Superconducting RF Crab Cavities Marco Garlasch CERN ENMME

Superconducting RF Crab Cavities Marco Garlaschè – CERN EN/MME On behalf of the Crab Cavities Team Hi. Lumi LHC Goes To Industry Workshop CERN, Geneva, Switzerland – 26 June, 2015

Crab Cavities: Why? Currently in LHC, at a given experiment… Collision Point 2φ to increase the number of collisions between the two LHC beams by reducing the crossing angle φ Hi. Lumi 2 Industries - Garlaschè 26/06/2015 …the AIM… 2

Crab Cavities: Why? …the ANSWER… 26/06/2015 Superconducting Radio-Frequency Cavities, a. k. a. CRAB Cavities Hi. Lumi 2 Industries - Garlaschè 3

Crab Cavities: Where & When? SM 18 Area (~2016) Initial testing: CRAB cavities, clean room & handling facilities. . SPS Test (before LS 2) 2 x Prototype Modules LHC Point 1 Modules to be installed on each IP side & beam Hi. Lumi 2 Industries - Garlaschè 26/06/2015 LHC Point 5 Modules to be installed on each IP side & beam 4

Crab Cavities: What? …a Module is… Cryostat embedding o 2 x CRAB cavities o auxiliary systems 80 K > T > 2 K 2 K BEAM 300 K > T > 80 K 26/06/2015 2 K Hi. Lumi 2 Industries - Garlaschè 5

Bottom-Up View: Cavities RFD Cavity mm 650 2 x designs! Highly non-axialsymmetrical Niobium cavities Technologies Involved: o Forming of 3÷ 4 mm-thick Niobium sheets non axisymm. shapes, high aspect ratios, profile tolerance ~ 0. 5 mm o EB-welding (strict requirements …): Nb/Nb & Nb/Nb. Ti o Brazing (or other) of Nb to S. Steel mm Interest for Suppliers Not Needed Much Welcome Needed Hi. Lumi 2 Industries - Garlaschè 26/06/2015 900 DQW Cavity 6

Manufacturing R&D with companies CRABS Initial tests qualification of forming and RF SPL Project forming & welding of Cu Nb CERN Hi. Lumi 2 Industries - Garlaschè 26/06/2015 Nb/SS CERN 7

Al 2 O 3 HOMs & FPCs 1 200 mm ine ial l Cu x Coa SS Nb 620 mm Input/Output systems for power management inside cavities o Mix turning + milling + assembly of Cu and Nb parts (assembly profile ~0. 3 mm) o Brazing of vacuum-air interfaces embedding Ceramic + Cu + S. Steel 1 High Order Mode Dampers, Fundamental Power Couplers Hi. Lumi 2 Industries - Garlaschè 26/06/2015 Technologies Involved: 8

Magnetic Shieldings & He Vessel TSHIELD= 80 K÷ 300 K TSHIELD= 2 K Ti, b N al ( i r e t m) a u i n M a t w i a T l, fr e o e y t l S p. p t Su g, S n i d l e i Sh Magn. Helium Vessel: o Machining (Titanium Gr. 2) o Assembly + Titanium TIG welding o Supply of Titanium bellows 900 26/06/2015 Magnetic Shielding alloy: o Forming + assembly o Annealing treatment mm Hi. Lumi 2 Industries - Garlaschè 9

Cryostat 1700 mm 2900 mm • Sheet metal working of tank (precision interfaces) • Cryo Line (welds tight at 2 K) • Ti/S. Steel direct transitions (also @ 2 K) • SS Bellows and vacuum equip. • Thermal shielding with Helium cooling + MLI … 26/06/2015 Manufacturing of Cryostat and Auxiliary systems Hi. Lumi 2 Industries - Garlaschè 10

Electronics and Power supplies Courtesy E. Montesinos Series 26/06/2015 SPS Test Hi. Lumi 2 Industries - Garlaschè 11

Not Forgetting… Passive/active Tuning System (ref. Kurt Artoos) FSI 1 Alignment System Actuation 1 Frequency Scanning Interferometry Hi. Lumi 2 Industries - Garlaschè 26/06/2015 (ref. Mateusz Sosin) 12