Status of the CCC for CRYRING / FAIR 24th June 2019, CCC Collaboration Meeting, CERN Thomas Sieber Status of the CCC for CRYRING / FAIR CCC Collaboration Meeting Thomas Sieber 24th June 2019 1

Outline CCCs ar CRYRING and FAIR - Status of the Cryostat   CCCs ar CRYRING and FAIR - Status of the Cryostat Experimental work Time schedule CCC Collaboration Meeting Thomas Sieber 24th June 2019 2

CCC at CRYRING / FAIR FAIR GSI Cryring Non-destructive intensity measurement for low intensity beams at FAIR Examples: Proton Linac UNILAC SIS18 SIS100 FAIR 1) Slow extracted beam from SIS100 Extraction time up to 10 s GSI CBM Cryring PANDA Super FRS Cycle Ion species Energy No. of particles Extraction time Max. Current RIB U28+ 2.7 GeV/u 5E11 2 s 1.12 µA CBM U92+ 10.6 GeV/u 1.5E10 10 s 22 nA HESR CR NuSTAR CCCs original planning CCCs additionally 2) Circulating Beam in Collector Ring (CR) Basic idea of CCC: Precise measurement of azimuthal magnetic field (fT-range) using DC-SQUIDS Mode Species Energy Intensity Revolution Frequency Max. Current pBar 3 GeV < 1E8 1.37 MHz 22 µA RIB U28+ 740 MeV/u < 1E9 1.17 MHz 5 mA Isochr. 790 MeV/u 1E8 1.18 MHz 529 µA CCC Collaboration Meeting Thomas Sieber 24th June 2019

Status of the FAIR Cryostat Preliminary cryostat design finished mid 2016 Funding problems, FAIR budget not available (CCC as HEBT diagnostics) Funding confirmed by HIJ beginning of 2018 Call for tender 03/2018 Contract signed with ILK Dresden 06/2018 4 + 5 months for detailed design and production, costs 140 k€ problems with ceramic gap, delay and additional costs (25 k€) (delay partly caused by enthalpy cooling design) steering meeting Dec. 2018, deadline for detailed drawings 02/2019 review of 2D drawings March – June ceramic gap ordered 04.06. (34 weeks delievery time) production starts NOW, 14 months after delivery time fixed in contract Meeting with ILK next week ... CCC Collaboration Meeting Thomas Sieber 24th June 2019 4

Design of the CCC for FAIR FAIR/CRYRING cryostat Top plate, feedthroughs, He filling FAIR CCC (FAT in April 2017) 850 Vacuum chamber (AISI304) Windows (Al) 250 mm Suspension rods (Ti) He lines / enthalpy cooling Thermal shield (Cu) MLI 65 kg 1200 Liquid He container WEPCF07 V. Tympel CCC 150mm UHV beam tube (ceramic gap) System costs Nb CCC 180 k€ Cryostat 200 k€ Liquefier 80 k€ SQUID + electronics 15 k€ DAQ 20 k€ Support 5 k€ Total ~ 500 k€ Goal < 300 k€ Thermal shield tube (air gap) He container inner tube (ceramic gap) Pickup unit PEEK spacers Connection to refrigerator (Cu strips) CCC support  ANSYS© model for vibration analysis 24th August 2017 IBIC 2017 Thomas Sieber 5

Cryostat for CRYRING / FAIR Safety valves Exhaust line He filling line Fixation point suspensions Aluminum windows and handles He container Steel frame CCC Thermal shield with cooling lines Maintenance windows shield / He container Beam tube Bottom plate, conn. for turbopump and coldhead CCC Collaboration Meeting Thomas Sieber 24th June 2019

Isolation Vacuum Chamber Frame - Stainless steel 1.4306 - Frames welded together CCC Collaboration Meeting Thomas Sieber 24th June 2019

Thermal Shield I Designed for enthalpy cooling 15 m tube, 10 mm ID cold head connection at bottom shield separately fixed at top plate by threaded rods CCC Collaboration Meeting Thomas Sieber 24th June 2019

Thermal Shield II Exhaust line connected at the shield bottom first  ascending gas during warmup CCC Collaboration Meeting Thomas Sieber 24th June 2019

He Container 2 maintenance windows equal length suspensions calculated by NM CCC Collaboration Meeting Thomas Sieber 24th June 2019

Experimental Work liquefier in operation 15 l/day ok Production of UHV cryostat is running. Installation in CRYRING in 2020 1200 Liquefier Head Vacuum Chamber Aluminum Window Thermal Shielding Beam Tube Helium Container CCC Shield + Detector Steel Frame liquefier in operation 15 l/day ok vibration measurement with acc.meter and SQUID ongoing (Master Thesis) Next step, Design of exhaust line and improved controls radiation tests with SQUIDS performed (09/2018; 1 kGy) CCC Collaboration Meeting Thomas Sieber 24th June 2019

Summary / Time Schedule Next steps: ILK guaranteed production until October FAT and SAT part 1done with dummy beam tubes Bakeout tests at GSI (hallogen lamps) Feb/March Sat part 2 with ceramic gaps Installation in CRYRING mid 2020 In the meantime: Construction of coreless CCC at IPHT (Sep.) Design of exhaust gas system Prepare test setup at GSI We still rely on modular setup and easy replacement of components in case of problems CCC Collaboration Meeting Thomas Sieber 24th June 2019

Space (temporary) available for CCC Tests in CRYRING start 2020 CCC Test/Operation in Cryring@ESR Cryring = Swedish inkind contribution to FAIR Beam from ESR for Atomic Physics experiments Currently under commissioning (vacuum, ecool) Remains operational during FAIR shutdown !!! CCC: → tool for commissioning → support for experimental program → test bench for further development CCC test program - Radiation hardness test at SIS18 in 2018 beamtime After CRYRING installation in 2020 - check new cryostat design + reliquefier scheme - verification of FAIR CCC lab results - Lead / Niobium comparison - alternative shielding geometries  CCC without toroid / new SQUID types - FESA class for CCC - improve MAGNICON electronics - bakeable CCC version ? And in the following - CCC with reference SQUID - CCC cascades for enhanced dynamic range - resonant operation for single particle detection + many other new ideas  Space (temporary) available for CCC CCC Collaboration Meeting Thomas Sieber 24th June 2019 13

Thank you for your attention ! CCC Collaboration Meeting Thomas Sieber 24th June 2019 14