Beam-Gas Vertexing as an LHC diagnostics device: an overview

BGV meeting 12-Jun-2013 EPFL Massimiliano Ferro-Luzzi 1

Beam-Gas Vertexing as an LHC Beam-Gas Vertexing as an LHC diagnostics device: an overviewdiagnostics device: an overview

Motivation Concept Plamen will give details about design parameters (rates, acceptance, ,

etc.)

Organization More in Bernd’s talk


LHC emittance measurementLHC emittance measurement

Neglecting dispersion, the beam size is given by size

2 = where = X or Y (H or V)

optics function

emittance This is what is needed! = usually taken from machine model + optics measurements = measured from various devices:

– Wire Scanners (WS)

– Synchrotron light monitors (BSRT)

– Beam-gas ionization monitors (BGI)

– Luminosity scans

typical values of at LHC: 0.2 – 1 mm

typical values of at LHC: 0.2 – 1 mm


Current limitations of LHC emittance monitorsCurrent limitations of LHC emittance monitors

Wire Scanners (WS): cannot be used beyond a given intensity limit (depends on energy), wires break, movable device, not a continuous measurement, saturation effects (need to adjust PMT HV vs beam intensity).

Synchrotron light monitors (BSRT): absolute calibration is difficult, the source point moves during ramp, too small signal for ions at low energy, ...

Beam-gas ionization monitors (BGI): broadening of the profile due to too weak guiding field, distortion, difficult calibration, ...

Luminosity scans: must move the beams at the experiments, measures a convolution of two beam emittances, takes times, ...


LHCb as a demonstrator of beam-gas imagingLHCb as a demonstrator of beam-gas imaging


See Plamen’s talk at recent WorkshopSee Plamen’s talk at recent Workshop9th DITANET Topical Workshop on Non-Invasive Beam Size Measurement for High Brightness Proton and Heavy Ion Accelerators, 16 April 2013

Can do also: full transverse profiles (not just RMS), ghost charge, relative bunch chargesNon intrusive! No beams moved !

Can do also: full transverse profiles (not just RMS), ghost charge, relative bunch chargesNon intrusive! No beams moved !


Proposal to use BGV at LHCProposal to use BGV at LHC

Phase 1: BGV demonstrator at LHC ring2 (LS1)– make a sequence of measurements, bunch-by-bunch, during the ramp

Phase 2: build a full-blown BGV for each LHC ring (LS2)

Later ... other accelerators ?

«collaboration» required: BE-BI, TE-VSC, PH, EPFL, Aachen

Proposal presented at LMC 164 (27/3/2013):... «Steve Myers summarized that in principle the LMC agreed that this was a very important, useful piece of equipment. Frederick Bordry invited Plamen Hopchev and Rhodri Jones to come to the LSC meeting on Friday morning to check the full impact .»

Also presented to and supported by HL-LHC committee.

Proposal presented at LMC 164 (27/3/2013):... «Steve Myers summarized that in principle the LMC agreed that this was a very important, useful piece of equipment. Frederick Bordry invited Plamen Hopchev and Rhodri Jones to come to the LSC meeting on Friday morning to check the full impact .»

Also presented to and supported by HL-LHC committee.


Passed milestonesPassed milestones

2013-03-18: HL-LHC Technical Committee– The demonstrator BGV project is approved and funded by HL-LHC

2013-03-27: Lhc Machine Committee Slides– LMC approves continued development of the monitor

– LMC states that amount of work done in LS1 will depend on impact on the schedule & other Groups

2013-05-17: Long Shutdown Committee Slides– Presented the project and the space-reservation request

– Request accepted 2013-06-04: LHCb Technical Board

– LHCb accepts to provide spare equipment if available in sufficient quantities

More milestones to be defined... ( =>Bernd’s talk)


Who is BGV ? Who is BGV ? (in random order apart from (in random order apart from PhD studentsPhD students dedicated to BGV) dedicated to BGV)

LPHE:

Guido Haefeli

Mark Tobin

Frederic Blanc

Raymond Frei

Aurelio Bay

Tatsuya Nakada

Bernard Florian

...

Aachen:

Thomas Kirn

Stefan Schael

...

CERN/BE:

Maria Kuhn

Quentin Veyrat

Plamen Hopchev

Enrico Bravin

Bernd Dehning

Ray Veness

Nicolas Chritin

Giuseppe Bregliozzi (TE)

Benoit Salvant

...

CERN/PH:

Mariana Rihl

Rosen Matev

Colin Barschel

MFL

Richard Jacobsson

Jaap Panman

...

to be further developed/defined/formalized...to be further developed/defined/formalized...


Demonstrator: gas target sketchDemonstrator: gas target sketchgas injection and accumulation

pumping pumping

WF suppression

detector

detector

long (small diameter) pipes act as flow restrictions

ideal pressure profile

z

p

more realistic pressure profile

this must be transparent! (thin)

beam

Reminder: contrary to VELO/LHCb, here gas injection must be continuous (with beam)... Consider impact on machine!Reminder: contrary to VELO/LHCb, here gas injection must be continuous (with beam)... Consider impact on machine!

to be optimized:ratio of useful/total gas integralto be optimized:ratio of useful/total gas integral


storage

Demonstrator: gross conceptDemonstrator: gross concept

FE electronics

Readoutsupervisor

trackingdetectors timing/trig

detectors

readoutboards

gas target

readoutnetwork

CPU farm

Shielded area

LHC tunnel

LHC clockdata

(max 1MHz) trigger

Use SciFi/SiPM !Use VELO-like readout (Beetle to Tell1).

Raw gas rates: 50Hz/1011p per meter of 6.4x10-8 mbar NeHence:- full beam (3x1014p)- full gas length (5m)0.75MHz raw rateShould stay <1MHz!!simple activity trigger

Evt size = ~ 17 bits/clus * 10 clus/plane/Evt * 8 planes = 0.2 kB/Evt0.2 kB/evt * 1 kEvt/s = 0.2 MB/s0.2 MB/s * 107 s = 2 TB/year may need to think about nano events...

High Level Trigger: 1 MHz input rate thlt = avge time to take HLT decisionNcpu = nr of CPU cores available in HLT = 100We need to achieve thlt < Ncpu / RL0 = 0.1 ms

Aim: about 200 good events per 1e11p bunch in a few minutes => need about 1Hz good events per nominal bunch


VME 9U

VME 6U

VME 9U

detector DAQ / CTRL (VELO like)detector DAQ / CTRL (VELO like)

FE board

drv drv LVreg

ECS

HV1 per SiPM ?

x8x8

x8x8

TELL1ADC

drv

ADC

ADC

x8x8

CTRL

Gbit nw to CPUs

READOUTSUPERVISOR

SPECS slave

designed for ~kGy krad «no radiation»

voltage supply

ctrl/trig

data

ADC

copper, analog

patch

4 Beetles per drv

TTCTTCex

1m

25m(L>25m must be tested)

60m

drvcould be th

e

same crate LHC clock

Zero suppressionZero suppression

L0 trig

LV

L0 detector signals

max

6 F

E b

oard

sm

ax 6

FE

boa

rds

controlPCSPECS

MASTER

SciFi mattress SiPM

SiPM

SiPM

Beetle

Beetle

Beetle

SiPMBeetleSciFi mattress

SiPM

SiPM

SiPM

Beetle

Beetle

Beetle


SiPM

SiPM

SiPM

Beetle

Beetle

Beetle


SiPM

SiPM

SiPM

Beetle

Beetle

Beetle

SiPMBeetle

x2x2


detector side of readout chaindetector side of readout chain

example here from VELO Zap test (PS booster 2009) Reminder:

1 drv card = 1 data cable = 4 Beetles

Repeater (FE) boardRepeater (FE) board

Analog data cablesAnalog data cables

Control/trig cableControl/trig cable

here only 2 out of 4

here bricolaged from two CAT6 cables

Temperatures cableTemperatures cable

here only 2 out of 4 driver cards

LVregLVreg

drvdrv

ECS mezzanineECS mezzanine

LV and HVLV and HV


Ctrl & Readout systemCtrl & Readout system

will more or less look like this:

(here a picture from the VELO assembly lab)

For BGV, we need:

8 equiped TELL1s

1 crate (Tell1 9U)

2 CTRL boards

8 equiped RPT boards

1 ODIN + Cu2Opt

ODINODIN

temperatures boardtemperatures board

CONTROL boardCONTROL board

TELL1sTELL1s

Copper2OpticalCopper2Optical

Analog cablesAnalog cables


Location: ring 2 , left of IP4Location: ring 2 , left of IP4

~10m~10m

beam 2AA

CC

BB

Detector

Rack

Rack

Approximate distances: A-B = 20m, B-C = 25m Location B for DAQ/CTRL would be better: shorter cables, cheaper (maybe we

have most cables already!) and no uncertainty about CTRL board cable lengths... Can we merge C into B ?? In fact, anywhere in the pink area would be OK (<25m)

Location D: power outlet ? E: network connections ?

D ?D ? power outlets E ?E ? IP connections


Tunnel space (about 222m left of IP4)Tunnel space (about 222m left of IP4)

ring2ring2ring1ring1

IP4IP4


Global time lineGlobal time line

Anything that cannot be installed in a short technical stop, should be installed in LS1 !

More in Bernd’s talk

20132013 20142014 20152015

Design studies / specs

Production/testing

Installation

Commissioning

Sep: BGV ECR (technical design)

Jun: end of (heavy) work in tunnel

Feb: Beam ?


Work packages and coordinationWork packages and coordination

Today: agree on WP & Coordinators Next step: define subtasks, names of responsibles, and milestones

Vacuum systemBE / Bernd Dehning

Detector modulesEPFL / Aurelio

Bay ?

Control & MonitoringBE / Plamen Hopchev ?

Cooling R&D/design

EPFL / Aurelio Bay ?

Mechanical support

BE / Ray Veness ?

Global Coordination

BE / Bernd Dehning& Plamen Hopchev

SciFiAachen / Thomas

?

Btl PCBEPFL / Guido

Module designEPFL / Guido ?

...

Physics softwareBE / Plamen

Hopchev

Trig/DAQPH / MFL

... cooling /services ?cooling /services ?

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Beam-Gas Vertexing as an LHC diagnostics device: an overview

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