FEL PERFORMANCE
PROGRAM IN 2016
January 2016
BACKGROUND
The FEL Performance Program started in the January 2014
Goal: “Make the best use of non-user time to improve the performance and
capability of the machine.”
. . . User Beams
Maintenance
Development
Setup
PAMM, urgent
problems, BBA
e-,
x-ray,
prepare configs
instrument checkout
~25%
~50%
~25%
Non-user time 2/7 of total
User Beams. .
FUNCTIONAL ORGANIZATION
Performance Program
Management
H. Loos, J. Welch, W. White
Quality
H. Loos,
Capability
Z. Huang
Stability
T. Maxwell/F.J Decker
Reproducibility
R. Iverson/W.
Colocho
Photon
M. Minitti
Scheduling and
Coordination
J. Turner
5 Program functions are chosen to
cover all aspects of the beam the
users receive
• Scheduling deals with the real-world
complications
• Management keeps system going
and helps provide transparency
• Good cross-over between photon
and electron work.
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HOW IT WORKS
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Each Program has a clear Objective and Scope defined in a synopsis.
•
User Run Schedule is made by LCLS and sets the user and non-user
time.
•
Overall % allocation of development time for each program is assigned
by Performance Program Managers at beginning of user run.
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Program Leads decide priorities within their program, plan and
organize studies, and make sure analysis is done and reported.
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Individual studies are scheduled each week using the % allocations.
SCHEDULING AND
COORDINATION
Once per run
Run Schedule Set
Includes coordination with Linac
& FEL Division
Once per run
Program time is
allocated
To match LCLS needs as best as
possible.
Continuously
Program leaders
prioritize studies
Many more studies are proposed
than there is time for.
Final schedule set
Monday afternoon
Thursday MD meeting and
FEL R&D meeting
Studies are scheduled
Resolves conflicts
PAMM/POMM, instrument setup, undulator
swaps, laser work, maintenance work, user
configs, remedial tuning needs
Results analyzed and
discussed
Input from broad community including users,
instrument scientists and operators
PROGRAM PERFORMANCE
•
Pulse energy is somewhat higher
•
New capabilities introduced
•
Quicker energy changes / tune ups? Don’t have data to support claim
•
Still need extensive tune-up on saved configurations
•
Still have too much jitter
•
Poor reproducibility and long start-up times after downs
•
Photon operations seems smoother?
Quality
Hard
Soft
4
Counts (#)
Reproducibility
Soft X−Ray Reproducibility: 66.2 ± 40.6 (%)
3
2
1
0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
Hard X−Ray Reproducibility: 79.8 ± 16.8 (%)
Fall 2015
Counts (#)
4
3
2
1
0
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
Pulse Energy / SCORE expected value
measured within 60 minutes of load
1.2
1.3
Soft X−Ray Reproducibility: 79.0 ± 33.9 (%)
Counts (#)
20
15
10
5
0
0
Fall 2013
0.5
1
1.5
Hard X−Ray Reproducibility: 70.6 ± 35.7 (%)
Counts (#)
30
20
10
0
0
0.5
1
Pulse Energy / SCORE expected value
measured within 60 minutes of load
1.5
ACTUAL ALLOCATION
Overall
since 11/12/13
Run 12
AS OF 1/5/16
OLD ISSUES
•
Maintenance time is too large
•
Need feedback on program balance.
Rebalance from 40% Capability, 20% Quality, 10% Reproducibility, 10% Stability, 20% Photon?
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Program goals are out of date
NEW ISSUES
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Efficiency improvement needed
•
Management and priority decisions are needed for
•
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Transfer to operations of new capabilities
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Special setups
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LCLS-II studies.
No Henrik
LOOKING FORWARD
•
I will take over Henrik’s role as program
leader Beam Quality
•
Try to re-establish target 25/50/25 split for
Maintenance/Development/Setup
•
Deal with the new issues
RUN 10 PROGRAM GOALS EXAMPLE
Quality
“Restoring machine setup following stopper disaster. Implementing different new operation modes: self seeding,
two-color split bunch.”
Capability
Stability
Commission Delta
Commission multi-bunch
Evaluation of harmonic lasing and associated studies (slice energy spread).
Further development of SXRSS capabilities
Evaluation of taper performance in SXRSS, HXRSS, SASE, iSASE.
Reach selenium edge 12.6 keV
Recover from L1S modulator changes. Attain rho/2 energy stability.
Reproducibility
Photon
•
•
•
•
•
•
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Concentrate on reproducibility of the source: laser and cathode.
Expectations for progress in calendar year 2014 include:
▪
Characterization of beam sharing operating conditions in self-seeded mode (single and double lines)
▪
Commissioning of the FEE variable energy spectrometer
▪
Commissioning of the new standardized LCLS time tools
▪
Testing and characterization of the DESY polarization analyzer
NEXT WEEK
•
Bring in and discuss updated goals for run12 and
run 13
•
Be prepared to discuss how to manage Transfer to
Operation work.
EFFICIENCY IMPROVEMENT
•
There are about 24 months of delivering beam before
we start commissioning LCLS-II.
•
Accelerator operations budget will go down ~30%
during that time and then go back up with LCLS-II is
running.
•
We will need to become more efficient, particularly in
the next six months to one year time frame.
EFFICIENCY IDEAS FROM OPS
Management
1. operators doing work outside of daily operation - need to add management (working on that)
mainly using project driven priorities, who are the customers?
Hardware: priority is very roughly in order of list
1. motion control is really painful except undulator
2. laser cathode profile reproducibility
3. laser motion control system is unreliable: steering and feedbacks, hysteresis, home is lost, resolution is poor for needs
4. ability to recover from klystron cycles: feedback go wild, 6x6 is dumb
5. klystron reliability / trip rate
6. modulator upgrade fallout
7. weak steering software: LTU feedback and steering, jitter, dispersion correction is lost
8. LLRF is not too bad according to Stanek - failure modes are difficult to detect
9. timing system is ok: laser timing / phase timing; some new improvement is well liked: frisch and justin
10. dispersion correction is poor. routines don’t converge and don’t cover many areas of the beamline
11. Lutman setups are too hard
12. need more one button push stuff
13. flow charts for special setups would be helpful
14. changing matrices when changing energies should be automatic: no hooks for model
15. MPS just trips instead of rate recovery, some project is going but it taking years
16. phase error masked by feedback corrections
EFFICIENCY IDEAS
•
flat-topping
•
auto-tuning
•
mission readiness programs
•
reproducible source: laser spot: beam shaping, single mode
•
laser temporal profile? what is reproducible?
TRANSFER TO OPERATIONS
•
New capabilities are proven within the Capabilities program, but
commissioning them and making them routinely available for users
has become an increasingly large fraction of the non-user time.
•
Process and responsibilities are not well defined.
•
AOS needs to say when they have sufficient tools and training.
•
L&FEL and new capabilities experts should provide the tools and
training.
New Capability Proven
LFEL staff and experts, using MD
time, demonstrate the new
capability
Commissioning
LFEL staff and experts work with
AOS staff to develop tools and
provide operator training
Transfer to Operations
AOS records it is ready to provide
the new capability without requiring
LFEL staff and experts
Delivery to Users
AOS delivers the beam to users
SPECIAL SETUPS
•
Some users are getting special setups that take 12 hrs of “non-user
time” where normal users get 2. For example
•
2-bunch Delta on1/11/16,
•
2-bunch 2-color on 1/20/16
•
Is it fair to other users?
•
Is it given the right priority for this time?
•
Is the priority process transparent?
LCLS-II STUDIES
Examples
1. Radiation hardness of coated and uncoated CVD diamond
2. Argon fluorescence
3. Plasma effects on gas detectors and attenuators
4. CVD diamond attenuator speckle measurement
5. Diamond fluorescence tests
Do we want to track them separately?
What priority should they be given?
WHAT’S GOING ON
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Tim Maxwell is working on the jitter problem!
Various people are doing machine studies for new capabilities.
Yuantao and others are understanding the details of the final phase space that generate good performance
Rick is making hardware improvements to the LTU
Juhao and others are working on find a magic taper
Feng Zhou is constantly retuning the injector
Daniel Ratner is trying to improve the initial phase space with cathode shaping R&D
FJ Decker is solving the latest crises
J. Turner is solving the latest crises
J. Welch is pontificating
A. Lutman is making GUIs for hard to use software
Chao is getting his feet wet
HD Nuhn is keeping the undulators going
W. Colocho is collating information
Henrik is leaving
• Dorian Bohler is GUI-ing
• Alan Fisher is playing with detectors
• P. Krejcik is …
• Jacek Kryzwinski is …
• Tonee is…
John Sheppard is …
Mike Sullivan is keeping up with the users
Axel Brachmann is managing up and managing down to 26 regular employees. only 26 reporting. Everything else is functional.
WEBSITES
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https://portal.slac.stanford.edu/sites/lclscore_public/Pages/FEL-Performance-Programs.aspx