Beam Loss and Collimation at LHC

Jeanneret, J.B.; Aberle, O.; Ajguirei, I. L.; Aßmann, Ralph; Baishev, I.; Bojon, J P; Bruno, Luca; Carlier, E.; Chapochnikova, Elena; Chiaveri, E.; Dehning, B.; Fartoukh, S.; Ferrari, A.; Goddard, B.; Jiménez, Jose M.; Kaltchev, D.; Kain, V.; Kourotchkine, I.; Preis, H.; Ruggiero, F.; Schmidt, R.; Sievers, P.; Uythoven, Jan; Vlachoudis, V.; Vos, L; Vossenberg, E.B.

doi:10.1063/1.1638350

Cited by 3 publications

(2 citation statements)

References 2 publications

(6 reference statements)

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“…The observation time range is defined by the fastest possible use of a beam dump trigger signal by the beam dump itself and the response time of the helium temperature measurement system. Different families of BLM monitors are defined to ease the monitor design (see table 8.3) [41].…”

Section: Beam Loss Systemmentioning

confidence: 99%

LHC Machine

Evans¹,

Bryant²

2008

J. Inst.

1,786

1,344

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2008 JINST 3 S08001 9.3.1 The VME and PC Front End Computers 9.3.2 The PLCs 9.3.3 The supported fieldbuses 9.3.4 The WorldFIP fieldbus 9.3.5 The Profibus fieldbus 9.4 Servers and operator consoles 9.5 Machine timing and UTC 9.5.1 Central beam and cycle management 9.5.2 Timing generation, transmission and reception 9.5.3 UTC for LHC time stamping 9.5.4 UTC generation, transmission and reception 9.5.5 NTP time protocol 9.6 Data management 9.6.1 Offline and online data repositories 9.6.2 Electrical circuits 9.6.3 Control system configuration 9.7 Communication and software frameworks 9.7.1 FEC software framework 9.7.2 Controls Middleware 9.7.3 Device access model 9.7.4 Messaging model 9.7.5 The J2EE framework for machine control 9.7.6 The UNICOS framework for industrial controls 9.7.7 The UNICOS object model 9.8 Control room software 9.8.1 Software for LHC beam operation 9.8.2 Software requirements 9.8.3 The software development process 9.8.4 Software for LHC Industrial Systems 9.9 Services for operations 9.9.1 Analogue signals transmission 9.9.2 Alarms 9.9.3 Logging 9.9.4 Post mortem 10 Beam dumping 10.1 System and main parameters 13 LHC as an ion collider 13.1 LHC parameters for lead ions 13.1.1 Nominal ion scheme 13.1.2 Early ion scheme 13.2 Orbits and optical configurations for heavy ions 13.3 Longitudinal dynamics 13.4 Effects of nuclear interactions on the LHC and its beams 13.5 Intra-beam scattering 13.6 Synchrotron radiation from lead ions LHC machine acronyms Bibliography-vi-2008 JINST 3 S08001 Chapter 1 2008 JINST 3 S08001 2.2.7 Collective beam instabilities The interaction of the charged particles in each beam with each other via electromagnetic fields and the conducting boundaries of the vacuum system can result in collective beam instabilities. Generally speaking, the collective effects are a function of the vacuum system geometry and its surface properties. They are usually proportional to the beam currents and can therefore limit the maximum attainable beam intensities. 2.2.8 Luminosity lifetime The luminosity in the LHC is not constant over a physics run, but decays due to the degradation of intensities and emittances of the circulating beams. The main cause of the luminosity decay during nominal LHC operation is the beam loss from collisions. The initial decay time of the bunch intensity, due to this effect, is:

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Section: Beam Loss Systemmentioning

confidence: 99%

LHC Machine

Evans¹,

Bryant²

2008

J. Inst.

1,786

1,344

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show abstract

“…Estimates for the linear sum of fabrication tolerance, survey precision and alignment uncertainties amount to 5.1 mm, resulting in a minimum clearance of 12.1 mm radius with respect to the nominal beamline. The LHC aperture is quoted in terms of the so-called n 1 parameter [31], which is a function of this mechanical clearance as well as the position along the beam line due to the varying beta function. The 12.1 mm clearance corresponds to an aperture of n 1 = 13.9 at the ALICE interaction point for nominal injection optics.…”

Section: Beam Pipe Radius and Wall Thicknessmentioning

confidence: 99%