Beam status
MCR News
14 October 2026 02:34
Beam ON
14 October 2026 02:07
A power supply has gone faulty in one of the linac modulators. Crew are
just in the process of changing it. Update at 02:45.
12 October 2026 05:31
Beam ON
12 October 2026 05:24
We are experiencing an issue with one of the TS1 RGA's and we are in
contact with the on-call equipment expert regarding this.
Update @ 06:00.
09 October 2026 23:10
Beam ON
09 October 2026 22:46
The Linac modulator is back on but we are having issues controlling the
tank phase. Beam is expected to be intermittent whilst experts investigate
the cause of this.
09 October 2026 21:33
BEAM OFF - Equipment experts are working on a fault with one of the Linac
modulators. The issue is expected to be fixed shortly.
09 October 2026 17:29
Beam on.
09 October 2026 16:45
The Ion Source has been fitted and is running. Machine Physicists are in
attendance setting up the Injector. Update at 17:30
09 October 2026 14:34
The outcome of the investigation is that the ion source will need to be
replaced. This is expected to take approximately 3 hours.
09 October 2026 14:28
We are currently experiencing an issue with the ion source. An expert is
investigating the issue, and a further update will be provided shortly.
09 October 2026 09:26
Intermittent beam whilst we address issues with Injector Intensity trips.
09 October 2026 09:18
Beam on to both Target Stations.
09 October 2026 08:30
The Ion source has been run up. Once the Injector has been run up we will
need some time for machine set up. Update at 09:15.
09 October 2026 07:42
The Ion source has been replaced and one of our Ion source specialists is
currently running it up. If all goes well we will need some time for
machine set up. Update on progress at 08:30 Hours.
09 October 2026 05:59
The ion source will be replaced. An update will be provided at 7:30 AM.
09 October 2026 05:53
We are currently experiencing an issue with the ion source, which is under
investigation by a specialist. I will update shortly of the result
08 October 2026 23:26
Issues resolved, Beam back on at 23:00
08 October 2026 22:51
Machine update:-
We are suffering with high injection losses. Machine specialists are
investigating. Update at midnight.
08 October 2026 08:38
Our equipment specialist is still diagnosing the fault with TS1 RGA's.
Update at 09:30 Hours.
08 October 2026 07:49
We are waiting for an update from our equipment specialist about the comms
issues with Target Station 1 RGA. Both RGA's are currently holding us off
with machine interlocks. Beam will continue running to TS2 whilst
investigations continue. Update at 08:30 Hours.
08 October 2026 06:51
There is an issue with one of the Target 1 systems. Expert on route to
investigate. Beam has been switched to Target 2 only running for now.
Update @ 07:45
07 October 2026 14:31
We are experiencing controls issues that may affect beam line instruments.
Controls experts are working on the system and estimate that this will be
resolved by 15:00hrs.
07 October 2026 08:55
User Coffee and Cake: 3:00pm today, TS2 Foyer. All welcome!
06 October 2026 15:03
Beam Off - We are experiencing an issue with water flow in the Linac.
Equipment experts are investigating the cause of this. We are hoping this
issue will be resolved quickly and beam should be back on shortly.
04 October 2026 17:55
Machine update:-
Beam restored to both target stations at 17:35hrs.
04 October 2026 17:14
Machine update:-
We have a problem with the Extract Septum magnet continually tripping on
over temperature. We have consulted with experts and they are on route to
assist with repairs. Next update 18:00hrs.
04 October 2026 04:11
We have resolved the waterflow issue. We now have an issue with one of the
kicker power supplies. Update at 05:30.
04 October 2026 03:17
We are currently experiencing a water flow issue on the extract septum
magnet circuit. Investigations are underway. Update at 04:00 hrs
02 October 2026 15:33
BEAM ON to both targets
02 October 2026 15:04
Machine update:-
Machine reconfigured to run to TS2 only while the issue with Intermediate
target is addressed.
02 October 2026 14:24
Machine update:-
BEAM OFF - We currently have an interlock issue on the Intermediate target
- Experts investigating - Update at 15:00
02 October 2026 07:58
Machine update:-
Beam back on to both target stations.
02 October 2026 07:56
MAchine update:-
Unfortunately we had a problem with the charge change on Target 2, which
held ISIS off with machine interlocks. Beam was re-established to Target 1
whilst repairs were made. The fault has now been rectified, and we will be
converting back to beam to both Targets momentarily.
02 October 2026 07:07
We are now investigating a problem with Target 2 interlocks. Update at
07:30.
02 October 2026 06:24
Our Physicists are still working on the machine setup issues. Update at
07:15 Hours.
02 October 2026 05:18
We are still having set up problems. One of our Machine Physicists is
working on injector setup. Update at 06:00 Hours.
02 October 2026 04:49
All equipment is operational. We are having a few issues with machine
setup. Update at 05:30 Hours.
02 October 2026 03:40
The Ion source is running. We are in the process of locking up and running
up the Injector. Once we confirm the Ion source output is good we will do
some machine setup before restoring beam. Update at 04:30 Hours.
02 October 2026 01:56
The Ion source has been removed and there was a partial blockage which has
been cleaned. We now have an issue with vacuum and are waiting for a
specialist to arrive. Once this is resolved the Source can be refitted and
run up. Update when we have more information.
02 October 2026 00:08
We have a problem with the Ion Source which appears to have a partial
blockage. An equipment specialist is coming in to assist with removal and
cleaning (or replacement). This normally takes around 3 Hours. Update at
04:00 Hours.
30 September 2026 14:26
MS beam restored to both target stations.
30 September 2026 08:30
Beam off for the start of maintenance day.
26 September 2026 23:22
Beam back on @23:00 slightly lower than before Ion Source issue. Tuning
will continue.
26 September 2026 22:44
Setup is progressing slowly. Having slight diags issue while setting up.
Update @23:30
26 September 2026 21:12
Ion source is now up and running well. Currently working on the setup of
the machine.
Update @22:30
26 September 2026 18:49
The equipment expert found a small blockage in the ion source and decided
it was best to replace it for a new one. The replacement ion source is now
being run up. Once this is done machine set up operations can begin.
Update @ 21:00.
26 September 2026 17:03
The equipment expert has fixed the issue with the ion source hydrogen flow
and the ion source was run up again. However, the output was too low. The
equipment expert is now removing the ion source to inspect it for a
blockage. If one is found they will attempt to remove the blockage and run
the ion source up again. If no blockage is found the ion source will be
replaced.
Update @ 19:00.
26 September 2026 15:03
The issues with the ion source are ongoing. Equipment experts are on site
and investigating the cause of the hydrogen failure.
Update @ 17:00.
26 September 2026 14:01
We are experiencing an issue with the ion source hydrogen flow and we are
in contact with equipment experts.
Update @ 15:00.
26 September 2026 13:02
The LEBT beamstop bellows have been replaced, the ion source has been
re-inserted and we are currently in the process of running it up. Once
this is done we will need to perform beam set up operations.
Update @ 14:00.
26 September 2026 10:09
Vacuum experts have confirmed that the LEBT beam stop bellows has failed.
Mechanical experts are on site and will now perform a bellows replacement.
To do this the ion source will need to be removed and then replaced once
the work is completed.
Update @ 13:00.
26 September 2026 08:57
We are experiencing an issue with the LEBT beam stop vacuum. An expert is
on route to site to investigate further.
Update @ 10:00.
ISIS operating schedule
Our upcoming operating schedule. Cycles begin/end at 08:30 on the date specified
| Cycle | Start | End | Target station(s) | Maintenance day(s) | Comments |
| 2026/3 | 15 Sep 2026 | 23 Oct 2026 | TS1 & TS2 | 30 Sep 2026 | — |
| 2026/4 | 17 Nov 2026 | 18 Dec 2026 | TS1 & TS2 | 02 Dec 2026 | — |
| 2026/5 | 02 Feb 2027 | 25 Mar 2026 | TS1 & TS2 | 17 Feb & 10 Mar 2027 | — |
| LONG SHUTDOWN | |||||
| 2027/1 | 16 Nov 2027 | 17 Dec 2027 | TS1 & TS2 | 1 Dec 2027 | — |
| 2027/2 | 22 Feb 2028 | 31 Mar 2028 | TS1 & TS2 | 8 Mar 2028 | — |
ISIS operating schedule - future years
We plan to have an extended shutdown for accelerator and beamline work from March to October 2027. The next proposal access call will open in March 2027 to allocate time from November 2027 to March 2028.
Machine physics schedule
Accelerator physics experiments are performed before and after each user run. Expand this section to see the latest schedule.
| Date | Shift | Mode | Rep Rate | Task | Contacts | Notes |
| 31/8/26
Monday |
00:00–08:30 | 4B | MS/32 | |||
| 08:30–16:30 | 4B | MS.32 | Initial Injector Setup
IPM1-3 commissioning |
BK, SK | ||
| 16:30–00:00 | 4B | MS/32 | Initial Injector Setup
IPM1-3 commissioning |
HVC | Injector and HEDS quad setup | |
| 1/9/26
Tuesday |
00:00–08:30 | 4B | MS/32 | |||
| 08:30–16:30 | 4B | MS/32 | Initial Synchrotron Setup | REW, EA | Injector and HEDS quad setup | |
| 16:30–00:00 | 4B | MS | Initial Synchrotron Setup | DJA | ||
| 2/9/26
Wednesday |
00:00–08:30 | 4B | MS | |||
| 08:30–14:00 | 4B | MS | Synchrotron Setup
EPB2 Alignment |
HVC, CJ | ||
| 14:00-16:30 | 4B | MS | RF Setup | AS | ||
| 16:30–00:00 | 4B | MS | Synchrotron Setup | REW, HR | ||
| 3/9/26
Thursday |
00:00–08:30 | 4B | MS | |||
| 08:30–14:00 | 5 | MS, MS2/8 | Synchrotron Setup
EPB1 Alignment BPM Acceptance Tests |
HVC, SK, KF | HEDS Chopper Required | |
| 14:00-16:30 | 5 | MS, MS2/8 | SP6 Bump Tests | SK | HEDS Chopper Required | |
| 16:30–00:00 | 5 | MS | Synchrotron Setup | CMW, EA | ||
| 4/9/26
Friday |
00:00–08:30 | 5 | MS | |||
| 08:30–16:30 | 5 | MS | Linac FFDD->FODO studies | SA, REW | ||
| 16:30-18:30 | 5 | MS | RF Setup | AS | ||
| 18:30–00:00 | 5 | MS | Synchrotron Setup | HVC, JBL | Final focus investigations | |
| 5/9/26
Saturday |
00:00–08:30 | 5 | MS | |||
| 08:30–16:30 | 5 | MS/32 | RFQ LLRF Control Tests | AS | ||
| 16:30–00:00 | 5 | MS/32 | High Intensity Running | DJA | ||
| 6/9/26
Sunday |
00:00–08:30 | 5 | MS/32 | |||
| 08:30–16:30 | 5 | MS/32 | Half-integer resonance studies | CMW, HVC | SRM, HEDS Chopper Required | |
| 16:30-20:30 | 5 | MS/32 | Tune Scan | EA, HVC | SRM | |
| 20:30–00:00 | 5 | MS/32 | Schottky measurements | CJ | SRM, HEDS Chopper Required | |
| 7/9/26
Monday |
00:00–08:30 | 5 | MS/32 | (run on if required) | CJ | SRM, HEDS Chopper Required |
| 08:30–16:30 | 5 | MS/32 | Space charge studies | REW, FS | BSRM | |
| 16:30–00:00 | 5 | MS/32 | AC Dipole operation for resonant driving term | CJ | BSRM | |
| 8/9/26
Tuesday |
00:00–08:30 | 5 | MS/32 | |||
| 08:30–14:00 | 5 | MS | Synchrotron Setup
HEDS Chopper Synchronisation Tests |
HVC, OC, DK | HEDS Chopper Required | |
| 14:00-16:30 | 5 | MS | TS2 Halo Checks | AB, RG, Crew | ||
| 16:30–00:00 | 5 | MS | Synchrotron Setup | CMW, HR | ||
| 9/9/26
Wednesday |
00:00–08:30 | 5 | ||||
| 08:30–16:30 | 5 | MS | Diagnostics Testing (EPB1 BLM Head Amps, EPB Intensity Monitors, EPB2 MUXs, R0IM testing) | JFG (HVC) | ||
| 16:30–00:00 | 5 | MS | Synchrotron Setup | REW, SK | ||
| 10/9/26
Thursday |
00:00–08:30 | 5 | MS | |||
| 08:30–14:00 | 5 | MS | Synchrotron Setup
EPB steering magnet criticality checks |
HVC, HR, SG | +TC105 investigations with SG if possible | |
| 14:00-16:30 | 5 | MS | LEBT Optimisation & Phasensonde Training Data | REW, RB, IF | ||
| 16:30–00:00 | 5 | MS | Synchrotron Setup | DJA | ||
| 11/9/26
Friday |
00:00–08:30 | 5 | MS | |||
| 08:30–18:30 | 5 | MS | Synchrotron Setup | REW, EA | ||
| 18:30–00:00 | 5 | MS | Synchrotron Setup | HVC | ||
| 12/9/26
Saturday |
00:00–08:30 | 5 | MS | |||
| 08:30–16:30 | 5 | MS | Synchrotron Setup | EA, SK | ||
| 16:30–00:00 | 5 | MS | High Intensity Running | DJA | ||
| 13/9/26
Sunday |
00:00–08:30 | 5 | MS | |||
| 08:30–16:30 | 5 | MS | High Intensity Running | HVC | ||
| 16:30–00:00 | 5 | MS | Radiation Surveys | HP Section |
Previous cycles
Select to see prevous ISIS cycle dates
| Cycle | Start | End | Target station(s) | Maintenance day(s) | Comments |
|---|---|---|---|---|---|
| 2026/2 | — | — | — | — | Cycle cancelled |
| 2026/1 | 05 May 2026 | 12 Jun 2026 | TS1 & TS2 | 20 May 2026 | |
| 2025/5 | 17 Feb 2026 | 30 Mar 2026 | TS1 & TS2 | 4 Mar 2026 | |
| 2025/4 | 18 Nov 2025 | 19 Dec 2025 | TS1 & TS2 | 03 Dec 2025 | |
| 2025/3 | 09 Sep 2025 | 17 Oct 2025 | TS1 & TS2 | 24 Sep 2025 | |
| 2025/2 | Cycle cancelled | ||||
| 2025/1 | 29 Apr 2025 | 06 Jun 2025 | TS1 & TS2 | 14 May 2025 | |
| 2024/5 | 18 Feb 2025 | 28 Mar 2025 | TS1 & TS2 | 05 Mar 2024 | |
| 2024/4 | 19 Nov 2024 | 20 Dec 2024 | TS1 & TS2 | 04 Dec 2024 | |
| 2024/3 | 17 Sep 2024 | 20 Dec 2024 | TS1 & TS2 | 04 Dec 2024 | |
| 2024/2 | 09 Jul 2024 | 09 Aug 2024 | TS1 & TS2 | 05 Mar 2024 | |
| 2024/1 | 23 Apr 2024 | 31 May 2024 | TS1 & TS2 | 08 May 2024 | |
| 2023/5 | 13 Feb 2024 | 22 Mar 2024 | TS1 & TS2 | 28 Feb 2024 | |
| 2023/4 | 14 Nov 2023 | 19 Dec 2023 | TS1 & TS2 | 29 Nov 2023 | |
| 2023/3 | 19 Sep 2023 | 20 Oct 2023 | TS1 & TS2 | 04 Oct 2023 | |
| 2023/2 | 27 Jun 2023 | 04 Aug 2023 | TS1 & TS2 | 12 Jul 2023 | |
| 2023/1 | 25 Apr 2023 | 26 May 2023 | TS2 Only (TS1 Commissioning) |
10 May 2023 |