Cavity processing and tests in 2018 1942018 Cavity

Cavity processing and tests in 2018 19/4/2018

Cavity and CM to process/test (2018 -2020) • • • LHC spare cavities LHC spare cryomodule Crab: RFD prototypes and CM Crab: DQW prototypes and pre-series HIE ISOLDE spare cavies HIE ISOLDE cryomodules High Gradient 800 MHz (for FCC) 1. 3 GHz (R/D, cryolab + new cryostat) WOW prototypes …

2018 Workload • LHC spare cavities (10) • LHC spare cryomodule • Crab: proof-of-principle (POP) cavities • HIE ISOLDE spare cavies (3+) • High Gradient • 800 MHz (for FCC) • 1. 3 GHz (R/D) • QPR (on-going program + commissioning of new QPR)

Cold tests (2018) Planning elaborated at the beginning of the year. LHC and Cryolab test activities are about on time, delays on the other programs Some disruptions caused by infrastructure upgrades (cabling work, etc. )

Operational SRF infrastructure (19/4/2018) Bldg. 252: ISO 5 clean room and LPWR facility. Used for Nb/Cu (LHC, HIE ISOLDE), QPR preparations, and ancillaries Coating systems (TE-VSC): 2 HIE ISOLDE and one LHC SM 18: • ISO 5 -ISO 4 clean rooms, HPWR facility • Vertical cryostats • • V 3 (2 K operation, now used for CC and HG) V 5 (mainly for 4. 5 K, dedicated to HIE ISOLDE cavities) V 6 (mainly for 4. 5 K, dedicated to LHC cavities) V 4 to become operational soon

2018 Work • LHC spare cavities (10) • LHC spare cryomodule • Crab: proof-of-principle (POP) cavities • HIE ISOLDE spare cavies (3+) • High Gradient • 800 MHz (for FCC) • 1. 3 GHz (R/D) • QPR (on-going program + commissioning of new QPR)

LHC spare cavities: remarks PC 5 performance well above specs flawless coating/preparation chain • Cold test set-up upgrade: improve safety, throughput, measurement accuracy

2018 Work • LHC spare cavities (10) • LHC spare cryomodule • Crab: DQW prototypes and pre-series • HIE ISOLDE spare cavies (3+) • High Gradient • 800 MHz (for FCC) • 1. 3 GHz (R/D) • QPR (on-going program + commissioning of new QPR)

LHC spare cryomodule test: remarks Goals of the exercise: • • re-qualify “AMERICAS” after exchange of the pumping crosses Assess static heat load document hardware and procedures train new staff in LHC CM testing Be ready to exchange one of the LHC CM with the refurbished one Work is proceeding well: CM entered in the clean room on April 18 th M 9 bunker preparations on-going (meeting later this morning) Aim for a cold test end of June. One month margin before SM 18 cryo-shutdown

2018 Work • LHC spare cavities (10) • LHC spare cryomodule • Crab: proof-of-principle (POP) cavities • HIE ISOLDE spare cavies (3+) Exercise on bulk Nb cavity preparation, • High Gradient pushing performances, LLRF tests, quench detection, fundamental studies • 800 MHz (for FCC) (flux trapping etc. ) • 1. 3 GHz (R/D) • QPR (on-going program + commissioning of new QPR)

2018 Work • LHC spare cavities (10) • LHC spare cryomodule • Crab: proof-of-principle (POP) cavities • HIE ISOLDE spare cavies (3+) • High Gradient • 800 MHz (for FCC) • 1. 3 GHz (R/D) • QPR (on-going program + commissioning of new QPR)

HIE ISOLDE spares: remarks 5 spare cavities in the scope of the HIE ISOLDE project: Status QSS 2: fully qualified (record breaking cavity) QS 20: qualified but poor performance, foresee rinsing and re-test QS 18: coated before Christmas and still waiting for cold test QSS 3: third seamless cavity, recently delivered, helium port being welded QS 15: defects on the substrate, selected for “swaging” exercise Using leftover (bad) substrates: a fourth seamless spare would be an asset Spare cryostat insert to be put in operation • HIE ISOLDE commissioning on-going. • One RF line is damaged, OK for 2018 but will have to intervene during LS 2

2018 Work • LHC spare cavities (10) • LHC spare cryomodule • Crab: proof-of-principle (POP) cavities • HIE ISOLDE spare cavies (3+) For the R/D on Nb/Cu and A 15 (FCC, ARIES, • High Gradient EASITRAIN, etc. ) • 800 MHz (for FCC) New 1. 3 GHz substrates still missing end flanges Push Mechanical/Electro Polish of copper cavities • 1. 3 GHz (R/D) • QPR (on-going program + commissioning of new QPR)

Cold test coordination Meetings Topics addressed: • Safety matters • Changes and upgrades of cold test infrastructure and tools • Quality assurance • Medium and long term planning of cold tests

Hazards at SM 18 (non exhaustive list…) • Electrical risk (racks, circuit breakers, ionic pumps, etc. ) • X-rays (new access system operational around mid May • High power RF (klystrons) • Cryogenics risks • Heavy manipulations, overhead loads: • We use electric forklift trucks, magnet transporters and small chariots. Energy storage in batteries, and three phase overhead lines are sources of danger. • Approaching transport equipment is always dangerous. At CERN many such systems are operated using large batteries or overhead lines with brush sliders.

Changes and upgrades of cold test infrastructure and tools: some ideas on the table • Proposals to change V 6 preparation on insert (vertical assembly; re-do pumping line to allow for mobile coupler) • V 6 magnetic shielding, active field compensation, magnetic field sensors • Helium guards for V 5 and V 6 (to allow secure operation at 2 K) • M 9 refurbishing for LHC cryomodule tests (including RF control room) • New cryostat for small cavities (with shielding): Cryolab? M 7? • Use of HIE ISOLDE clean room? • Ancillary services for the ISO 4 clean room (pumping lines, gas, etc…) • Tooling for cavity manipulations in ISO 4 -HPR: do we have all we need? • HPR accessories to rinse other types of cavities (for example QWR) • …

Quality assurance topics • Mobile coupler for V 3, V 4, and V 6 • Digital LLRF for V 3, V 4 and V 6 • Software interfaces • Procedures for all the phases of cold testing • Standard reports of tests results • Inventory of RF components and instruments • Periodic calibrations (of RF components and instruments) • …