MEETING GOALS:
- to review specifications and technical choices + to set deadlines for decision on pending questions,
- to define the precise contribution of each partner (deliverables and planning) and the interactions between partners (names of persons in charge, exchange of information/hardware, planning of meetings, …),
- to propose how to demonstrate 25 MV/m (Beta=1) and 19 MV/m (Beta =0.65) before mid-2011
- to list untreated subjects and collect suggestions for addressing them,
- to organize the collaboration (Constitution?),
- to define the dates of the main meetings until end of 2009.
4 rooms are available for the 4 workings groups:
- AT auditorium
- 30-2-005
- 112-R-028
- 112-R-034
10
RF Power Distribution for SPL - Introduction
Speaker:
Edmond Ciapala(CERN)
Slides
11
RF Power Distribution = System Layout and Components
Speaker:
DANIEL VALUCH(CERN)
Slides
12
Cockroft Instutute - HP RF Expertise and Areas of Interest
Speaker:
Amos Dexter
Working Group 2 - Session 1 (with WG 4)AT Auditorium
AT Auditorium
CERN
13
On the optimum choice of the geometric beta of the sc cavities
Make recommendation on geometrical beta based on beam dynamics issues, in view of the impact on power dissipation, max. gradient, and required equipment (high pressure water rinsing, electropolishing, ...)
Speaker:
Frank Gerigk
Slides
14
Discussion on cavity beta and other design issues
Other design issues:
Optimize cavity geometry w.r.t. peak fields, multipactor, robustness against Lorentz-force detuning, tunability, HOM spectra, cross-talk between cavities (from HOM or electron propagation, ...)
Identify potential contributers and deadlines
15
Do we need HOM dampers on SC cavities in p linacs?
Speaker:
Joachim Tuckmantel(CERN)
Slides
16
HOM studies for TESLA
Speaker:
Hans-Walter Glock
Slides
17
HOM damping on sc cavities
Speaker:
Joachim Tuckmantel
Slides
18
Discussion HOM coupler
Possible issues:
- Acquire results on HOM impedances, beam instability studies, and interaction between cavities via HOM propagation
- Define strategy on HOM coupler design, prototyping and testing
- Design HOM coupler (antenna vs. beam tube absorber), and cooling layout
- Perform multipactor studies
- Identify manufacture capacities
- Identify required equipment for HOM coupler tests (do we need room temperature model cavity?)
Identify potential contributers and deadlines
Items for discussion:
- Understand limits of scope of CEA and CNRS contributions;
- Identification of integration needs: components type, interfaces, functional needs;
- Identify uncovered items and possible distribution to institutes interested
Working Group 4 - Session 1 (together with WG2)AT Auditorium
Klystron Modulators for the LP-SPL and for the HP-SPL
Speaker:
Carlos De Almeida Martins(CERN)
Slides
23
Review of Specifications and Technical Choices - Part 1
Speaker:
Edmond Ciapala(CERN)
Slides
24
Review of System Specifications and tecnical choices Pt 2
Slides
Working Group 2 - Session 2AT Auditorium
AT Auditorium
CERN
25
Processing of cavity to obtain design performance
- Define strategy to reach full performance (25 MV/m for beta = 1 cavities) for a fully equipped prototype cryomodule
- Identify required equipment (e.g. electro-polishing, HPWR) and what is missing
Identify need of re-processing and re-testing, the equipment required and what is missing
Speaker:
Pierre Maesen(CERN)
Slides
27
Discussion session
Potential manufacturers and required equipment
- Identify potential Labs with manufacturing competence (in house or with industry)
- Identify potential commercial manufacturers
- Agree on manufacturing and processing sequence
- Identify required equipment (e.g. field flatness, frequency tuning) and what equipment is missing
Diagnostic equipment
- Define required equipment (on-line: Temperature mapping and other diagnostics methods in super-fluid helium) and what is missing
- Define required equipment (off-line: Optical inspection system) and what is missing
Identify potential contributers and deadlines
- Type of coupler, integration needs, mechanical interface
- Type of tuner, integration needs, interface to cavity helium vessel
- Magnetic shielding design & integration (internal? external?)
- Alignment requirements and assembly principles
- cryogenics distribution architecture: general requirements and possible schemes, slope, H/W related issues (ex. Technical Service Modules)
- Table of Work Packages
-AOB
Discussion on addressed topics and on integration issues between WG1, 2 and 3
Power coupler:
- Define the conceptual design, the layout of cooling (including thermal loads) and diagnostical tools, choice of materials (waveguide, window)
- Perform multipactor studies, assess methods of multipactor suppression and elaborate coating techniques
- Acquire data on the secondary emission coefficient (SEC) of materials involved
- Identify manufacture and conditioning facilities
- Identify required equipment for coating and conditioning
Frequency tuner
- Perform by computer simulation Lorentz-force detuning studies of cavity design and confirm by measurement
- Develop and test slow tuner; integrate the design into that of the cryomodule
- Develop and test fast tuner; integrate the design into that of the cryomodule
- Develop scenarios for failing cavities (detuning)
Magnetic shielding
- Design by computer simulation or analytically the magnetic shielding; manufacture it
Identify potential contributers and deadlines
Working Group 3 - Session 3: Common session with WG1 and WG2112/R-034
Summary on organisation and planning of the collaboration
Speaker:
Roland garoby
Slides
WG 1: High power RF equipment (RF distribution, amplitude/phase modulators, circulators, loads…)AT Auditorium
AT Auditorium
CERN
WG 2: Cavity design (geometric beta, high power coupler, HOM damper/coupler, tuner …) and construction (Manufacturers, processing facilities, low power RF tests …)AT Auditorium
AT Auditorium
CERN
WG 3: Cryomodule and integration (Design, construction, assembly…)AT Auditorium
AT Auditorium
CERN
WG 4: Beam dynamics and loss management (Collective effects, H- stripping, collimation …)AT Auditorium