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Beamline Status

Update since February 2015

Henry Nebrensky

Henry Nebrensky – MICE CM43 – 29 October 2015

Henry Nebrensky

Brunel University

1

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Target

[summary, see Joe’s talk...!]

Installed S-series into ISIS last December:

- 1M successful pulses

- Stable running at 30 deg.C

- Allowed to take 2V loss at 64/50 Hz

- Longstanding concern about losses in readout fibres - Longstanding concern about losses in readout fibres

-

Fibres now fully enclosed and soak tested

-

Many fibre ends have new connector spliced on Spare target mechanisms to be prepared

- New batch of target shafts en route

New S4 stator next year

(3)

Conventional Magnets

Running fine; currents set via Run Control

- Known issue with limited cooling water flow

-

downstream quads restricted to 315A - Q4 MPS regulator board board replaced

stable at current but needs tuning

Henry Nebrensky – MICE CM43 – 29 October 2015

-

stable at current but needs tuning - Q8 water leak fixed

- Q789 exposed conductors now covered over - Q9 Magnet-On lamp repaired

-

fault found in the wiring

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Decay Solenoid

Compressor and main fridge serviced separately last February and March.

- Control valve actuator (in DSA) failed in spring

-

replaced; awaiting spare for stock

- QD battery back-up unit not recharging interaction with new PSU needs fixing

-

interaction with new PSU needs fixing - DS Magnet-On lamp warning

- Lost remote control over current (Sept.)

-

faulty voltage isolator identified and replaced - “Over-temperature” PSU trips

-

PSU left overnight (19h) at 870 A last autumn;

data taken OK in June at 668 A

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PA / BS

Proton Absorbers:

Flow restrictor valves added to air lines

This has smoothed out the slamming on the

downward movements and should prevent the limit switches getting battered

Henry Nebrensky – MICE CM43 – 29 October 2015

Beamstop:

Pressure hose replaced in second circuit; now have a failover system working again

Both of these required the DSA open: need to

synchronise expert availability with opportunity

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MLCR and CAM

Eventually managed to get the existing Alarm Handler settings usable (with aid of a Post-It note)

Alarm Handler / Archiver Spreadsheets are in progress – drafts of “Beamline” and “Decay Solenoid” exist.

Solenoid” exist.

I need to get the Target spreadsheet done and need

to improve Archiver handling (e.g. I forgot to ask

for the detailed Beamloss archiver to be active for

the Activation Run).

(7)

Safety and Beamline Preparation

We have got permission to streamline the beamline start-up by keeping the conventional magnet

supplies continuously powered in remote mode.

Overt assumption that the magnets are only driven from the MLCR, whence people know what is

going on in the Hall!

Henry Nebrensky – MICE CM43 – 29 October 2015

going on in the Hall!

Local enforcement using the emergency stops

We are also in negotiation to leave out the beamstop mechanical restraint between shifts (“stand-by”)

Reduce need for on-site BLOC cover and Controlled Entries

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Future work:

- Diagnosis of the DS PSU overheating (DL) - Q4 control check? (DL)

- Cleanup of R78 target controls (DL) - Polarity sensor radiation damage test January (maintenance month):

- Trace through all the target fibres from synch and - Trace through all the target fibres from synch and

confirm mapping and labelling

- Servicing of DS Compressor and Linde Fridge - Linde Control PC upgrade (?)

- Beamstop hydraulics annual service

- Possible installation of pressure transducer to monitor

high pressure/purity compressed air state from outside

MICE Hall

Références

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