CLIC Instrumentation From CDR to TDR

• Conceptual Design Report

• Baseline solutions

• Alternative scenario(s)

• Next phase of R&D

• Perspectives & Conclusions

• Conceptual Design Report

• Baseline solutions

• Alternative scenario(s)

• Next phase of R&D

• Perspectives & Conclusions

1IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

• R&D on Critical issues: known since long time already50nm (3nm in BDS) resolution BPM – 20fs resolution bunch length monitor – 1um resolution transverse profile monitor

• Conceptual Design Report• Collect requirements for the whole CLIC complex (started in 2008)

• 200kms of beam line, more than 100000 instruments

• Defines CLIC baseline instrumentation with appropriate technology choice

• Propose alternative solutions which would impact either on cost or performance

Next phase• Look for standardization and technological developments for cost reduction and/or an improved reliability and maintenance

BI Chapter (70 pages )is completed now !Many Thanks to the all of the 26 co-authors,

mainly from collaborating institutes

2IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

What‘s in the CDR

What‘s in the CDR

MB Instruments Surface Tunnel Total

Intensity 86 98 184

Position 1539 5648 7187

Beam Size 34 114 148

Energy 19 54 73

Energy Spread 19 4 23

Bunch Length 17 58 75

Beam Loss 1936 5854 7790

Beam Polarization 11 6 17

Tune 6 0 6

Luminosity 2 2

DB Instruments Surface Tunnel Total

Intensity 38 240 278

Position 1834 44220 46054

Beam Size 32 768 800

Energy 18 192 210

Energy Spread 18 192 210

Bunch Length 24 288 312

Beam Loss 1730 44220 45950

3IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Beam Position Monitors - Baseline

High accuracy (5um) resolution (50nm) BPM in Main Linac and BDS

Various range of beam pipe diameters from 4mm to 200mm all over

the complex (to minimize resistive wakefield effects)

4IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Very high numbers of BPMs for the DB decelerator, together with high accuracy

Beam Position Monitors - Baseline50nm resolution low Q (~300) cavity BPM for the Main Beam

Striplines BPM for the CLIC decelerator •High current 100A – high bunch frequency 12GHz•In the vicinity of an RF strucutre producing 100MW @12GHz• Temporal resolution of 10ns• 2 micron resolution over an aperture of 23mm (accurate calibration)• Transverse mode damped by SiC absorber

5IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Proto types of

both ordered

Beam Position Monitors - TDR

• Main Beam cavity BPM – design Collaboration with & • Simulation of wake field and interference due to the presence of high field in the accelerating structure • Demonstrate high resolution and high bandwidth

• Prototype under-construction: Cavity BPM and its read-out electronic • Test at CTF3 in CLIC module in Two-beam Test stand• Demonstration of high spatial resolution @CTF3 and ATF2.• Look for cost optimization.

• Striplines BPM for CLIC Drive Beam decelerator, design S. Smith • Integration of Strip line BPM in the CLIC module layout• Prototype(s) to be tested on the Test Beam Line at CTF3•Test of module acquisition system with BPMs developed by LAPP.

• Look for industrialization and cost optimization.

• Synergies with Strip lines BPM designed for IP feedback with Oxford university

Phil Burrows on ‘IP Feedback : FONT Status’, Wednesday at 15h50

Stewart Boogert on ‘Cavity BPM system at ATF2’, Wednesday at 15h00

S. Vilalte on ‘Acquisition systems for CLIC modules’, Today at 11h

S. Vilalte on ‘Acquisition systems for CLIC modules’, Today at 11h

6IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Transverse Profile Monitors - Baseline

Critical issue on micron resolution beam profile

measurements (> 100 monitors)

Relatively big number of

Instruments ~ 1000

Imaging of high energy spread beams

at the end of the decelerator

Charge density limitation

problems in many places /

Strong need for non-

interceptive devices : two

systems required to cover the

total intensity range

The thermal limit for ‘best’ material (C, Be, SiC) is 106 nC/cm2

7IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Transverse Profile Monitors - Baseline

Most of the systems based on the combined use of OTR screens and Laser Wire Scanners- OTR used almost everywhere for commissioning (replaced by synchrotron radiation in rings) - LWS 1um resolution required for the Main beam- LWS used in the Drive Beam injector complex for high charge beams

Non-interceptive monitor based on Diffraction radiation as a cheap alternative to LWS for both Drive and Main Beams

8IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Transverse Profile Monitors - TDR

• Optical Transition Radiation • Simple technology known for more than 30 years in beam imaging technique

• Still R&D to understand and push their performances• Pushing the spatial resolution to the limit• Imaging of large or very large beam size (Spectrometer and Dump lines)• Imaging of high energy spread beams in the Drive Beam Decelerator

• Laser Wire Scanner• Design and implementation of LWS in the CLIC Complex

• LWS for the Drive Beam: (2.4GeV) – 5-10um resolution – cost optimization• LWS at very high energy (above 10GeV, the Compton cross-section drops: 90% reduction at 1.5TeV)

• R&D on high resolution LWS and on high power fiber laser technology

Talks by Laura Corner on ‘Latest results on laser wire developments’ and ‘High power laser wires using fibers’, Wednesday at 13h00 and 15h30Talks by Laura Corner on ‘Latest results on laser wire developments’ and ‘High power laser wires using fibers’, Wednesday at 13h00 and 15h30

Next two talks by M. Wendt / A. Lumpkin on ‘High performance imaging techniques using OTR’ and Benoit Bolzon on ‘CTF3 Screens Development’

A. Faus-Golfe on ‘OTR R&D at ATF2’, Wednesday at 12h30

Next two talks by M. Wendt / A. Lumpkin on ‘High performance imaging techniques using OTR’ and Benoit Bolzon on ‘CTF3 Screens Development’

A. Faus-Golfe on ‘OTR R&D at ATF2’, Wednesday at 12h30

9IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Transverse Profile Monitors - TDR

• Beam size monitoring using Diffraction Radiation

• Already few existing prototypes in IR and visible rangeE. Chiadroni et al, PAC,Albuquerque, New Mexico, USA, (2007) pp3982 A.H. Lumpkin et al, PRST-AB 10 (2007) 022802

• Alternative technology for both Drive and Main Beams• Drive Beam Injector Complex (2.4GeV) – typical beam size of 100um - • Ring To Main Linac (RTML) complex (2-9GeV) – Typical beam size of 5-10um• >100 of devices in total• Push the resolution to the micron range using DR in extreme UV• Experimental validation foreseen on CESR-TA @ Cornell

P. Karataev et al, PRSTAB 11 (2008) 032804

Photon yield:

Z c

2h

1

h slit width

10IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Longitudinal Profile Monitors - Baseline

Critical Issue on measuring 150fs bunches

with 20fs (6µm) resolution

Difficult to provide longitudinal profile

measurement and the bunch length evolution

over the pulse train with a single instrument

Longitudinal gymnastic for bunch

length shortening and lengthening and

for DB bunch frequency multiplication

Full longitudinal Profile (P) versus Bunch length

(L) - Complexity and Price

11IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Longitudinal Profile Monitors - Baseline

Combination of Streak camera and RF pick-up developed at CTF3

Collaboration with University of Dundee and Daresbury on Electro-Optical techniques for CLIC-type high resolution profile measurement

Coherent Diffraction Radiation monitor as a non-interceptive, cheap bunch length monitors

12IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Longitudinal Profile Monitors - Baseline

• CTF3 Instruments – for bunch length and bunch spacing measurements

• Streak Camera Measurements for longitudinal profile monitoring – length and spacing

• RF Pick-up for the evolution of the bunch length along the bunch train26-40GHz Ka waveguide connected to a fast Schottky barrier diode

• Streak camera RF pick-up

13IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Longitudinal Profile Monitors - TDR

• R&D on Electro-optical techniques on single shot temporal decoding techniques

•Investigation of new electro-optic materials for EO profile systems at CLIC.• Experimental characterization of thin films and meta-materials as novel EO detectors.

• Demonstration of the concept of a multiple crystal detector spanning a wide optical bandwidth

• Demonstration of single-shot X-FROG measurements on a laser-generated THz source.

• Demonstration of X-FROG detection on an electron beam source.

• Design of cost effective single shot bunch length monitor using •Coherent Diffraction Monitor

14IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

To

obta

in 2

0fs

reso

lutio

n

CDR in CTF3

60fs resolution at FLASH

9/27/2011 T. Lefevre, L. Søby IWLC 2011 - CLIC instrumentation, From CDR to TDR 15

Beam Energy monitoring - baseline

Bunch length manipulation Time-to-Energy correlation

Correlated Energy spread

• Ask for 10-3 accuracy and 10-4 resolution

• Charge limitations - Need for non-intercepting device

High current High Beam loading Strong energy

transient Time resolved spectrometry (10ns)

High energy spread in the Decelerator

9/27/2011 T. Lefevre, L. Søby IWLC 2011 - CLIC instrumentation, From CDR to TDR 16

Based on high accuracy BPM (50nm)

Using a bending magnet to create a dispersive region

Beam Energy monitoring CDR- TDR

• Dedicated measurement lines combined with an intermediate beam dump

•Measure Energy with high resolution BPM and Energy spread with time resolved beam size monitors

- Segmented dump works fine on CTF3 but will be limited because

of the much higher beam power

- Foreseen to develop segmented gaseous Cherenkov monitor for CLIC

to be developed and tested on CTF3 (TDR)

Beam

Beam Loss Monitors : Baseline

Possibly Cerenkov

radiator with PMT

• Two beam modules: 1 Ionisation chamber per Quadrupole

- 41484 Quadrupoles in DB

- 4020 Quadrupoles in MB

17IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

• Beam losses simulations using Monte-carlo code (FLUKA)• Establish limit for damage in rest of accelerator complex - Destructive losses on the Drive Beam or the Main beam when 1% (1.5 1012 part.) or 0.03% (3.5 1010 part.) of a single bunch train hits a single aperture restriction.

• Development the detection system• Difficulty to identify the source of the loss in the CLIC modules (Drive beam or Main beam)

•DB

• Look for cheaper detector than Ionization chambers using Cerenkov fibers

Beam Loss Monitors : TDR

Sophie Mallows on ‘Beam Loss monitoring for CLIC’, Today at 12h00Sophie Mallows on ‘Beam Loss monitoring for CLIC’, Today at 12h00

18IWLC 2011 - CLIC instrumentation, From CDR to TDR

Drive Beam losses Main Beam losses

9/27/2011 T. Lefevre, L. Søby

MB

Low energy

Beam Dump Lines & Luminosity Monitor

Luminosity monitor based on the detection of Beamstrahlung photons

• Large aperture beam line

• Uncharacteristic beam shape with a vertical dilution

Need to transversely separate photons from charged

particles

Edda Gschwendtner on ‘Post-collision line and dumps’ Thursday at 12h0Edda Gschwendtner on ‘Post-collision line and dumps’ Thursday at 12h0

Energy deposition in the main water dump

Disrupted beam

Beamstrahlungphotons

19IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Un collided beam

• Beamstrahlung photons converted in Muons• Muons detected outside the shielding block behing the Water Dump

Armen Apyan on ‘Luminosity monitor in post collision line’, Thursday at 09h30

Armen Apyan on ‘Luminosity monitor in post collision line’, Thursday at 09h30

Beam Dump Lines & Luminosity Monitor

20IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Detectors will be studied in more details during the TDR phaseDetectors will be studied in more details during the TDR phase

21

Perspectives & Conclusions

• Intensity and Polarization monitors not studied in details for the CDR TDR

• No real show stoppers identified….but reliability and maintenance is a concern

• Strong Collaboration in Beam Instrumentation

• ATF2 and CTF3 are is a CLIC Test Facility

• With a huge amount of devices, the TDR phase would have to address many

remaining issues:

• Prototyping most CLIC instruments

• Integration in the Machine layout

• Design, construction and validation

• Cost optimization

• Simplicity if applicable (not always compatible with tight tolerances)

• Standardization is a key concept

• Gain in Mass production

• Intensity and Polarization monitors not studied in details for the CDR TDR

• No real show stoppers identified….but reliability and maintenance is a concern

• Strong Collaboration in Beam Instrumentation

• ATF2 and CTF3 are is a CLIC Test Facility

• With a huge amount of devices, the TDR phase would have to address many

remaining issues:

• Prototyping most CLIC instruments

• Integration in the Machine layout

• Design, construction and validation

• Cost optimization

• Simplicity if applicable (not always compatible with tight tolerances)

• Standardization is a key concept

• Gain in Mass production

Nobuhiro Terunuma ‘Overview of ATF beam diagnostics’, Wednesday at 11h00Nobuhiro Terunuma ‘Overview of ATF beam diagnostics’, Wednesday at 11h00

IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Thank you for your attention

22IWLC 2011 - CLIC instrumentation, From CDR to TDR9/27/2011 T. Lefevre, L. Søby

Detect polarisation rotation proportional to E or E2, depending on set-up

thin EO crystal

chirped laser probe

Decoding: via single-shot cross correlation in a BBO crystal

~ ETHz

propagating

electric field

(THz)

polariser

Principle: Convert Coulomb field of e-bunch into an optical intensity variation

Encode Coulomb field on to an optical probe pulse - from Ti:Sa or fibre laser

electron bunch v ≈ c

yields the temporal intensity variations in a single laser pulse

( FELIX & FLASH )

E-O longitudinal bunch profile measurements

W.A. Gillespie & co

IWLCIWLC

E-O longitudinal bunch profile measurements

Single-shot Temporal Decoding (EOTD)

beam bunch

Temporal profile

of probe pulse → Spatial image of SHG pulse

stretched & chirped laser pulse leaving EO crystal assembly measured by short laser pulse via single-shot cross correlation in BBO

~1mJ laser pulse energy required (Ti:Sa amplifier)

W.A. Gillespie & co

IWLCIWLC

9/27/2011 T. Lefevre, L. Søby IWLC 2011 - CLIC instrumentation, From CDR to TDR 25

Beam Position Monitors - Baseline

Main beam BPM center piecewith dipole cavity

Drive beam BPM and quadrupole vacuum chamber assembly mockup.