Title: Cavity Processing Experience At RRCAT - INDICO-FNAL (Indico)
Title: Cavity Processing Experience at RRCAT Authors: Shashikant Suhane, Anirudha Bose, S Raghavendra, Purushottam Shrivastava (On behalf of Cavity Processing, RRCAT) Raja Ramanna Centre for Advanced Technology, Department of Atomic Energy, India PIP-II Technical Meeting online @Fermilab USA Working Group : Cavity Processing and Testing July 12-14, 2022
650 MHz Cavity Processing experiences at RRCAT Two no.s of Single cell HB 650 MHz cavity (HB102 & HB104) Seven no.s of 5-cell HB 650 MHz cavity (HB501 – HB507) (Mid 2018 – Till Jun 2022) HB 507 July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 2
RRCAT Cavities in HB650 pCM at Fermilab Three β 0.92 cavities (502, 504 and 506) supplied by RRCAT have been assembled in HB650 pCM at Fermilab RRCAT-506 RRCAT-502 RRCAT-504 Curtesy: C. Grimm, Fermilab July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 3
650 MHz Cavity Processing at RRCAT Optical Inspection Assembly in Class 10 cleanroom July 13, 2022 Bulk Electropolishing ( 150µm) Degassing/ N-Doping @ 800 C – 3 hrs HPR (UPW 90 bar) S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava Light Electropolishing ( 20µm) Ultrasonic M90 (50 C 1 hr) PIP-II Technical Meeting 4
Electro-polishing Process Bulk EP (EB Welded Cavity received after Internal inspection) Removal of damaged layer 120 – 200 µm; Improve surface smoothness; Elimination of sharp discontinuities Light EP (Hydrogen degassed/ N- doped Cavity tuned to 98% field flatness) Removal of furnace contamination 20µm post Hydrogen degassing process Removal of nitride precipitate layer 5µm post N – doping process Parameters Range Parameters Range Voltage 15 – 18V Voltage 18V Current 175 – 225 A Current 110 – 135 A Current oscillation range 20 - 35A (peak to peak) Current oscillation range 35 A (peak to peak) Cavity temperature 17 – 25 C Cavity temperature 12 - 17 C Removal rate 0.1 – 0.12 µm/ min Removal rate 0.06 – 0.07 µm/ min July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 5
Electropolishing Facility at RRCAT Features: Temperature monitoring of each cell with 2 thermocouples. Uniformity in external cooling of each cell with dedicated flow at each cavity wall. July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 6
Thermal processing at RRCAT Hydrogen degassing Vacuum before heating 1 x 10-7 torr Heating @ 3 C/min to 800 C (in vacuum) Soaking for 3 hrs ( 5 x 10-6 torr) Cooldown in vacuum to 50 C July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 7
Cleanroom Infrastructure at RRCAT All the cavity processing facilities are set up under one roof at RRCAT. After fabrication and electropolishing the cavities are rinsed at high pressure using ultrapure water and assembled in ISO class 4 cleanroom. For this a new ISO class 4 cleanroom facility has been set up at RRCAT. Cleanroom July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava EP Enclosure PIP-II Technical Meeting 8
Cleanroom Facility at RRCAT CLEANROOM PARAMETERS Parameter Value Cleanliness ISO 4 and ISO 6 Air Change Rate 500 / hour Operating Temp. 20 2 C Relative Humidity 50% 5% CLEANROOM FEATURES Flooring Perforated raised floor Static dissipative epoxy paint on building floor Filters for ISO 4 Area HEPA/ULPA filter banks inside a plenum box Thanks to Genfa Wu and Fermilab team for support during cleanroom construction July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 9
HPR Infrastructure Ultrapure water generation plant PLANT PARAMETERS Parameter HPR Structure Value Ultrapure water Quality Resistivity TOC Bacterial count : 18 MΩ.cm : 20 ppb : 1cfu/100 ml Flow Rate 800 LPH Instrumentation Hydraulically actuated diaphragm Pump PUMP SPECIFICATIONS Parameter Value Max. Pressure 105 bar Flow rate 12 lpm Triplex-Sandwich diaphragm (PTFE) Pump head Wetted parts SS 316 Online Resistivity Online TOC July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 10
High Pressure Rinsing of Cavity HPR Parameters for 5 cell HB650 cavity Parameter Value Jet Pressure 90 bar Wand Rotation 2 rpm Cavity linear Translation 6 mm/min No. of passes 3 5 Final filtration 0.05 µm Nozzle type 40 fan jet Nozzle material SS 410 Cleanroom environment ISO class 4 July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 11
Cavity and Hardware Preparation in Cleanroom Hardware Preparation Ultrasonic rinsing M90 @ 50 C for 1 hr (After EP) External wiping of cavity with Ethanol in class 6 cleanroom Ultrasonic cleaning in micro90/citrinox Final assembly Drying for 24 hours July 13, 2022 Assemble top flange, MC &FP flange on HPR station Second HPR (5 Pass) Hand HPR using ultrapure water Blow off with ionized nitrogen First HPR of cavity (3 Pass) External HPR of cavity in cleanroom Drying in the HPR station overnight No Slow evacuation (8-10 hours) Leak Test Using RGA S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava Leak Test OK Yes Seal the cavity and Shift to VTS Facility PIP-II Technical Meeting 12
July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 13
Evacuation of Cavity Pumping cart Vacuum leak testing and slow pumping of cavity Slow evacuation of cavity is carried out using a fine control leak valve July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 14
Integrated cleanroom facility in cavity Processing Facility Building AHU for Mini Cleanroom D4 D4 D4 Mini Cleanroom D2 PLATFORM D2 D2 A 1 EP Set up CBP M/c UPW Plant D2 AHU for Large Cleanroom Cleanroom under construction Large Cleanroom An integrated cleanroom facility for HPR, cavity assembly, string assembly, tuning and high temperature hydrogen degassing Total Area of cleanrooms: 600 m2 Area of ISO class 4 rooms: 140 m2 July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 15
Thank you for your kind attention July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP-II Technical Meeting 16
For this a new ISO class 4 cleanroom facility has been set up at RRCAT. Cleanroom. EP Enclosure. July 13, 2022 S.Suhane, A.Bose, S.Raghavendra, P. Shrivastava PIP -II Technical Meeting Cleanroom Facility at RRCAT. 9. CLEANROOM PARAMETERS. Parameter. Value. Cleanliness. ISO 4 and ISO 6. Air Change Rate 500 / hour .
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