Kirrily Rule 2013-04-09 16:47 The typical closed cycle cryo-furnace used on Taipan is cryo-furnace #1 (CF1). This uses a Lakeshore 340 controller. SICS is capable of reading and driving the temperature on this device. The Moxa box must be installed, and connected to the Lakeshore hardware. In the future, the Lakeshores will have a dedicated Moxa box. > tc1_driveable2 shows the sample temperature from channel A > run tc1_driveable 200 drives the regulation temperature (B) to 200K > wait 600 shows wait in seconds > drive tc1_driveable 200 drives the regulation temperature (B) to 200K and waits for it to be within 1K of this value before continuing to the next command >sct_ls340_tc1 send "RANGE?" this will query the heater power range – 0 = off, 5 = 100W >sct_ls340_tc1 send "RANGE 1" this will set the heater power range. Set to a value between 0-5 The fine control of the temperature parameters, such as tolerance, heater power range, etc, can be adjusted by clicking on the SIC Server tree view. Alternatively you can use certain commands listed below in a batch file: Check the heater power range of the closed cycle. To heat the sample relatively quickly you need to have the heater range to 5. To reach base temperature (10K or less), the heater range should be set to 4 or lower.

These detailed commands can be used (also in batch files) to control the temperature parameters: > hlist –val /sics/tc1/sensor shows set points and sensors etc > hget /sics/tc1/sensor/setpoint1 to show the temperature > hset /sics/tc1/sensor/setpoint1 200 to set the temperature to 200K – there is no blockage of the drive functions when this command is used > > hset /sample/tc9/Loop1/setpoint 200 to set the temperature of the 12T magnet to 200K > hget /sample/tc9/Loop3/sensor to read the temperature of the 12T magnet > hset /sics/tc1/heater/heaterRange 5 for 100W power, or 4 for 10W power > hset /sics/tc1/control/tolerance 1 5 to set the tolerance of 5K to reach desired temperature Sics and gumtree can also control the high voltage rig which is also set up on CF1. The following commands will be useful > pulseron turn on HV > pulseroff turn off HV > getvolt > setvolt 100 sets the voltage to 100V Once you have set your slits, turn the motion control OFF (on the same box as the shutter control) and unplug the 4 cables. Turn the motion control ON again. The slits are now in a safe mode for driving the field. To perform field ramps safely (without risk of quenching), you should put the beam stop down. To do this, turn the motion control OFF (on the same box as the shutter control), ramp the field into persistent mode and then turn the motion control ON again. Once you have reached your new field, drive to a new Q-E position to ensure that all the motors still behave correctly after the motion OFF. If not, you might have to reset particular motors: > m1 send RS (this will reset the m1 motor controller) To keep the beam stop down Turn off motion control Close valve located at the base of the beam stop Turn on motion control There are two parameters you will need for driving the s1 via the sample stick. vs1 drives the motor from the command line, while dummy_s1 is in the UB matrix and scan parameters. So use these in the following way: > drive vs1 30 (in the command line – this drives the motor to a value) > runscan dummy_s1 25 35 101 time 1 > runscan qh When running a powder sample in the magnet, fix dummy_s1 > dummy_s1 fix 1 (> dummy_s1 fix 0 to unfix)