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Transcript of Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 2013 1 Tevatron Collider at Fermilab.
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Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 2013
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Tevatron Collider at FermilabTevatron Collider at Fermilab
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Beam-Beam Effects Beam-Beam Effects in the Tevatron Collider :in the Tevatron Collider :
An OverviewAn Overview
Vladimir ShiltsevVladimir ShiltsevFermilabFermilab
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Tevatron TimelineTevatron TimelineJul 1983 Tevatron SC synchrotron commissioned,
reached world record 512 GeV (protons)
1982-1985 Antiproton source construction & commissioning, installation of the B0 low beta insertion magnets
Oct 1985 First 1.6 TeV c.o.m. p-pbar collisions in CDF
1987-1989 Collider Run at 1.8TeV c.o.m., magnet leads fix
1990 -1992 HV separators installed, new low beta insertions at D0 and B0 interaction regions
1992 -1993 Collider Run Ia at 1.8 TeV c.o.m.,both CDF & D0
1992 -1993 400 MeV Linac construction and commissioning
1994 -1996 Collider Run Ib, top quark discovery
1993 -1999 Main Injector construction and commissioning
2001 - 2011 Collider Run II, 1.96 TeV c.o.m.
Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 20133
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ContentContent• Beam-beam effects in Tevatron Collider Run I:
– First observations
– Helical orbits
– Preparations for Run II
• Collider Run II beam-beam themes:– Surprises with 36 bunches
– Fights for better separations and open apertures
– Beam-beam phenomena
– Theory and modeling
– Better beam diagnostics and machine “stabilization”
• Beam-beam compensation:– The idea and modifications
– Tevatron Electron Lenses and operation
– Compensation results
– By-product: collimation – longitudinal and transverse
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Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 20135
Beam-beam observations and effects during
Tevatron Collider Run I1989-19961989-1996
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First Effect – Importance of First Effect – Importance of ResonancesResonances
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Tevatron p – pbar collider, =0.005
D.Siergiej, PRE 55 (1997), 3521
D.Finley, ICFA BB (1989)
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Other effects and CountermeasuresOther effects and Countermeasures
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Countermeasure: Countermeasure: Installation HV separators
Eventually 24 (+- 150 kV over 5cm)
Vertical and HorizontalD.Finley, ICFA BB (1989)
In 6x6 bunch operationIn 6x6 bunch operationThere were 12 head-on 12 head-on collisionsObserved effects:Observed effects:•Emittance blowup for pbars•Transverse halo growth•Losses in both beams•Significant reduction in luminosity lifetime
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Thinking of 36x36 Thinking of 36x36 121x121 121x121 bunchesbunches
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P.Bagley, EPAC (1996)Expected (1997): Expected (1997): (a lot of antiprotons)
(very high luminosity x10 )
(high pile up)
Helical separated orbits
Long-range effects: Long-range effects: Orbit variation in trains
Tune variation in the trains
> Compensation by e-lenses
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Beam-beam effects during Tevatron Collider Run II
2001-20112001-2011(more pbars)(more pbars)
(more bunches 6(more bunches 636)36)(brighter pbars)(brighter pbars)
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Beam-Beam Effects in Tevatron Beam-Beam Effects in Tevatron
Loss in Low-
Beta squeeze: fixed by rearranging
separator voltages in
squeeze, so d/
increased from
1.82.7
on 150 GeV
helix
Mar 13, 2002
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Separated beams – Long-rangeSeparated beams – Long-rangeeffects at injection, ramp, squeeze effects at injection, ramp, squeeze
at injection
Diffusion on b-b aperture
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What we found empiricallyWhat we found empirically• Losses were dependent on :
• Therefore: focus on Separation, emittances, tunes:
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Decreased Q’ to ~3 and then to ~0 (new octupole circuits
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Beam-beam effects in CollisionsBeam-beam effects in Collisions
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Situation at Low-beta: ConfinementSituation at Low-beta: Confinement
7th order resonances:
Q=4/7=0.571 -
HIGH LOSSES
12th order resonances:
Q=7/12=0.583 -
Bad lifetime
5th order resonances:
Q=3/5=0.600 –
EMITTANCE BLOWUP
p
pbar
protonsantiprotons
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Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 2013
emittance ratio (_p/_a) ~3
Head-On Beam-Beam CollisionsHead-On Beam-Beam Collisionsaffected mostly protons
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Very High Proton Losses Early in StoresVery High Proton Losses Early in Stores
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Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 2013
Compare with total luminosity Loss rate of ~16-20%/hr
Intentional antiproton emittance blowup by 30-40% to reduce emm ratio (42.6) & p-loss
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Effect of * Chromaticity: Simulation Practical Implementation
C2=-16000C2=500by reconnect sextupoles
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Lifetime ConstituentsLifetime Constituents
• Emittance growth = >90% IBS + <10% Beam-Beam
• Pbar lifetime = (80-85)% burnup + ~15% LR Beam-Beam
• Proton lifetime = >50% Beam-Beam + <50 % burnup
• Hougrlass lifetime = >90% IBS + <10% Beam-Beam
IBS determined ~50-55% of lifetime
Burnup due to luminosity – another 30-35%
Beam-Beam Interaction reduces lumi- lifetime by 12-17 %Beam-Beam Interaction reduces lumi- lifetime by 12-17 %
11111 HpaL (9-11) + (16-18) +(25-45)+(70-80) =(5-5.5) hrs (9-11) + (16-18) +(25-45)+(70-80) =(5-5.5) hrs
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Total Beam-Beam Luminosity LossTotal Beam-Beam Luminosity Loss
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At the e
nd of Run II
At the e
nd of Run II
22-32% hit o
n Int.L
umi
22-32% hit o
n Int.L
umi
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What helped us to improve What helped us to improve BB-BB-situationsituation
• Injection, ramp, low-beta squeeze: Injection, ramp, low-beta squeeze: – Opened apertures (replaced magnets), increased helix– Q’ reduced: Transverse Dampers & Octupoles– Helix optimized (many times)– Emittances improved (thanks to injectors)
• At low beta (in collision stores)At low beta (in collision stores)– Use new separators, helix optimized (1st LR IPs)– Lower Q’, pbar blowup, tune stabilization– Chromatism of beta-function (Q”) greatly reduced
• (First ever?) trustable beam-beam simulations!(First ever?) trustable beam-beam simulations!• Operational Machine Stabilization:
– Stable intensities and emittances from injectors– Drastically stabilized Tevatron (see next)
• Outstanding development of beam diagnosticsOutstanding development of beam diagnostics– Tunes (3 instruments), emm (3), Intensity (3), lumi (2), BPMs
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Just Couple ExamplesJust Couple Examples• Orbit stabilization
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• Tune stabilization
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1.7GHz Schottky Tune Monitor1.7GHz Schottky Tune Monitor
• Q and 1-Q lines are seen
• Fit gives:
– Betatron frequencies
– dP/P sum of two widths
– C_vh difference of two
widths
– Emittance area under the
peaks
• Did that for each bunch !
• Very helpful software and
controls, fully incorported
in the ACNET
R.Pasquinelli P.Lebrun A.Jansson
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Beam-beam compensation:Beam-beam compensation:
Idea Realization (TELs)
ResultsBy-products (collimation
longitudinal and transverse)
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Beam-Beam Compensation IdeaBeam-Beam Compensation Idea
“…to compensate (in average) space charge forces of positively charged protons acting on antiprotons in the Tevatron by interaction with a negative charge of a low energy high-current electron beam “ (1997)
pe
pee
e
eyx
yx ace
rLJdQ
2
,
,
12
n
totpBB
Nr
4
electron beam
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Long-Range Beam-Beam CompensationLong-Range Beam-Beam Compensationvary the currents bunch-by-bunch in two e-lenses installed at βx≠ βy
e-beam
p-bars
Ie[A]
TEL1
TEL2
nbunch
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Some Facts on Electron LensesSome Facts on Electron Lenses
~4 mm dia 2 m long very straight beam of ~10kV
~1A electrons (~1012) immersed in 3T solenoid
generates strong radial electric
field E E ~ 0.3MV/m
26Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 2013
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Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 201327
Tevatron Electron Lens #1 (F48)
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TEL2 in the Tevatron Tunnel (A11)TEL2 in the Tevatron Tunnel (A11)
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Electron Charge DistributionElectron Charge Distribution
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Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 2013
Electron gunElectron gun
Shiltsev et al., PRL 99, 244801 (2007). Shiltsev et al., NJP 10, 043042 (2008).
G. Stancari, et al., (2011)Phys. Rev. Lett. 107, 084802
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Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 2013
TEL e-beam aligned and timed on protonsTEL e-beam aligned and timed on protons
in space in time
P12
P11P10P9
A24
TEL
Transverse e-p alignment is very important for minimization of noise effects and optimization of positive effects due to e-beam. Timing is important to keep protons on flat top of e-pulse – to minimize noise and maximize tune shift.
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Tuneshift dQTuneshift dQhorhor=+0.009 by TEL=+0.009 by TEL
Three bunches in the Tevatron, the TEL acts on one of them
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““Scallops” in Pbar Bunch EmittancesScallops” in Pbar Bunch Emittances95
% n
orm
aliz
ed v
erti
cal e
mit
tanc
e, p
i mm
mra
d
Bunch #
Too close to Qy=0.6
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Emittance Growth of A33 Suppresed by TELEmittance Growth of A33 Suppresed by TEL
Store #2540Store #2540
May 12, ‘03May 12, ‘03
A33
1 mm mrad/hr
-TEL on it
A21
2.2 mm mrad/hr
A9
4.1 mm mrad/hr
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TEL2 on One Proton Bunch P12TEL2 on One Proton Bunch P12
When TEL offoff:bunches #12 and #24have same lifetime of 8.7 hrshrs=11%/hr loss
When TEL onon:bunch #12 lifetime is ~2x #24 lifetime:17.4 hrs vs 10.0 hr
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By-products: e-Beam CollimationBy-products: e-Beam Collimation
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Hollow-e-beam Hollow-e-beam no EM field insideno EM field inside
Strong field outsideStrong field outside
Pulsed e-current Pulsed e-current in the abort gapin the abort gap
Drive out DC beamDrive out DC beam
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A word on complexity:A word on complexity:
compensationcompensation
beam-beam is tough
colliders are very complexcolliders are very complex
...but all are doable!
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The work of many:The work of many:• Beam-beam effects in the Tevatron Collider Run I:
– J.Annala, S.Assadi, P.Bagley, D.Finley, G. Goderre, D.A.Herrup, R.Johnson, J.Johnstone, E.Malamud, M.Martens, L. Michelotti, S.Mishra, G.Jackson, S. Peggs, S.Saritepe, D.Siergiej, P.Zhang
• Beam-beam effects in the Collider Run II:– Yu.Alexahin, J.Annala, D.Bollinger, V.Boocha, J.Ellison, B.Erdelyi, N.Gelfand,
B.Hanna, H.J.Kim, P.Ivanov, A.Jansson, A.Kabel, V.Lebedev, P.Lebrun, M.Martens, R.S.Moore, V.Nagaslaev, R.Pasquinelli, V.Sajaev, T.Sen, E.Stern, D.Shatilov, V.Shiltsev, D.Still, M.Syphers, A.Tollestrup, A.Valishev, M.Xiao
• Beam-beam compensation:– A.Aleksandrov, Y. Alexahin, L.Arapov, K. Bishofberger, A.Burov,
C.Crawford, V.Danilov, B.Fellenz, D.Finley R.Hively, V.Kamerdzhiev, S.Kozub, M.Kufer, G. Kuznetsov, P.Logatchov, A.Martinez, F.Niell, M.Olson, V.Parkhomchuk, H.Pfeffer, V.Reva, G.Saewert, V.Scarpine, A.Seryi, A.Shemyakin, V.Shiltsev, N. Solyak, G.Stancari, B.Sukhina, V.Sytnik, M. Tiunov, L.Tkachnko, A.Valishev, D.Wildman, D.Wolff, X. Zhang, F.Zimmermann, A.Zinchenko
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Holm
es, Moore, S
hiltsev 2011 JINS
T 6 T
08001
12 out 32 lu
minosity st
eps –
v
ia bea
m-beam w
ork
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SummarySummary• Beam-beam effects in the Tevatron turned from
“tolerable” (Run I) to “nightmare” (early Run II)
• The variety of effects was unmatched:– In both beams, at all stages of the cycle, LR and head-on
• The Tevatron team has been able to address them and provide critical contribution to more than 30- more than 30-fold luminosity increase fold luminosity increase by the end of Run II
• We also enriched beam physics by:– Experimental studies, theory & trustable modeling toolsExperimental studies, theory & trustable modeling tools– development of the electron lenses and first development of the electron lenses and first
demonstration of active beam-beam compensationdemonstration of active beam-beam compensation
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Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 2013 41
Please, don’t miss : Please, don’t miss : • Tue 9:30 Alex Valishev (Fermilab) Modeling beam-beam in the
Tevatron
• Tue 10:30 Alexey Burov (Fermilab) Beam-beam, impedance and damper
• Tue 15:00 Giulio Stancari (Fermilab) Measurements of the effect of collisions on transverse beam halo diffusion in Tevatron and LHC
• Tue 17:30 Vladimir Shiltsev (Fermilab)Experience with long range beam-beam effects in the Tevatron
• Wed 09:00 Giulio Stancari (Fermilab) Beam-beam compensation studies in the Tevatron
• Thur 08:30 Giulio Stancari (Fermilab) Detection of coherent beam-beam modes with digitized BPM
• Thur 14:00 Alex Valishev (Fermilab) Beam-beam for the HL-LHC
• Thur 15:00 Alexey Burov (Fermilab) Circular Modes
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Tevatron ParametersTevatron Parameters
Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 2013
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Complexity 0 APS, LCLS
Complexity 0.5 FNAL/MI
Complexity 1 B-factories
Complexity 1.5 eCool, HERA
Complexity 2 DCI/Orsay,80
Complexity 2 Tevatron,LHC
Complexity 2.5 B-B-Comps’n
Complexity of Beams in Complexity of Beams in loglog-Scale:-Scale:e-
e- e+
e-
p
p
p
pbar, pp
pbare-
e+
e-
e-
e+
43Vladimir Shiltsev - Beam-beam workshop, CERN - March 18, 2013