CTF3 BPMs October 18-22/2010 IWLC2010 CTF3 BPMs Lars Soby 1.

IWLC2010 CTF3 BPMs

CTF3 BPMs

October 18-22/2010Lars Soby

1

IWLC2010 CTF3 BPMs

Agenda

Different types of BPMsElectronicsRadiation problemsFrom CTF3 to CLIC


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IWLC2010 CTF3 BPMs

DLTL1

CRM

CRTL2

CLEX

CLIC Test Facility 3

3

TL1 & CRM commissioned fall 2006

Linac: commissioned with beam 2003 - 2004

Delay Loop: commissioned with beam 2005-2006

CR commissioning since 2007

TL2 and TBTS commissioning started August 2008

October 18-22/2010

A total of 137 BPMs

Electrostatic Pick-up (BPE)

October 18-22/2010IWLC2010 CTF3

BPMs 4

Phase

len

gth

[m

m]

Delta electrodes

Feed-through’s

RF contacts

Electrode, C~100pF

Elec

eff

C

l

v

titV

)()(ˆ

Developed by L. Søby, CERN

October 18-22/2010IWLC2010 CTF3 BPMs 5

Electrostatic PU (BPE)

BPE sum signals

Electrodes charging updue to beam halo!

Buffer amplifier, RL=1MΩHT bias

ElecLLow CRF

2

1

Inductive Pick-Up’s (BPM, BPI, BPS, EuroTeV)


n

R

I

VR S

BT 2

22π2

1

n

R

Lf SL

22n

RR SP

Robust and well know design (LPI)

Electrodes outside ceramic chamber

Each transformer has one calibration turn.

Provides current measurement.

Many different parts gives limited absolute accuracy

Resolution limited to ~ 50um.

C

SL R

n

RL

f22π2

1

C

SL R

n

R

Lf 22π2

1

Ferrite

Electrode

Current transformer

Titanium


Inductive pick-up’s (BPM)

46 BPM’s installed as from march 2008

Developed by M. Gasior, CERN


Inductive Pick-up’s (BPI)

52 BPI’s installed as from march 2008

4 electrodes installed on racetrack chamberCurrent transformer with 30 turns and RL=14Ω

Developed by A. Stella, Frascati

IWLC2010 CTF3 BPMs

EuroTeV Inductive BPM


9

-0.004 -0.002 0 0.002 0.0040

5

10

15

20

25Histogram

[mm]

Stdev1PBPM _1.5A= 0.6µm

IWLC2010 CTF3 BPMs

Inductive BPS


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BPM developed by Juan J. Garcia-Garrigos, IFIC Valencia, Spain

Electronics by: G. Montero UPC, Barcelona, SpainNoisy and wrong measurements close to PETS

Button Pick-up’s (BPR)


Developed by L. Thorndahl et al.



3.5GHZ

3.5GHZ

3.5GHZ

3.5GHZ

-20dB

-20dB

-20dB

-20dB

Splitter

RF 3GHz

Phase shifter Phasecontrol

Active hybrid

V

H

Power supplyand control

ADCSIS3300

Button electronics

Phase set to minimum

Phase set to maximum.



0 200 400 600 800 100015

10

5

0

5

10

15

t (ns)

BP

R s

igna

l (a.

u.)

BPR – RF phase monitor

Phase advance per turn (3GHz)

2*

N

Simulated signal

Combination factor 4Combination factor 4 with + 5 error

Plot by R. Corsini

Combiner ring path length



CL.BPR0290CL.BPR0475CT. BPR0532CR.BPR0532CC.BPR0915

Vacuumwindow AL2O3

2 x HornAntenna

30dBattenuation.

Wave guideWR28 ~1-2m SMA

26dB-12dB10dB 20dB

ADCSIS3300

RFdetector

Waveguide electronics

RF in

Shorter bunches means more power in the

WR28

Re-entrant Cavity BPM (CALIFES)

Re-entrant geometry for a higher frequency separation between the monopole and dipole modes. → Better CMRR Resolution: ~ 1um (CALIFES ~5um)Qld = 50 → Time resolution ~ 2-3ns

ID 18mm; Length ~100mm.

October 18-22/2010IWLC2010 CTF3 BPMs 15 15

Developed by M. Loung, C. Simon, Sacley

October 18-22/2010 IWLC2010 CTF3 BPMs 16

Re-entrant cavity BPM electronics

Re-entrant Cavity BPM (CALIFES)

Only one BPM at a time


Acquisition system: Linac, CR

Tunnel Control room

Front-end electronics gives improved CMRR.

Calibration of position and intensity .

Observation of analogue signals

“Standard” acquisition system


LAPP Acquisition system: TL2, CLEX

TunnelCLEXGallery

• Front-end electronics maintained.

Signals digitized in tunnel →Big reduction in cable costs

No analogue signal observation .

IWLC2010 CTF3 BPMs

LAPP acquisition system


19

BPM23

5

Mer

cury

BPI135

BPI775

BPI845

BPI925

BPM27

5

BPI248

BPM36

5

BPM47

5

Venus

Terre

BPI845

BPI395

0

500

1000

1500

2000

2500

Integrated dose

Gy

Designed to withstand 300GY. FPGA sensitive part.Communication link died rather quicklydue to too high radiation doses.

LAPP is developing new front end acquisition system. To be used on each CLIC module not only for BPMs, but for all “clients”

IWLC2010 CTF3 BPMs

Calibration


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IWLC2010 CTF3 BPMs

From CTF3 to CLIC

October 18-22/2010Lars Søby

21

Accuracy Resolution StabilityBandwidthBeam tube

aperture

Available length

How many?

Used in RT

Feedback

MB 5µm 50nm 100nm 20MHz 8mm < 80mm 4176 Yes

DB 20µm 2um 20MHz 23mm ~100mm 43000 Yes

CTF3 ~300µm <50µm ? 100MHz 40mm? ~200mm 135 No

High accuracy and resolution as well as big numbers eliminates inductive BPM’s!

If 1% of our BPMs fail we have more than 500 BPMs not working and which must be repaired. IN CTF3 we have had only 2 BPMs failing…….

IWLC2010 CTF3 BPMs

Main linac BPM’s (baseline)

October 18-22/2010Lars Søby

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Main beam BPM Drive beam BPM

IWLC2010 CTF3 BPMs

From CTF3 to CLICLarge scale projects come along very rarely at CERN

SPS LEP 13 yearsLEP LHC 19 yearsLHC CLIC ?

Experience is unfortunately lost along the wayFew of the LEP BI construction team saw beam in LHCSimilar mistakes were probably made again

Main Points Retained from LHC Experience (1000 BPMs)Clear functional specifications required very earlyClear project management structure essential from the outsetR&D, design & testing times largely underestimated

Especially true when designing for radiation environmentsStandardisation across domains improves effectiveness as a

wholeQuality assurance procedures important for large scale

productionHost laboratory personnel time to be foreseen for

collaborations Lars Soby 23October 18-22/2010

Slide by R. Jones

IWLC2010 CTF3 BPMs

SummeryNew CLEX and TL2 acquisition system has problems

with CPU load, due to too many clients. Work around being looked into by CERN controls group.

New calibration GUI is very useful.

Noisy signals on BPS close to PETS in TBL line. This is an important information for CLIC and is being looked into.

Radiation damage of first generation FE digitizers has shown the need for a robust, simple and standard module acquisition system.

CLIC is very different (numbers) from CTF3 and it is very difficult to draw any other conclusions which can be used for CLIC.


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CTF3 BPMs October 18-22/2010 IWLC2010 CTF3 BPMs Lars Soby 1.

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