Post on 26-Dec-2015
ILC Controls & InstrumentationR&D Activities at Fermilab
G. Tassotto, M. Votava, M. WendtFermi National Accelerator Laboratory, Batavia, IL 60510,
U.S.A.
Layout of the M-Test Secondary Beamline for ILC Detector Components
Beam Instrumentation:• Proportional wire chambers (PWC)• Scintillation Counters
PROPORTIONAL WIRE CHAMBER
Presently used in secondary, low intensity, beamlines
QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.
Chamber Specifications
• X,Y sense plane between HV foils.• require vacuum break.• lots of material in the beam• Gas - ArCO2 80/20 %• Electron charge make up the signal• Typical setting: -2400 V to display
20,000 particles.
Electronics
• 96 channel integrator (FNAL design)• Integration time from 1 sec to 6.5 sec• Dynamic range: X1, X10, X100• 16 bit ADC • Sensitivity = 0.312 mV/ADC count• Noise 0.2% of full scale• Calibration feature
Installation
Picture of chamber MT6WC1 after installation and alignment
FIBER PROFILE MONITORWill replace PWC in M-Test secondary beamline
• Low beam energy – 1 GeV• Low beam intensity - down to a few ppp• Cycle time - 1 min.• Spill time - 4 sec.
System parameters:• Burle Multianode MCP PMT
HV = -2300 (Gain = 800,000)
• Nanometrics N277 threshold = 1.86
• Estimated discriminator threshold = 5 photo electrons (pe)
• Light output ≈ 5 pe/Mip/fiber (Mip = minimum ionization particle)
Wire Plane Assembly
Layout of 16 3/4 mm horizontal fibers on ceramic substrate that will show a vertical beam profile.
The vertical fibers are epoxied behind the the ceramic.
Final Assembly
X and Y fibers planes are installed inside a vacuum can. The 64 signals are taken from the MCP via a 50 conductor cable to a standard Fermilab SWIC scanner.
Cookie
The fibers are bundled and epoxied in a “cookie” to match the Burle multichannel plate (http://www.burle.com/mcp_pmts.htm).
RF
-gun booster cavities
1 & 23.
9 G
hz c
av
doublet triplet quadsbeamtrans.
bunch compressor dipole
low energyinjector dump
ILC Module 1
B
doublethigh energy beam dump
dog-leg test beam-line (TBD)
HOM couplers
T YF
T
B C O B O SO
S T O O YO
O OS
T
OPS
P
SOC
T OS YO
S
S
O
S O
T C B T
S O S T O S O S S
S
test beam-line for advanced beam instrumentation, e.g.EOS, Laser-wire,
OTRI, cavity BPM’s,…
S
S
doublet doubletcorrectors
corr
ecto
rs
dipole
OS
T
doubletquad
dipole doublet
corr
ecto
rs
~ 19 meters
~ 22 meters
Layout of the ILC Test Accelerator (ILCTA) at the “New Muon Lab” (NML) building – not to scale
Basic beam instrumentation:
Beam current / bunch charge monitor
(T: toroid)Beam position monitor (B: button, S: stripline, PS: perpendicular stripline, C:
cavity)Screen monitor (some multifunctional) (Y: YaG, O: OTR, C: CTR, S: slit, F: Faraday-cup)
Time-of-flight or beam phase monitor
Synchrotron light bunch length monitor(P: pyro detector)
TDB: beam loss monitors (BLM)
Cold L-Band Cavity BPMfor the Cryomodule
Principle of Operation
Problems with simple“Pill-Box” Cavity BPM’s:• TM010 monopole common
mode (CM)• Cross-talk (xy-axes,
polarization)• Transient response (single-
bunch measurements)• Wake-potential (heat-load,
BBU)• Cryogenic and cleanroom
requirements
ILC/ILCTA Controls System
ILC Challenges• High Availability – 99.999%
uptime• Phase reference distribution• Remote Control – possibly 3
control rooms world-wide• Sheer length and number of
components – database tracking critical
Operator Displays
Archiving
Electronics
Diagnostics
Operator Displays
Frequency, GHz 1.46
Loaded Q ~ 600
Beam pipe radius, mm 39
Cell radius, mm 114
Cell gap, mm 10
Waveguide, mm 122x110x25
Coupling slot, mm 47x5x3
Window –Ceramic brick of alumina 96%
r ≈ 9.4
Size: the same as slot
N type receptacle,50 Ohm,D=9.75 mmd=3.05 mm
EM Modeling of the Waveguide-loaded Cavity-BPM
• Waveguide-loaded pillbox with slot coupling.
• Dimensioning for f010 and f110 symmetric to fRF: fRF = 1.3 GHz, f010 ≈ 1.1 GHz, f110 ≈ 1.5 GHz.
• Dipole- and monopole ports, no reference cavity for intensity signal normalization and signal phase (sign).
• Qload ≈ 600 (~ 10 % cross-talk at 300 ns bunch-to-bunch spacing).
• Minimization of the X-Y cross-talk (dimple tuning).
• Simple (cleanable) mechanics.• Iteration of EM-simulations for
optimizing all dimensions.
N2 Temperature Cycling of a Test Cavity-BPM (without Waveguide Ports)
Waveguide-loaded Cold Cavity-BPM: View of the Preliminary Construction
8 x
MMM
CREV
FWD
KLY
XFMR
ModulatorDriver
LLRF crate 1:- CPU, PS- 3x LLRF- BPM- Timing Distribution- (HOM coupler)
Modulator Control & Interlock (Rack)
Klystron Control & Interlock
Cryogenic Controls (Rack)
REV FWD
2x e--field
Temp (RTD)
CouplArc(air)
WGArc
RF Phase Reference Line
WG pressure
Vacuum Controls (Rack)
M M M M M M M MBeamPickup
24x Cavity Probe (plus optional 1..48x HOM coupler)
M M M M M M M M
BPM & Magnet
M M M M M M M M
8 x
MMM
CREV
FWD
8 x
MMM
CREV
FWD
8x Coupler
Cryomodule
Accelerator Tunnel
Service Tunnel
Timing & Synchronization
Inter-System Feedback Network/Bus
MPS Network/Bus
RT Control Network
Local Oscillator
LLRF crate 3:- CPU, PS- Motor Controller- Piezo Controller
Temp(KLX)
Temp(KLX)
Temp(KLX)
Temp(KLX)
LLRF crate 2:- CPU, PS- RF Interlock Systems
LLRF & Instrumenation Rack
WG pressWGArcKlyArc
7xFWD/REV
optional HOM (1..48x)CavREV (24x)CavFWD (24x)CavProbe (24x)Reference (3x)
BeamPickup (3x)BPM (3x)
48x signal (PMT pwr&gain)
72x coax (PMT sig.)
24x fiber (photo arc)
110x Motor
48x Piezo
Temp(KLX)
WG pressureWG pressure
REV FWD REV FWD
WGArc
Pow
er &
Hig
h Le
vel S
igna
l Pen
etra
tion
RF
& L
ow L
evel
Sig
nal P
enet
ratio
n
M
PMT (vac)
2x e--field
Temp (RTD)
CouplArc(air)
M
PMT (vac)
2x e--field
Temp (RTD)
CouplArc(air)
M
PMT (vac)8x Coupler 8x Coupler
Klystron Water PLC
KlyArcKlyArc
ILC LLRF Layout for a Main Linac RF Station