A.Blas APC meeting 12/5/2005 1 Status of the PS TFB Project triggered by: K. Schindl and R. Cappi Hardware: J. Belleman (PU amplifiers) T. Bohl, W. Hofle,

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


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


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.


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).


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


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)


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)


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.


Power amplifier frequency response


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


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)


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


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


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


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


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)


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

A.Blas APC meeting 12/5/2005 1 Status of the PS TFB Project triggered by: K. Schindl and R. Cappi Hardware: J. Belleman (PU amplifiers) T. Bohl, W. Hofle,

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