Modified 12/31/2015 .

Janis Low Temperature CCR Manual

Startup: 

1. Attach sample in desired holder using 10-32 screws. 

2. Confirm that Sensor A is working properly, by touching the sensor and watching 

the value increase on the Lakeshore controller.

3. Screw on the inner and outer heat shields, being careful not to over tighten them. 

This is best done by screwing on the shield all the way and then loosening 1⁄4 turn. 

4. Attach the outer vacuum can using 1⁄4-20 screws or the clamps provided. Make sure 

the O-ring is properly greased and set in the groove.

5. Connect the vacuum port to a turbo pump. Pump the chamber down to 10-4Torr.

6. Plug the communications cable from the ICP/ICE computer to the serial 

connection on the back of the Lakeshore controller. Turn on the compressor by 

turning the Main Power switch clockwise and flipping the Drive switch UP.

7. Set the control temperature to any desired temperature below 200 K. 

Allow Sensor A to cool below 200 K before applying any heat.

Operation: 

 The compressor should remain ON at all times, especially when applying heat, 

unless changing sample as in the instructions below.

 Leave the turbo pump ON constantly for all temperatures above 200 K.

 If the compressor stops running, turn off the heater and contact User Services.

Shutdown or Change of Sample 

 Turn OFF the compressor. 

 Leave the heater ON with a set point of 300 K. 

 Close the vacuum port valve and turn off the pump. Wait until the turbo pump is

OFF before removing the hose. 

 Flush the chamber with Helium: 

o Attach a hose barb on a KF-25 flange to the vacuum port.

o Flush the low pressure Helium line and hose barb, and connect them.

o Pinch the line one arm-span from the valve. 

o Open the valve slightly and then close it quickly. There is now enough 

gas inside to effectively exchange heat between hot and cold areas.

o Wait 45-60 minutes for the cold stage (Sensor A) to reach room 

temperature.

 Once the Sensor A approaches room temperature, you can open the outer cover

without the risk of ice buildup inside the CCR.

 Press HEATER OFF on the Lakeshore 340 controller.
Modified 12/31/2015 .

CCR Cold Head

 

Vacuum Valve

Vacuum Valve

Optional Clamps for 

vacuum shroud

Vacuum Shroud with 

square base

Attach to instrument 

with (4) 1⁄4-20” bolts

Compressor Air Intake 

Do Not Block

4He flexlines with optional 

90 degree elbows

Lakeshore Controller, 

back view

Thermocouple for 

over-temperature 

protection

Cold Head power cable

Sensor and Heater 

19-pin feedthrough

Lifting eyes (2)

Use yellow sling

Over-Pressure safety 

valve, do not tamper
Modified 12/31/2015 .

 

CCR Compressor

Compressor Air Exhaust

Do Not Block

Lakeshore Controller, 

front view

Compressor power 

cable, plug into 60A, 

3-pase outlet

Compressor On/Off 

switches System 4He pressure gauge

Cold Head power cable

(1) Rotate Main Power Clockwise 

to point UP

(2) Flip drive switch UP

4He Flexlines Return & Supply

Omega Controller, for overtemperature protection

This is how the compressor 

looks when it is powered ON

Solenoid valve indicator

It is normal for this to 

cycle on and off during 

initial cooldown.