Transcript European Plans for ATF2 G.A. Blair LCPAC, KEK 24th March 2006 • Overview • CERN + LAPP • EUROTeV • UK • France • DESY.

European Plans for ATF2
G.A. Blair
LCPAC, KEK
24th March 2006
• Overview
• CERN + LAPP
• EUROTeV
• UK
• France
• DESY
ATF2 EU Overview I
Item
LAL,LAPP
(France)
DESY
(Germany)
CERN
(Europe)
UK
ATF2 EU Overview II
Item
LAL,LAPP
(France)
DESY
(Germany)
CERN
(Europe)
UK
CERN
Contributions & Plans for
ATF/ATF2
•
•
•
•
contributions to ATF2 ‘studies’
hardware contributions
details of precision transformer BPMs
laser-Compton polarized e+ source
From:
Frank Zimmermann, CERN
CERN ATF-2 “Studies”
1) development of commissioning strategy;
already wrote section of design report
1 person month
2) investigation of optimum beam-based alignment procedures with pertinent specification of BPM ranges
3 person months
3) simulation of IP tuning and maximum tuning knob
ranges
4 person months
4) survey of relevant collective effects in ATF-2
and ATF extraction line; particularly wake fields
1 person month
5) participation in commissioning activities
3 person months
in total:
1 person year
approved by CSC
on 13.10.2005
CERN ATF2 Hardware I
Active stabilization table including stabilizing feet
(STACIS2000 from TMC);
• honeycomb structure with
length 2.4 m, width 0.8 m, height 0.8 m;
• absence of structural resonance below 230 Hz
• stabilizing feet are equipped with geophones, rubber pads
for passive damping, and piezo-electric movers for active
damping of load vibrations induced from the ground;
• table was used for CLIC stabilization study;
• presently on loan at Annecy;
• available from mid-2006;
• best use at ATF-2 to be identified; e.g.:
Stabilize final quadrupoles and IP monitors
value about 100,000 CHF (8.72 MYen)
CLIC test stand for vibration measurements & magnet stabilization studies
S. Redaelli, R. Assmann
CERN/LAPP Contributions
• LAPP will contribute the FD support
system for all the four final focus magnets
of QD0, SD0, QF1 and SF1 with the three
dimensional analysis of the vibration there.
• CERN provides the CLIC active table.
• LAPP is also responsible of installation of
the FD system and commissioning.
Oxford
Stabilization of Focal Point
• ATF2 program needs: Stabilization of Shintake
monitor of 10nm with respect to final focus
qudrupole.
• Require to monitor on timescales of seconds
and minutes → Laser interferometric
straightness monitor.
• StaFF group in Oxford is developing a
straightness monitor for ILC. A setup using >20
distance meters will be tested at ATF during
2006-2007, with 20-30 nm expected resolution.
Nano-BPM
Built by
SLAC group
~2m
D. Urner
Nano-BPM
Built by
KEK group
Oxford
R&D for compact Straightness Monitor
• ATF setup needed to test
– Test distance meter (under accelerator conditions).
– Combination of several measurements.
– Test of Stabilization algorithms (using BPM movers).
• Compact straightness monitor needed for ILC
– Integration into one device harder – but allows system
with much smaller vertical dimensions (few cm).
– ATF2 ideal test facility.
– Goal is to provide at least 10nm resolution (as
required by ATF2).
– Time frame 2009 anticipated.
D. Urner
CERN ATF2 Hardware II
Three precision transformer BPMs.
• Projected spatial resolution 100 nm
• Time resolution: 15 ns;
• Aperture 4 mm (available at the end of 2007)
aperture might be increased within limits
Advantages of transformer BPMs
- arbitrary bunch spacing
- large bandwidth (almost 6 decades)
- simple readout electronics
- insensitive to spray
Development cost about 160,000 CHF (13.95 MYen)
plus manpower; co-financed by EU via EUROTeV
CERN BPM Design goals
• Aperture: 4mm
• Resolution: 100nm (CMMR > 92dB)
• Absolute precision: 10μm
• Rise time: <15ns
• Dynamic range: ±1.5mm (15 bits)
• Linearity error: < 1%
• 24h stability: 1μm
• Vibrations <100nm
• Low frequency cutoff: 100kHz
• High frequency cutoff: 30MHz
• Bake out temperature: 150°C
• Operating temperature: ~20°C
• Vacuum: 10-9 Torr:
Lars Soby
Design Idea:
Starting point:
40 mm aperture BPM (CTF-3):
Aim:
4mm aperture PBPM
designed by M. Gasior,
CLIC Note 572, DIPAC 2003
Lars Soby
CERN also has great interest to participate further in a
polarized e+ source based on Compton scattering
Snowmass ILC proposal (T. Omori, J. Urakawa, E. Bulyak, P. Gladkikh, K. Moenig, …)
uses Compton ring with 30 laser-beam IPs, stacking in main damping ring;
modified scheme for CLIC benefits from smaller # bunches, smaller charge,
high repetition rate, only 1 laser-beam IP, stacking in compact pre-damping ring
yield in CLIC Compton
ring vs. turn (E. Bulyak)
ATF2 Laser-wire I
• Build on experience at ATF extraction line
• Multiple IPs for emittance measurement
• Light transport studies, looking to ILC
• Implementation of fast-scanning
mechanisms.
• Understand operational issues and input
into ILC technical design.
• Complementary programme at ATF and at
DESY to address ILC operational issues.
ATF2 Laser-wire II
new dedicated IP
Integrated BPM?
Integrated wire scanner?
Multi-dimension scans
Light delivery
Petra system
ILC/ ATF2 Diagnostics Laser
System
Laser oscillator choice:
• A conventional mode-locked Nd:YLF (1047 nm/1053nm)
• or Nd: YAG (1064 nm) laser
• or A mode-locked fiber laser (1047/1053/1064 nm)
Laser Amplifier choice:
High power diode pumped Nd:YLF or Nd:YAG
Choice on 2nd harmonic crystal : LBO/BBO (250 nm – 500 nm)
• System being investigated now (fiber laser attractive)
• Will be built this year at Oxford
• High power output will require further second stage
• Could be used for laser-wire and Shintake at ATF2?
BDSIM simulation of ATF/ATF2 beamline
• BDSIM is a Geant4-based beamlne simulation toolkit
• Used for PETRA
laser-wire (J. Carter)
• In use at ATF (L. Deacon)
• Plans for ATF2
L. Deacon (RHUL)
O. Dadoun (LAL)
(EUROTeV)
• Important to benchmark for ILC
http://flc.pp.rhul.ac.uk/bdsim.html
FONT: Intra-train Feedback
67 ns
2002
2004
54 ns
23 ns
2005
FONT4 digital
processor board
P. Burrows
France at ATF2
LAL-Orsay, LAPP-Annecy and LLR Polytechnique,
together with 8 scientists from KEK, have just sent
in a joint application (~€800k) to the newly created
ANR (Agence Nationale de la Recherche) for
project money to work on ATF-2 in the period
10/2006-9/2010. Result is expected in July 06.
Development and implementation of the beam
correction algorithms
• Beam line modeling with an optimised version of the
GEANT4 simulation
• Active stabilisation of critical mechanical support
structures for the final Focus
• Development of specific beam instrumentation
•
DESY at ATF2
• Stabilisation study for the FD system and the
site (ground motion at the ATF2 floor)
• Laserwire; interest in Compton detector and
in data taking + analysis (part of EUROTeV)
• Fast kicker to produce the ILC like bunch
structure at ATF2 in the future.
• DESY may also be interested in fabrication of
magnets.
Funding Programmes
Funded until Dec. 2007
Includes ATF/ATF2:
• CERN BPM,
• Laser-wire
• STAFF (stabilisation)
• FONT, NanoBPM
• BDSIM
Funded until Mar. 2007
Includes ATF/ATF2:
• Laser-wire
• FONT, NanoBPM
• BDSIM
SUMMARY
A very active and fruitful collaboration involving
European partners at ATF/ATF2
Plans are advanced for future participation in
Both the hardware and the running of ATF2
• BPM
• Compton source
• Laser-wire/Shintake
• Lasers
• Stabilisation
• Feedback
• Simulation/optimisation
The next funding round is starting now …