ctf3 bpms
DESCRIPTION
CTF3 BPMs. Agenda. Different types of BPMs Electronics Radiation problems From CTF3 to CLIC. CRM. TL1. DL. CR. TL2. CLEX. C LIC T est F acility 3. A total of 137 BPMs. TL1 & CRM commissioned fall 200 6. Delay Loop: commissioned with beam 2005-2006. - PowerPoint PPT PresentationTRANSCRIPT
IWLC2010 CTF3 BPMs
CTF3 BPMs
October 18-22/2010Lars Soby
1
IWLC2010 CTF3 BPMs
Agenda
Different types of BPMsElectronicsRadiation problemsFrom CTF3 to CLIC
October 18-22/2010Lars Soby
2
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)
October 18-22/2010IWLC2010 CTF3 BPMs 6
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
October 18-22/2010IWLC2010 CTF3 BPMs 7
Inductive pick-up’s (BPM)
46 BPM’s installed as from march 2008
Developed by M. Gasior, CERN
October 18-22/2010IWLC2010 CTF3 BPMs 8
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
October 18-22/2010Lars Soby
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
October 18-22/2010Lars Soby
10
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)
October 18-22/2010IWLC2010 CTF3 BPMs 11
Developed by L. Thorndahl et al.
Button Pick-up’s (BPR)
October 18-22/2010IWLC2010 CTF3 BPMs 12
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.
October 18-22/2010IWLC2010 CTF3 BPMs 13
Button Pick-up’s (BPR)
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
October 18-22/2010IWLC2010 CTF3 BPMs 14
Button Pick-up’s (BPR)
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
October 18-22/2010IWLC2010 CTF3 BPMs 17
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
October 18-22/2010IWLC2010 CTF3 BPMs 18
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
October 18-22/2010Lars Soby
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
October 18-22/2010Lars Soby
20
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
22
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.
October 18-22/2010Lars Soby
24