BPM overview Lars Soby 1CLIC Beam instrumentation work shop, CERN, 2nd & 3rd of June 2009, Lars Søby

BPM overview

CLIC instrumentation work shop 2-3 June 2009

2CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby

CLIC BPM overview CLIC module Main beam BPM Drive beam BPM FE electronics Outlook

3CLIC instrumentation work shop 2-3 June 2009

Acc. Res. Stab. BW Φ NB FB MPS

100 µm 50 µm ? 1 GHz 40 mm 189 ? ?

Injectors

1004

310

210

50

~3.7* 109 charges per bunch2GHz bunch spacingIpulse ~1.5A

BPM overview Lars Soby

4CLIC instrumentation work shop 2-3 June 2009

Acc. Res. Stab. BW Φ NB FB MPS

10 µm 10 µm ? 10MHz 20/9 mm 600 Yes ?

Pre damping rings

300 300

Plus a few fast BPMS for instability observations. 2GHz BW, 10µ resolution!

~3.7* 109 charges per bunch2GHz bunch spacingIpulse ~1.5A

BPM overview Lars Soby

5CLIC instrumentation work shop 2-3 June 2009

Acc. Res. Stab. BW Φ NB FB MPS

10 µm? 2 µm ? 10MHz 20/9 mm 600 Yes ?

Damping rings

300 300

Plus a few fast BPMS for instability observations. 2GHz BW, 10µ resolution!

~3.7* 109 charges per bunch2GHz bunch spacingIpulse ~1.5A

BPM overview Lars Soby

6CLIC instrumentation work shop 2-3 June 2009

Acc. Res. Stab. BW Φ NB FB MPS

100µm 10µm ? 10MHz? ? 1404 ? ?

BC1, Booster Linac, Transfer lines, BC2

30 30

80

1010400 400200 200

1212

OBS: Req. resolution for BC2 is 100µ.

~3.7* 109 charges per bunch2GHz bunch spacingIpulse ~1.5A

BPM overview Lars Soby

7CLIC instrumentation work shop 2-3 June 2009

Acc. Res. Stab. BW Φ NB FB MPS

20µm 20µm ? 100MHz 40mm 900 ? ?

DBA, DL’s, CR’s and transfer lines

30 30

~8.4* 109 charges per bunch12GHz bunch spacingIpulse ~100A

60

1010

350 35060

BPM overview Lars Soby

8CLIC instrumentation work shop 2-3 June 2009

Acc. Res. Stab. BW Φ NB FB MPS

? ? ? 100MHz 200mm 848 ? ?

DB Long transfer lines

424 424

~8.4* 109 charges per bunch12GHz bunch spacingIpulse ~100A

BPM overview Lars Soby

9CLIC instrumentation work shop 2-3 June 2009

DB Turn around’s

960 960

Acc. Res. Stab. BW Φ NB FB MPS

20µm 20µm ? 100MHz Var. 1920 ? ?

~8.4* 109 charges per bunch12GHz bunch spacingIpulse ~100A

BPM overview Lars Soby

10CLIC instrumentation work shop 2-3 June 2009

DB decelerators + beam dumps

20740 20740

Acc. Res. Stab. BW Φ NB FB MPS

20µm 2µm 2µm 10MHz 23mm 41576 Yes Yes

4848

~8.4* 109 charges per bunch12GHz bunch spacingIpulse ~100A

BPM overview Lars Soby

11CLIC instrumentation work shop 2-3 June 2009

Main beam Linac + BDS

2088 2088

Acc. Res. Stab. BW Φ NB FB MPS

5µm 50nm 5µm 10MHz 8mm 4776 Yes Yes

300300

~3.7* 109 charges per bunch2GHz bunch spacingIpulse ~1.5A

BPM overview Lars Soby

12CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby

Accuracy Resolution Stab. BW Φ NB FB MPS

Injectors 100 µm 50 µm ? 1 GHz 40 mm 189 ? ?

Pre damping rings 10 µm 10 µm ? 10MHz 20/9 mm 600 Yes ?

Damping rings 10 µm? 2 µm ? 10MHz 20/9 mm 600 Yes ?

BC1, Booster Linac, Transfer lines, BC2 100µm 10µm ? 10MHz? ? 1404 ? ?

DBA, DL’s, CR’s and transfer lines 20µm 20µm ? 100MHz 40mm 900 ? ?

DB long transfer lines ? ? ? 100MHz 200mm 848 ? ?

DB Turn around’s 20µm 20µm ? 100MHz Var. 1920 ? ?

DB decelerator’s 20µm 2µm 2µm 10MHz 23mm 41576 Yes Yes

MB Linac 5µm 50nm 5µm 10MHz 8mm 4776 Yes Yes

BPM summery

A total of 52813 BPMs!!...or ~800MCHF

13

CLIC module, Type 1

Main Beam

Drive Beam

DB-BPM

MB-BPMWake Field Monitors

DB-BPM

CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby

CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby Lars Søby 14

Module types

8374

154

634

477

731

78

0?

4

5

5

1 BPM per quadrupole1WFM per accelerating structure

In total 10462 modules per Linac

15

Main beam choke BPM

Damping material, TM01

Beam

Developed by R. Fandos and I. Syrachev’s

• RF design is made, but mechanical design still needs to be done. See M. Wendts talk.• Better than 50nm resolution with time resolution of 10ns.• Low wake field impedances.

CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby

Coaxial antenna pickup

Choke where the TM11 mode is trapped

16

Multibunch ResolutionQ=100Res.=200nm

Q=1000Res.=200nm

16CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby

17

Wakefields

WT<<13V/pC/mm

WL<< <46V/pC

17CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby

Lars Søby 18

EUROTeV PBPM

Measured 600nm resolution with beam in CTF3.

CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby

6mm aperture.

19

Drive beam spectrum

0 1 1010 2 1010 3 1010 4 1010 5 10100

0.5

1

1.5Beam power spectrum

1.04

1.366 10 14

Amp f( )

5 10101 106 f

Chamber cutoff frequency 7.6GHz!!! HOM from PETS with several kilo Watt’s

Currentmodulation?

1) Introduce current modulation at e.g. 2GHz?2) Measure with button, strip line or inductive BPM at baseband3) Use other (unknown) spectral lines

HOM

BPM coupling impedance of -40dB would pump 300W!40000 BPMs would dissipate 12MW per pulse!!

Beam pulse power 240GW

CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby

20CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby

Front-end electronics in the tunnel

= Down converters, Signal conditioning, Calibration unitsAnalogue FE

Digital FE = Digitizers and control

< 35GY/Y

H=27, L=45, D= 30 cm

LAPP digital FEDesigned to resist up to 350GY

Analogue FE

CLIC instrumentation work shop 2-3 June 2009 BPM overview Lars Soby Lars Søby 21

More than 50000 BPMs which implies simple, cost effective and robust designs.For the main beam BPM a 14GHz low-Q cavity / choke BPM is presently being studied by Fermilab. See M. Wendt’s talk.Drive beam BPM:• High beam power is a potential problem.• Base band BPM seems best candidate, Button?, Stripline?• Adapt inductive BPM to 100A and 20um accuracy.

FE electronics and data transmission is being studied by LAPP. See S. Vilalte’s talk. 10um resolution and 2GHz BW BPMs needs attention.

Summery

All BPM systems needs to be studied and evaluated before end 2010!