LOQ

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

Background & Timeline

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.

Control System

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

LOQ Equipment

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

Note: DAE

Also see Ordela Detector note below.

Note: Live View

  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.

Note: Choppers

LOQ has an ISIS Mk3 chopper.

Note: Galil

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

Note: Ordela Detector

  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)

~Note: Omega~

~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.~

~Note: Omega PAC~

~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.~

Note: MOXA ioLogik

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.

Note: Vacuum System

  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

Note: Eurotherm

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

Note: Water Baths

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.

Note: Julabo Valve

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.

Note: Sample Changer

  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.

Note: Sample Changer Scan

  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.

Note: Dynamic Light Scattering

  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.

Note: Pressure Cell

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

Note: Danfysik

  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.

Note: Rheometer

  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.

Note: Furnaces

Furnaces normally just integrate with the Eurotherm controller.

Note: CCRs and Cryostats

  1. CCR’s and Cryostats normally just integrate with the Eurotherm controller.

  2. LOQ does not use Cryomagnets. Ever!

Note: Couette Cell

  1. The Couette Cell is driven by a McLennan PM1000 (compatible with a PM600).

  2. See also #3105

Note: McLennan

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

Note: T-Jump Cell

  1. The T-Jump Cell is driven by a Keithley 2400.

  2. See also #3175

Note: Keithley

  1. Keithley 2400 Source Meter

  2. See also #1826, #3176

Note: Thurlby

  1. Thurlby EX355P PSU - see #155 and #198.

  2. Thurlby Thandar Instruments EX355P PSU

Note: Huber

  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 Notes

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.

LOQ SECI Configs

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

Note: 1

Need to establish what devices these relate to!

Note: 2

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

Note: 3

Configures LOQ for running on internal clock.

LOQ Genie Scripts

Similarly, Document information about LOQ SECI Genie scripts here.