HALHF: a hybrid, asymmetric, linear Higgs factory using plasma- and RF-based acceleration

Adli, Erik; Walker, Nicholas J.; Appleby, Joshua; Faus-Golfe, Angeles; Hørlyk, Eir Eline; Samoilenko, Dmitrii; Wood, Jonathan; Caldwell, Allen; Nanni, Emilio; Lu, Xueying; Farrington, Sinead; Wing, Matthew; Boogert, Stewart; Sloan, Terry; Laudrain, Antoine; Sedlackova, Nela; List, Jenny; Pick, Gudrid Moortgat; Seryi, Andrei; Harrison, Alexander; Forrester, Louis; Cilento, Vera; D'Arcy, Richard; Põder, Kristjan; Foster, Brian; Bettoni, Simone; Lindstrøm, Carl A.; Barklow, Timothy L.; Kalvik, Daniel; Hamann, Niclas; Peña, Felipe; Wenskat, Marc; List, Benno; Stapnes, Steinar; Formela, Manuel; Trautwein, Malte; Mactavish, Edward; Hogan, Mark J.; Osterhoff, Jens; Farmer, John; Bin Ben Chen, Jian; Formenti, Arianne; Gao, Jie; Tomas Garcia, Rogelio; Titov, Maxim; Leemans, Wim; Drobniak, Pierre; Sjobak, Kyrre; Dyson, Calvin; Osborne, John; Doebert, Steffen; Biagini, Marica; Svensson, Jonas Björklund; Reuter, Jürgen; HALHF Collaboration; Dou, Wang; Corner, Laura; Lehe, Reme; Thévenet, Maxence; Berggren, Mikael; Maslov, Vasyl; Burrows, Philip; Gessner, Spencer

Preprint

PUBDB-2025-05373

HALHF: a hybrid, asymmetric, linear Higgs factory using plasma- and RF-based acceleration

Adli, E. ; Appleby, J. ; Barklow, T. L. ; Biagini, M. ; Svensson, J. B. ; Berggren, M.DESY* ; Bettoni, S. ; Boogert, S.Extern* ; Burrows, P. ; Caldwell, A.Extern* ; Bin Ben Chen, J. ; Cilento, V. ; Corner, L. ; D'Arcy, R.Extern* ; Doebert, S. ; Dou, W. ; Drobniak, P. ; Dyson, C. ; Farrington, S. ; Farmer, J. ; Faus-Golfe, A. ; Formela, M.DESY* ; Formenti, A. ; Forrester, L. ; Foster, B. ; Gao, J. ; Gessner, S. ; Hamann, N.Extern*DESY* ; Harrison, A. ; Hogan, M. J. ; Hørlyk, E. E. ; Kalvik, D. ; Laudrain, A.DESY* ; Lehe, R. ; Leemans, W.DESY* ; Lindstrøm, C. A. ; List, B.DESY* ; List, J.DESY* ; Lu, X. ; Mactavish, E. ; Maslov, V.DESY* ; Nanni, E. ; Osborne, J. ; Osterhoff, J. ; Peña, F. ; Pick, G. M. ; Põder, K.DESY* ; Reuter, J. ; Samoilenko, D.CFEL*Extern*DESY* ; Sedlackova, N. ; Seryi, A. ; Sjobak, K. ; Sloan, T. ; Stapnes, S. ; Tomas Garcia, R. ; Titov, M. ; Trautwein, M.Extern* ; Thévenet, M.DESY* ; Walker, N. J.DESY* ; Wenskat, M.DESY* ; Wing, M.Extern* ; Wood, J.DESY* ; HALHF Collaboration (Collaboration author)

2025

(2025) [10.3204/PUBDB-2025-05373]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-05373

Report No.: arXiv:2503.19880

Abstract: HALHF is a hybrid linear collider that uses electron-driven plasma-wakefield acceleration to accelerate electrons to high energy while using radio-frequency cavity technology to accelerate positrons. The most cost-effective solution collides low-energy positrons with high-energy electrons, producing a boost to the final state in the electron direction with $\gamma= 1.67$. The current HALHF baseline design produces a luminosity comparable to that of the baseline ILC but with a greatly reduced construction and carbon footprint and hence much lower cost than the mature linear-collider designs ILC and CLIC. Costs for HALHF are evaluated, together with that for the approximate 15-year R&D programme necessary to realise HALHF. Time scales and cost for the R&D are estimated. Upgrade paths for HALHF technology from a 250~GeV Higgs factory, through 380 and 550~GeV, up to 10~TeV are sketched.

Note: Submitted to the European Strategy for Particle Physics, 2026 Update

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