LOQ Instrument Details - ISISComputingGroup/ibex_developers_manual GitHub Wiki

This page collects information that will be useful for the implementation of the IBEX control system on LOQ.

LOQ is a time-of-flight SANS instrument instrument at ISIS, on TS1. The LOQ web page describes the background to the instrument.

It has 3 collimation apertures (only A2 is computer-controlled), 4 monitors (insertion/removal of M3 is computer-controlled), and 2 detectors (an ORDELA He-3 MWPC 'main' detector and a annular 4-module 'high-angle' scintillator detector, neither of which move!). There are no jaw sets on LOQ.

LOQ will migrate from the SECI control system to the IBEX control system in time for Cycle 2018/04.

The equipment listed below is used on LOQ. Please add new information (e.g. new items of equipment, new notes, information about drivers, etc. as necessary).

For a minimally functional instrument:

Manufacturer	Model	Type	Connection	Driver	Notes
ISIS	DAE 2	Detector Electronics	Ethernet		see DAE note
ISIS	n/a	LiveView			see Live View note
ISIS	Mk3	Chopper	N/A		see Chopper note
GALIL	DMC2280	Motion Controller	Ethernet	[EPICS]	see Galil note
ORDELA	2661N	Ordela Detector			see Ordela Detector note
NI	???	Fieldpoint	Ethernet		see Ordela Detector note
Omega	iBTHX	Transmitter	Ethernet		see Omega note
Omega	PAC	Intelligent Controller	ModBus		see Omega PAC note
MOXA	ioLogik	Remote I/O Controller	Ethernet		see MOXA ioLogik note
ISIS	???	ISIS Vacuum System			see Vacuum System note
Pfeiffer	TPG300	Vacuum Gauge	RS-232	EPICS	see Vacuum System note
Eurotherm	Temperature Controller	All models at ISIS	RS-232	EPICS	see Eurotherm note
Julabo	FP-51	Water Bath	RS-232		see Water Bath note
ISIS	n/a	Julabo Valve			see Water Bath note
ISIS	LOQ	Sample Changer			see Sample Changer note
ISIS	LOQ	Sample Changer Scan			see Sample Changer Scan note

There is then a wide range of alternative sample environment used on a much less frequent basis, listed below in (approximate) decreasing order of importance:

Manufacturer	Model	Type	Connection	Driver	Notes
CNR-ISIS	n/a	DLS	RS232 & Ethernet		see DLS note - commissioning soon
Thar	ISIS	Pressure Cell			see Pressure Cell note
Danfysik	8000	PSU	RS232	DFKPS	see Danfysik note
Anton-Paar	Physica MCR-501	Rheometer			see Rheometer note
ISIS	RAL	V/Nb Furnace			see Furnace note
ISIS	RAL	Muon Optical Furnace			see Furnace note
ISIS		CCR			see Cryo note
ISIS		Orange Cryostat			see Cryo note
ISIS	LOQ	Couette Cell			see Couette Cell note
McLennan	PM600	Motion Controller	RS-232	EPICS	see McLennan note
Unilever		Extensional-Flow Cell
ISIS	LOQ	T-Jump Cell			see T-Jump Cell note
Keithley	2400	Source Meter	RS-232	#1826	see Keithley note
Biologic	???	Stop-Flow Cell
Thurlby	EX355P	PSU	???		see Thurlby note
Huber	SMC 9000	Motion Controller	Ethernet		see Huber note

Also see Ordela Detector note below.

1. LOQ has a SECI VI for visualising the data being acquired on the ORDELA detector in real-time. This is essential to efficient instrument operations and will need implementing in Ibex.
2. If it were possible to extend the functionality to include the high-angle detector that would be very welcome.

LOQ has an ISIS Mk3 chopper.

LOQ Galil drives 4 axes: Sample Changer _height _ stage, Sample Changer vertical stage, A2, and M3.

1. ORDELA (Oak Ridge Detector Laboratory) is a manufacturer of area-detector devices. It is a spin-off from Oak Ridge National Laboratory. Detector installed is a Model 2661N He-3 MWPC.
2. This detector is currently controlled (HV on/off, setting discriminator levels) by proprietary W95-era software running on a dedicated PC. The same PC also features a NI DAQ card which can be used to record data independently of the LOQ DAE. This facility is only ever used for detector diagnostics.
3. LOQ's reliance on an ageing PC/software combination to turn the detector on/off and set the discriminator levels is a significant single-point-of-failure which has been flagged for many years but only recently received any resource (ask DPK). As part of the Ibex migration this issue should be addressed.
4. The NI Fieldpoint device measures the detector voltage, the discriminator voltage and the detector temperature on three separate channels on separate modules (see VI). The plan is to replace this obsolete device with an NI cDAQ (model 9185?) with the appropriate modules as this is currently supported in IBEX.
5. The ORDELA detector can be damaged as a result of the neutron count rate being too high. Software is required to detect this over count rate (via the ISISICP) and move an aperture into a position to block the beam (axis controlled by Galil motion controller). Settings should be available to enter the over count rate level and the duration of the over count rate before any action is deemed necessary. The aperture has three discrete positions for normal operation. To block the beam it needs to be moved to the closest mid point of these positions. A message needs to be reported to a contact list and a corresponding message displayed on the instrument screen to identify a problem has been detected. (VI references : 1. C:\LabVIEW Modules\DAE\DAE Detector Check.vi 2. C:\LabVIEW Modules\Instruments\LOQ\LOQ Detector Protect\LOQ Detector Protect.llb\LOQ - Detector Protect - Front Panel.vi)

OMEGA™ iBTHX transmitter is a device to monitor and record barometric pressure, temperature, relative humidity, and dew point over an Ethernet network or the LOQnet. It is attached to the rear of the ORDELA detector.

The OMEGA™ iBTHX (see above) is not reliable. It has been decided to replace it with a OMEGA™ PAC Controller device to monitor and record temperature.

Both the OMEGA™ iBTHX and OMEGA™ PAC devices (see above) have proved unreliable. It has been decided to use MOXA ioLogik 12XX devices to monitor and record temperature & voltage on the ORDELA detector.

1. There are 2 vacuum gauges on LOQ. Both are TPG300's. One is atop the Galil at the sample position monitoring the collimation, and the other is integrated into the detector tank pumping system.
2. Only the detector tank TPG300 is currently read back in SECI. There are two sensors, one at the pump, and one on the tank.
3. It is highly desirable to have the collimation TPG300 integrated into Ibex too.
4. TPG300 support is implemented via #216 and #2063

Eurotherms are used to control the temperature of Orange Cryostats, CCRs and Furnace devices. And also to measure voltages from other sensors.

LOQ routinely uses 2 Julabo Water Baths. Both are Model FP-51's. In an emergency (ie, a bath failure) we would use Julabos from the ISIS inventory which include Model FP-50's and Model FP-52's.

The LOQ Julabo baths act in a pair, and depend on the external/internal status. If the baths are not behaving as you would expect, check whether internal and external have been flipped. We will check out of cycle if this could be caused by IBEX rebooting.

There is an electrically-operated solenoid valve to allow scripted control of which Julabo Water Bath is thermostating the Sample Changer. This is implemented in SECI and will need replicating in Ibex.
A similar device could also be used on SANS2D, so a driver for the Julabo Valve will be valuable elsewhere.

1. The LOQ Sample Changer is driven by a Galil. It sits on a Height Stage which is also driven by a Galil. This combination accounts for >90% of sample environment usage on LOQ.
2. In SECI the Sample Changer can be driven 'manually' from a VI, or 'autonomously' from GCL scripts.
3. Sample Changer scripts are created by a VB application called LOQscript developed by MJC. An Ibex-compatible equivalent of LOQscript will need to be provided.

1. A VI called LOQ SC Scan allows the sample positions on the Sample Changer to be 'scanned in' using the LOQ alignment laser and the output recorded on a photocell. It was written by GDH.
2. The photocell is connected to a Thor Labs Model PM100A power meter.

1. This apparatus should be ready to commence commissioning in Autumn 2018. Commissioning will take place on LOQ but the apparatus is intended to be available on LOQ, SANS2D, LARMOR and ZOOM.
2. The apparatus contains a 100 mW Coherent OBIS visible laser with the facility for remote control.
3. The scattered laser light will be processed by an LS Instruments multi-channel, multi-tau, correlator.
4. For further information see ticket #3361.

The Thar Pressure Cell normally just integrates with the Eurotherm controller.

1. : Currently a Danfysik Model 8000 controller is integrated into an ageing GEC power supply, but the GEC unit is due to be replaced in the near future as part of ISIS-wide obsolescence. It will most likely be replaced by a Danfysik power supply. Richard Hale may be able to advise what model.
   1. There is a possibility that the GEC power supply will be replaced prior to December 2018. The replacement power supply will be a Danfysik 8500 Model 859.
2. Danfysik Power Supplies
3. User and Software Manuals for System 8500.
4. See #1208 for comms settings.

1. This device is controlled by proprietary software (on a dedicated PC). Manufacturer is reluctant to allow it to be integrated with ISIS software (i.e. SECI or IBEX).
2. We have in the past used a Eurotherm controller to send a trigger pulse to initiate actions by the proprietary software.
3. Manuals describing the use of the Anton-Paar Physica MCR-501 Rheometer are located here: \\isis\shares\ISIS_Experiment_Controls\AntonPaar_Physica_MCR501.

Furnaces normally just integrate with the Eurotherm controller.

1. CCR's and Cryostats normally just integrate with the Eurotherm controller.
2. LOQ does not use Cryomagnets. Ever!

1. The Couette Cell is driven by a McLennan PM1000 (compatible with a PM600).
2. See also #3105

Support for McLennan devices is well established (see #1099 and #1100 and subsequent tickets.

1. The T-Jump Cell is driven by a Keithley 2400.
2. See also #3175

1. Keithley 2400 Source Meter
2. See also #1826, #3176

1. Thurlby EX355P PSU - see #155 and #198.
2. Thurlby Thandar Instruments EX355P PSU

1. Huber.
2. According to Huber's web-site, a Huber SMC9000 is a motion controller. See SMC 9300 which appears to be the latest of the 9000-series and SMC 9000
3. The Huber device has not been used on LOQ for some time:
   I believe this device was a one-off use by a former member of the instrument team. SMK.
   It should not be considered a priority for support on LOQ. See also #3502

LOQ has the following specialist panels:

LOQ has the following devices under motion control:

1. Aperture (A2)
   • The aperture device is a plate with 3 different sized aperture holes. The Galil drives the plate to one of 3 predefined positions (each corresponding to one of the aperture holes). It would be useful to create a 4th position, corresponding to a solid portion of the aperture plate (so that it can be used to block the beam).
2. Sample Changer (translation & vertical)
   • The sample changer moves in a grid fashion - left/right translation across the beam and up/down vertical translation. Sample changer positions can be set directly in mm, or via preset positions (defined in a file, which is edited regularly). The preset positions use several naming conventions, according to the type of sample rack in use.
3. Transmission Monitor (M3)
   • moves in/out of the beam.

Document information about LOQ SECI configs here.

Configuration Name	Sub-Configurations	Last Accessed	Required
LOQ_NORMAL_25Hz_Cryostat.conf	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_DurhamRack	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_Flowcell.conf	-	dd/mm/yyyy	see note 1
LOQ_NORMAL_25Hz_Furnace.conf	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_Huber_stages.conf	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_Magnet.conf	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_PressuceCell.conf	-	dd/mm/yyyy	N
LOQ_NORMAL_25Hz_PressureCell.conf	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_Rheometer.conf	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_SampleChanger.conf	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_SampleChanger_eurotherm_controller.conf	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_SampleChanger_eurotherm_controller_2.conf	-	dd/mm/yyyy	?
LOQ_NORMAL_25Hz_SampleChanger_NOLIVEVIEW.conf	-	dd/mm/yyyy	see note 2
LOQ_NORMAL_25Hz_Shear.conf	-	dd/mm/yyyy	see note 1
LOQ_NORMAL_25Hz_StopFlow.conf	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_TJump.conf	-	dd/mm/yyyy	Y
LOQ_NORMAL_25Hz_UnileverCell.conf	-	dd/mm/yyyy	Y
LOQ_QUIET.conf	-	dd/mm/yyyy	see note 3

Need to establish what devices these relate to!

This is LOQ_NORMAL_25Hz_SampleChanger.conf without the second time regime. Occasionally used with non-standard detector mapping.

Configures LOQ for running on internal clock.

Similarly, Document information about LOQ SECI Genie scripts here.