CERN Accelerating science

ATS Notes

Darreres entrades:
2017-02-22
14:04
MD1831: Single Bunch Instabilities with Q" and Non-Linear Corrections / Carver, Lee Robert (CERN) ; Schenk, Michael (Ecole Polytechnique Federale de Lausanne (CH)) ; De Maria, Riccardo (CERN) ; Li, Kevin Shing Bruce (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Maclean, Ewen Hamish (CERN) ; Metral, Elias (CERN) ; Lasocha, Kacper (Jagiellonian University (PL)) et al.
During MD1751, it was observed that both a full single beam and 964 non-colliding bunches in Beam 1 (B1) and Beam 2 (B2) were both stable at the End of Squeeze (EOS) for 0A in the Landau ctupoles. [...]
CERN-ACC-NOTE-2017-0012.
- 2017. - 18 p.
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2017-02-22
13:53
MD2013: Tune shift along the batch at flat top / Carver, Lee Robert (CERN) ; Valuch, Daniel (CERN) ; Buffat, Xavier (CERN) ; Giovannozzi, Massimo (CERN) ; Iadarola, Giovanni (CERN) ; Metral, Elias (CERN) ; Salvant, Benoit (CERN)
A series of tests were performed that led to a measurement of the tune shift along a 96 bunch batch with 25ns spacing at at top. [...]
CERN-ACC-NOTE-2017-0011.
- 2017. - 12 p.

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2017-02-22
13:41
LHC MD 1988: Automatic coupling correction test / Fol, Elena (University of Applied Sciences (DE)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN)
This paper reports on the tests of new software development for automatic coupling correction and automatic model generation for data acquisition extending functionality of the Multiturn application..
CERN-ACC-NOTE-2017-0010.
- 2017. - 5 p.

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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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Enfocat a:
LHC MD Notes (60)