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M.E. Biagini,
R. Boni,
M. Boscolo,
B. Buonomo,
T. Demma,
A. Drago,
S. Guiducci,
S. Liuzzo,
G. Mazzitelli,
L. Pellegrino, [......],
J.M. De Conto,
Y. Gomez,
N. Monseu,
D. Tourres,
C. Vescovi,
A. Chance,
S. Bettoni,
B Bolzon,
M. Esposito,
Y. Zhang
2nd International Particle Accelerator Conference: IPAC 2011, San Sebastian, Spain; 09/2011
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S. Guiducci,
M.E. Biagini,
R. Boni, M.A. Preger,
O. Dadoun,
P. Lepercq,
C. Rimbault,
P.Raimondi,
J. Brossard,
A. Chancé,
A. Variola,
J. T. Seeman
[show abstract]
[hide abstract]
ABSTRACT: The ultra high luminosity B-factory (SuperB) project of INFN requires a high performance and reliable
injection system, providing electrons at 4 GeV and positrons at 7 GeV, to fulfill the very tight requirements of
the collider. Due to the short beam lifetime, continuous injection of electrons and positrons in both High Energy Ring (HER) and Low Energy Ring (LER) is necessary to keep the average luminosity at a high level. An updated version of the injection system, optimized at higher repetition frequency is presented. This scheme includes a polarized electron gun, a positron production scheme with electron/positron conversion at low energy 0.6 GeV, and a 1 GeV damping ring to reduce the injected emittance of the positron beam.
IPAC 2011; 01/2011
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M Zobov,
D Alesini,
M E Biagini,
C Biscari,
A Bocci,
R Boni,
M Boscolo,
F Bossi,
B Buonomo,
A Clozza, [......],
V Smaluk,
N Arnaud,
D Breton,
L Burmistrov,
A Stocchi,
A Variola,
B F Viaud,
S Bettoni,
K Ohmi,
D Teytelman
[show abstract]
[hide abstract]
ABSTRACT: The electron-positron collider DAPhiNE, the Italian Phi factory, has been recently upgraded in order to implement an innovative collision scheme based on large crossing angle, small beam sizes at the crossing point, and compensation of beam-beam interaction by means of sextupole pairs creating a "crab-waist" configuration in the interaction region. Experimental tests of the novel scheme exhibited an increase by a factor of 3 in the peak luminosity of the collider with respect to the performances reached before the upgrade. In this Letter we present the new collision scheme, discuss its advantages, describe the hardware modifications realized for the upgrade, and report the results of the experimental tests carried out during commissioning of the machine in the new configuration and standard operation for the users.
Physical Review Letters 04/2010; 104(17):174801. · 7.37 Impact Factor
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M. E. Biagini,
R. Boni,
M. Boscolo,
B. Buonomo,
T. Demma,
A. Drago,
M. Esposito,
S. Guiducci,
G. Mazzitelli,
L. Pellegrino, [......],
Y. Gomez,
F. Meot,
N. Monseu,
D. Tourres,
C. Vescovi,
A. Chancé,
O. Napoly,
D.P. Barber,
S. Bettoni,
D. Quatraro
arxiv. 01/2010;
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C. Milardi,
D. Alesini,
M.E. Biagini,
C. Biscari,
A. Bocci,
M. Boscolo,
F. Bossi,
B. Buonomo,
A. Clozza,
E. Di Pasquale, [......],
M. Esposito,
P. Branchini,
P. Valente,
B.F. Viaud,
S. Bettoni,
K. Ohmi,
D. Teytelman,
G. Delle Monache,
T. Demma,
V. Smaluk
[show abstract]
[hide abstract]
ABSTRACT: In 2007 DAFNE was upgraded to operate in a regime of large Piwinski angle, with a novel interaction region optics, reduced vertical beta at the interaction point, and additional sextupoles providing for Crab-Waist collisions. The specific luminosity has been boosted by more than a factor of four at low currents, and the present peak luminosity is by about a factor of 3 higher than the maximum value obtained with the original collider configuration. The DANE commissioning as well as the first experience with large Piwinski angle and Crab-Waist collisions scheme will be reported.
Particle Accelerator Conference (PAC 09), Vancouver, BC, Canada; 05/2009
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[show abstract]
[hide abstract]
ABSTRACT: Long-range beam-beam interactions (parasitic crossings) were one of the main luminosity performance limitations for the lepton F-factory DAFNE in its original configuration. In particular, the parasitic crossings led to a substantial lifetime reduction of both beams in collision. This puts a limit on the maximum storable current and, as a consequence, on the achievable peak and integrated luminosity. In order to mitigate the problem, numerical and experimental studies of the parasitic crossings compensation by current-carrying wires have been done. During the operation for the KLOE experiment two such wires have been installed at both ends of the interaction region. They produced a relevant improvement in the lifetime of the weak beam (positrons) at the maximum current of the strong one (electrons) without luminosity loss, in agreement with the numerical predictions. The same compensating mechanism has been adopted during the run for the FINUDA experiment as well, with less evident benefits than in the previous case. The interplay between nonlinearities originating from the beam-beam interaction and the ring lattice has been studied by theoretical simulation and experimental measurements. Compensation procedures have been set up relying on the electromagnetic octupoles installed on both rings and used in addition to wire compensation. In this paper the parasitic crossings effects in the DAFNE interaction regions and their compensation by wires and octupoles are described. A detailed theoretical analysis of the interplay about different non-linearities is presented; eventually experimental measurements and observations are discussed.
04/2008;
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[show abstract]
[hide abstract]
ABSTRACT: Long-range beam-beam interactions (parasitic crossings) are one of the main luminosity performance limitations for the Frascati e+e- Phi-factory DAFNE. In particular, the parasitic crossings lead to a substantial lifetime reduction of both beams in collision. This puts a limit on the maximum storable current and, as a consequence, on the achievable peak and integrated luminosity. In order to alleviate the problem numerical and experimental studies of the parasitic crossings compensation with current-carrying wires have been performed at DAFNE. Two such wires have been installed at both ends of the KLOE interaction region. Switching on the wires in agreement with the numerical predictions, improvement in the lifetime of the 'weak' beam (positrons) has been obtained at the maximum current of the 'strong' one (electrons) without luminosity loss. In this paper we describe the parasitic crossings effects in DAFNE, summarize the results of numerical simulations on their compensation with the wires and discuss the experimental measurements and observations. Comment: Poster presented to European Particle Accelerator Conference (EPAC'06), Edinburgh, Scotland, 26-30 June 2006
07/2006;
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C. Biscari,
D. Alesini,
G. Benedetti,
M.E. Biagini,
R. Boni,
M. Boscolo,
A. Clozza,
G. Delle Monache,
G. Di Pirro,
A. Drago, [......],
A. Ghigo,
S. Guiducci,
M. Incurvati,
C. Ligi,
F. Marcellini,
G. Mazzitelli,
C. Milardi,
L. Pellegrino, M.A. Preger,
P. Raimondi
[show abstract]
[hide abstract]
ABSTRACT: Obtaining very short bunches is an issue especially for colliders but also for CSR sources. The modulation of the bunch length in a strong rf focusing regime had been proposed, corresponding to a high value of the synchrotron tune. A ring structure where the function R56 along the ring oscillates between large positive and negative values will produce bunch length modulation. The synchrotron frequency can be tuned both by the rf power and by the integral of the function R56, up to the limit of zero value corresponding to the isochronicity condition. The proposal of a bunch length modulation along the ring in DA{Phi}NE is here described. DA{Phi}NE lattice can be tuned to positive or negative momentum compaction values, or to structures in which the two arcs are respectively set to positive/negative integrals of the R56 function. With the installation of an extra rf system at 1.3 GHz, experiments on bunch length modulation both in the regime of high and low synchrotron tune can be realized.
01/2006
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M. Zobov,
D. Alesini,
G. Benedetti,
M.E. Biagini,
C. Biscari,
R. Boni,
M. Boscolo,
A. Clozza,
G.D. Monache,
G. di Pirro, [......],
B. Spataro,
A. Stecchi,
A. Stella,
C. Vaccarezza,
M. Vescovi,
E. Levichev,
P. Piminov,
D. Shatilov,
J. Fox,
D. Teytelman
[show abstract]
[hide abstract]
ABSTRACT: The e+e- collider DAΦNE, a 1.02 GeV c.m. Φ-factory, has reached a peak luminosity of about 1.4×10<sup>32</sup>cm<sup>-2</sup>s<sup>-1</sup>and a peak integrated luminosity in one day of about 8.6 pb<sup>-1</sup>. With the current rates the physics program of the three main experiments DEAR, FINUDA and KLOE will be completed by the end of 2007. In this paper we describe in detail the steps which have led to the luminosity improvement and the options for the upgrade of the collider towards higher energy and/or luminosity.
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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C. Biscari,
D. Alesini,
G. Benedetti,
M.E. Biagini,
R. Boni,
M. Boscolo,
A. Clozza,
G. Delle Monache,
G. di Pirro,
A. Drago, [......],
M. Vescovi,
M. Zobov,
C. Pagani,
E. Levichev,
P. Piminov,
D. Shatilov,
J. Byrd,
F. Sannibale,
J. Fox,
D. Teytelman
[show abstract]
[hide abstract]
ABSTRACT: Obtaining very short bunches is an issue especially for colliders but also for CSR sources. The modulation of the bunch length in a strong rf focusing regime had been proposed, corresponding to a high value of the synchrotron tune. A ring structure where the function R56 along the ring oscillates between large positive and negative values will produce bunch length modulation. The synchrotron frequency can be tuned both by the rf power and by the integral of the function R 56 , up to the limit of zero value corresponding to the isochronicity condition. The proposal of a bunch length modulation along the ring in DAΦNE is here described. DAΦNE lattice can be tuned to positive or negative momentum compaction values, or to structures in which the two arcs are respectively set to positive/negative integrals of the R56 function. With the installation of an extra rf system at 1.3 GHz, experiments on bunch length modulation both in the regime of high and low synchrotron tune can be realized.
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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D. Alesini,
G. Benedetti,
M.E. Biagini,
C. Biscari,
R. Boni,
M. Boscolo,
A. Clozza,
G. Delle Monache,
G. Di Pirro,
A. Drago, [......],
M. Serio,
F. Sgamma,
B. Spataro,
P. Piminov,
A. Stecchi,
A. Stella,
F. Tazzioli,
C. Vaccarezza,
M. Vescovi,
M. Zobov
[show abstract]
[hide abstract]
ABSTRACT: The Frascati F-Factory DAFNE has been delivering luminosity to the KLOE, DEAR and FINUDA experiments since year 2000. Since April 2004 the KLOE run has been resumed and recently peak luminosity of 1.0x1032 cm-2s-1 and integrated luminosity of 6.2 pb-1/day have been achieved. The scientific program of the three high-energy experiments sharing DAFNE operation will be completed approximately by the end of year 2006. A scientific program for DAFNE beyond that date has not been defined yet and it is matter of discussion in the high-energy physics and accelerator physics communities. In this paper we present some future scenarios for DAFNE, discussing the expected ultimate performances of the machine as it is now and addressing the design for an energy and/or luminosity upgrade. The options presented in the following are not exhaustive and they are intended to give a glance of what is doable using the existing infrastructures.
12/2004;
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C. Milardi,
D. Alesini,
G. Benedetti,
M.E. Biagini,
C. Biscari,
R. Boni,
M. Boscolo,
A. Clozza,
D. Delle Monache,
G. Di Pirro, [......],
U. Rotundo,
C. Sanelli,
M. Serio,
F. Sgamma,
B. Spataro,
A. Stecchi,
A. Stella,
C. Vaccarezza,
M. Vescovi,
M. Zobov
[show abstract]
[hide abstract]
ABSTRACT: DAFNE operation restarted in September 2003, after a six month shut-down for the installation of FINUDA, a magnetic detector dedicated to the study of hypernuclear physics. FINUDA is the third experiment running on DAFNE and operates while keeping on place the other detector KLOE. During the shut-down both Interaction Regions have been equipped with remotely controlled quadrupoles in order to operate at different solenoid fields. Among many other hardware upgrades one of the most significant is the reshaping of the wiggler pole profile to improve the field quality and the machine dynamic aperture. Commissioning of the collider in the new configuration has been completed in short time. The peak luminosity delivered to FINUDA has reached 6 10^31 s-1cm-2, with a daily integrated value close to 4 pb-1.
09/2004;
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A Ghigo,
D Alesini,
C Biscari,
A Clozza,
A Drago,
A Gallo,
F Marcellini,
C Milardi,
B Preger, M A Preger,
C Sanelli,
M Serio,
F Sgamma,
A Stecchi,
A Stella,
M Zobov
[show abstract]
[hide abstract]
ABSTRACT: The first part of the CTF3 transfer line is already installed. It includes a chicane in which, because of its very flexible lattice and large aperture vacuum chamber, the bunch length can change in a wide range.The chicane can be used as a stretcher to lengthen the pulses coming from the linac in order to reduce the coherent synchrotron radiation (CSR) in the recombination rings. A possible use as a bunch compressor is also foreseen in order to make CSR experiments and to characterize beam instrumentation. This paper describes the final design of the vacuum chambers, including beam diagnostics components, and their laboratory tests. The installation status of the magnetic and vacuum chamber components together with the ancillary systems is reported.
9th European Particle Accelerator Conference (EPAC 2004), Lucerne, Switzerland; 07/2004
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D. Alesini,
G. Benedetti,
M.E. Biagini,
C. Biscari,
R. Boni,
M. Boscolo,
A. Clozza,
G. Delle Monache,
G. Di Pirro,
A. Drago A. Gallo, [......],
M. Serio,
F. Sgamma,
B. Spataro,
P. Piminov,
A. Stecchi,
A. Stella,
F. Tazzioli,
C. Vaccarezza,
M. Vescovi,
M. Zobov
DAFNE 2004: Workshop on Physics at Meson Factories, Frascati, Italy; 06/2004
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S. Guiducci,
D. Alesini,
G. Benedetti,
M.E. Biagini,
C. Biscari,
R. Boni,
M. Boscolo,
A. Clozza,
G. Delle Monache,
G. Di Pirro, [......],
L. Pellegrino, M.A. Preger,
P. Raimondi,
R Ricci,
C. Sanelli,
M. Serio,
F. Sgamma,
A. Stecchi,
C. Vaccarezza,
M. Zobov
[show abstract]
[hide abstract]
ABSTRACT: The results of 2002 DAFNE operation for the two experiments KLOE and DEAR are described. During 2003 a long shutdown has been dedicated to the installation of new Interaction Regions (IR) and to hardware modifications and upgrades. In the last section optics studies and performances expectations for the new machine configuration are reported.
04/2004;
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Conference Proceeding:
DAFNE
S Guiducci,
D Alesini,
G Benedetti,
M E Biagini,
C Biscari,
R Boni,
M Boscolo,
A Clozza,
G Delle Monache,
G Di Pirro, [......],
L Pellegrino, M A Preger,
P Raimondi,
R Ricci,
C Sanelli,
M Serio,
F Sgamma,
A Stecchi,
C Vaccarezza,
M Zobov
[show abstract]
[hide abstract]
ABSTRACT: The results of 2002 DAFNE operation for the two experiments KLOE and DEAR are described. During 2003 a long shutdown has been dedicated to the installation of new Interaction Regions (IR) and to hardware modifications and upgrades. In the last section optics studies and performances expectations for the new machine configuration are reported.
Workshop on e+ e- in the 1-GeV to 2-GeV Range: Physics and Accelerator Prospects - ICFA Mini-workshp - Working Group on HIgh Luminosity e+ e- Colliders, Alghero, Sardinia, Italy; 09/2003
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G. Benedetti,
D. Alesini,
M.E. Biagini,
C. Biscari,
R. Boni,
M. Boscolo,
A. Clozza,
G.D. Monache,
G. Di Pirro,
A. Drago, [......],
P. Raimondi,
R. Ricci,
C. Sanelli,
M. Serio,
F. Sgamma,
A. Stecchi,
A. Stella,
C. Vaccarezza,
M. Vescovi,
M. Zobov
[show abstract]
[hide abstract]
ABSTRACT: While the main advances in the standard model probing require the construction of very high-energy colliders, many open questions still remain which can be answered by exploring low and medium energy regions. In this framework we are investigating the possibility of upgrading the φ-factory DAφNE from the energy of 1.02 GeV c.m. up to the neutron-antineutron threshold (about 2 GeV c.m.) using the existing systems and structures. The luminosity required by the experiments for a light quark factory is of the order of few 10<sup>31</sup> cm<sup>-2</sup> s<sup>-1</sup>, easily achievable in the particle factory era. The very first results of the feasibility study are presented.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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[show abstract]
[hide abstract]
ABSTRACT: The DAΦNE Beam Test Facility (BTF) is a beam transfer line optimized to produce single electrons and positrons mainly for high-energy detectors calibration in the energy range between 20 and 800 MeV. The BTF has been successfully commissioned in February 2002, and started operation in November. The scheme of operation, the commissioning results, as well as the first users' experience are presented.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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D Alesini,
C Biscari,
R Boni,
A Clozza,
G Delle Monache,
G Di Pirro,
A Drago,
A Gallo,
A Ghigo,
F Marcellini,
C Milardi, M A Preger,
C Sanelli,
F Sannibale,
M Serio,
F Sgamma,
A Stecchi,
A Stella,
M Zobov
[show abstract]
[hide abstract]
ABSTRACT: In the CTF3 complex the Linac pulse train, 1.4 µs long, is squeezed to a 140 ns train with a peak current 10 times higher (35A) by means of the bunch interlacing technique. The compressor system consists of two rings; the first (Delay Loop) multiplies the Linac bunch frequency by a factor 2, the second (Combiner Ring) by another factor 5. The lattices of the rings and transfer lines allow fine tuning of the trajectory and bunch length. The beam impedance budget is minimized to avoid energy spread growth. The layout of the rings and the intermediate transfer lines are shown. Design of special components of the rings and measurements on the prototypes are presented.
8th European Particle Accelerator Conference (EPAC 2002), Paris, France; 06/2002
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S. Guiducci,
D. Alesini,
G. Benedetti,
S. Bertolucci,
C. Biscari,
R. Boni,
M. Boscolo,
A. Clozza,
G. Delle Monache,
S. Di Mitri, [......],
F. Sannibale,
M. Serio,
A. Stecchi,
A. Stella,
C. Vaccarezza,
M. Vescovi,
M. Zobov,
E. Perevedentsev,
P. Raimondi,
G. von Holtey
[show abstract]
[hide abstract]
ABSTRACT: DAΦNE, the Frascati LNF Φ-factory, is providing luminosity
for the KLOE experiment since July 2000. A steady increase of daily
integrated luminosity in KLOE has been obtained, due to interspersed
machine physics studies. The main results are: increase of single bunch
luminosity by reduction of the effects of nonlinear terms in the
machine, background reduction, refill of the colliding beams while
keeping the KLOE detector taking data and increase of stable stored
current. A fraction of machine time has been used to tune luminosity and
reduce background in the DEAR configuration. The luminosity delivered to
DEAR was sufficient to conclude the first phase of the experiment
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001; 02/2001
