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ADT What could be delivered Plans for LS1 and beyond. F. Dubouchet W. Höfle G. Kotzian D. Valuch Special thanks to: A. Boucherie , A. Butterworth, S. Calvo , G. Cipolla , D. Jacquet , M. Jaussi , C. Julie, N. Jurado , F. Killing, E. Montesinos , C. Renaud. - PowerPoint PPT Presentation
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ADT What could be deliveredPlans for LS1 and beyondF. DubouchetW. HöfleG. KotzianD. Valuch
Special thanks to: A. Boucherie, A. Butterworth, S. Calvo , G. Cipolla, D. Jacquet, M. Jaussi, C. Julie, N. Jurado, F. Killing, E. Montesinos, C. Renaud
2
The transverse damper system Operation in 2012 was very smooth, routinely
switching between different modes and operating the feedback during the entire LHC cycle.
Several MDs ADT vs. BBQ cohabitation Noise vs. emittance conservation Fast controlled losses Increased bandwidth operation
New features Selective blow-up Tune observation “infrastructure” High bandwidth
Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013
3
ADT now Two pickups per
beam per plane
Gain modulation within the turn
Cleaning
Same analogue gain and bandwidth for all bunches and cleaning
ADT/BBQ cohabitation
Pickup Q7
Beam position module
Q7
Pickup Q9
Beam position module
Q9
Analogue output to the power amplifiers
Digital signal processing unit
DAC
Gain control (CCC)
CLEANING
Sequential observation
(Multiturn app.)
Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013
4
ADT now Pilot not visible in
standard operation Injection
oscillations on fixed display
Sequential observation of selected bunches up to 256k points Multiturn
application, offline analysis
Post mortem data
Pickup Q7
Beam position module
Q7
Pickup Q9
Beam position module
Q9
Analogue output to the power amplifiers
Digital signal processing unit
DAC
Gain control (CCC)
CLEANING
Sequential observation
(Multiturn app.)
Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013
5
Tune measurement tests ADT vs. BBQ cohabitation
Several tests and operational developments done on tune extraction from ADT
Witness bunch method: active kicking by 10’s mm Extraction of tune from the residual noise Passive observation of bunches with lowered gain
F. Dubouchet: Betatron tune measurement with the LHC damper using a GPU
Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013
6
Tune measurement testsTune measurement with active kicking of the first 6 (witness) bunches with full ADT gain. Horizontal plane, Beam 1, 12.8.2012.
Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013
“What you get” Transverse damper system, Evian 20127
Injection
Prepare ramp
Ramp
Pass
ive
obse
rvat
ion
of th
e fir
st 6
bun
ches
with
redu
ced
gain
. Hor
. B2
High gain: tune can be extracted from the residual noise
Low gain: tune can be extracted from the peak in damper BPM spectrum
Cleaning
High bandwidth (commissioned in 2012) Power amplifiers, 1st order low pass, -3 dB @ 1
MHz Power amplifier phase response compensated by
digital filter
kick @ 10 MHz,Only 10% strength left
Frequency domain measurements February 2012 B. Lojko.
Step response measurements 19.9.2012 D.Valuch, G.Kotzian
High bandwidth (commissioned in 2012) Measured enhanced frequency response reaches
beyond 20 MHz Bunch by bunch damper Enhanced bandwidth provides faster damping of
high frequency modes “Ideal damper” – treats each bunch individually Drawback – increase of noise injected through the
damper, mitigations for noise reduction foreseen for after LS1
10
ADT post-LS1 Major upgrade of
electronics to house all new features accumulated since 2009
Double the number of pickups, new upgraded beam position modules
Multiple output DACs: Independent
treatment of different bunch groups (high/low gain, high/low bandwidth)
Independent cleaning performance
Pickup Q7
Beam position module
Q7
Pickup Q9
Beam position module
Q9 Analogue output to the power amplifiers
Digital signal processing unit
DAC
Gain control (CCC)
CLEANING
DAC
Pickup Qx
Beam position module
Qx
Pickup Qx
Beam position module
Qx
DACBeam transfer function meas.
Observation box
Tune/instability
diagnostics box
Fast b-by-b Instability
diagnostics
CCC, users, logging
Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013
11
ADT post-LS1, new features* Bunch by bunch
instability trigger in the FPGA Anything visible by
the ADT could trigger What should be sent
to a fixed display? Independent
observation box, tune diagnostic box All bunches at full
rate, not perturbing the ADT operation
Advanced real time analysis
Save the fill data (ca. 1TB/hour/ring)
Pickup Q7
Beam position module
Q7
Pickup Q9
Beam position module
Q9 Analogue output to the power amplifiers
Digital signal processing unit
DAC
Gain control (CCC)
CLEANING
DAC
Pickup Qx
Beam position module
Qx
Pickup Qx
Beam position module
Qx
DACBeam transfer function meas.
Observation box
Tune/instability
diagnostics box
Fast b-by-b Instability
diagnostics
CCC, users, logging
* Certain features may be available only if sufficient resources are found
Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013
12
New pickups (standard optics)
B1 horizont
al
Q10L Q9L Q7L Q7R Q9R Q10Rb = 28
mb = 127
mb = 112
mb = 78
mb = 16
mb = 158
mexisting existing new new
B1 vertical
Q10L Q9L Q7L Q7R Q9R Q10Rb = 172
mb = 25
mb = 52
mb = 127
mb = 138
mb = 38
mnew new existing existing
B2 horizont
al
Q10L Q9L Q7L Q7R Q9R Q10Rb = 164
mb = 17
mb = 60
mb = 173
mb = 106
mb = 30
mnew new existing existing
B2 vertical
Q10L Q9L Q7L Q7R Q9R Q10Rb = 36
mb = 140
mb = 169
mb = 23
mb = 34
mb = 181
mexisting existing new newReview on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘.
15/3/2013
13
Plans for the LS1 Tune extraction
Decide on optimum after careful analysis of collected data and requirements collected from the BE/OP and BE/ABP/ICE
Witness bunches proved very promising, can we have a decision to keep them?
The independent external tune diagnostic box can do an advanced processing in real time of the bunch by bunch data
Instability detection, any activity which is visible by ADT could be detected (bunch by bunch)
Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013
14
Summary ADT operation in 2012 was very smooth, routinely
switching between different modes and operating the feedback during the entire LHC cycle
2012 was devoted mainly to development of new features, modes of operation, studies and MDs
Additional pickups, large recabling campaign during LS1
New beam position and signal processing electronics
Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013
15
Summary New electronics allows to implement certain
features like instability trigger into the ADT Larger observation memories 256k 1-4Mpoints External observation boxes
Tune measurement Instability observation and analysis (those visible by
ADT) Allows heavy traffic without disturbing the system
We do our best, but “bunch-by-bunch everything” is not a specification that we can base a design on
A lot of work ahead – the design specs need to be frozen by May 2013!
Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013