1. Mathieu, Gabriel, Max, Spyros, Guillaume
LHC SPARE CAVITY
RF TEST PREPARATION
Mathieu, Gabriel, Max, Spyros, Guillaume
01/11/2016
Mathieu Therasse

2. CAVITY PREPARATION FOR RINSING BEFORE COATING
½ Day, 2 persons
Preparation
Plates mouting
PE flanges mounting
Installation on the coating support
Clearoom preparation
Cane mounting
Instrumentation connection
01/11/2016
Mathieu Therasse

3. CAVITY PREPARATION FOR RINSING BEFORE COATING
Particle counter
Measurement done before the rinsing cane
TOC and Resistivity
Measurement done before and after the the rinsing cane
Pupw = 3 bars
During ≈1h
Alcohol 5 bars, 20L
Drying ≈2h
Improvement to be schedule:
Water parameters measurement after the cane filter (TOC, R, Particles)
Water parameters measurement after the cavity (TOC, R, Particles)
Water pressure increase
01/11/2016
Mathieu Therasse

4. RINSING BEFORE COATING
PC1
PC2
01/11/2016
Mathieu Therasse

5. CAVITY PREPARATION FOR RINSING AFTER COATING
1 Day, 2 persons
Preparation:
Flanges degreased (bldg 102)
Flanges mounting
RF Antennas: input 53.5 mm (7/16 feedthrough) and 2x output 34 mm (N Type)
Top: transition CF300 to CF100 and the rinsing cane
Bottom: «cone» use to collect the water and for pumping
Intrumentation mounting
Improvement to be schedule:
Installation of a new electrical Crane in the cleanroom and adapted to lift heavy load
Automatized rinsing system
01/11/2016
Mathieu Therasse

6. RINSING PROCESS 2 hours, 2 persons Setup Parameters
Cane fixed to the crane
0.2 m filtered Water on the cane top
0.2 m filtered N2 gas
Water station: TOC and particle measurement (inlet)
Water resistivity measurement (oulet)
Parameters
Rinsing pressure: 4 bars max
Inlet water:
TOC= 4-5 ppb
R= 18.2 M.cm
Particle: 0.1 um, 0.2 um
Outlet water:
Resistivity measurement: R>12.5 M.cm after 3 min (after rinsing)
Improvement to be schedule:
Water parameters measurement after the cane filter (TOC, R, Particles)
Water parameters measurement after the cavity (TOC, R, Particles)
The rinsing machine is not adapted for high pressure rinsing
01/11/2016
Mathieu Therasse

7. PC1 AND PC2 RINSING AFTER COATING
UPW station parameters
UPW station parameters
UPW parameters after filter
(old filter)
Measurement process error
01/11/2016
Mathieu Therasse

8. CAVITY DRYING AND PUMPING
½ Day, 2 persons
Heater bands installation
Filtered N2 gas (0.2 m, bottle) during pumping
Pumping with liquid N2
Heating procedure
Improvement to be schedule:
Renew the bake out equipment (heater rack controller, heater bands)
Vacuum at the end (with a primary pump):
PC1: P=3x10-1 mbar
PC2: P=3.4x10-1 mbar
01/11/2016
Mathieu Therasse

9. CAVITY CLOSURE ½ Day, 2 persons The closure is done in ISO 5 Baldaquin
Heater equipement removing
Cavity and Baldaquin cleaning
«cone» removing
CF300 copper plated mounting
Cavity transport to SM18 for the RF test preparation
01/11/2016
Mathieu Therasse

10. CAVITY MOUNTING ON THE RF TEST STAND IN SM18
1.5 Day, 2 persons
Cavity connection to the insert pumping line
Critical operation
The area around the connection is cleaned (cleanroom standard process)
Connection done in front of a laminar flow
The cavity arrives in SM18 at P=1000mbar
Cavity installation on the insert
Improvement to be schedule:
New mobile soft wall clean room (end of november 2016)
01/11/2016
Mathieu Therasse

11. CAVITY MOUNTING ON THE RF TEST STAND IN SM18
Slow pumping with a mobile pumping unit
- Rinsing of the pumping connection 3x with flitered N2 gas (0.2 m) before cavity valve opening
Membrane primary pump (3m3/h)
Turbo pumping at 0.1 mbar
Ionic pumping at 10-6 mbar
Leak detection
3 hours+1 night, 1 person
Leak rate: mbar l/s
He gas
01/11/2016
Mathieu Therasse

12. CAVITY MOUNTING ON THE RF TEST STAND IN SM18
PC1 and PC2 leak detection
PC1
PC2
First RF test
First RF test
Leak on a CF100: 10-7 mbar l/s
Changing with a laminar flow
Ionic pump equipped with a main valve changing
Leak detection: 10-9 mbar l/s
Final leak detection: 9.5x10-10 mbar l/s
Second RF test
CF300 changing stain steel to copper plated
Leak detection: 9x10-10 mbar l/s
Rmk: Small leak on the ionic pump main valve
01/11/2016
Mathieu Therasse

13. CAVITY MOUNTING ON THE RF TEST STAND IN SM18
½ Day, 2 persons
Instrumentation mounting and testing
- Safety valve 0.8 and 1 bar
- Burst disk 2.5bars
- PT 0-4 Bars
- 6x TT cernox
- 3x LT 1150 mm
- 4 x Thermocouples
- Heaters:
- Heaters 2x 1kW (50Ω)
- evaporator 500W (100 Ω)
Improvement to be schedule:
Add TT sensors on the cavity (top and bottom)
Cryo control has to be finalized (process, heaters) (SM18 cryo shutdown)
01/11/2016
Mathieu Therasse

14. CAVITY MOUNTING ON THE RF TEST STAND IN SM18
Cryostat Preparation
½ Day, 2 persons
Rmq:
Insert support has to be validated by HSE
Sensitive manipulation
Cryo process
Purge (1 night)
Cooldown (1 day)
Operation
- 4.5K, P≈1.3bars
- 2k, P ≈ 16 mbars (1 day)
01/11/2016
Mathieu Therasse