1. XFEL Vacuum System Commissioning
Lutz Lilje
Workgroup RF Operation

2. Distinction: Installation - Commissioning
Installation Phase
Goals
Ensure vacuum system integrity
Leak searches
Crosscheck of individual components
Ensure
Personal safety e.g. emergency off
Technical safety e.g. technical interlocks
Requirement for all vacuum systems
Basic Ethernet access to components
Pump stands to be monitored

3. Distinction: Installation - Commissioning
Commissioning phase
Goals
Full system checks
Monitoring of all vacuum sensors in control system
Beam line valves
Crosscheck of the PLC e.g. interface to BIS/MPS
Isolation vacuum valves
Machine commissioning
RF operation
Cryo operation
Requirement for all vacuum systems
Full operation of the control system in vacuum terms

4. Installation Requirements: Cold Linac Beam-line Vacuum System
Mounting of the BLAs
Leak check
Opening cold manual gate valves
Static vacuum
Manually lock valves in SCBs (string connection boxes)
Installation of the cables to the racks
Setup of
emergency-off
technical interlocks
System tests
TSP and Sputter ion pump operation

5. Installation Requirements: Warm Linac Beam-line Vacuum System
System alignment
Assembly and leak checks
Commissioning of special components
Collimators
Beam stops
Dump vacuum system
System tests
TSP and Sputter ion pump operation

6. Installation Requirements: Coupler Vacuum System
Mounting of the system
Most being done at AMTF
Leak check
Option: Really needed? Only crosscheck after transport.
Static vacuum
Option:
Fire TSPs
Start sputter ion pumps when network is available
Need control system
Installation of the cables to the racks
Setup of the technical interlocks
Setup of
emergency-off
technical interlocks
System tests
TSP and Sputter ion pump operation

7. Installation Requirements: Isolation Vacuum System
Close interaction with cryogenics
Leak searches of helium process tubes potentially disturb other leak searches
Helium ‚flooding‘ the tunnel
Leak searches of the module connections
Modules checked at AMTF
String connection boxes to be clarified
If a string (or a single RF station) is operated the system would need to be evacuated
To my knowledge no experience with processing with the module iso-vac vented
Systems test
Before first cool-down
Full check of Iso-Vac-Valve-Control

8. Vacuum Commissioning Requirements
Operation of the control system
No operation of the HV of the sputter ion pumps without control and emergency-off
Technical interlock operational
Vacuum signals (sputter ion pumps) required
RF operation on RF units
TSPs required
Cryo operation
Full system check
Valve control isolation vacuum
Valve control beam vacuum
Maybe a proper segmentation allows partial commissioning (also needed for the injector)
Beam operation
Valve controls
BIS / MPS
Collimator operation …

9. Interfaces to other systems (to be completed…)
(Alignment)
During installation
Personal interlock
Concept for the beam stops
Emergency off for getter pumps
also laser transport vacuum in injector
Exception: Cathode system (analog to FLASH if required)
Contacts needed in RF Racks for the cold linac or Vacuum racks in the undulator section
Pumpstands (Iso-vac) probably not in emergency off (seperate discussion)
Technical interlock for the RF stations
Pressure readings for conditioning and operation
BIS/MPS
Pre-selection of which modes can be operated from a vacuum point of view e.g. which undulator section is pumped-down, injector-only etc.
Beam-loss monitoring to guarantee safety of the vacuum system
Controls
Monitoring of installation hardware
Operation of the vacuum system
Cryo
Isolation vacuum system
Installation partially done together
Photon beam systems
Concept on how to operate V0