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Shifter training is mandatory!

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Academic year: 2021

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(1)

Beamline Status

Henry Nebrensky

Brunel University

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Target

Installed S-series into ISIS in Dec. 2014:

- 4.3M successful pulses; expect 5M+

- Stable running at 30 deg.C

- Allowed to take 2V loss at 64/50 Hz - Regular beam-bump tuning sessions

- Concern about continuing losses in readout fibres - Concern about continuing losses in readout fibres

- Loopback monitoring restarted

- Restart target run-in activity (R78)

- Changed gains in HW and swapped fibres - stabilised Overnight “standby” regime implemented with shifters

stopping and waking target

Shifter training is mandatory!

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Decay Solenoid

- DS Compressor maintenance in August, include an early annual service to carry through to end StepIV, went awry; after restart suffered mysterious drops in Helium level traced to a faulty level meter.

- DS Power Supply returned during the spring running, and the DS used in running since.

- Improved alarm limits have reduced false alarms - Improved alarm limits have reduced false alarms - Overnight “standby” regime in place

- Occasional instability seen in fridge in Dec. (no ALH most of that run)

- Gas cleaned over Christmas, but fridge tripped off by compressed air failure mid-January, turbines were

reluctant to restart.

Not something to repeat!

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PA / BS / Diffuser

- PA had the 29 mm slab not correctly reading out as being raised. Not reproducible during shutdown. I’ve changed a couple of limit switches and improved their alignment. Readout issues believed to have been a dodgy electrical connection.

Then yesterday all the readout seemed to have stopped working... I hope this is a C&M issue.

working... I hope this is a C&M issue.

- BS sprang a leak in one of the circuits causing it to droop open – fixed during annual service.

- Diffuser had damaged electronics in controller repaired.

Towards the end of the last run iris 4 ceased to open fully. Not seen this problem since (without field), and been unable to repeat with field without SSU.

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Conventional Magnets - 1

Currents now set via Run Control and overnight

“standby” regime agreed

Earth-leakage measurements are being made; show ...something. Predominantly a dependence on water resistivity.

Calibrations of the dipole and DS read-back currents Calibrations of the dipole and DS read-back currents

checked and corrected as needed.

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Conventional Magnets - 2

- Known issue with limited cooling water

- Trench water system working – gets the heat from the magnets into the roof water (“process water”)

- Replacement “Manager” now steps up cooling power through both chillers on roof; and also reports

problems on the display outside the MLCR

Have managed to dissipate an extra 195kW from the

- Have managed to dissipate an extra 195kW from the magnets without worrying the cryo-compressors –

compared with barely managing 70kW last cycle (when we were down a chiller but couldn’t tell).

- Have now lost chiller 1 twice: “safe” running still depends on alert shifter response to working alarms.

- Moving conventional magnets to loading-bay chiller

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BLOC roster

Showstopper for March running is lack of trained

BLOCs and very few volunteers. Piggyback training on early March run.

STILL

remains a potential showstopper – nearly had to cancel several shifts already.

Economic pressure is to take shifts, not BLOC. We now allow BLOCs to take the day shift – with the rider that allow BLOCs to take the day shift – with the rider that

if they are called out overnight they can skip next day’s shift

.

With 16/7 running, the only scheduled BLOC interventions are associated with the Wednesday maintenance

period...

...the rest of the time it is “on-call”

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Future work:

Short Term:

- Reinstate R78 target activity

- Extended list in MICEmine #1892 Longer Term:

- Chilled water – transfer heat load to chiller - Chilled water – transfer heat load to chiller

in loading bay?

- Loss of Target System expertise

- Maintaining BLOC expertise

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