European Plans for ATF2G.A. Blair

LCPAC, KEK24th March 2006

• Overview• CERN + LAPP• EUROTeV• UK • France• DESY

Item LAL,LAPP

(France)

DESY

(Germany)

CERN

(Europe)

UK ATF2 EU Overview I

Item LAL,LAPP

(France)

DESY

(Germany)

CERN

(Europe)

UK

ATF2 EU Overview II

CERNContributions & Plans for

ATF/ATF2

From:Frank Zimmermann, CERN

• contributions to ATF2 ‘studies’• hardware contributions• details of precision transformer BPMs• laser-Compton polarized e+ source

CERN ATF-2 “Studies”1) development of commissioning strategy;

already wrote section of design report

2) investigation of optimum beam-based alignment pro-cedures with pertinent specification of BPM ranges

3) simulation of IP tuning and maximum tuning knobranges

4) survey of relevant collective effects in ATF-2and ATF extraction line; particularly wake fields

5) participation in commissioning activities

1 person month

3 person months

3 person months

4 person months

1 person month in total:1 person yearapproved by CSCon 13.10.2005

CERN ATF2 Hardware IActive 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 monitorsvalue about 100,000 CHF (8.72 MYen)

CLIC test stand for vibration measurements & magnet stabilization studies

S. Redaelli, R. Assmann

• 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.

CERN/LAPP Contributions

Stabilization of Focal Point

Nano-BPM Built by SLAC group

Nano-BPMBuilt byKEK group

~2m

• 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.

Oxford

D. Urner

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.

Oxford

D. Urner

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

CERN ATF2 Hardware II

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

• 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

CERN BPM Design goals

Starting point:40 mm aperture BPM (CTF-3):                                                                                                                                                         

Aim:                               4mm aperture PBPM   Lars Soby

Design Idea:

designed by M. Gasior,CLIC Note 572, DIPAC 2003

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 Comptonring 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 IPIntegrated BPM?Integrated wire scanner?

Multi-dimension scansLight deliveryPetra 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

67 ns

54 ns

23 ns

2002

2004

2005

FONT: Intra-train Feedback

P. BurrowsFONT4 digital

processor board

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 ProgrammesFunded until Dec. 2007Includes ATF/ATF2: • CERN BPM,• Laser-wire• STAFF (stabilisation)• FONT, NanoBPM• BDSIM

Funded until Mar. 2007Includes ATF/ATF2: • Laser-wire• FONT, NanoBPM• BDSIM

SUMMARYA very active and fruitful collaboration involvingEuropean partners at ATF/ATF2

Plans are advanced for future participation inBoth 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 …