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05 September 2022

Accelerator

DTL4 installation

Preparations are ongoing to start the installation of Drift Tube Linac tank 4 in the normal conducting linac. A small vacuum leak was repaired and a water manifold installed on top of the tank.

Power sources

Power tests, including klystrons in medium beta cells and the RF power stations feeding the Spoke section of the linac, are ongoing.

Power tests in the Normal Conducting Gallery have also restarted in preparation for the next phase of beam commissioning to include Drift Tube Linacs 2-4.

Upgrades to the E-bends of the waveguide system, carrying RF power from the gallery-side to the Accelerator via the stubs, are ongoing.

Cryogenics

Leak testing of the Cryogenic Distribution System is in progress, with detected leaks subject to repair. The entire system, from cryoplant to end box and back, need to be leak tights before proceeding with the installation of cryomodules to the valve boxes.

Cryomodules

Medium beta cryomodule CM07 is being prepared for testing inside the on-site test bunker. The objective is to have seven out of a total nine medium beta modules fully tested and ready for installation before the end of this year. 2023 will start with cooldown and tests of the very first high beta cryomodule.

Nine out of 13 double-cavity spoke cryomodules are in the ESS workshop building, made ready for installation. Remaining four spoke modules will be tested at the Freia lab at Uppsala University and delivered to ESS before the end of 2022.

Target

Representatives from Thune Eureka, subcontractor to ESS Bilbao, have been on site this week to assist in adjustment works to fit the shaft onto the Target Wheel inside the Mock-up and Test Stand in the Transport Hall.

The full 12,3-metre long Proton Beam Drift Room pipe is in place in the narrow space connecting the Accelerator to Target building with the remote clamp inside the Monolith connection cell.  Precise alignment and vacuum tests are next.

Instruments

Experimental Hall 1

The ESTIA Selene guide 2 is in place on a steel support structure.

Light Shutter System frames have been fitted inside the south sector of the bunker, with basement works ongoing.

Experimental Hall 2

Fitting of raceways for electrical installations under the LOKI detector tank is in progress.

In the west corner of the D03 hall a chopper workshop building is under construction.

BIFROST bandwidth chopper

The very first neutron chopper for ESS has been installed for instrument BIFROST. The 14 hertz double disc chopper has been placed in the middle of the 160-metre-long neutron guide for the instrument, in the E02 beamline gallery.

Choppers are devices placed along the instrument beamlines for each instrument. A rotating disc with slits will let through only the desired range of the neutron pulse, suitable for the instrument and experiment conducted. Phasing of choppers is done with the ESS timing system, synchronised with the proton beam at 14 pulses per second.

Siteplan Archive
E02 BIFROST chopper team

Parts of the ESS chopper group and BIFROST instrument team by the chopper in the Beamline Gallery.

D01 ESTIA Selene guides

ESTIA, delivered to ESS via Swiss in-kind partner PSI, occupies the first beamline in the east sector. Two Selene guides have been positioned.

D03 LOKI detector tank

The LOKI detector tank from above.

D01 LSS frames South

Light Shutter System frames, the interface between the port tubes and the neutron guide system, under installation in the south sector of the neutron shielding bunker.

G01 A2T PBDR pipe

The Proton Beam Drift Room pipe. Protons traveling at 95% of the speed of light will pass here on their way to the Target.

G01 NCL tunnel

An upstream view from the Ion Source. The Target is located about 600 metres from here.

G01 tunnel

Superconducting Linac.

G02 Gallery from NCG

Normal Conducting Gallery.

G02 Gallery

A view down the 489-metre-long Klystron Gallery building.

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