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rINSTCONTROL/@MyColdEdgeCryo/MyColdEdgeCryo.m
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MyColdEdgeCryo.m
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% Class for controlling the auto manifold of ColdEdge stinger cryostat.
% The manifold is managed by an Arduino board that communicates with
% computer via serial protocol.
classdef MyColdEdgeCryo < MyScpiInstrument & MyCommCont
properties (GetAccess = public, SetAccess = protected, ...
SetObservable = true)
% If a long term operation (e.g. starting a cooldown or pumping the
% capillary) is in progress
operation_in_progress
% Time for the recirculator to pump down helium from the capillary
% before closing it off
tr = 900
end
properties (Access = protected)
Timer
end
methods (Access = public)
function this = MyColdEdgeCryo(varargin)
this@MyCommCont(varargin{:});
this.Timer = timer();
% Buffer size of 64 kByte should be way an overkill.
this.Device.InputBufferSize = 2^16;
this.Device.OutputBufferSize = 2^16;
createCommandList(this);
end
function delete(this)
try
stop(this.Timer);
catch ME
warning(ME.message);
end
try
delete(this.Timer);
catch ME
warning(ME.message);
end
end
% Abort the current operation
function abort(this)
stop(this.Timer);
this.operation_in_progress = false;
this.auto_sync = false;
this.valve1 = false;
this.valve2 = false;
this.valve3 = false;
this.valve4 = false;
this.valve5 = false;
this.valve7 = false;
this.recirc = false;
this.cryocooler = false;
% Sync once
sync(this);
% Return to the hedged mode
this.auto_sync = true;
end
function startCooldown(this)
assert(~this.operation_in_progress, ['Cannot initiate' ...
' cooldown stop. Another operation is in progress.'])
this.auto_sync = false;
this.valve2 = false;
this.valve3 = false;
this.valve5 = false;
this.valve7 = false;
% Open the recirculator path, starting from the return
this.valve4 = true;
this.valve1 = true;
% Start the compressors
this.recirc = true;
this.cryocooler = true;
% Sync once
sync(this);
% Return to the hedged mode
this.auto_sync = true;
end
function stopCooldown(this)
function switchRecirculatorOff(~, ~)
this.auto_sync = false;
% Close the recirculator path, starting from the supply
this.valve1 = false;
this.valve4 = false;
% Switch off the recirculator after all the valves are
% closed
this.recirc = false;
sync(this);
this.auto_sync = true;
this.operation_in_progress = false;
end
assert(~this.operation_in_progress, ['Cannot initiate' ...
' cooldown stop. Another operation is in progress.'])
this.auto_sync = false;
% Switch off the cryocooler, close the recirculator supply
% valve (1).
this.valve1 = false;
this.cryocooler = false;
sync(this);
this.auto_sync = true;
% Wait for the helium to be pumped out of the capillary by the
% recirculator and then switch the recirculator off
this.Timer.ExecutionMode = 'singleShot';
this.Timer.StartDelay = this.tr;
this.Timer.TimerFcn = @switchRecirculatorOff;
start(this.Timer);
this.operation_in_progress = true;
end
% Overload writeSettings method of MyInstrument
function writeSettings(this)
disp(['The settings of ' class(this) ' cannot be loaded ' ...
'for safety considerations. Please configure the ' ...
'instrument manually'])
return
end
end
methods (Access = protected)
function createCommandList(this)
% Valve states
for i = 1:7
if i == 6
continue % There is no valve 6
end
tag = sprintf('valve%i',i);
cmd = sprintf(':VALVE%i',i);
addCommand(this, tag, cmd, ...
'format', '%b', ...
'info', 'Valve open(true)/clsed(false)');
end
addCommand(this, 'recirc', ':REC', ...
'format', '%b', ...
'info', 'Recirculator on/off');
addCommand(this, 'cryocooler', ':COOL', ...
'format', '%b', ...
'info', 'Cryocooler on/off');
addCommand(this, 'press', ':PRES', ...
'format', '%e', ...
'access', 'r', ...
'info', 'Supply pressure (PSI)');
end
end
methods
function val = get.operation_in_progress(this)
try
val = strcmpi(this.Timer.Running, 'on');
catch ME
warning(ME.message);
val = false;
end
end
end
end
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