Future Colliders

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First a tragedy, then farce

Physics World 21:9 (2008) 14-15
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First data from the linear collider alignment and survey project (LiCAS)

EPAC 2008 - Contributions to the Proceedings (2008) 1344-1346

Authors:

A Reichold, P Brockill, S Cohen, J Dale, M Dawson, T Handford, M Jones, G Moss, LA Rainbow, M Tacon, CU Estrada, D Urner, R Wastie, S Yang, J Prenting, M Schlösser, G Grzelak

Abstract:

The LiCAS project has developed a prototype robotic survey system for rapid and highly accurate surveying of long linear accelerator tunnel networks. It is aimed at the International Linear Collider (ILC). This Rapid Tunnel Reference Surveyor (RTRS) is an R&D instrument for evaluating the performance of the RTRS concept and its survey technology. The prototype has been commissioned in a test tunnel at DESY with initial calibrations and measurements ongoing. We will report recent results where they improve over previously reported work.

Measurement of isolated photon production in deep-inelastic scattering at HERA

European Physical Journal C 54:3 (2008) 371-387

Authors:

FD Aaron, A Aktas, C Alexa, V Andreev, B Antunovic, S Aplin, A Asmone, A Astvatsatourov, S Backovic, A Baghdasaryan, P Baranov, E Barrelet, W Bartel, S Baudrand, M Beckingham, K Begzsuren, O Behnke, O Behrendt, A Belousov, N Berger, JC Bizot, MO Boenig, V Boudry, I Bozovic-Jelisavcic, J Bracinik, G Brandt, M Brinkmann, V Brisson, D Bruncko, FW Büsser, A Bunyatyan, G Buschhorn, L Bystritskaya, AJ Campbell, KB Cantun Avila, F Cassol-Brunner, K Cerny, V Cerny, V Chekelian, A Cholewa, JG Contreras, JA Coughlan, G Cozzika, J Cvach, JB Dainton, K Daum, M Deak, Y De Boer, B Delcourt, M Del Degan, J Delvax, A De Roeck, EA De Wolf, C Diaconu, V Dodonov, A Dubak, G Eckerlin, V Efremenko, S Egli, R Eichler, F Eisele, A Eliseev, E Elsen, S Essenov, A Falkiewicz, PJW Faulkner, L Favart, A Fedotov, R Felst, J Feltesse, J Ferencei, L Finke, M Fleischer, A Fomenko, G Franke, T Frisson, E Gabathuler, J Gayler, S Ghazaryan, S Ginzburgskaya, A Glazov, I Glushkov, L Goerlich, M Goettlich, N Gogitidze, S Gorbounov, M Gouzevitch, C Grab, T Greenshaw, BR Grell, G Grindhammer, S Habib, D Haidt, M Hansson, G Heinzelmann, C Helebrant, RCW Henderson, H Henschel, G Herrera, M Hildebrandt

Abstract:

The production of isolated photons in deep-inelastic scattering ep→eγX is measured with the H1 detector at HERA. The measurement is performed in the kinematic range of negative four-momentum transfer squared 450 GeV. The analysis is based on a total integrated luminosity of 227 pb-1. The production cross section of isolated photons with a transverse energy in the range 3
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Micron size laser-wire system at the ATF extraction line

EPAC 2008 - Contributions to the Proceedings (2008) 1065-1067

Authors:

A Aryshev, GA Blair, ST Boogert, G Boorman, A Bosco, L Deacon, P Karataev, D Howell, LJ Nevay, L Corner, N Delerue, B Foster, F Gannaway, M Newman, R Senanayake, R Walczak, H Hayano, N Terunuma, J Urakawa

Abstract:

The KEK Accelerator test facility (ATF) extraction line laser-wire system has recently been upgraded allowing the measurement of micron scale transverse size electron beams. We report on the hardware upgrades, including focusing lens, laser diagnostics and mechanical systems. The first measurements using the new system from recent operation at the ATF are presented.

Nanometre precision interferometric stability monitoring systems for key accelerator components

EPAC 2008 - Contributions to the Proceedings (2008) 1350-1352

Authors:

MS Warden, PA Coe, D Urner, A Reichold

Abstract:

The MONALISA group develops novel, accurate, nanometre resolution, interferometric systems to monitor relative motions between key accelerator components. We use cost-effective technology developed for the telecommunications market, providing readily scalable, adaptable solutions. Key magnets and diagnostics in the beam-delivery section of the International Linear Collider (ILC) will need to maintain stable relative positions. In particular, the final focus quadrupole magnets require nanometre level stability. Even greater stability requirements will be placed on components for the Compact Linear Accelerator (CLIC). Interferometers provide the only means of monitoring relative positions over long timescales, at the nanometre and sub-nanometre level. The latest results from our novel design, fibre-coupled interferometers will be presented.