CERN Accelerating science

ATS Notes

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2017-02-15
09:50
Coupled-bunch instabilities due to fundamental cavity impedance / Mastoridis, Themistoklis (California Polytechnic State Univ. (US)) ; Baudrenghien, Philippe (CERN) ; Chapochnikova, Elena (CERN) ; Esteban Muller, Juan (CERN) ; Molendijk, John (CERN) ; Timko, Helga (CERN)
The purpose of this MD was to estimate the stability threshold due to longitudinal coupled-bunch instabilities (CBIs) driven by the RF cavities' fundamental impedance. [...]
CERN-ACC-NOTE-2017-0009.
- 2017.
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2017-02-10
18:45
Code Development for Collective Effects / Bruce Li, Kevin Shing (CERN) ; Bartosik, Hannes (CERN) ; Hegglin, Stefan Eduard (Eidgenoessische Tech. Hochschule Zuerich (CH)) ; Iadarola, Giovanni (CERN) ; Oeftiger, Adrian (CERN) ; Passarelli, Andrea (Technische Universitaet Darmstadt (DE)) ; Romano, Annalisa (Technische Universitaet Darmstadt (DE)) ; Rumolo, Giovanni (CERN) ; Schenk, Michael (Ecole Polytechnique Federale de Lausanne (CH))
The presentation will cover approaches and strategies of modeling and implementing collective effects in modern simulation codes. [...]
CERN-ACC-NOTE-2017-0008.
- 2016. - 7 p.
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2017-01-23
15:09
Space Charge Mitigation With Longitudinally Hollow Bunches / Oeftiger, Adrian (CERN) ; Hancock, Steven (CERN) ; Rumolo, Giovanni (CERN)
Suitably, hollow longitudinal phase space distributions have a flat profile and hence reduce the impact of transverse space charge. [...]
CERN-ACC-NOTE-2017-0007.
- 2016. - 6 p.
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2017-01-23
11:40
RF Measurements and Tuning of the 750 MHz HF-RFQ / Koubek, Benjamin (CERN) ; Grudiev, Alexej (CERN) ; Timmins, Marc (CERN)
In the frame of the program on medical applications CERN has built a compact 750 MHz RFQ to be used as an injector for a hadron therapy linac. [...]
CERN-ACC-NOTE-2017-0006.
- 2017.
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2017-01-17
11:18
Summary of the half-day internal review of LHC performance limitations (linked to transverse collective effects) during run II (CERN, 29/11/2016) / Metral, Elias (CERN) ; Arduini, Gianluigi (CERN) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee Robert (CERN) ; Iadarola, Giovanni (CERN) ; Li, Kevin Shing Bruce (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Romano, Annalisa (Technische Universitaet Darmstadt (DE)) ; Schenk, Michael (Ecole Polytechnique Federale de Lausanne (CH)) et al.
In this note the half-day internal review of LHC performance limitations (linked to transverse collective effects) during run II (2015-2016), which took place at CERN on 29/11/2016 (https://indico.cern.ch/event/589625/), is summarised and the next steps are discussed..
CERN-ACC-NOTE-2017-0005.
- 2017. - 12 p.

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2017-01-17
09:11
Preliminary Design Study of the Hollow Electron Lens for LHC / Perini, Diego (CERN) ; Zanoni, Carlo (CERN)
A Hollow Electron Lens (HEL) has been proposed in order to improve performance of halo control and collimation in the Large Hadron Collider in view of its High Luminosity upgrade (HL-LHC). [...]
CERN-ACC-NOTE-2017-0004.
- 2017. - 24 p.
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2017-01-16
16:04
MD 1266: Injection of "high performance reach" 80b 25 ns beam / Bartmann, Wolfgang (CERN) ; Fraser, Matthew Alexander (CERN) ; Iadarola, Giovanni (CERN) ; Kain, Verena (CERN) ; Velotti, Francesco Maria (CERN) ; Muller, Jeremy Alfred
This note summarises the measurements and observations performed during the LHC Machine Development concerning the injection of batches of 80 bunches for future “high performance reach” of the LHC [...]
CERN-ACC-NOTE-2017-0003.
- 2017. - 9 p.
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2017-01-16
15:58
MD 1242: Injection and emittance preservation / Bartosik, Hannes (CERN) ; Bravin, Enrico (CERN) ; Iadarola, Giovanni (CERN) ; Kain, Verena (CERN) ; Trad, Georges (CERN) ; Velotti, Francesco Maria (CERN)
This note summarises the measurements and observations performed during the LHC Machine Development concerning the injection and emittance preservation studies with BCMS beam [...]
CERN-ACC-NOTE-2017-0002.
- 2017. - 9 p.
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2017-01-09
10:11
Thermal Analysis of the Linac3 GTS-LHC ECR Ion Source / Fichera, Claudio (CERN) ; Carra, Federico (CERN) ; Toivanen, Ville Aleksi ; Kuchler, Detlef (CERN)
The Linac3 ion source produces lead beams by the vaporization of solid samples inside internal ovens. [...]
CERN-ACC-NOTE-2017-0001.
- 2017. - 16 p.
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2016-12-16
17:42
Measurement report on the LHC injection kicker ripple denition and maximum pulse length (MD 1268) / Bartmann, Wolfgang (CERN) ; Barnes, Mike (CERN) ; Kotzian, Gerd (CERN) ; Stoel, Linda (Vienna University of Technology (AT)) ; Velotti, Francesco Maria (CERN) ; Vlachodimitropoulos, Vasileios (CERN) ; Wiesner, Christoph (CERN)
The present LHC lling scheme uses a batch spacing which corresponds to the design report specication of the injection kicker rise time. [...]
CERN-ACC-NOTE-2016-0077.
- 2016. - 3 p.
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LHC MD Notes (57)