GEM

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

Background & Timeline

GEM is a diffractometer instrument at ISIS, on TS1. The GEM web page describes the background to the instrument.

Control System

GEM will migrate from the SECI control system to the IBEX control system in summer 2017. During the summer 2017 shutdown, new jaws will be installed on GEM.

GEM Equipment

The equipment listed below is used on GEM. Please add new information (e.g. new items of equipment, new notes, information about drivers, etc. to this table).

Manufacturer

Model

Type

Connection

Driver

Notes

ISIS

DAE 2

Detector Electronics

Ethernet

see DAE note

ISIS

Mk2 Chopper

Chopper

RS-232

see #2130

see Chopper note

GALIL

DMC2280

Motion Controller

Ethernet

EPICS

???

5 x 4-blade jaws

see Jaws note

???

1 x 4-blade jaws

“Beamscraper” Jaws see Jaws note

ISIS

Collimator

Oscillating Radial

see Collimator note

ISIS

???

ISIS Vacuum System

see Vacuum System note

Eurotherm

Temperature Controller

All models at ISIS

RS-232

EPICS

see Eurotherm note

Oxford Instruments

Orange Cryostat

Cryogenic System

see Oxford Instruments note

Oxford Instruments

Blue Cryostat

Cryogenic System

see Oxford Instruments note

Oxford Instruments

Dilution Fridge (Kelvinox)

Cryogenic System

see Oxford Instruments note

Closed Cycle Refrigerator

see CCR note

ISIS

GEM-Furnace

Furnace

see ISIS Furnaces note

McLennan

PM600

Motion Controller

RS-232

EPICS

see McLennan note

ISIS

GEM Sample Changer

Sample Changer

RS-232

Same as POLARIS sample changer. See #2173

MKS

PDR2000

Pressure Transducer

RS-232

see #1406 and #1620

Pfeiffer

TPG300

Vacuum Gauge

RS-232

EPICS

see #216 and #2063

From time-to-time, GEM has also used magnets, gas handling and high-pressure systems, but not frequently.

Note: DAE

Main Detector banks + fixed monitors.

Note: Choppers

3 choppers: 2 double-disk and one T0 chopper.
Choppers are ISIS Mk2 choppers. Mk2 choppers have a serial interface (not Ethernet like Mk3).

Note: Oscillating Radial Collimator

The oscillating radial collimator is currently driven by a McLennan system, controlled via a custom controller at present. At some point this controller is going to be replaced by a Galil system, but this will not be done by September 2017.

There have been instances where the collimator stops responding (see: https://github.com/ISISComputingGroup/IBEX/issues/3167). These cases present as the device responding to status requests, but not acting on requests to reinitialise or start the oscillator. In this case, the device has to be power-cycled. To do this, it must first be switched off via the front panel, then the power cable must be removed. Leave the device for several seconds before reconnecting and switching back on. If successful, the number of cycles should reset to zero.

Note: Jaws

GEM has 5 four-blade jaws and one bespoke set of jaws (called the “beam-scraper”).
For the “beam-scraper” jaws - see #2138
The 5 four-blade jaws were due to be replaced with Galil driven units during summer 2017. However, as of May 2017, the upgrade has been postponed:
From Ivan da Silva: Finally, due to other instrument works’ priorities, the GEM works for replacing the jaws will not be carried out during the next summer shutdown, but during winter 2017/2018. Then, for 2017/02 cycle we will be still using the same jaws sets as for now. In principle, we will start using the new jaws on cycle 2017/04 (Feb-Apr 2018).
Therefore, all jaws on GEM will continue to be controlled by LinMot controllers until, at least, cycle 2017/04. Confirmed by Nick Webb (04-07-2017): new GEM jaws, controlled by Galil, will be installed in November 2017.

Note: Vacuum System

GEM does not need to control the vacuum system, but it does need to be able to view and log vacuum gauge readings.

Note: Eurotherm

Used to control temperature Orange Cryostat, CCR and Furnace devices.

Note: Oxford Instruments

  1. Orange Cryostat: models to be determined. Orange cryostats are controlled via a temperature controller (e.g. Eurotherm), so nothing on the cryostat itself for IBEX to control.

  2. Blue Cryostat: models to be determined.

    1. Are these the Heliox and ITC devices?

    2. The Heliox device has a sorption insert (is that relevant to the control system?)

  3. Dilution fridge: models to be determined.

    1. Kelvinox dilution fridge

Note: Closed Cycle Refrigerators

CCRs. Not directly computer-controlled - controlled via Eurotherm.

Note: ISIS Furnaces

More information on IRIS Furnaces. GEM uses:

  1. GEM Furnace

  2. RAL 4 Furnace

  3. Low temperature furnace

Furnaces are controlled via a temperature controller (e.g. Eurotherm), so nothing on the furnace itself for IBEX to control.

Note: McLennan

see Collimator note

GEM SECI Configs

Document information about GEM SECI configs here.

Configuration Name

Sub-Configurations

Last Accessed

Required

gem_heliox.conf

-

14/11/2016

-

gem_sample_changer_matt.conf

Choppers

20/05/2016

-

gem_ccr_matt.conf

Choppers

28/04/2016

-

gem_sample_changer_Alex.conf

Choppers

24/02/2016

-

gem_lowT_furnace_matt.conf

Choppers

04/12/2015

-

gem_kelvinox_matt.conf

-

01/10/2015

-

GEM_CRYOSTAT.conf

Choppers

24/07/2015

-

gem_furnace_matt.conf

Choppers, Furnace Pressure

15/06/2015

-

gem_polaris_sample_changer_matt.conf

Choppers

26/04/2015

-

gem_furnace_ramp.conf

Furnace Pressure

03/04/2015

-

gem_furnace.conf

Furnace Pressure

02/04/2015

-

gem_3eurotherms.conf

-

20/03/2015

-

gem_sample_changer.conf

Choppers

18/03/2015

-

GEM_CRYOSTAT_matt.conf

-

02/06/2014

-

gem_ccr.conf

Choppers

02/04/2014

-

gem_8t cryo.conf

GEM_Base, Choppers

18/12/2013

-

5 Axis.conf

-

20/07/2013

-

gem_sample_changer_+_3_Eurotherms.conf

3_Eurotherms

18/03/2013

-

gem_tizrcell_matt.conf

-

16/10/2012

-

gem_3eurotherms_pressure.conf

-

12/10/2012

-

gem_ambient.conf

-

04/10/2011

-

gem_3eurotherms_baritron.conf

-

16/04/2011

-

gem_express.conf

-

23/02/2011

-

gem_gazcell.conf

-

16/02/2011

-

gem_cryo + eurotherm.conf

-

15/02/2011

-

gem_7t cryomagnet.conf

-

15/02/2011

-

Dave.conf

-

15/02/2011

-

gem_kelvinox.conf

-

27/01/2011

-

gem_cryo + ilm.conf

-

27/01/2011

-

gem_cryo + ilm + SC.conf

-

27/01/2011

-

gem_cryo + heliox.conf

-

27/01/2011

-

gem_8t cryo + rotation.conf

-

27/01/2011

-

gem_8t cryo + kelvinox.conf

-

27/01/2011

-

gem_10t cryomagnet.conf

-

27/01/2011

-

GEM Genie Scripts

Similarly, Document information about GEM SECI Genie scripts here.

GEM Notes

Add any notes about special items of equipment, setup or conditions on GEM that might impact the deployment and configuration of IBEX.