Transcript No Slide Title

Critical Review of US-LARP activities
on accelerator systems
Based on contributions for/by:
• IR upgrade studies, beam-beam compensation, e-cloud simulations:
Oliver Bruening, Werner Herr, Frank Zimmermann
• Beam Instrumentation: Rhodri Jones
• Collimation: Ralph Assmann
• Beam Commissioning: Roger Bailey
H.Schmickler, LTC 26-9-2006
Outline
• 2006 = 1st year of full US-LARP funding
• Time for a critical review:
- accelerator systems: LTC 27th of September
- magnet R&D, hardware commisioning:
Special AT meeting on 4th of october
 feedback to collaboration meeting
(end of October, close to BNL)
• Information on LHC@FNAL and LAFS
• Sensitive issue: Payment of US collaborators (PJAs)
• Detailed technical feedback
• Conclusions
H.Schmickler, LTC 26-9-2006
LHC@FNAL
• New bilateral collaboration FNAL – CERN in
order to build and operate a CCC copy at FNAL
• Initiative by FNAL (Erik Gottschalk et al.)
originally motivated for remote operation of LHC
experiments
• Extended to accelerator control now
• Remote Operation and diagnostics has been part
of LARP conceptual mandate in the beginning;
dropped for low priority.
• LHC@FNAL very active; leads to PJAS at
CERN; contributing to LHC controls; work
supervised by Mike Lamont and Pierre Charrue
H.Schmickler, LTC 26-9-2006
LAFS (= LHC Accelerator Fermilab Software?)
• Newly proposed bilateral collaboration FNAL-CERN
• Collaboration agreement on the desks of the big chiefs
• Will make available for controls/operational software
efforts up to ten PJAS (a bit optimistic…)
• Today focus of work:
- Role based access
- Sequencing
- Snap Shot Analysis Software (Tevatron Operations Tool)
• Work defined by Mike Lamont, Eugenia Hatziangeli,
Pierre Charrue
• Team at FNAL: Dave McGinnis et al.
H.Schmickler, LTC 26-9-2006
PJAS at CERN
• Very sensitive issue: US –PJAS will come to work at CERN based
on several different collaboration agreements
- US-LARP, LAFS, LHC@FNAL, others…
• In terms of payment they should all be treated the same;
i.e. salary by home institute + 4 (5) ksfr/month extra allowance
• The collaboration agreements are different:
1) LAFS and LHC@FNAL: PJAS allowance paid by CERN
2) US-LARP: PJAS funding (mainly for beam commissioning or
subsystem commissioning) is part of US-LARP commitment!
CERN does NOT pay PJAS allowance
3) EXTRA resources demanded by CERN for hardware
commissioning: LARP has proposed itself for organization of this
help; CERN pays PJAS allowance!
• We have to get this clear, otherwise we end up in a big mess.
H.Schmickler, LTC 26-9-2006
Feedback on USLARP Collaborations
LHC IR upgrade studies:
 mainly organized through the CARE / ESGARD HHH network
 main deliverable: optics solutions for new IR layout
 USLARP is mainly involved in Ni3Sn upgrade studies which
are based on the nominal LHC layout  no new optics required
 main contribution was the proposal for flat beam operation at
LUMI’05 in Archidosso (however, follow-up optics studies
were carried out at CERN)
 other deliverables: magnetic TAS:
 very little progress after 3 years of discussion!
 right now all collaborators seem to mainly follow their own agenda
 the collaboration could clearly benefit from better coordination!
LTC; 27.9.2006
AB-ABP Feedback
6
Feedback on USLARP Collaborations
LHC optics and commissioning studies:
 mainly organized through direct contacts between CERN & LBNL
 main deliverables:
 diagnostics tools (procedures) for measuring b-beat in the LHC (% level)
 proposal for correction algorithm based on measurements
 collaboration works well and first results have been discussed in the LHCCWG
at CERN.
 collaboration benefits greatly by ‘on site’ residence of a USLARP
Toohig fellow  facilitates communication and prepares an eventual active
USLARP contribution to the LHC commissioning
 Toohig fellow will also participate now in LUMI’06 workshop before the return
to BNL
LTC; 27.9.2006
AB-ABP Feedback
7
Feedback on USLARP Collaborations
electron cloud studies:
 mainly organized through direct contacts between CERN & LBNL & BNL
 main deliverables:
 independent simulation tool to the code that has been developed
at CERN  cross check and confidence in simulation results
 perform simulation studies for the LHC at LBNL
 outsourcing (only 0.2 FTE working on e-cloud at CERN)
 USLARP to specify best conditioning scenario during startup
little results in ‘03 / ’04 but bug fixes and new results in ’05 / ‘06
 measurements in RHIC and simulations at BNL
 provides network for studying e-cloud effects in existing machines
 collaboration provides USLARP with insight into effect at LHC and helps
during preparing active USLARP support during LHC commissioning
LTC; 27.9.2006
AB-ABP Feedback
8
e-cloud heat load in LHC dipole with old & new POSINST
w/o re-diffused e- and ECLOUD result (Miguel Furman)
OLD POSINST
w/o rediffused
ECLOUD
LTC40
NEW POSINST
w/o rediffused
note:
re-diffused
electrons
increase
heat load
~2x
cooling capacity
at low & high L
Feedback on USLARP Collaborations
beam-beam studies (simulation and theory):
 mainly organized through direct contacts between CERN & LBNL
 main deliverables:
 collaboration on beam-beam simulations with LBL (J. Qiang and
M. Furman) on strong-strong simulations on coherent effects and
emittance growth.  Same programs are used for RHIC studies.
 studies showed potential problem for partially overlapping beams
Results have been quantitatively confirmed with other programs.
 studies now extended to commissioning and beam finding scenarios,
including runs with low luminosity (i.e. 450 GeV)
 exchange of results and discussions on regular basis
LTC; 27.9.2006
AB-ABP Feedback
Feedback on USLARP Collaborations
beam-beam studies (simulation and experiments):
 mainly organized through direct contacts between CERN & LBNL & FNAL
 main deliverables:
 experimental and simulation setup for long range beam-beam
collision compensation using wires at RHIC in BNL:
 compensation of single LR collision in RHIC MDs in ’05/‘06
 simulation of 60-120 lumped LR collisions in measurement using wires
 compensation with two BBLRs for beams colliding head on
 explore & demonstrate feasibility of LR compensation for
implementation in the LHC.
 collaboration works well and first RHIC MD results have been discussed with
CERN. However, usefulness of RHIC set-up (only one long range collision point
and scalability to LHC is not obvious).
LTC; 27.9.2006
AB-ABP Feedback
11
Long-range beam-beam
effect
in
• LR at s=10.6m
on in Yellow
RHIC at 100 GeV •• Octupoles
Blue beam moved
measurement of losses vs.
separation (Wolfram Fischer)
beam-beam simulation for RHIC experiment (Ji Qiang):
emittance growth vs. tunes for different separations
5s separation
4s separation
6s separation
US-LARP Instrumentation Packages
Instrumenting the TAN – Luminosity monitors for IR1 and IR5
• Started with LBNL as part of the
US-LHC construction project
 Initial R&D very promising
 Problems with US-LARP budget
approval slowed things down
considerably a few years ago, along with a lack of CERN
manpower for effective follow-up.
 Due to this, CERN limits collaboration with LBNL to luminosity
and longitudinal profile monitoring is abandoned
 Recent injection of new manpower by LBNL and a pressing
installation schedule have served to advance the project
significantly
 It does now look as if the deliverables will be installed just in time
US-LARP Instrumentation Packages
Tune, Coupling and Chromaticity Feedback – BNL & FNAL
• Started as bilateral agreement between
CERN & BNL – later integrated into
LARP with additional support from FNAL
 Original deliverable was for complete PLL tune system
• Was never really viable for such a critical LHC system
• New system (BBQ) is CERN designed and built, but based on the lessons learned
from the RHIC system
 Testing of this system at both RHIC and Tevatron has been invaluable in the
continued development of the system.
 Understanding the effect of coupling on the PLL and its subsequent
measurement at RHIC was a major leap forward.
 RHIC has now successfully tested both tune and coupling feedback using a
CERN BBQ front-end
 Both parties currently working on demonstrating chromaticity feedback
 This has been a very positive collaboration which will hopefully ensure that
the LHC starts up with a viable PLL tune meter capable of being used for
tune, chromaticity and coupling feedback.
US-LARP Instrumentation Packages
LHC Schottky monitoring – FNAL
• Accepted as part of LARP in October 2006
 A strong driving force both on the CERN side
(Fritz Caspers) and FNAL side (Ralph
Pasquinelli) has ensured that 4 Schottky
monitors are now being assembled for
installation at CERN next month
 This has been a model collaboration with both
sides open to new ideas while working towards
a common goal.
• Time was invariably helped by the very tight
time constraints imposed on the project!
• General Remarks on all US-LARP instrumentation packages
 Role of beam commissioners needs to be clarified between labs & LARP
• Who can come, for how long and when
 Support is required for the software integration of these systems
• Who does what still to be clarified between LHC@FNAL / BI / CO
Status of LARP Activities on Collimation
SLAC – Phase 2 collimator for LHC
beam tests: Work proceeding well.
Dedicated SLAC work force increased.
Cutting metal at SLAC.
FNAL – Study tertiary collimators
(TCT) IR1/IR5: After initial delays and
complaints recently results presented
for IR5. Confirms TCT design choices
 gain factor 5-10. Completed once
IR1 is done.
http://www-project.slac.stanford.edu/ilc/larp/
Work driven through monthly video meetings
BNL – CERN – FNAL – SLAC!
Talks and info on web site (see above).
US coordination: T. Markiewicz, SLAC
BNL – Radiation tests for collimator
materials: Important experimental
radiation data for CFC material. Good
news on radiation resistance though
damage concern remains.
BNL – Comparison RHIC loss maps
with predictions: Very limited
progress. CERN doctoral student (G.
Robert-Demolaize) will join BNL/RHIC
on January 1st. Continue work…
SLAC Collimator Design and Prototyping:
Rotatable LHC Collimator
Strong SLAC commitment and effort:
Design with 2 rotatable Cu jaws
Theoretical studies, mechanical design,
prototyping.
New full time mechanical engineer hired.
Looking for SLAC post-doc on LHC collimation!
First prototype with helical cooling circuit
(SLAC workshop)
Collimator Infrastructure @ SLAC in Construction
The “clean tent”
Next steps @ SLAC:
Assembly of prototype jaw.
Heating (20 kW) and cooling test.
Deformation tests.
Support table
Cooling
Heating and power
Instrumentation
FNAL: IR1/5 Radiation from Beam Halo with TCT’s
Peak power density in Q3 SC coils: 6.e-5 mW/g
Peak absorbed dose: a few kGy/yr
Peak residual dose: 7 mSv/hr
Many more results (heating in SC triplet magnets, radiation, IR5 background):
http://www-project.slac.stanford.edu/ilc/talks/larp/2006-08-23/mokhov-tct-aug06.ppt
 IR1 to be done to complete job. Use CERN/FLUKA set-up for LHC operation!?
BNL: Radiation Tests on Collimator Materials
1020 p shot on CFC collimator material (phase 1):
1) Good radiation resistance!
2) Damage!
Dose much higher than yearly dose on most
exposed LHC collimators (~1016 p/year).
Work to extrapolate to LHC losses (FLUKA team).
Further work ongoing/planned for phase 2 materials.
Serious DAMAGE of 2D CFC after
heavy irradiation exposure
View from the CERN Side
LARP collimation activities focus internationally available expertise on LHC
collimation, are useful for CERN and are productive:
SLAC: Phase 2 prototype collimator for LHC beam tests in 2008 or 2009! SLAC is working
very persistently and is dedicated (hiring of additional staff). Cutting metal at SLAC…
FNAL: Beam loss and radiation studies in IR1 and IR5 give important insights for study of
tertiary collimators and background. After some delays and complaints very good results are
now presented. Important reference data for LHC operation.
BNL: Tests of material make use of a unique radiation facility for test and analysis at BNL.
Important reference data for LHC operation and for improving with phase 2 materials.
BNL: Beam loss maps for RHIC have been recorded. Limited progress in analysis and
comparison with simulation. Work reinforced as a core member of the CERN collimation
team joins BNL/RHIC after completion of his PhD.
Issues:
Agree to complete and finish FNAL studies after results are available? Requires to put CERN
resources for setting up IR1 and IR5 FLUKA models. Gain in terms of fast reaction time to
possibly critical IR issues!
LTC Sep 27th 06 : LHC commissioning organisation
R.Bailey
M.Lamont
G.Arduini
Machine Coordinator
Weekly responsibility
3 needed
O.Bruning
P.Collier
R.Assmann
M.Giovannozzi
S.Fartoukh
J.Uythoven
Commissioner
Scheduled shifts years 1,2
Pool of at least 7 needed
Accelerator Systems
As required
Defined responsibilities
J.Wenninger
F.Zimmermann
A.Butterworth
Accelerator system
Accelerator system
Accelerator system
Accelerator system
Accelerator system
Activity 1
Activity 2
Activity n
S.Redaelli
01.06
M.Gruwe
01.06
R.Alemany
08.06
L.Ponce
08.06
W.Venturini
01.07
EIC6
04.07
EIC7
04.07
EIC
Scheduled shifts long term
7 needed
M.Albert
G.Crockford
R.Giachino
G.H.Hemelsoet
Operator
Scheduled shifts long term
7 needed
D.Jacquet
L.Normann
F.Pirotte
A.Rey
R.Suykerbuyk
E.Veyrunes
Technical Services
Take
As
Given
Hardware Commissioning
Develop
These
Beam Commissioning
Accelerator systems
Contact
TI operations
P.Sollander
Controls
H.Schmickler
Electrical supply
J.Pedersen
Cooling and ventilation
J.Inigo-Golfin
Access & safety systems
T.Pettersson
Cryogenics
L.Serio
Main Ring Magnets Performance
A.Siemko
Insertion Magnets Performance
R.Ostojic
PIC
B.Puccio
QPS
K.H.Mess
Power converters
F.Bordry
Beam vacuum
N.Hilleret
Magnetic Optics Commissioning
J.P.Koutchouk
Beam Machine Protection Systems
R.Schmidt
Radiation Protection
D.Forkel-Wirth
Radiation Monitoring
T.Wijnands
Beam Transfer
V.Mertens
OK
RF
T.Linnecar
OK
Beam Instrumentation
R.Jones
OK
Collimation
R.Assmann
High level controls
M.Lamont
Operational phases
R.Bailey
Accelerator physics
O.Bruning
Experimental Conditions
H.Burkhardt
OK
OK
US LARP involvement

No involvement in core team working 24/7 in the CCC

Interest expressed in many Accelerator Systems

Mostly




AP, BI (see slides)
Controls (not LARP, but rather LHC@FNAL)
Collimators
And a little on



Beam transfer
Snapback, ramp, squeeze
Machine protection

So nearly all covered by other LARP chapters

Our present scheme does not explicitly have a pool of
experienced people for general troubleshooting


Perhaps this is something that we need
If so this is a role where the right US staff could contribute
Beam Instrumentation – R.Garoby, R.Jones
Activity
Responsible
Other CERN
Screens
E.Bravin
A.Guerrero
H.Burkhardt (AP)
G.Arduini (AP)
BCT
P.Odier
D.Belohrad
M.Ludwig
H.Burkhardt (AP)
J.Jowett (AP)
BPM and orbit
R.Jones
L.Jensen
J.Wenninger (OP)
W.Herr (AP)
I.Papaphilippou (AP)
BLM
B.Dehning
E.Holzer
S.Jackson
L.Ponce (OP)
R.Assmann (AP)
H.Burkhardt (AP)
B.Jeanneret (AP)
S.Gilardoni (AP)
PLL for Q, Q’, C
R.Jones
M.Gasior
P.Karlsson
S.Fartoukh (AP)
O.Berrig (AP)
J.Wenninger (OP)
C.Y.Tan
P.Cameron
Profile monitors
S.Hutchins
J.Koopman
A.Guerrero
H.Burkhardt (AP)
S.Gilardoni (AP)
M.Giovannozzi (AP)
A.Jansson
Schottky monitors
F.Caspers (RF)
R.Jones
S.Bart-Pedersen
E.Metral (AP)
C.Carli (AP)
F.Zimmermann (AP)
R.Pasquinelli
A.Jansson
Luminosity monitors
E.Bravin
S.Bart-Pedersen
R.Assmann (AP)
F.Zimmermann (AP)
Toohig Fellow
LARP
Accelerator physics – O.Bruning
Activity
Responsible
Optics
O.Bruning, S.Fartoukh
M.Giovannozzi, W.Herr
T.Risselada
Y.Papaphilippou
V.Ranjibar
M.Syphers
A.Jansson
Beta beating
M.Giovannozzi
R.Tomas Garcia
R.Calaga
Aperture
B.Jeanneret, W.Herr
F.Schmidt, F.Zimmermann
Y.Papaphilippou
E.Harms
Toohig fellow
Impedence
F.Ruggiero
E.Metral, F.Zimmermann
Toohig fellow
Other CERN
LARP
Lattice correctors
S.Fartoukh, F.Schmidt
Y.Papaphilippou
M.Martens
M.Syphers
V.Ranjibar
Triplet correctors
S.Fartoukh, F.Schmidt
T.Sen, M.Syphers
Lifetimes
J.Jowett, F.Zimmermann
X.Zhang
Separation / Crossing
W.Herr, F.Zimmermann
Y.Papaphilippou
Collisions and beam-beam
W.Herr, R.Assmann
Luminosity
W.Herr, R.Assmann
H,Burkhardt
R.Moore, J.Annala
E.Harms
Summary (1/3)



Administartion problem of PJAS payment to be
communicated (again) and to be respected in all
branches of the collaboration.
New initiatives (LHC@FNAL, LAFS) popping up.
These are well matched to the immediate needs of
the LHC.
New US-LARP collaboration proposals as discussed
during / after the collaboration meeting of April 2006
(LTC) found by far less enthusiastic CERN reactions.
For US-LARP to rethink its strategy…
US-LARP is receptive for criticism and the proposal
of corrective measures: example: collimation
simulation studies at FNAL, engineering approach
for luminosity monitors at LBL…
Summary (2/3)







LHC IR upgrade studies: Better Coordination required
E-Cloud simulations: Positive results, Should be
maintained at that low level of effort
B-B compensation: Completely unclear if work in the
US at RHIC is relevant for LHC: Should be worked out
in a review
B-B simulations: Good results
LHC lumi monitors: Reduced Scope (IP1 and IP5 only),
good progress to deliver in time.
Tune and Chromaticity feedback: Good results,
technology driven by CERN, active collaboration
Schottky Monitors: Good progress due to strong
engagement on CERN and FNAL side.
Summary (3/3)



In general all BI: Software design, coding and testing
not defined. Needs to be done now in collaboration
with AB-CO and AB-OP.
4 different labs involved in collimation activity
…working pretty well.
Beam Commissioning: Long iterations for the past 2
years. Present US-LARP involvement/commitment
only on present collaboration items.
From CERN the future LHC operations teams are well
defined and slots/roles are made available for outside
collaborators. US-LARP has to manifest further
interest now.