GL4

1K sorption cooler

Low-cost, easy to operate, reliable and effective. Our 1K sorption cooler modules interface to either a mechanical (GM/PT) cryocooler or the 4K plate of a ‘wet’ dewar. We can offer a number of interfacing options to accommodate a cold table housing the end-user application. Just contact us to discuss your requirements.
Popular applications for these sorption coolers include quantum computing, superconducting nanowire single-photon detectors (SNSPDs), superconducting electronics and semiconductor wafer testing. You won’t find a simpler way to reach temperatures below 1K.

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Standard GL4 — 10L

Overview

The GL4 is a single-shot sorption cooler, designed to interface to a low-power 4K precooler, such as a Gifford-McMahon (GM) cryocooler. It consists of a single stage 4He module, with the cold head of the system operating at 1K and below. A standard Small GL4 will run in excess of 24 hours under 100µW of thermal load at a temperature ≤1K. This system is highly adaptable and can be altered to handle heat loads in the milliwatt range.

The GL4 has no external gas handling or pumped gas circulation. The sorption cooler only requires electrical connections to the outside of the cryostat. A thermometry box is needed to measure the sensors along with a programable power supply to control the heaters.

Typical Load Response

Standard GL4 — 10L — Typical Load Response. Includes the supplied labels, units and annotations. Enlarge figure
Standard GL4 — 10L — Typical Load Response

Typical run

Standard GL4 — 10L — Typical run. Includes the supplied labels, units and annotations. Enlarge figure
Standard GL4 — 10L — Typical run

Typical cycle

Standard GL4 — 10L — Typical cycle. Includes the supplied labels, units and annotations. Enlarge figure
Standard GL4 — 10L — Typical cycle

GL4 Pin-Out

GL4 pinouts to 21-pin micro-D SSP
Function Type PIN # Drive current or voltage Resistance
4He HEAD RuO2 V+
4He HEAD RuO2 V-
4He HEAD RuO2 I+
4He HEAD RuO2 I-		 Resistance thermometer 1
12
2
13		 100nA AC
Or low voltage Driver e.g. V<0.5mV		 1kΩ
NC 3
DIODE FILM BURNER I+
DIODE FILM BURNER I-		 Diode thermometer 4
14		 10µA
DIODE MAINPLATE I+
DIODE MAINPLATE I-		 Diode thermometer 5
15		 10µA
DIODE 4He PUMP I+
DIODE 4He PUMP I-		 Diode thermometer 6
16		 10µA
DIODE 4He SWITCH I+
DIODE 4He SWITCH I-		 Diode thermometer 7
17		 10µA
NC 8
18
HEATER 4He SWITCH I+
HEATER 4He SWITCH I-		 Low power heater (a few mW) 9
19		 4 to 5 Volts 10kΩ
NC 10
20
HEATER 4He PUMP I+
HEATER 4He PUMP I-		 High power heater (up to about 2W) 11
21		 50 to 100 mA
15 to 30 V		 300Ω

Connector diagrams

Standard GL4 — 10L — Connector diagrams. Includes the supplied labels, units and annotations. Enlarge figure
Standard GL4 — 10L — Connector diagrams

Assembly diagram

Standard GL4 — 10L — Assembly diagram. Includes the supplied labels, units and annotations. Enlarge figure
Standard GL4 — 10L — Assembly diagram

Large GL4 — 33L

Overview

The GL4 is a single-shot sorption cooler, designed to interface to a low-power 4K precooler, such as a Gifford-McMahon (GM) cryocooler. It consists of a single stage 4He module, with the cold head of the system operating at 1K and below. A standard large GL4 will run in excess of 12 hours under 1mW of thermal load at a temperature ≤1K. This system is highly adaptable and can be altered to handle lower loads for far greater run times.

The GL4 has no external gas handling or pumped gas circulation. The sorption cooler only requires electrical connections to the outside of the cryostat. A thermometry box is needed to measure the sensors along with a programable power supply to control the heaters.

Typical Load Response

Large GL4 — 33L — Typical Load Response. Includes the supplied labels, units and annotations. Enlarge figure
Large GL4 — 33L — Typical Load Response

Typical run

Large GL4 — 33L — Typical run. Includes the supplied labels, units and annotations. Enlarge figure
Large GL4 — 33L — Typical run

Typical cycle

Large GL4 — 33L — Typical cycle. Includes the supplied labels, units and annotations. Enlarge figure
Large GL4 — 33L — Typical cycle

GL4 Pin-Out

GL4 pinouts to 21-pin micro-D SSP
Function Type PIN # Drive current or voltage Resistance
4He HEAD RuO2 V+
4He HEAD RuO2 V-
4He HEAD RuO2 I+
4He HEAD RuO2 I-		 Resistance thermometer 1
12
2
13		 100nA AC
Or low voltage Driver e.g. V<0.5mV		 1kΩ
NC 3
DIODE FILM BURNER I+
DIODE FILM BURNER I-		 Diode thermometer 4
14		 10µA
DIODE MAINPLATE I+
DIODE MAINPLATE I-		 Diode thermometer 5
15		 10µA
DIODE 4He PUMP I+
DIODE 4He PUMP I-		 Diode thermometer 6
16		 10µA
DIODE 4He SWITCH I+
DIODE 4He SWITCH I-		 Diode thermometer 7
17		 10µA
NC 8
18
HEATER 4He SWITCH I+
HEATER 4He SWITCH I-		 Low power heater (a few mW) 9
19		 4 to 5 Volts 10kΩ
NC 10
20
HEATER 4He PUMP I+
HEATER 4He PUMP I-		 High power heater (up to about 2W) 11
21		 50 to 100 mA
15 to 30 V		 300Ω

Connector diagrams

Large GL4 — 33L — Connector diagrams. Includes the supplied labels, units and annotations. Enlarge figure
Large GL4 — 33L — Connector diagrams

Assembly diagram

Large GL4 — 33L — Assembly diagram. Includes the supplied labels, units and annotations. Enlarge figure
Large GL4 — 33L — Assembly diagram
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