adt what could be delivered plans for ls1 and beyond

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


Q9

Analogue output to the power amplifiers

Digital signal processing unit

DAC

Gain control (CCC)

CLEANING

Sequential observation

(Multiturn app.)


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


Q7

Pickup Q9


Q9

Analogue output to the power amplifiers


DAC

Gain control (CCC)

CLEANING

Sequential observation

(Multiturn app.)


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


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Tune measurement testsTune measurement with active kicking of the first 6 (witness) bunches with full ADT gain. Horizontal plane, Beam 1, 12.8.2012.


“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


Q7

Pickup Q9


Q9 Analogue output to the power amplifiers


DAC

Gain control (CCC)

CLEANING

DAC

Pickup Qx


Qx

Pickup Qx


Qx

DACBeam transfer function meas.

Observation box

Tune/instability

diagnostics box

Fast b-by-b Instability

diagnostics

CCC, users, logging


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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


Q7

Pickup Q9


Q9 Analogue output to the power amplifiers


DAC

Gain control (CCC)

CLEANING

DAC

Pickup Qx


Qx

Pickup Qx


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


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


mb = 25

mb = 52

mb = 127

mb = 138

mb = 38

mnew new existing existing

B2 horizont

al


mb = 17

mb = 60

mb = 173

mb = 106

mb = 30

mnew new existing existing

B2 vertical


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

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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)


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


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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!


adt what could be delivered plans for ls1 and beyond

Documents

adt gain

lhc damper

functional requirements

transverse feedback

tune extraction

lowered gain

analogue gain

reduced gain