Oxford Helium Cryostat
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Manuals
On the Internal 11BM Staff staff SVN repository here:
ordering Liquid Helium
call Mary Berryman (FMS) on 2-3440 by 11 AM the day before to order Helium for next day delivery
normally order 100 L dewer
leave a message if no answer; give name, full cost code, badge number, delivery location (433)
factory default PID info
Wiring Notes
PinDiagram_MaileView_10pin_Winchester.png
Sample Stick A: Auxiliary
Pins A,B,C,D = Phytron Stepper Motor
Motor Phase = Motor Wire = 10 Pin = Connector Wire = Elco
1+ red A white A
2+ blue B black C
1- yellow C red E
2- green D brown H
not used E
not used F
Pins H, J, K, L = Diode Temp Sensor
Diode = Diode Wire = 10 Pin = Connector Wire
V+ red H green
V- white J white
I+ red/black K red
I- white/black L black
Sample Stick B: Auxiliary
none
LakeShore Diode - ITC Sensor 3
Diode = Diode Wire = DB9 Pin = ITC = Connector Wire V+ red 2 Input Low green V- white 1 Input High white I+ red/black 4 Current +ve red I- white/black 5 current -ve black
Sensor 1 Notes
Heaters (x2) + RhFe Resistor
Wiring Pin Function A --> Heater + (x2, running in parallel) B --> Heater - C --> V+ Resistor D --> V- Resistor E --> I+ Resistor F --> I- Resistor H --> ? J --> spare K --> ? L --> ?
Pin Resistance - NEW Cryostat Pins Expected (Ohm) Measured (April 2011) A-B --> 15-25* 36 C-D --> 30-40 34.5 C-E --> < 15 5.2 C-F --> 30-40 34.6 E-F --> 30-40 34.6 A-C --> > 1 M open A-GND --> > 1 M open C-GRN --> > 1 M open * according to Oxford, each heater is 68 Ohm. Running parallel (1/R1+1/R2 = 1/Rtotal) gives Rtotal expected = 34 Ohms
Pin Resistance - OLD Cryostat Pins Expected (Ohm) Measured (April 2011) A-B --> 15-25 36.5 C-D --> 30-40 35.5 C-E --> < 15 6.0 C-F --> 30-40 35.5 E-F --> 30-40 35.5 A-C --> > 1 M open A-GND --> > 1 M open C-GRN --> > 1 M open
Transfer Line
On Cryostat - Inner Dimensions (receptacle on the cryostat)
<------- 38 cm ------->
<- 25 cm ->
<- 13 cm -->
///
===========
===========
===========
===========
===========
===========
\\\
Transfer Line Stick Dimensions (when compression fitting correctly positioned)
<----- 36 cm ----->
<8 cm > <8 cm >
///
=======
=======
||====
======= ^
======= ^ |
\\\ | |
He return feed
Python Control Software
SetupCryostat()
in robot.py
Set up Oxford ITC503 Cryostat to default parameters
def SetupCryostat(sensor=2, tries=5)
sensor: sensor # to control against: 1=gas inlet; 2=cold block (default); 3=spare
tries: number of repeats to try when sending the command before giving up (default is 5)
GetCryostatT()
in robot.py
Read Oxford ITC503 cryostat temperatures
def GetCryostatT(tries=5)
input: number of times to attempt read (defaults to 5)
returns a list of 3 temperatures: sensor1, sensor2, sensor3
SetCryostatT()
in robot.py
Set Oxford ITC503 setpoint and optionally hold for temperature
def SetCryostatT(setpoint, WaitFlag=True, Delay=5, MaxWait=120, DeltaT=2, tries=5):
setpoint (K) -- desired end T
WaitFlag (default=True) -- if True the routine will return once the temperature is reached (default),
False means return immediately after setting the ramp to begin
Delay (min) -- period of time to wait after initially reaching the desired temperature in min (default is 5)
MaxWait (min) -- maximum period to wait for the selected sensor to reach the Set Point in min.
If this period expires, an exception is thrown (defaults to 120)
DeltaT (K) -- allowed discrepancy between the selected sensor and the desired T to start the delay period (defaults to 2)
tries -- number of repeats to try when sending the command before giving up (defaults to 5)
SweepCryostatT()
in robot.py
Sets Oxford ITC503 setpoint and optionally hold for temperature
def SweepCryostatT(startpoint, endpoint, sweeptime, WaitFlag=False, MaxWait=1.25, tries=5):
startpoint (K) -- desired start T for Temp
endpoint (K) -- desired end T
sweeptime (min) -- desired time for change from startpoint to endpoint (minutes)
WaitFlag (default=False) -- if True the routine will return once the temperature is reached,
False means return immediately after setting the ramp to begin (default)
MaxWait (ratio) -- maximum period to wait for the sweep to complete as a ratio of the sweep time.
Default is 1.25, meaning to wait 125% of sweeptime,
If this period expires, an exception is thrown.
tries -- number of repeats to try when sending the command before giving up (defaults to 5)
Example Code
s11bmwork% /APSshare/bin/python
Python 2.5.2 (r252:60911, Jan 28 2009, 15:33:22)
[GCC 4.1.2 20070626 (Red Hat 4.1.2-13)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path.append('/local/11BMcontrol/MailIn')
>>> import robot
>>> robot.GetCryostatT()
(1.3999999999999999, 407.80000000000001, 273.39999999999998)
>>>
>>> robot.gui.Sleep(1) >>> robot.SweepCryostatT(1,2,1) False True False >>> robot.SweepCryostatT(1,2,1,WaitFlag=True) True False >>>
