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06 February 2023

Accelerator

DTL RF conditioning

RF conditioning of Drift Tube Linacs 2-4 is in progress in the normal conducting linac. RF power is supplied by the klystrons in the normal conducting gallery at slowly increasing capacity. The goal is to meet the final nominal power level of 14 Hz, 3.2 ms.

The operations are supervised from the ESS main control room.

The RF conditioning is a crucial step in making the normal conducting linac ready for Beam Commissioning later this spring.

RF power sources

With the modulator for cell 190B moved to its permanent place, all nine modulators powering the medium beta gallery are now in position in RF cells 150-190. All RF racks in the medium beta section has been energised, and power tests are ongoing in both the spoke and medium beta gallery.

Rack installations are ongoing in the high beta section.

Cryomodule Test Stand

A cleanroom is in place to perform repairs of medium beta cryomodule CM02, on which a vacuum leak was detected across the ceramic window of a coupler. The damaged part will be carefully exchanged, under supervision by the French in-kind supplier, CEA.

DTL workshop

Drift Tube Linac 5, the last part of the DTL section which is to be installed in the tunnel after the upcoming beam commissioning up to DTL4 has been completed, is under preparation in the DTL workshop. Module assembly is under way, and drift tube installations are performed inside a cleanroom confinement.

Target

Monolith inner shielding

This week, the Reflector base shielding block was successfully re-installed into the Monolith vessel. After defects were detected both in regards to cleanliness and the quality of the welds, several months of defining a repair strategy and implementation of corrective measures followed. This work resulted in an approved multi-step method for flushing the interior of the piping system and an advanced re-welding process.

With the first block in place and all procedures running smoothly, a ramp up in inner shielding installation is expected over the next months.

Target Test Stand

Preparations to install the moderator/reflector plug next to the Target wheel assembly inside the Target mock-up and test stand is now under way. The equipment will be lowered into the bucket adjacent to the wheel. Functional synchronised testing will then be performed inside the test stand.

Neutron Beam Port Inserts (NBPI)

Optics have been installed inside the Neutron Beam Port Insert for C-SPEC. Vacuum tests will follow.

With the Target Monolith inner shielding installation now back on track, preparations to start the north sector installation of Neutron Beam Port Inserts and Plugs (NBPI and NBPP) as well as Neutron Beam Windows, are under way. 

Instruments

BEER

Installation of the section 2 BEER guide, which comprises 64.5 metres of neutron guide integrated into vacuum housing, is completed. Final leak tests and final acceptance tests are now to be held.

Section 1 BEER guide, starting a few metres from the west bunker wall, will follow in a couple of weeks. This section is 48.6 meters long.

Siteplan Archive
Inner shielding

Steel shielding block lowered into the Monolith vessel.

Shielding block in place

Shielding block in place. The moderator bucket is seen roughly in the centre of the block.

wheel

The moderator bucket next to the wheel inside the Target test stand.

E01 NBOA CSPEC neutron guide

Details of the C-SPEC neutron guide assembled inside an insert.

E02 BEER section 2 guide

BEER section 2 neutron guide in place.

G02 cell 190 modulator

The last medium beta modulator in position.

G02 DTL-w cleanroom DTL-5

DTL5 drift tubes installed inside a cleanroom.

G02 NCG

Modulators, klystrons and waveguides in the normal conducting gallery.

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