bpm overview
DESCRIPTION
BPM overview. CLIC Beam instrumentation work shop, CERN , 2 nd & 3 rd of June 2009, Lars Søby. CLIC BPM overview CLIC module Main beam BPM Drive beam BPM FE electronics Outlook. Injectors. ~3.7* 10 9 charges per bunch 2GHz bunch spacing - PowerPoint PPT PresentationTRANSCRIPT
BPM overview Lars Soby 1CLIC Beam instrumentation work shop, CERN, 2nd & 3rd of June 2009, Lars SøbyCLIC Beam instrumentation work shop, CERN, 2nd & 3rd of June 2009, Lars Søby
BPM overviewBPM 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 Resolution
Q=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 1010
0
0.5
1
1.5
Beam power spectrum
1.04
1.366 1014
Amp f( )
5 10101 10
6 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!