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NUSTAR Newsletter 2 / 2019

Dec 20, 2019 Introduction This newsletter is a summary of recent events and information regarding the FAIR-NUSTAR project and activities of the various NUSTAR committees.

Note that any information on highlights or upcoming meetings can be found on the NUSTAR@FAIR web page (see http://nustar.fair-center.eu). You can send your material to NUSTAR@fair-center.eu. Suggestions are always welcome. Upcoming meetings (selection)

• March 2-6, 2020: NUSTAR Annual Meeting 2020 • May 14-15, 2020: FAIR AFC • July 2-3, 2020: FAIR Council • September/October 2020: NUSTAR Week in Portugal (date and location tba)

News from FAIR FAIR construction The progress of FAIR constuction is documented on a regular basis by use of drone videos. Since the last NUSTAR newsletter, a couple more videos have been published on YouTube: flight through the SIS100 tunnel, and drone videos from September 2019 and November 2019. Additional photos can be found here.

Screenshot of the November 2019 drone video as posted on YouTube.

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FAIR Phase-0 experimental program Good news from FRS at GSI, which was successfully repaired and tested. During the 2019 engineering run (Nov-Dec 2019) several tests have taken place including checks of the control system and data acquisition. DESPEC and R3B conducted additional tests of their Phase-0 setups in preparation of the upcoming beam time in 2020. Further details on the GSI beam time schedule can be found on the GSI web site.

A call from the GSI Program Advisory Committee (G-PAC) is expected early 2020, which aims at new proposals for the beam time in 2021. The management of FAIR/GSI confirmed that FAIR Phase-0 beam time will be provided at least up to the year 2023. Therefore, the NUSTAR Collaboration will discuss the new proposals and further ideas at the upcoming NUSTAR Annual Meeting 2020. Welcome office In September 2019, the new “Welcome Office” of FAIR/GSI was established. The Welcome Office will be the central contact point for guests and users and its team will take care of

• Guest contracts • Advice on health and liability insurance for guests • Settlements within the French- German-Collaboration Agreement IN2P3-CEA/DRF-

GSI and several EU Transnational Access treaties (ENSAR, STRONG, Laserlab Europe) • Guest invitation letters for visa applications

The implementation is still in progress, but as soon as the Welcome Office is fully operational, there will be the possibility of an online registration for guests and users prior to arrival at FAIR/GSI (by use of Home Institution Declarations).

Contact details: welcome-office@gsi.de Phone: +49 6159 71 3310 Room: SB1.1. 202b Office hours: Mon-Thu, 09:00-12:00 (or ask for an individual appointment) News from the Boards and Committees NUSTAR Council In September 2019, the NUSTAR Council (NC) members elected a new Chair, Nasser Kalantar-Nayestanaki, who will start his three-year term in January 2020. At the same time, Berta Rubio was chosen as the Chair-elect, acting as Deputy Chair. She will take over as Chair in 2023.

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NUSTAR BR and NUSTAR CC The NUSTAR Board of Representatives (BR) worked together with the NUSTAR Collaboration Committee (CC) on the preparation of documents and reports for the FAIR committees. Status reports were provided to the FAIR AFC, the FAIR/GSI Joint Scientific Council (JSC), and the Expert Committee Experiment (ECE) as well as the Experiment Cost Scrutiny Group (ECSG). A delegation also participated in a FAIR/GSI Research Division retreat in order to discuss the Phase-0 program and the needs of the NUSTAR Collaboration with the FAIR management and the other FAIR experiment collaborations. The BR and CC welcomed the decision of the FAIR/GSI management to provide 3-4 month per year beamtime for experiments at GSI for the next years. Also the installation of the new Welcome Office for users and guests was very much appreciated. In 2020, one of the main tasks will be the work on the NUSTAR MoU and refining the NUSTAR organizational structure in close relation to the work in the NUSTAR Council. NUSTAR Technical Board (TB) The NUSTAR Technical Board monitored the progress of installation planning and the status of building infrastructure planning. The NUSTAR infrastructure team is continuously working on all aspects related to the local infrastructure (gas supply, cooling water, pressurized air, power consumption, etc.) and to cross-check information provided to civil construction. Almost all TDRs required for the Day-one configuration have been approved or are submitted. The last ones are expected early next year. The TB will afterwards also look into the follow-up of the construction of components and their implementation in the experimental caves. To this end, emerging technical risks and mediating actions will be defined and monitored such that the status can be reported as requested by the ECE and ECSG of FAIR. NUSTAR Resource Board (RB) Representatives of the NUSTAR Resource Board participated in the 9th FAIR Resources Review Board meeting, which took place November 26-27 at GSI. There was no major change of the Day-one configuration and the respective experiment cost. About 94% of the required funding for the Day-one configuration has been received or is expected to come from the FAIR budget. The remaining funding is still under discussion: there are some expressions of interest, and additional funding, particularly for infrastructure items, is expected to be covered by a Common Fund. Therefore, the main task for 2020 is the preparation of the NUSTAR Construction MoU, which will also define the NUSTAR Common Fund. Super-FRS Experiment, as new NUSTAR sub-project, is moving closer towards becoming a recognized FAIR experiment. The present funding status and its Day-one configuration were presented at the ECE/ECSG and FAIR-RRB meeting, and it is expected to come to a conclusion in summer next year. Furthermore, a couple of in-kind contracts with FAIR shareholders have been signed and new contracts are in the pipeline.

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Meetings NUSTAR Week 2019 NUSTAR Collaboration meeting in Gif-sur-Yvette

The NUSTAR Collaboration met at the CNRS campus in Gif-sur-Yvette, France, from September 23 to 27 during the NUSTAR Week 2019. This was the 11th international meeting in a series, this time hosted jointly by colleagues from CEA/IRFU, CNRS/CSNSM, CNRS/CENBG, CNRS/IPNO, and CEA/DAM.

The meeting was well attended by more than 80 scientists. Besides the sub-collaboration meetings of HISPEC/DESPEC, R3B, Super-FRS Experiment, MATS and LaSpec, the gSPEC collaboration of HISPEC/DESPEC discussed the next step towards the realization of g-factor experiments at NUSTAR/FAIR.

The plenary program of the meeting was opened with the presentations by Paolo Giubellino, Scientific Managing Director of FAIR, and Wolfram Korten, NUSTAR Spokesperson, giving an overview on the status of the FAIR project and the NUSTAR Collaboration, respectively. Members of the French groups from CEA and CNRS presented their plans for NUSTAR experiments. The NUSTAR sub-collaborations presented their first results of the FAIR Phase-0 experiments or the status of the experimental setup waiting for receiving beam for first tests of new equipment.

For details see conference web page.

Participants of the NUSTAR Week 2019.

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News from the NUSTAR experiments and Super-FRS Super-FRS Collaboration Contract FAIR-BINP (Novosibirsk) for construction of radiation-resistant dipole magnets signed

The Budker Institute of Nuclear Physics (BINP) in Novosibirsk, Russia, has already developed – as part of an EU program - the first-of-series (FoS) radiation resistant dipole magnet, which will be installed in the target area of Super-FRS. The magnet is completely organic-free; in particular the coils are based on mineral insulated cables (MIC). The total weight of the magnet is 95 tons. During the acceptance tests, the magnet achieved all required magnetic properties, but some magnet interfaces as well as the support frame had to be revised with respect to remote handling issues.

In April 2019, the Collaboration Contract between FAIR and BINP was concluded which foresees the production and delivery of the remaining two dipole units. The kick-off meeting took place at GSI on May 20, 2019 and the CDR (Conceptual Design Report) is still expected in December 2019. The most important sub-component, the MIC cable, is already procured from a Canadian company, stored at GSI and ready for delivery to BINP.

Left: FoS dipole magnet assemble at GSI for the Site Acceptance Test SAT (the blue frame around the dipole

magnet simulates the beam tunnel around the target area); Right: participants at the kick-off meeting in May 2019.

Contact: Martin Winkler (GSI) Super-FRS Shielding Flask In-kind contract signing and procurement for 2020

In December 2019, the In-Kind Contract (IKC) for the Super-FRS beam shielding flask will be finalized and signed. The shielding flask will be provided by the Helsinki Institute of Physics (HIP). The work package consists of a shielding flask, support equipment, and control system. The shielding flask system is a specialized remote maintenance and handling unit that weighs up to 60 tons. The shielding flask will provide the safe and secure transport of the Super-FRS activated beamline components to the hot cell for maintenance. The p-bar group has an additional 30 tons heavy shieling flask for the target station remote handling, which will be a Swedish in-kind contribution to FAIR.

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The initial concept design for the shielding flask has been developed in house at GSI. The Super-FRS and the p-bar team at FAIR along with the In-kind partners will start the joint shielding flasks procurement process in the middle of January 2020, with the FAIR procurement department. The design process of the shielding flask is planned for August 2020.

Super-FRS shielding flask and support platform concept design CAD models (Photo: F. Amjad, GSI)

Contact: Faraz Amjad and Helmut Weick (GSI) Super-FRS Agreement on Super-FRS Local Cryogenics Scope and Cost Split between WUST and BINP

Within the 3rd BINP-FAIR Collaboration Coordination Workshop, which was held 25th – 29th November 2019 at BINP (Novosibirsk), an agreement on scope and cost sharing of the Super-FRS Local Cryogenics work package, between GSI/FAIR and the In-Kind partners WUST (Wrocław University of Science and Technology) and BINP (Budker Institute of Nuclear Physics) was reached.

The teams of WUST, BINP, and GSI/FAIR with the signed agreement, in the BINP accelerator control room

(Photo: A. Bergmann, GSI).

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While BINP will provide the central branch box and its connections, the warm piping system, and manufacture 18 of the feed boxes, WUST will provide the general system design, 45 feed boxes, 7 end boxes, all jumpers, and all other connection lines.

2020 is foreseen for the system and components and design, followed by manufacturing within 2021 and the first half of 2022. Installation shall proceed branch-wise and is scheduled throughout the course of 2022.

Contact: Felix Wamers (GSI) and Haik Simon (GSI) R3B CALIFA mounted for Phase-0 program

CALIFA, the calorimeter of the R3B experiment, has been mounted in Cave C at GSI during the fall, including the installation of its new support structure, for use in FAIR phase-0 experiments in 2020. The calorimeter, positioned around the target in front of the GLAD magnet, consists of CsI(Tl) detector crystals with APD readout, and a dedicated DAQ, based on the GSI FEBEX system with special FPGA algorithms developed at the Technical University in Munich. At this stage 1204 CsI(Tl) detector units have been mounted. The work on the CALIFA calorimeter is a coordinated team effort by physicists from Germany, Portugal, Russia, Slovenia, Spain and Sweden.

Left: Jason Park of Lund University, Sweden, during mounting of detector units in the inner support structure of the CALIFA calorimeter. Physicists and engineers from Santiago de Compostela, Madrid, Vigo, Munich, Darmstadt, Lund and GSI worked together to mount CALIFA in its new support structure in Cave C. Right: The first half of the inner structure of the CALIFA calorimeter mounted in the new external frame. The mechanics of the frame was designed and manufactured in Vigo, Spain, and transported to GSI for mounting. Visible in the picture: the internal carbon fibre structure that supports the detector units and the external exoskeleton and its connection to the new external frame. (Photos: J. Cederkall and K. Göbel).

Contact: Joakim Cederkall (Lund University)

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Super-FRS Experiment Approved TDRs for the Cryogenic Stopping Cell and general infrastructure for Super-FRS

The TDR of the Cryogenic Stopping Cell (CSC) of the Super-FRS has been approved by the ECE. The CSC is the key device for experiments with thermalized beams at FAIR. It will convert the high-intensity, high-quality beams of the Super-FRS into cooled beams for the high-precision experiments, such as MATS and LaSpec. The CSC will be built by Justus-Liebig University Gießen, GSI, University of Jyväskylä, Tel-Aviv University and KVI-CART within the Super-FRS Experiment Collaboration. The collaboration has also developed a dedicated physics program for the device including in-cell decay studies and reactions studies at and above the Coulomb barrier.

Digital mock-up of the LEB cryogenic stopping cell.

The approval of the Infrastructure TDR is another important step to realize the diverse science program of the Super-FRS Experiment Collaboration. In this TDR, the different additional smaller detector systems for the planned experiments are included and their construction can now progress quickly so they can be used soon in coming experimental runs.

Contact: Timo Dickel (GSI) ILIMA Successful test of new Schottky pick-up at ESR

In a previous issue, we reported on the construction of a new 410 MHz resonant cavity pickup for longitudinal Schottky analysis as part of the ILIMA Project at the Collector Ring at FAIR. This pickup has many new features compared to the 245 MHz cavity pickup, which was installed in the ESR in 2010 [1]. Unlike the previous design, the new pickup features no movable part in the body section. Using materials such as stainless steel and fewer number of mechanical parts, it was possible to reduce the overall construction steps and avoid resource-intensive ones like copper coating of the interior parts. The plunger drive units have also undergone major redesign, leading to a reduction of weight and number of

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mechanical parts as well. From the point of the RF-tightness, the new design has several advantages, since the ceramic gap has been removed, which originally caused a degradation in signal intensity, and also RF-copper bands are no longer needed. As a result the overall Q value is 3 times higher than the old design. Like the old design, the resonant cavity pickup is tunable around its eigenfrequency, but with an extended range of 4 MHz. The Q value and hence the sensitivity can be changed any time by inserting an RF damping blade, such that the impedance of the resonator can be changed in order to avoid a possible disturbance on high current beams.

For testing purposes, this new pickup was installed in the experimental storage ring ESR and was successfully commissioned in 2019 using Argon and Uranium beam. A detailed report is in preparation [2]. The following figure shows the 240th harmonic of the signal of a 250 MeV/u 40Ar18+ beam with 185 µA of current at 407.855 MHz. As a result of the installation in the highly dispersive arc section of the ESR, betatron side bands are visible around the main peak at about 435 kHz distance. The left-hand sideband appears to be more intense since the resonance frequency of the resonator is tuned to further left side of the plot. Although this is not the main application of the longitudinal resonator, these sidebands can be used to measure the horizontal fractional tune. Further experiments using beams containing other nuclear isotopes are planned for future.

240th harmonic of the signal of a 250 MeV/u 40Ar18+ beam with 185 µA of current at 407.855 MHz.

References: [1] F. Nolden et al., Nucl. Instr. Meth. A 659, 69 (2011) [2] S. Sanjari et al., manuscript submitted to RSI

Contact: Shahab Sanjari (GSI)

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NUSTAR in-kind contracts NUSTAR in-kind contracts for MONSTER and DEGAS signed in Kolkata

Signature ceremony at Bose Institute. From left to right: Tapan Dutta (Senior Scientist, BI), Anup Kumar Mishra (Registrar, BI), Paolo Giubellino (Scientific Managing Director, FAIR), Uday Bandyopadhyay (Director of Bose Institute), Sanjay Ghosh (coordination of FAIR projects at BI), and Subhasis Chattopadhyay (programme director of BI-IFCC).

On Monday, 4th November 2019, the in-kind contracts for the Indian contributions to MONSTER and DEGAS were signed by the Scientific Managing Director of FAIR, Prof. Paolo Giubellino, and the representative of Bose Institute (BI), Prof. Anup Kumar Mishra. The signature ceremony took place at the Bose Institute in Kolkata, India. The Bose Institute is acting as Indian Shareholder for FAIR, working together with the Indo-FAIR Co-ordination Centre (IFCC) at Bose-Institute, which is coordinating the FAIR related activities in India. Besides the two NUSTAR in-kind contracts, an in-kind contract for power converters for SIS100 and HEBT as well as an in-kind contract for the Muon Chamber System (MUCH) of the CBM experiment were signed as well. This marks another major step for our Indian partners in the construction of accelerator components and detector systems for FAIR.

Contact: Alexander Herlert (FAIR)

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Some acronyms AFC Administrative and Finance Committee of FAIR BFC Board of FAIR Collaborations BR NUSTAR Board of Representatives ECE Expert Committee Experiments ECSG Experiment Cost Scrutiny Group JSC FAIR/GSI Joint Scientific Council MoU Memorandum of Understanding NC NUSTAR Council PAC Program Advisory Committee RB NUSTAR Resource Board TB NUSTAR Technical Board TDR Technical Design Report