TESLA Technical Board Sept 07 2004
HEdwards
Agenda
•Review and discuss Charge
•What are plans, schedules, and wishes for cavities,
modules, TTF tests, module test facility.
VUV, XFEL, ILC
Plan for 35MV/m
•Presentations and discussionsWeiseTTF
Petersen- cavities, modules, test stand
Charge for TESLA Technical Board
Provide advice to the TESLA Collaboration
technical activities toward reaching the goals of
TTF, both for the FEL and the LC work.
Give recommendations/suggestions to
• The TESLA project leader
•The TESLA Collaboration Board
Tasks
•Review important objectives, schedules, and
priorities of upcoming TTF activities
•Provide input to the definition of technical
milestones for the next ~3 month intervals
•Review TTF progress at 3 month intervals,
identifying gaps and possible problems in the TTF
program
•Provide input to help optimize the LC and FEL
objectives
•Give summary report to the TESLA Collaboration
Board
Commissioning through Jan 05 ~5 months
From first e- beam to FEL saturation
first beam
(in undulator)
6 Sep.
2004
10 Oct.
3 months
FEL
29 Nov.
2 months
saturation
22 Jan. 2005
TTF2/VUV-FEL
Castro
Beam commissioning
•
•
•
•
•
re-commissioning of gun + injector
setup cavity phases ACC2-5 Æ beam energy
setup bunch compression
setup beam linear optics, optimize orbit
commissioning of diagnostics
FEL 30 nm
10 weeks
1 bunch
•
•
•
•
setup collimation
emittance measurements and optics matching
beam-based alignment in undulator section
commiss. of photon diag. with spon. emission
Saturation+
6-100 nm
•
•
•
commissioning of FEL diagnostics
study of FEL beam, compression schemes, etc.
establish reproducible settings, etc.
3 weeks
8 weeks
1st beam
(bypass)
Castro
2005 Goals
Saturation in wavelength range 30-120 nm
July 2005
User operation (extended period)
Operation with long bunch train
User operation (extended period)
How much user operation?
How much acc development and studies?
TTF and Beam operation all year
Dec. 2005
Does this mean Approximately 2 user runs
one before July
one after July
First Do a mix of
acc module tests
acc & photon studies,diag
FEL studies
2005 Goals How does this work with sat 6-100nm in Jan?
Saturation in wavelength range 30-120 nm
July 2005
User operation (extended period)
Operation with long bunch train
User operation (extended period)
Dec. 2005
Weise
Schedule looks like being FEL dominated. Is this true?
For 2005 we assume
9 weeks of FEL user operation
2 months FEL studies
2 months accelerator studies (diagn. etc.)
includes photon diagnostics
2 months of dedicated acc.module tests
This means: 4 months to be discussed
A studies list is being developed
Examples of basic studies and tests
Hi Power processing and
Darkcurrent
Module gradient operation & cryogenics
LLRF tests
Weise
A must:
- HPP of the relevant cavities M5/C6, M1/C8(?). Others ???
- long time operation of M5 at high gradients in steps from 20
MV/m to 25+MV/m:
- what are the typical problems?
- any change in dark current?
- how close can we go to the gradient limit?
-processing behaviour after interruptions / shut down
important:
- repeat test of all cavities
detuning of individual cavities
compare rf calibration with beam
- cryo losses vs. operation time
- check cavity alignment with beam
nice to have:
- Lorentz-force detuning of the individual cavities
- long beam pulse in M1/C5 at 35 MV/m
- optimized piezo compensation M1/C5
- RF-distribution optimzed with respect to maximum
gradient
LLRF In General
- develop robust algorithm for Lorentz force compensation and test with
piezo tuners at M6 and M1/C5.
- failure recogination and exception handling, esp.close to performance
limit
- measurement and optimization of amplitude and phase stability
(within bunch train, from train to train, long time)
- automized operation (FSM) of LLRF
- test next generation of LLRF (developed for XFEL: increased ampl. and
phase stability requirements)
- beam based feedback algorithms (energy, phase, bunch length)
More specific... (with beam)
o measure field stability with beam
o adaptive feedforward (RF only and for beam energy)
o exception handling (quench, operation close to the limit)
o calibration of gradien and phase
o single bunch transient detection
o phase drift betwenn RF and beam
o beam phase with respect to RF phases
o study EMI/EMC (down converter) / reduce noise
o crosstalk between RF systems
o test new FPGA based feedback at the RF Gun.
o test new FPGA based Feedback at ACC1
o develop new control algorithms
o test LLRF FSM with beam
More specific... (without beam)
o LO optimization for downconverter
o check M.O. level and frequency distribution
o measure phase stability of frequency distribution system
o upgrade of downconverter
o remote control of attenuators (probe, forward / reflected power cables)
Summary
Weise
Do we have to re-consider the amount of beam time for
ILC related issues?
The amount should be ok, but we should make a detailed
planning in order to include all interested colleagues.
Almost all above listed points are of equal importance for the
three projects VUV-FEL, XFEL, and ILC.
Just very few points are ILC specific.
We are expecting many months of operation as a test for the
long time behaviour of our systems.
Comments
More detailed and organized study plans and
schedules will be developed by the next meeting. By
that time there will be information on just how well
commissioning is going.
Study programs should be further developed and
new ones considered. Collaborators encouraged to
join in and take on responsibilities.
Board agrees with Hans that most important is to
get to stable long term beam operations. One can
then build on that.
Cavity Report Summary
(from Petersen)
• EP working well now
• 35MV cavity module - model for schedule
planning
–
–
–
–
Use new Zanon cavity production
Assume no 1400C
Chechia tests
Assume 1of 2 cavities successful
• Production and test of new Zanon cavities
going slowly
Cavity preparation
general comments
After several technical problems: EP is working now reliably
General assumptions for schedules:
no 1400 C treatment of new cavities
Requirement for next modules: 35 MV/m for each cavity
Assumption for the schedules: Each second cavity will reach
35 MV/m ( this is also assumed for retreated cavities) with
reference to latest experience
CHECHIA test for each cavity
Modul 6 needs cavities out of the new ZANON production
Not yet considered in the schedules:
Clean room will need 3 weeks of maintenance/repair in the next
months
Petersen
Next cryomodules
Modul 6 : ‚high gradient module‘, all cavities 35 MV/m, type III
design:
Ready : May 2005 (plus 1 month) optimistic
Modul 7: ‚ linac spare module‘, type II design
TESLA meeting at ZEUTHEN -> all cavities EP treated, 35 MV/m (NOT
Required)
Helium vessel of type II have to be produced !!! -> decision needed
(type II cavities& vessels available, flanges have to be exchanged)
Stick with plan to use Zanon cavities
Ready : December 2005 (plus 1 month)
Module Summary
Module 6 35MV (type III) optimistic June 05
needs piezos, no BPM
Module 7 spare (type II) ( 35MV not required but
want to use new cavities and EP to gain
statistics)
needs Type II helium vessels
Dec 05, Jan06
Module test stand commissioning Nov 05
Want to test module 6 in test stand before
installation in TTF
Module 8 and beyond need many components
like cold mass
Need to immediately take action on piezos and
Helium vessels
Cryomodule parts (cont.)
modules beyond 6 &7
modules
cavities
Cold
mass
+ vvessel
tuners
magnets
Hevessels
Total
Availabl
e now
30
1 type II
1 type
III
17
2 TTF
1 TESLA
20 type
III
6
7
Old?
8
9
2
Sstruct
BPM
40
piezos
?
piezos
8 II ?
XFEL
Type ?
4
XFEL-type
8
?
Main Couplers
Comments
Need to take action on missing parts for Modules 6, 7
Need to have a plan for proceeding on Modules 8 -> and
their planned destination assignment by next collaboration
meeting.
It appears that any new module installation into TTF will
not take place before 2006, both because of preparing
and testing the high gradient modules before installation
and because of the study program at TTF
End ThankYou
Schedule until 2007
Saturation in wavelength range 30-120 nm
July 2005
User operation (extended period)
Operation with long bunch train
Dec. 2005
User operation (extended period)
3rd Harmonic RF system and ACC6 installed
Feb. 2006
1 GeV beam energy
April 2006
Saturation 6 nm
June 2006
User operation (extended period)
Seeding Option installed
Dec. 2006
Seeding demonstration
April 2007