closed Cycle Cryostats

The sample space of these liquid-cryogen free closed-cycle cryostats is inside the isolation vaccum. The thermalisation of the sample is achieved by the thermal conductivity of the sample holder and the cold-plate. To avoid temperature gradients a sample mounting with adequat thermal conductivity is needed. In case of sample with poor thermal conductivity, the usage of an exchange-gas (He) containing sample can or the use of a CCR-type cryostat should be considered.

Specifications

	CC 1-4	CC 5-6	CC -7-CCM	CC 8-10	JCC 1-3
Temperature range (K)	2.8 – 300	2.2 – 300	2.2 – 300	2.8 – 600	3 – 300
Cool down time 300 K – 2.8 K (h)	2.5	2	4	5	2.5
Cool down time 600 K – 2.8 K (h)	-	-	-	5	-
Diameter of sample space (mm)	60	10	55	< 138 (CC-8); < 55 (CC-9, CC-10)	80
Total height of sample space (mm)	110	10	85	< 136 (CC-8); < 85 (CC-9, CC-10)	100