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UK LC accelerator programme. Philip Burrows John Adams Institute Oxford University. CLIC-UK (started March 2011). CI/Manchester: main beam RF, crab cavities CI/Lancaster: crab cavities ASTeC: drive-beam quads + crab cavities JAI/Oxford: beam FB+FF, laserwire, BPMs

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uk lc accelerator programme
UK LC accelerator programme

Philip Burrows

John Adams Institute

Oxford University

slide2
CLIC-UK (started March 2011)

CI/Manchester: main beam RF, crab cavities

CI/Lancaster: crab cavities

ASTeC: drive-beam quads + crab cavities

JAI/Oxford: beam FB+FF, laserwire, BPMs

JAI/RHUL: transverse beam size, cavity BPMs

Dundee: longitudinal beam profile monitor

drive beam quadrupoles astec
Drive Beam Quadrupoles (ASTeC)

Erik Adli & Daniel Siemaszko

Low Energy Quad

High Energy Quad

High energy quad – Gradient very high

Low energy quad – Very large dynamic range

basic engineering concept
Basic Engineering Concept

Steel

PM Block

Steel Pole

Non-magnetic support

Norbert Collomb

slide10
Phase monitor (Frascati)

Signal down-mixer (CERN)

Feedback processor + firmware (JAI Oxford)

Drive amplifier (JAI Oxford)

Kickers (Frascati)

 1 mrad kick

 1.2 mm path length change

 17 degrees at 12 GHz

 0.2 degree resolution

CTF3 phase FF prototype

slide12
65kW peak power

Bandwidth > 50 MHz

1.2 us (non-combined) beam pulse

< 10% droop

PCB-based design using SiC FETs

Drive amplifier

atf2 kek prototype final focus
ATF2/KEK: prototype final focus
  • Goals:
  • 37 nm beam spot (65 nm achieved 2013)
  • Beam spot stabilisation at c. 5 nm level

14

atf2 kek prototype final focus1
ATF2/KEK: prototype final focus

Beam feedback + feed-forward systems

Precision cavity + stripline BPMs

Beam size diagnostics

Beam tuning techniques

15

slide16
Beam feedback + feed-forward (Oxford)
  • Aim to stabilise beam in IP region using 2-bunch spill:
  • 1. Upstream FB monitor beam at IP
  • 2. Feed-forward from upstream BPMs  IP kicker
  • 3. Local IP FB using IPBPM signal and IP kicker

16

upstream font5 system
Upstream FONT5 System

Analogue Front-end

BPM processor

FPGA-based digital processor

Kicker drive amplifier

Beam

Strip-line kicker

Stripline BPM with mover system

interaction point font system
Interaction Point FONT System

Analogue Front-end

BPM processor

FPGA-based digital processor

Kicker drive amplifier

Beam

  • Designed in house
  • 12.5 cm stripline kicker
  • Based on ATF stripline BPMs

Strip-line kicker

Cavity BPM

atf2 beam stabilisation results
ATF2 beam stabilisation results
  • Upstream FB: beam stabilised at IP to
  • ~ 300 nm
  • 2. Feed-forward: beam stabilised at IP to
  • ~ 106 nm
  • 3. IP FB: beam stabilised at IP to ~ 93 nm
  • Getting interesting! (i.e. hard)
atf2 beam position monitors rhul
ATF2 beam position monitors (RHUL)

IBIC : Beam Instrumentation at ATF2

(S. T. Boogert for ATF collab.)

clic main beam bpm prototype
CLIC Main beam BPM prototype
  • Low-Q stainless steel cavity
  • Simulation in
    • Gdfidl
    • Microwave studio
  • Measurement
    • VNA @ RHUL (before) and CERN (after brazing)
    • Beam measurements @ CALIFES
  • Dipole cavity
    • fdipole=14.993 GHz
    • QL= 274
    • Q0=450
  • Reference cavity
    • fdipole=14.960 GHz
    • QL= 150

IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.)

slide28
Electro-Optical Spectral Decoding (Dundee)

Simulations of bunch-induced polarisation change and non-linear interaction

Spectral Decoding (EOSD): The Coulomb field temporal profile of the e-bunch is encoded on to a time-wavelength correlated optical probe pulse. The profile is read-out through the spectrum of the probe pulse.

Where,

Where,

slide29
Implementation of the EO monitor at CALIFES

Diagnostic section

Accelerating structure

Photo-injector

Beam direction

Grating

P: Polarizer H: Half wave plate

Q: Quarter wave plate

: Mirror with actuators

: Finger camera

Laser:

Wavelength: 780 nm Duration: 100 fs

Repetition: 37.4815 MHz Pulse energy: 2.7 nJ

Crystal: Thickness: 1mm Separation: 5-10 mm

In Lab

In CLEX

10 Plane mirrors

3 Gratings

3 Lenses

1 Fibre head

1 Laser

1 ICCD Camera

1 Motor stage

7 Plane mirrors

2 Polarizers

2 Wave plates

1 Lens

1 Fibre head

  • 10 Actuators
  • 3 Rotation motors
  • Finger cameras
clic prototype 1 uk manufactured
CLIC Prototype 1 - UK manufactured

The 1st CLIC crab cavity prototype has been manufactured by Shakespeare Engineering in the UK. Tolerance and surface roughness on single parts have been measured and are acceptable.

  • Test by measuring S-parameters at each port then combining to get the dual port F-parameters.
  • Cavities have not been tuned yet.

Structure is planned to be tested at SLAC in the near future.

revised crab synchronisation scheme
Revised Crab Synchronisation Scheme

RF path length is continuously measured and adjusted

4kW5ms pulsed

11.8 GHz Klystron repetition 5kHz

Cavity coupler 0dB or -40dB

Cavity coupler 0dB or -40dB

Waveguide path length phase and amplitude measurement and control

Forward power main pulse 12 MW

Single moded copper plated Invar waveguide losses over 35m ~ 3dB

-30 dB coupler

-30 dB coupler

Expansion joint

Expansion joint

LLRF

Magic Tee

LLRF

Reflected power main pulse ~ 600 W

Reflected power main pulse ~ 500 W

Phase shifter trombone

Phase shifter trombone

(High power joint has been tested at SLAC)

Waveguide from high power Klystron to magic tee can be over moded

Phase Shifter

Main beam outward pick up

Main beam outward pick up

From oscillator

48MW200ns pulsed

11.994 GHz Klystron repetition 50Hz

Vector modulation

12 GHz Oscillator

Control

board development and cw tests
Board Development and CW tests

Front end electronics to enable phase to be measure during the short pulses to an accuracy of 2 milli-degrees has been prototyped and dedicated boards are being developed.

MCU

PLL controller

10.7 GHz VCO

Wilkinson splitter

Digital phase detector

400 ns span:

RMS: 1.8 mdeg

Pk-Pk: 8.5 mdeg

DBMs

90 s span:

Drift rate : 8.7 mdeg/10s

Total drift: 80 mdeg

Power Meters

Inputs

slide36
Main linac structure studies (Manchester)

Alternative designs including wakefield suppression of HOMs

slide37
CLIC_DDS_E Elliptical Design –E Fields

b

a

Circular

Square

Single undamped cell

Iris radius=4.0 mm

Convex ellipticity

uk lc machine expertise
UK LC machine expertise
  • Beam dynamics, beam transport, backgrounds …
uk lc machine expertise1
UK LC machine expertise
  • Beam dynamics, beam transport, backgrounds …
  • Beam instrumentation:
  • transverse and longitudinal emittance, BPMs …
uk lc machine expertise2
UK LC machine expertise
  • Beam dynamics, beam transport, backgrounds …
  • Beam instrumentation:
  • transverse and longitudinal emittance, BPMs …
  • Feedback and controls: fast analogue + digital FB …
uk lc machine expertise3
UK LC machine expertise
  • Beam dynamics, beam transport, backgrounds …
  • Beam instrumentation:
  • transverse and longitudinal emittance, BPMs …
  • Feedback and controls: fast analogue + digital FB …
  • Alignment, position monitoring and stabilisation …
uk lc machine expertise4
UK LC machine expertise
  • Beam dynamics, beam transport, backgrounds …
  • Beam instrumentation:
  • transverse and longitudinal emittance, BPMs …
  • Feedback and controls: fast analogue + digital FB …
  • Alignment, position monitoring and stabilisation …
  • Undulators, targets, beam dumps …
uk lc machine expertise5
UK LC machine expertise
  • Beam dynamics, beam transport, backgrounds …
  • Beam instrumentation:
  • transverse and longitudinal emittance, BPMs …
  • Feedback and controls: fast analogue + digital FB …
  • Alignment, position monitoring and stabilisation …
  • Undulators, targets, beam dumps …
  • RF cavities: wakefields, higher-order modes …
uk lc machine expertise6
UK LC machine expertise
  • Beam dynamics, beam transport, backgrounds …
  • Beam instrumentation:
  • transverse and longitudinal emittance, BPMs …
  • Feedback and controls: fast analogue + digital FB …
  • Alignment, position monitoring and stabilisation …
  • Undulators, targets, beam dumps …
  • RF cavities: wakefields, higher-order modes …
  • Collimation systems: design, sim. + meas. of wakefields
uk lc machine expertise7
UK LC machine expertise
  • Beam dynamics, beam transport, backgrounds …
  • Beam instrumentation:
  • transverse and longitudinal emittance, BPMs …
  • Feedback and controls: fast analogue + digital FB …
  • Alignment, position monitoring and stabilisation …
  • Undulators, targets, beam dumps …
  • RF cavities: wakefields, higher-order modes …
  • Collimation systems: design, sim. + meas. of wakefields
  • Vacuum systems
uk lc machine expertise8
UK LC machine expertise
  • Beam dynamics, beam transport, backgrounds …
  • Beam instrumentation:
  • transverse and longitudinal emittance, BPMs …
  • Feedback and controls: fast analogue + digital FB …
  • Alignment, position monitoring and stabilisation …
  • Undulators, targets, beam dumps …
  • RF cavities: wakefields, higher-order modes …
  • Collimation systems: design, sim. + meas. of wakefields
  • Vacuum systems
  • Magnet systems …
applicable to
Applicable to
  • Beam delivery system
  • Machine – detector interface
  • Damping rings
  • Positron source
  •  Strong role in a European team to deliver key system(s) for ILC
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