status of the ps tfb
DESCRIPTION
Project triggered by : K. Schindl and R. Cappi Hardware : J. Belleman ( PU amplifiers ) T. Bohl, W. Hofle, F. Pedersen, V. Rossi ( Signal processing ) F. Caspers, J.L. Gonzalez, J. M. Lacroix, J.M. Roux ( Kickers ) - PowerPoint PPT PresentationTRANSCRIPT
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 11
Status of the PS Status of the PS TFBTFBProject triggered by: K. Schindl and R. Cappi
Hardware: J. Belleman (PU amplifiers) T. Bohl, W. Hofle, F. Pedersen, V. Rossi (Signal processing) F. Caspers, J.L. Gonzalez, J. M. Lacroix, J.M. Roux (Kickers) S. Livesley, J. Sladen (Local oscillator) R. Louwerse, M. Paoluzzi (Power amplifiers) R. Louwerse (Power transformers) S. Mathot (ceramics)
Hardware simulations: W. Hofle, J. Tuckmantel, V. Vendramini, E. Vogel
Beam decoherence study: E. Benedetto, M. Martini, E. Metral, F. Zimmermann
1. System block-diagram2. Background3. Hardware overview4. Power requirements
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 22
PS TFBPS TFB
BeamPick-up
2
Electronic corePre-
driver
PowerAmplifier
Kicker
TFBControl Interface
ClockGeneration
Particle Flight time
BetatronPhase difference
= (k+1)./2
BeamPick-up
1
Pick-upAmplifiers
signals
Blue boxes represent new hardware
Block diagram
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 33
PS TFBPS TFBBackground
05/98 First meeting, start of the PS TFB project
01/03 Project taken over by rf – kicker under BDI responsibilityStatus: 3kW Power amplifiers available (100 kHz HP cutoff !)
Horizontal magnetic kicker ordered
10/03 Successful test of a new electronic prototype and Pick-up amplifierswith the old kicker/amplifier pair
01/04 H kicker Delivered, Ceramic pipe not vacuum tight after brazing (weak metallization)
10/04 Order placed for re-metallization (SCT) and new ceramic rings (Hiperceramics)Transition pieces redesigned
12/04 Kickers measured by rf team (F.C., T.K.) because of the absence of resource from BDI.Result: bandwidth below requirements – can not cope with kicker ripple.
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 44
PS TFBPS TFBPick-up amplifiers(J. Belleman)
Were ready in October 2003for the MD session.BW: 20 kHz – 40 MHz80 dB dynamic range (compatible with ions).
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 55
PS TFBPS TFB Electronic core (V. Rossi)
Prototype has been tested in October 2003 for the MD session.Successful test although the automatic delay was not fast enough to cope with acceleration
New design ongoing using the same hardware as for LHC(VME board with integrated control interface via the VME bus)
Should be ready in spring 2006.
NotchFilter
HilbertFilter
AutomaticDelay
G
G
PU 1(Aux)
PU 2
BTFSet-up
GAIN
DAC OUT
M=1M=3
ON/OFFFilter coefs
160 *FREV 160 *FREV
40 MHz &160 *FREV
(KFLIGHT - KLOOP CLK)TFIX
Automaticdelay
PU1-PU2Particle
Flight time PU1
PU2
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 66
PS TFBPS TFB Clock generation (J. Sladen)
1 GHz DDS
Available since mid-2004
Will receive the frequency program from the PS central building and output the 160*Frev (< 80 MHz).This is well below its capabilities (400 MHz)
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 77
PS TFBPS TFB Requirements
Initial requirements: R. Cappi 1999
• Damping of a +/-1.5 mm oscillation (H only, not V) within 100 turns (200 µs)
• Bandwidth: [10kHz - 20 MHz] (q = 0.1 and 20 MHz kicker ripple)
Material ordered
• 2 x 3 kW (2ms); 2 x 200 W (CW) amplifiers
BW [100 kHz - 20 MHz]
• 12.5 Ω magnetic kickersUpdated requirements:
• Damping of a +/- 3 mm oscillation (H & V) with a time constant Td = 50 µs (cf. M. Martini)
• Bandwidth: [10kHz - 30 MHz] (q = 0.1 and 30 MHz kicker ripple)
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 88
PS TFBPS TFB Power Amplifier (M. Paoluzzi)
100 kHz – 35 MHz, 3kW – 2ms, 200W - CW
Available since 2001
The bandwidth doesn’t allow handling the first Betatron line (40 kHz @ q = 0.1)The first Betatron line is intrinsically stable for q < 0.5, but the amplitude-phase response of the amplifier makes it unstable => compensation circuit to be developed.
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 99
Power amplifier frequency response
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 1010
PS TFBPS TFB Kickers (J.L. Gonzalez, F. Caspers)
Cheap, Wide BW, both planes in one tank
Lower kick (50 times less in H), need an impedance transformer with the available amplifiers
OR
Greater kick (50 times more for the same power in the horizontal plane)
Expensive, limited bandwidth(not compatible with kicker ripple)
Strip-line Magnetic
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 1111
PS TFBPS TFB Relation between fields and amplitude decay
dVH
REV
T
u
LeTp
BE
,
9
91110
103.0
At PS injection: p =2.14 GeV/c TREV = 2.26 10-6 s β = 0.915L = 0.9 m βH,V = 22 m
dT
uBE
14010275 6⇔
∆u : Steering error [m]Td : requested damping time (1/e) [s]
E: [V/m]B: [V.s/m2]
Assuming a linear decay in saturation mode = 1/e in Td (conservative approach)
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 1212
PS TFBPS TFB Required power for the Strip-line kicker
η : kick efficiency (electrode shape + average Betatron phase)g : gap between electrodes = 14 cm (H) ; 6 cm (V)ZC : 112.5 or 50 Ω (practical values for transformers)∆u : initial steering error Td : requested damping time (1/e)
2
2
2
703
dcStripline T
u
Z
gP
⇒
For the strip-line kicker where B = μ0E/377
P ≥ 2 x 1764 W for the most demanding beampilot with 3 mm initial error => Td = 50 μsη=0.5 ZC=112.5 Ω – strip-line, β = 22 m
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 1313
PS TFBPS TFB
∆u : initial steering errorTd : requested damping time (1/e)η : kick efficiency (average Betatron phase)
2
2
3105.2
dMagnetic T
uP
⇒
For the 12.5 Ω magnetic kicker with 0.13 Gauss/A (negligible electric effect)
P ≥ 2 x 36 W for the most demanding beamspilot with 3 mm initial error and Td = 50 μsη =0.5
Required power for the magnetic kicker
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 1414
PS TFBPS TFB
The 64 ns transit time measured on the magnetic kicker makes it incompatible with the request for 30 MHz BW (injection Kicker ripple)
Dividing the magnetic kicker length by a factor 3 would be ok for the BW (9 times more power required = 330 W for the pilot beam)
The strip-line kicker fulfills all LHC beams requirements with 1.8 kW if located at a favorable position: β = 22 m. Fitting both planes in one tank would required 3.5 kW per amplifier in the less favored plane: β = 11 m. This means that no more than 2.8 mm would be tolerated with 3 kW in this plane.
Remarks concerning the kickers
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 1515
PS TFBPS TFB Impedance matching transformers(R. Louwerse)
Input impedance: 12.5 ΩOutput impedance: 112.5 Ω (x9)Each coax: 37.5 Ω = two 75 Ω in //Voltage gain = 3
BW: 2kHz – 40 MHz up to 3 kW
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 1616
PS TFBPS TFB Choices to be made
A strip-line H and V should be made available in 2006We could then have a complete operational setup that could cope with all LHC beams in the horizontal plane (only 2.8 mm error – instead of 3mm - accepted in the vertical plane). This means resources (see next slide)
Future possible upgradeVertical kicker in a separate tank to provide some headroom (now limited to 2.8 mm). This also means resources (see next slide)
A.BlasA.Blas APC meeting 12/5/2005APC meeting 12/5/2005 1717
PS TFBPS TFB Budget
No more money allocated to the project!260 kCHF need to be found to supply with an H/V strip-line damper in 2006.
-150 k: modification of 6 Power amplifiers- 15 k: redesign of the strip-line kicker (includes documentation)- 8 k: impedance matching transformers (includes shielding boxes and mechanical setup)- 10 k: 3kW power loads (includes mechanical setup)- 20 k: Power/interlock control system - 8 k: Water system (connections, detection)- 40 k: Electronic system (VME crate, circuits, spares) - 5 k: Cabling (within racks, in ring)- 6 k: Unexpected Total: 260 kCHF
Future possible upgrade 60 k : Design and construction of a separate tank for the vertical plane