General current status and a nice technical achievement of last week 43 (19-23/October)

Maintenance of Injector and Injector vacuum

The maintenance of the injector and its annexed LEBT (Low Energy Beam transport) was completed with the maintenance of the EMU (Emittance Meter Unit): visual inspection of tungsten tiles, insulation check among electrodes and ground, check of slit integrity and slit thickness were performed. The slit thickness (0,1mm) was found to be aligned with the values measured last year and judged satisfactory to operate in Phase B+.

EMU extracted from the LEBT (left) and close-up on the EMU slits (right). The EMU aims to measure the emittance profile of the beam.

Before resuming injector operation in November, the maintenance of the injector vacuum chamber has to be completed. This week the former turbomolecular pump was replaced by an identical one.

Replacement of the Injector vacuum chamber turbomolecular pump: the position, size and weight of the pump make this operation challenging. This time the flat bench was newly installed for easy access.

HEBT (High Energy Beam transport) commissioning

The HEBT (High Energy Beam Transport) and the Beam Dump are the last parts of the LIPAc currently in commissioning phase. After few issues on the HEBT cooling skid and one of its vacuum chambers (HEBT sector IV), this week the skid operation was successfully resumed and the vacuum in sector IV recovered after fixing the leak at the viewport flange. From next week the checks and fine tuning of the HEBT magnets can restart with CIEMAT remote support.

Disclaimer: the information reported is not meant to be technically complete and doesn’t cover all the activities currently carried out on LIPAc. 

General current status and a nice technical achievement of last week 42 (12-16/October)

Background information about general status

The LIPAC accelerator is currently shut down and in a planned long-term maintenance phase that is scheduled to be completed at the end of October.

One week intervention completed on 15/10. Modification of the beam line configuration in the MEL (Medium Energy Beam Transport Extension Line): installation of RGBLM (Residual Gas Bunch Length Monitor) chamber.

This is a complex intervention requiring venting of the beam line with N2, disassembly the turbolomecular pump, removing the vacuum chamber and installing a new vacuum chamber equipped with specific port to host the RGBLM sensor. The RGBLM in this position of the line will be an important instrument to monitor the beam in the next campaign.

The new RGBLM chamber after the completion of the installation in the MEL (the turbomolecular pump is placed horizontally and visible in the front)
Extended view of the MEL with the new vacuum chamber for the RGBLM

Disclaimer: the information reported is not meant to be technically complete and doesn’t cover all the activities currently carried out on LIPAc. 

IFERC and IFMIF/EVEDA Technical Coordination Meeting on remote participation

A joint IFERC/REC and IFMIF/EVEDA Technical Coordination Meeting was held on July 28-30 via videoconference. The purpose was the following:

  • To take stock of the activities and developments performed in both IFMIF-EVEDA and IFERC projects for remote participation for LIPAc accelerator;
  • To clarify the high-level requirements for remote participation;
  • To discuss the detailed technical issues on various aspects of remote participation, and translate them into practical requirements;
  • To identify preferred solutions, agree on the hardware and software needed in data sharing, and on a distribution of tasks and responsibilities.

The plan of collaboration between REC and LIPAc will be part of a Procurement Arrangement of REC project. The expertise of IFERC team will allow LIPAc team to improve operation and maintenance. The Covid-19 outbreak has highlighted the importance to enhance the Information Technology remote system to allow support from Europe, and also to complete and improve the tools to operate and to manage efficiently the LIPAc accelerator.

In the Technical Coordination Meeting various visions, expectations and needs have been expressed. More discussion and work will be needed to share a common understanding of the high-level requirements, technical tools and preferred solutions to be developed.

This Joint coordination is the beginning of new phase which will enable us to exchange intensively to bring our projects and the Broader Approach site at the cutting edge of technology.  Remote participation systems are not just tools that can improve LIPAc operation. They are research subjects, proposing innovating concepts which will become the future standards.

Real-time information shared between QST and F4E

LIPAc maintenance progress

06 July 2020

LIPAc maintenance activities are on-going. On-sites activities have never stopped, but they were slowed down during a period of recommended teleworking due to Covid-19 outbreak. It is not yet possible for EU experts to travel for supporting activities at the Rokkasho BA site.

The Medium-Energy Beam Transport extension line has been successfully manufactured and installed. It has been designed to transport the beam to the permanent Beam Dump at 5 MeV instead of the cryomodule. LIPAc is now upgraded into its future phase B+ (125 mA, D+, 5 MeV, high duty cycle) configuration, with its High Energy Beam Transport line and the Beam Dump.

Newly installed Medium-Energy Beam Transport extension line

Work is currently on-going with the following activities:

  • Licensing preparation with Japanese authorities;
  • Maintenance of LIPAc systems;
  • Start of a training campaign for operators and experts;
  • Setting remote participation tools to ease and increase participation of EU experts;
  • Resuming of the RFQ conditioning;
  • Preparation to resume operation with Phase B+ objectives.

Second LIPAc Commissioning and Beam Operation Workshop at QST (Rokkasho)

20, 21 & 22 November 2019

During stop for the scheduled maintenance, a long-planned LIPAc Commissioning and Beam Operation workshop was organized at the Broader Approach Rokkasho site on Nov. 20-22. The workshop gathered again the LIPAc collaboration after the completion of the commissioning Phase B (5 MeV, 125 mA, D+, 0.1% DC, including the commissioning of the RFQ and buncher cavities, as well as a large part of the beam instrumentation).

Commissioning and Beam Operation workshop #02 session

The LIPAc team has been pleased to welcome Dr. M. Munoz (ESS), Prof. E. Kako (KEK) and Dr. Y. Kondo (J-PARC) to share valuable experience. During 3 days, the accelerator scientists and experts from Japan and Europe exchanged about the operational aspects of the LIPAc:

  • Status, results, outcome and achievements of the phase B
  • Difficulties and lessons learned from commissioning and operation
  • Organization of the LIPAc Unit for operation and maintenance
  • Coordination and tools for efficient operation
  • Coordination and tools for efficient maintenance

Furthermore, the steps ahead for LIPAc were addressed, including:

  • On-going preparation of the beam transport lines for Phase B+ (5 MeV, 125 mA, D+, high duty cycle)
  • Detailed definition of the phase B+ Commissioning Plan
  • Preparation of the SRF Linac cryomodule assembly

The goal of the workshop is also to strengthen the communication and team spirit among IFMIF/EVEDA collaborators who are geographically distant in Europe and Japan. The conclusions and actions identified by the chairman in each session will be gathered into an action plan.

Attendees of the Commissioning and Beam Operation workshop #02

Project Committee #24

15 & 16 October 2019

The 24th Project Committee (PC#24) was held at Rokkasho Broader Approach Site on October 15 and 16. The project status and achievements were presented as well as the outlook from phase B+ onward. The main update topics discussed were:

  • RF system improvement
  • Phase B milestone beam perveance record
  • Beam Dump installation resumed
  • Phase B end and the maintenance period start
  • Technical difficulties
  • Next objectives towards continuous wave operation
  • Objectives of High Energy Beam Transport line and Beam Dump validation
  • Long-term improvement actions
  • Preparation of the Medium Energy Beam Transport extension line
  • Status of superconducting solenoids procurement for the SRF Linac Cryomodule
  • Preparatory status for the clean room assembly of the Cryomodule

The action plan for 2020 was presented for installation, maintenance and operation.

Attendees PC#24

LIPAc maintenance period and High Energy beam line installation

25 September 2019

After the completion of operation corresponding to the phase B, the maintenance activities have started mid of August as planned alongside the preparation of the next phase: phase B+. In this long maintenance period, it is important to carry-out both the curative maintenance of components that were malfunctioning and the preventive maintenance to ensure a better reliability and availability of the systems for the next operation campaigns. The maintenance activities are planned targeting to resume Injector continuous wave operation and Radio-Frequency Quadrupole (RFQ) conditioning before end of 2019, so that LIPAc operation can restart in the second quarter of 2020. In this first period higher priority has therefore been assigned to the Injector and RF/RFQ systems maintenance.

LIPAc configuration in phase B+

Maintenance activities of the Diagnostics-Plate and of the vacuum systems have also started; maintenance of the Medium-Energy Beam Transport line (MEBT) are planned in December. Specific activities on the beam instrumentation will be carried out in November with EU experts from CEA and INFN on-site. The final beam instrumentation checkout will take place after the installation of the MEBT extension line.

3-dimensional view of the MEBT extension line for phase B+

The maintenance of the ancillaries is on-going and many activities have already been completed, such as electrical network distribution, secondary cooling system, Personnel Protection System, Accelerator vault crane. The cryoplant maintenance activities will be carried out in the first quarter of 2020.

The upgrade of LIPAc into its future phase B+ configuration, with its High Energy Beam Transport line (HEBT), is also the goal of this maintenance period. The MEBT extension line has been designed to transport the beam at 5 MeV instead of the cryomodule. It is composed of quadrupoles to focus the beam, steerers to correct its trajectory, Beam Position Monitors to monitor the beam orbit, a vacuum chamber to host a Residual Gas Bunch Length Monitor, Beam Loss Monitors and turbo-pumps for vacuum pumping. The components of the MEBT extension line are currently being procured or manufactured.

Alignment and connection work for HEBT

The Low Power Beam Dump which was used during phases A and B will be removed. The HEBT is positioned in its final position together with the Diagnostics Plate, and the LIPAc Beam Dump for full beam energy will be connected to the beam line.