160 MeV H&lt;sup&gt;-&lt;/sup&gt; injection into the CERN PSB

Weterings, W.; Bellodi, G.; Borburgh, J.; Fowler, T.; Gerigk, F.; Goddard, B.; Hanke, K.; Martini, M.; Sermeus, L.

doi:10.1109/pac.2007.4440845

Cited by 6 publications

(3 citation statements)

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“…Table 1 and Figure 1 provide an overview on the machine's essential parameters. The determination of the transverse emittance at the end of the linac is essential in order to avoid high losses when the beam is injected into the PS-Booster [10]. Therefore the 160 MeV region is the envisaged final location for the proposed laserwire instrument.…”

Section: Linac4mentioning

confidence: 99%

Experimental results of the laserwire emittance scanner for LINAC4 at CERN

Hofmann

Boorman

Bosco

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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Diamond Fibre optics a b s t r a c tWithin the framework of the LHC Injector Upgrade (LIU), the new LINAC4 is currently being commissioned to replace the existing LINAC2 proton source at CERN. After the expected completion at the end of 2016, the LINAC4 will accelerate H À ions to 160 MeV. To measure the transverse emittance of the H À beam, a method based on photo-detachment is proposed. This system will operate using a pulsed laser with light delivered via an optical fibre and subsequently focused onto the H À beam.

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Section: Linac4mentioning

confidence: 99%

Experimental results of the laserwire emittance scanner for LINAC4 at CERN

Hofmann

Boorman

Bosco

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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“…Within the scope of the LIU project, the linear accelerator Linac2 is replaced by a new machine, Linac4 [6,7], a normal conducting 160 MeV H − linear accelerator. The future kinetic injection energy to the PSB will hence be increased from 50 MeV to 160 MeV [8] to reduce space charge effects [9]. The extraction beam kinetic energy will also be increased from 1.4 GeV to 2 GeV, with the exception of the ISOLDE facility that will not be upgraded but may require higher intensity per pulse in the framework of Physics Beyond Colliders (PBC) [10].…”

Section: Introductionmentioning

confidence: 99%

Source of horizontal instability at the CERN Proton Synchrotron Booster

Koukovini-Platia

Barnes

Bartosik

et al. 2019

Phys. Rev. Accel. Beams

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The CERN Proton Synchrotron Booster (PSB) has been known to suffer from horizontal instabilities since its early operation in the 1970s. These instabilities appear at specific beam energies and range of working points. The source of the instability and the reason why the instabilities appear at specific energies remained unidentified. However, in routine operation, the instabilities have not been limiting the PSB performance reach thanks to the use of a horizontal feedback system, which can suppress their onset for all beam intensities needed in the PSB. Recently, the interest in these instabilities has been revived by the ongoing LHC Injectors Upgrade (LIU) program, as well as, the Physics Beyond Colliders (PBC) study group. In fact, the PSB is being upgraded to a new energy range and higher beam intensities will be requested in future operation. To ensure that these instabilities will not limit the PSB performance in the future parameter range, a systematic characterization has been carried out through several measurements and models. At fixed energy, the dependence of the instability on the working point has been fully studied experimentally. Macroparticle simulations and analytical modeling have been applied to explain the measurements, suggesting that the main driving term behind these instabilities is the unmatched termination of the PSB extraction kickers. Analytical studies also explained for the first time why the instability appears at specific energies in the PSB cycle and showed that no other instability is expected above 1.4 GeV. Finally, the hypothesis on the main instability driving term has been verified experimentally by performing measurements with the kicker terminations temporarily matched. In this configuration, no sign of instability was observed and the extraction kicker could be unambiguously identified as the source of the instability. Some options to permanently suppress the source of the instability are proposed.

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“…L4 is an H − linear accelerator [3] intended to deliver a beam at 160 MeV energy to the 4 superposed synchrotron rings of the PSB. The beam will be injected horizontally into the PSB by means of a H − charge exchange injection system, one for each ring, through a graphite foil aiming to convert ~98 % of the beam to protons [4]. Partially stripped H 0 and ~1% H − missing the foil will be directed to an internal H 0 /H − dump [5].…”

Section: Introductionmentioning

confidence: 99%

First experience with carbon stripping foils for the 160 MeV H− injection into the CERN PSB

Weterings

Bracco

Jorat

et al. 2018

AIP Conference Proceedings

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160 MeV H − beam will be delivered from the new CERN linear accelerator (Linac4) to the Proton Synchrotron Booster (PSB), using a H − charge-exchange injection system. A 200 µg/cm 2 carbon stripping foil will convert H − into protons by stripping off the electrons. The H − charge-exchange injection principle will be used for the first time in the CERN accelerator complex and involves many challenges. In order to gain experience with the foil changing mechanism and the very fragile foils, in 2016, prior to the installation in the PSB, a stripping foil test stand has been installed in the Linac4 transfer line. In addition, parts of the future PSB injection equipment are also temporarily installed in the Linac4 transfer line for tests with a 160 MeV H − commissioning proton beam. This paper describes the foil changing mechanism and control system, summarizes the practical experience of gluing and handling these foils and reports on the first results with beam.

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160 MeV H<sup>-</sup> injection into the CERN PSB

Cited by 6 publications

References 1 publication

Experimental results of the laserwire emittance scanner for LINAC4 at CERN

Experimental results of the laserwire emittance scanner for LINAC4 at CERN

Source of horizontal instability at the CERN Proton Synchrotron Booster

First experience with carbon stripping foils for the 160 MeV H− injection into the CERN PSB

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