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Accelerator R&D for Future Large Colliders at

IFIC

Scientific Staff:A. Faus-Golfe, C. Alabau, J.J. García, S. Verdu, J. AlabauTechnical Staff: J.V. Civera, C. Blanch

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Capabilities

- CALCULATIONBEAM DYNAMICS EXPERTISE:

Electromagnetic analysis

• Electric circuits & electronicsMechanical analysis

Optics designNon-linear dynamics studiesNew instrumentation techniquesCommissioning

3-D modelling of BPM

- PROTOTYPINGDesign: tooling, drawingsFabrication follow-upAssemblyTesting and Calibration

BEAM INSTRUMENTATION :

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Emittance simulations and measuremts in ATF

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Main ongoing projectsILC and its Test Facility ATF-ATF2:

Beam dynamic studies and commissioning of the ATF EXT line (LAL, KEK, SLAC)

Multi-OTR system for ATF2 (SLAC, KEK)

BPM supports with micromovers for FONT4 in (KEK, JAI)

BDS instrumentation studies

CLIC and its Test Facility CTF3:

BPM’s for the TBL in CTF3 (UPC, CERN, Applied Physics-UV)

Drive Beam BPM’s for CLIC module (CERN)

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Super Large Hadron Collider: Beam dynamics studies and measurements on beam halo, intensity reach and collimation efficiency (CERN-EUCARD)

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ATF was built in KEK (Japan) to create small emittance beams.The Damping Ring of ATF has a world record of the normalized emittance of 3x10-8 m rad at 1.3 GeV.

ATF2 has been built to study the feasibility of focusing the beam into a nanometer spot (~40 nm) and nanometer stability in a future linear collider.

Extraction line drives the beam

from ATF to ATF2

ILC and its Test Facility ATF/ATF2:

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(OT

R)

extractiondiagnostic section

wire scanners OTR monitor

ATF and ATF2: Emittance growth

Since several years, the vertical emittance measured in the diagnostic section of the EXT line is significantly larger than the emittance measured in the DR.The simulations and the measurements of the effect of non-linear magnetic fields (mainly QM7R) show an emittance growth with a strong dependence with the extraction position. But still there must be another source for the emittance growth since the extracted beam was significantly larger than expected in three of the data sets.Recently, the QM7R magnet was replaced by a similar one with larger aperture, for which magnetic measurements and simulations indicate that non-linear fields are negligible at the extraction position.

The beam passes horizontally off-axis through the shared magnets with the DR

ILC Spain 09Beam size at the OTR/XSR

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Emittance measurements with the wire scanners located in the diagnostic section of the EXT line are very slow.

(OT

R)

extractiondiagnostic section

wire scanners OTR monitor

Multi-OTR (4 units)beam dynamics studies, design, construction, and characterization including associated software control and electronics

ATF and ATF2: Multi-OTR System

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ATF and ATF2: Multi-OTR System

OTR

1X

OTR

0O

TR1

OTR

2

OTR

3O

TR4extraction diagnostic section

The location of the OTR’s has to be optimized such that the phase advances be apropiate to allow emittance measurements

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ATF and ATF2: Multi-OTR System

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Beam dynamics calculated with MAD to study the beam sizes in order to place the OTR’s.

MW0X

MW1X

y vs x x’ vs x y’ vs y

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ATF and ATF2: Multi-OTR System

Current OTR installed in the ATF2 EXT line

target

CCD camera

beam

The current OTR was updated with a new target and target actuator, calibrated and tested with beam during November ´09.

Beam spot measurement with OTR

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ATF and ATF2: Multi-OTR SystemNew design of the OTR

for ATF-ATF2

- Target actuator relocated to the top (no interference with the girder) and smaller design greater flexibility in the OTR placement

- Thinner target reduce radiation damage

- CCD camera parallel to the target (before it was not parallel, which meant that the beam spot was in focus on only a small portion of the target) greater depth of field.

- 12 bit camera for more dynamic range with smaller pixel size for more resolution.

New OTRs will have same controls and motion capabilities as current OTR with the following improvements:

Focus adjusterslide

X and Y targetposition viewingadjusters

Mitutoyo 10X lensAnd 1x tube lens

90deg mirror

Newport Vertical mover

NewportHorizontal mover

Target inserter

Prosilica camera

Installation planned on March´10

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ATF and ATF2: BPM’s supports with micromovers for FONT4

• Last line of defence against relative beam misalignment

• Measure vertical position of outgoing beam and hence beam-beam kick angle

• Use fast amplifier and kicker to correct vertical position of beam incoming to IR

FONT – Feedback On Nanosecond Timescales

IP intra-train feedback system

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ATF and ATF2: BPM’s supports with micromovers for FONT4

design, construction, and characterization including associated electronics and software development of 3 sets

Range: ±1 mmStep size: 10 μmStability better than 1 μmTime response ~ sec

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Realignment of BPM to increase the resolution

Labview Software developmentMovers & holding structure

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ATF and ATF2: BPM’s supports with micromovers for FONT4

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One set has been assembled and installed in ATF2. At the moment it’s under modification by magnetic problems.

Other two sets in construction. Software already finished.

Realistic simulations of the beam dynamics including the FONT feedback system are being made at the moment.

Mover installed at ATF2

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The TBL is designed to study and validate the drive beam stability during deceleration in CTF3. The TBL consists of a series of FODO lattice cells and a diagnostic section at the beginning and end of the line. Each cell is comprised of a quadrupole, a BPM (labeled as BPS) and a Power Extraction and Transfer Structure (PETS) .

3D View of a TBL cell with the PETS tanks, the BPS’s and the quadrupoles

2.25 cmBPS PrototypeInductive Pick-up (IPU)

TBL beam time structure

Inductive sensors PCB

The CLIC and its Test Facility CTF3:

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CTF3: BPM’s for the Test Beam LineBPS Prototypes, Series Production and Calibration A set of two prototypes of the BPS's labeled as BPS1 and BPS2 with its associated electronics has been designed, constructed and characterized by the IFIC team with the collaboration of the CTF3 team at CERN (May 2008).

BPS1 and its support installed in the TBL line

Measurements of the BPS1 with beam in the TBL line

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BPS1, jointly with its support and its amplifier, was installed successfully at TBL; BPS2 remained at IFIC as spare (July 2008). BPS1 first beam measurements were carried out (August 2008).

Wire set-up for BPS prototype characterization tests at CERN Labs

Low-frequency wire set-up 3D view design

Control and DAQ equipment for all the setup signals

Overview of the new wire test bench for BPS series characterization tests at IFIC labs

A new wire test bench for BPS series characterization tests was designed and built at IFIC (March 2009).

The BPS series production (15 units) started at IFIC labs (November 2008).

CTF3: BPM’s for the Test Beam LineBPS Prototypes, Series Production and Calibration Tests for BPS2 and BPS3 carried out with the new wire set-up at IFIC. Less than 50um accuracy (March 2009). Two more BPS units was delivered and installed, BPS2 and BPS3 both with new improved electronic PCBs (May 2009). 14 BPS units construction and assembly process finished (August 2009). A LabVIEW application (SensAT v1.0) is developed for automatize the BPS series characterization tests in the new wire test bench (September 2009). The 14 BPS units tests finishes, they are delivered to CERN and finally installed in TBL (October 2009). All the BPS are validated successfully in TBL after first calibration tests (October 2009).Beam tests in TBL for the full installed BPS series. Measurements at high beam current (30A) and checking of the BPS’ resolution and performances.

All BPS units jointly with its supports and amplifiers installed in TBL (CLEX area, CERN). Calibration test in TBL shows good BPS

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CTF3: BPM’s for the Test Beam Line

BPS High Frequency Test

3D views of the High frequency set-up designfor measuring the BPS longitudinal coupling impedance

• To determine the BPS longitudinal coupling impedance at more than 12GHz, affecting beam stability.• Development of HF set-up has been carried out in parallel of the BPS series production.• Electromagnetic simulation of HF set-up design (until 30GHz) with specialized software FEST3D• HF set-up manufacturing and BPS HF tests to be performed next January

Simulation results of last HF set-up design. S11 reflection parameter from 0 to 30GHz.

Simulation SW: FEST3D

Simulation SW: HFSS

-40dB

-40dB

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CLIC: Drive Beam BPM for the 1st CLIC module

DB BPM

The drive beam quadrupole and BPM are mounted on the drive beam girders. BPMs cannot be moved independently of the PETS, the quadrupoles will either be on movers, or equipped with dipole corrector coils. The BPMs are mounted before quadrupoles. The acceptable level of wake field needs to be determined.

Accuracy Resolution Stability Range Bandwidth Beam tube aperture

Available length

Intercepting device?

How many?

Used in RT Feedback?

Machine protection

Item?Comments Ref

BPM 20µm 2µm ? <5mm 35MHz 23mm 104/74mm No 41480 Yes Yes Inductive ?Strip line ? CLIC note 764

Nominal beam parameters: Charges/bunch: 5.2 1010

Nb of Bunches: 2922 Bunch length: 1mmTrain length: 243.7ns

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