erlp commissioning naomi wyles astec stfc daresbury laboratory
TRANSCRIPT
ERLP Commissioning
Naomi Wyles
ASTeC
STFC Daresbury Laboratory
Overview of ERLP
Electron Gun
DC Photocathode Electron Gun
First electrons obtained in August 2006
Achievements so far
Both super conducting linac modules cooled to 2K
Synchronisation of RF and photo-injector drive laser
High power RF tests for linac module
Commissioning of terawatt laser for Compton back scattering and electro-optic bunch length diagnostic
Overview of ERLP
Gun Power Supply
Gun
Super Conducting Booster
1st (outward) Arc
2nd (return) Arc
Transfer Line
Energy Recovery Linac
Beam Dump
Commissioning Tasks
Construction of ERLP is not yet complete Commissioning has taken place in the following areas
Photoinjector laser system This was installed and commissioned prior to the gun being ready Further enhancements made after the first phase of gun
commissioning The electron gun is currently beaming into a dedicated diagnostic
beamline All radiation control systems complete
Cryogenic system has been commissioned to 2K Usually possible in parallel with construction work
RF System Buncher cavity, transverse deflecting cavity and main SC
accelerating modules are all being commissioned at present
Planning the commissioning
The electron gun is being commissioned using a dedicated diagnostic beamline Dedicated diagnostics include horizontal and vertical slits, YAG
screens, transverse deflecting cavity and an energy analyser magnet This will be removed when gun commissioning is complete
At the same time the remainder of ERLP is being constructed Lead time for the delivery of the SC linac modules was significantly
longer than anything else Problems with building and commissioning the gun
Problems in achieving XHV braze between gun ceramic and metal flanges lead to delays in gun construction
Additional problems while operating the gun led to serious delays in gun commissioning
Gun commissioning is now on the critical path Construction programme is running well
Commissioning and construction conflicts (health and safety)
Construction and commissioning have to be separated in time Construction during office hours Commissioning overnight and at weekends
This pattern means work has to be carefully controlled to avoid any conflicts Permit to Work (PtW) system (already used at Daresbury in other
areas so staff are familiar with it) Includes a Risk Assessment and a Written System of Work Not practical to cancel every permit before every commissioning shift Handover procedure has been developed
Handover procedure
ERLP has a site manager who will know what work is going on and what permits are outstanding
The handover manager is responsible for the handover procedure being followed correctly
A handover sheet must be completed Handover procedure
The site manager checks that there are no outstanding PtWs that prevent commissioning
The site and handover managers tour the accelerator area checking for people and making notes of hazards
The site manager then issues a PtW for the commissioning and releases the keys for machine operation
The Key commissioning team member then reads and signs the handover sheet
The handover sheet and PtW are kept on display and must be read by subsequent Key Commissioning team members
The handover sheet also specifies what must be done to return from commissioning to construction
Handover Sheet
Commissioning and construction conflicts (staff availability)
Most staff do not work on ERLP full time
Commissioning team are mainly accelerator physicists and technologists who work on other projects as well
Construction team are also involved in other projects, particularly the SRS which has a schedule written many months in advance
The running of the SRS has to take priority over ERLP because it is a user facility
Scheduling and Shifts
Commissioning uses a 3 shift system Shift1 – 00:00 – 08:00 Shift 2 – 08:00 – 16:00 Shift 3 – 16:00 – 00:00
Weekdays only shifts 1 and 3; construction in shift 2
Weekends/Holidays all 3 shifts used
Flexibility about when construction ends
Staff work shifts on a casual basis – average of 1 per week
Availability collected (which is expected to be ‘reasonable’) on an Excel spreadsheet
Roster produced based on this Macro sends Outlook
appointments No problems due to large pool of
people Smaller pool of people would
require fixed shifts
Commissioning team
Every beam commissioning shift requires 2 people One must be a member of the ‘Key Commissioning Team’
Responsible for leading technical work Responsible for personnel and machine safety
Key Commissioning team members only devote 30% of their time to commissioning
They undertake additional training Laser safety General Health and Safety
Second team member does not have such a large commitment to the project They are expected to be interested and enthusiastic
Training
All personnel who wish to enter the ERLP accelerator areas must have undertaken basic radiation safety training (or be accompanied at all times by someone who has)
Enforced by access control system using ID badges Commissioning team have additional training in the Personnel Safety
System Includes how to carry out a search If there was a radiation incident the SRS crew would be called and
are responsible for implementing action Key commissioning team have additional training
4 day health and safety course which is being rolled out to everyone with management or project responsibilities
Laser training – enables them to switch the laser on and off thus not requiring a laser specialist to be present at all times
Documentation
ERLP Safety Handbook Issued to all key commissioning team members and other relevant
staff Covers how safety is organised Lists those with specific safety responsibilities and what those
responsibilities are Details procedures for carrying out all kinds of work Content is presented during basic safety training
Local rules All commissioning team members must be familiar with these
Documentation ELOG
Log for recording work in shifts Fault reporting system which automatically e-mails relevant specialist ERLP Manual ERLP Manual is slowly being replaced by a Wiki-style manual This records and saves all versions Web based so can be accessed off site
Project plan This is live and enables people to see when the next commissioning
period will begin During commissioning there is a much more detailed shift by shift
plan Fine detail only added near the time
Reports These are written after the work is discussed at a weekly meeting
Communication
Meetings are held on a regular basis During construction daily meeting at 09:00 to discuss day’s work and
any conflicts with commissioning A weekly planning meeting is also held for construction issues During commissioning a daily meeting is held at 16:00 to discuss the
next 24 hours commissioning All commissioning team members who have been on shift in the last
24 hours or who are due on shift in the next 24 hours are expected to attend (except the night shift)
Weekly commissioning review takes place attended by all key commissioning team members and as many others as possible. Discusses previous week’s work and identifies reports to be written. Plans the next week’s work.
Conclusion
Successful method of simultaneous construction and commissioning Satisfies Health and Safety requirements Significant progress has been made in spite of technical difficulties
Useful Links
http://projects.astec.ac.uk/ERLPManual/index.php/Main_Page https://srdweb5.dl.ac.uk/erlp/elog/