Download - Status of the PS TFB
Status of the PS Status of the PS TFBTFB
J. Belleman, E. Benedetto, F. Caspers, D. Glenat, R. Louwerse,
M. Martini, E. Métral, V. Rossi, J. Sladen, J.M. Nonglaton
Acknowledgments:
R. Steerenberg, S. Gilardoni
1. Hardware Overview2. Machine results3. To be done
Alfred Blas APC 30/1/2009APC 30/1/2009 11
PS TFBPS TFB
Green boxes represent devices to be completed
Block diagram
Alfred Blas APC 30/1/2009APC 30/1/2009 22
PS TFBPS TFB
Kickers + transformers PS SS 97Power + electronics 355-R-017 Water distribution 355-R-017
Clock distribution PS CB
Hardware setup
Alfred Blas APC 30/1/2009APC 30/1/2009 33
PS TFBPS TFB Pick-up amplifiers J. Belleman
BW: 20 kHz – 40 MHz80 dB dynamic range (compatible with ions)
Remotely programmable gain
Located in the ring below concrete slab
Alfred Blas APC 30/1/2009APC 30/1/2009 44
PS TFBPS TFB DSPU hardware V. Rossi
Alfred Blas APC 30/1/2009APC 30/1/2009 55
PS TFBPS TFB DSPU firmware
Alfred Blas APC 30/1/2009APC 30/1/2009 66
Green boxes represent functions to be completed
PS TFBPS TFB
1 GHz DDSReceives the frequency program from the PS central building and outputs the 160*Frev (< 80 MHz).
Clock GeneratorTransforms 10 MHz into 1 GHz
Clock generation J. Sladen
Alfred Blas APC 30/1/2009APC 30/1/2009 77
PS TFBPS TFB Pre-Amplifier
Fast Clipping of the output signal
0 and 180o outputs
Programmable gain
TFM setup
Local / Remote control
Interface with the PLC control
Alfred Blas APC 30/1/2009APC 30/1/2009 88
PS TFBPS TFB Power Amplifier R. Louwerse
[2.5 kHz – 25 MHz], 3kW – 2ms, 800W – CW
Alfred Blas APC 30/1/2009APC 30/1/2009 99
PS TFBPS TFB Impedance matching transformers R. Louwerse
Input impedance: 50 ΩOutput impedance: 100 Ω [ 2kHz – 40 MHz] 3 kW
Alfred Blas APC 30/1/2009APC 30/1/2009 1010
PS TFBPS TFB Kicker F. Caspers, V. Bretin
Alfred Blas APC 30/1/2009APC 30/1/2009 1111
PS TFBPS TFB Kicker
Alfred Blas APC 30/1/2009APC 30/1/2009 1212
PS TFBPS TFB Power loads
50 Ω / 30 dB Attenuator[ DC – 1GHz] 1 kW CW
100Ω to 50Ω resistive transition[ DC – 190 MHz] 1.6 kW CW
Alfred Blas APC 30/1/2009APC 30/1/2009 1313
PS TFBPS TFB PLC Power Control D. Glenat
Alfred Blas APC 30/1/2009APC 30/1/2009 1414
PS TFBPS TFB
Operation display
J. M. Nonglaton
Alfred Blas APC 30/1/2009APC 30/1/2009 1515
PS TFBPS TFBResults: Automatic delay
•Resolution=0.4ns
•Measurement time: 22 us
•Maximum jitter : 260 ps
•Precision requirement:
1.1 ns for 10o error at 25 MHz
Alfred Blas APC 30/1/2009APC 30/1/2009 1616
PS TFBPS TFB Machine Results Auto Dly + Hilbert
The proper functioning of the automatic delay has been tested during an MD on MDPS (22/09/08) with a copy of the SFTPRO beam.
The beam transfer function was measured on the 3.5 GeV plateau and on the 14 GeV plateau.
If the phase response of all betatron lines can be superimposed, the delay is correct. The parameters of the automatic delay were set at 3.5 GeV for a proper phase response and the measurements made again at 14 GeV proved that the circuit behaved as expected.The measurements made another day at 1.4 GeV gave the same positive results.BTF of a Q+q betatron line
Alfred Blas APC 30/1/2009APC 30/1/2009 1717
PS TFBPS TFB Results: Notch Filter
Alfred Blas APC 30/1/2009APC 30/1/2009 1818
PS TFBPS TFB Results: Hilbert Filter
Without Notch Filter – set value = 45o With Notch Filter – set value = 45o
M= 3 Hilbert
Alfred Blas APC 30/1/2009APC 30/1/2009 1919
PS TFBPS TFB Results: Hilbert Filter
Without Notch Filter – set value = 45o With Notch Filter – set value = 45o
M= 1 Hilbert
Alfred Blas APC 30/1/2009APC 30/1/2009 2020
PS TFBPS TFB Sensitivity to Q measurement
With the PU in SS98 and the kicker in SS97, the ideal betatron phase lag within the TFB path can be
expressed as follow (qH,V Є [0 , 0.5]):
ΔφB-TFB = -111.6o + (536.4o * q) in the case of no delay for the dephasing (2 PUs!)
ΔφB-TFB = -111.6o + (896.4o * q) in the case of 1TREV delay for the dephasing (m=1 Hilbert)
ΔφB-TFB = -111.6o + (1616.4o * q) in the case of 3TREV delay for the dephasing (m=3 Hilbert)
9o phase error for an error in q of 0.01 with the m=1 Hilbert
( <=> 4.5 kHz error in the FFT)
One measurement made on LHC25. 11/11/08
The Q measurements are supposed to have a precision of 100ppmUnfortunately during the tests we had a jitter from cycle to cycleThe rf clock of the Q measurement doesn’t take into account the loop errors of the RFLL.Is this the explanation?
Alfred Blas APC 30/1/2009APC 30/1/2009 2121
PS TFBPS TFB Results
500 μs/div
30mm p-p initial H error MDPS 1.4 GeV flat cycle with no Chromaticity and no coupling23/10/08
PSB MD1 beam 55.1010 p injected (3 turns in R3)
Injection error obtained by setting PI.KFA45 to 270 kV instead of 300 kV
Inj. error Damping: 20mm/ms @ 1.4 GeV (21mm/ms required for the most demanding case: Pilot beam εn = 0.8μm)
Power system used for controlled blow-up (slow extraction) and Q measurement
From M. MartiniAPC 26/5/2005
Alfred Blas APC 30/1/2009APC 30/1/2009 2222
PS TFBPS TFB Results
500 μs/div
30mm p-p initial H error
Alfred Blas APC 30/1/2009APC 30/1/2009 2323
Zoom top = h position bottom = kick 2μs/div
PS TFBPS TFB Results MD 11/11/2008 E. Metral
•LHC25 injection plateau at 1.4 GeV with linear H/V coupling (Iskew =-0.3)
•Without coupling (Iskew = +0.3)
•See logbook for more details (11/11/08)
•Last plot taken from a good shot; not always the case
(The Betatron phase was set to an empirical fixed value!)
Alfred Blas APC 30/1/2009APC 30/1/2009 2424
With coupling – No TFB Without coupling – No TFB
Without coupling – With TFB
PS TFBPS TFB Results MD 11/12/2008
•Q measurement
Alfred Blas APC 30/1/2009APC 30/1/2009 2525
Without coupling – No TFB
Only the H plane is excited
PS TFBPS TFBThe MDs on the machine show that the PSTFB fulfills the expected requirements:
Kick efficiency Automatic delay Hilbert filter Remote control of the DSPU and of the Power system Usage of the power system for the Q measurements and controlled blow-up
Improvements for 2009:
Hardware 2 fully loaded DSPU modules instead of the single beta version. 2nd input on the DSPU with a serial delay for the 2nd PU. ( -> lower sensitivity to Q value) 3rd and 4th inputs on the DSPU for the PU SUM signals (normalization of the Delta signal) DSPU input impedance varies with the input attenuation (52 -> 72Ω) Install a driver for a better compatibility with the Q measurement excitation
Firmware Notch filter could be modified for a more suitable phase response Q-to-Hilbert-phase LUT should be adapted to take into account the phase errors of the Hilbert (with respect to the command) together with the response of the Notch.
Software Q (h and V) measured along the cycle (0.01 precision) and value sent to a GFAS (PA.GSTFBH and PA.GSTFBV) PU control knob to be created (Automatic gain as a function of peak beam intensity ?)
Other Q measurement (rev clock used for the sampling of the beam signal precise enough ?)
Conclusion
Alfred Blas APC 30/1/2009APC 30/1/2009 2626