Motivation: ERL based e linac for LHeC
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1 Erk Jensen, for the LHeC team and the RF group ERL 2013, BINP, Novosibirsk, 09 Sep Sep
2 Motivation: ERL based e linac for LHeC ( O. Brünings presentation) NB.: This is a 09 Sep
3 Some references This is a relatively recent proposal at an early stage, which is still being discussed with CERN management and international partners. Here some references documenting the birth of the idea: Chamonix, 9 Feb 2012: SC Cavities R&D for LHeC and HE LHC 15 June 2012, LHeC Workshop Chavannes: ERL & Frequency Choice, 5 Sept 2012, meeting with Daresbury group: 22 Jan 2013, Meeting at Daresbury meeting 12 March 2013: Choice of RF Frequency : 09 Sep
4 Goals of a CERN ERL Test Facility 09 Sep
5 Similar, but different: Some low energy ERL s/test Facilities IHEP ERL TF, Beijing BERLinPro 2 x 9 cell, 1.3 GHz + DC Gun 10 ma, 35 MeV, 2 ps 3 x 9 cell cavities, 1.3 GHz 100 ma, 100 MeV, 2 ps PKU ERL FEL ALICE, Daresbury 1 x 9 cell, 1.3 GHz 60 pc, 30 MeV, 2 ms bunch train 2 x 9 cell, 1.3 GHz 100 pc, 10 MeV, 100 µs bunch train 2 loop cerl, KEK Brookhaven ERL 1 x 5 cell, 704 MHz nc, 20 MeV, CW 9 cell, 1.3 GHz cavities, 4 modules 77 pc, 245 MeV, 1 3 ps 09 Sep
6 and of course BINP, here in Novosibirsk: Normal Conducting, 180 MHz + DC Gun 30 ma, 11 MeV, ps 09 Sep
7 Preliminary parameters of CERN ERL TF 09 Sep
8 A possible layout SCL2 Dump 300 MeV ERL Layout 4 x 5 cell, 802 MHz SCL1 5 MeV Injector ~ 7 m 09 Sep
9 ERL TF 300 MeV Initial Layout Alex Bogacz (JLAB) 2 passes up: 09 Sep
10 ERL TF 300 MeV Initial Layout Alex Bogacz (JLAB) 2 passes down: 09 Sep
11 Variations built in in flexibility Alessandra Valloni (CERN) 5 MeV Injector Dump 5 MeV Injector Dump Dump 5 MeV Injector 09 Sep
12 Looking at experimental CERN RF Power Cryogenics 09 Sep
13 MHz 8 cavity 8 cavity CM? Alessandra Valloni (CERN) 09 Sep
14 Relevant ongoing work at CERN: SPL (704 MHz) CM Vittorio Parma (CERN) scaling: 704 MHz 800 MHz 09 Sep
15 Remark: designed for slope 1.7 % Vittorio Parma (CERN) 09 Sep
16 Vittorio Parma (CERN) 09 Sep
17 SPL CM Design Bi phase He tube Ofelia Capatina (CERN) Bellows Helium Tank CEA tuner Bulk Nb 5 cell cavity Magnetic shielding HOM Coupler Double wall tube Inter cavity support RF Power Coupler 09 Sep
18 SPL CM Design Arnaud Vande Craen (CERN) 09 Sep
19 SPL CM Design Arnaud Vande Craen (CERN) 09 Sep
20 SPL CM Assembly sequence Rossana Bonomi(CERN) 1 String of dressed cavities from clean room 2 Mounting of magnetic shields 3 Mounting of tuners and inter cavity supports 4 Mounting of cryogenic distribution 5 Mounting of coupler cooling line Design by CNRS IPNO (courtesy of S.Rousselot) Not latest design! 6 Mounting of thermal shield 7 Insertion in vacuum vessel 8 Closing vacuum vessel 09 Sep
21 Cryo load estimate (very preliminary) 09 Sep
22 SPL Cavities 1 st industrially produced cavity received Aug/12 from RI. Treated, rinsed & tested at CERN, 1 st results encouraging (very preliminary). First of five 5 cell cavities in production, SM18 upgrade advancing well Clean room assembly planned I/ st SPL single cell from RI 1 st cold measurement results 09 Sep
23 SM18 Cleanroom upgrade Janic Chambrillon (CERN) Pre assembly area (class 100) Final assembly area (class 10) Class 100 soft wall Class 10,000 HIE ISOLDE Cryomodule assembly Optical Inspection HPR Cabinet (BNL SPEC) 09 Sep
24 SPL time line (version 4/13) Karl Schirm (CERN) now 09 Sep
25 SPS 801 MHz system renovation CERN is upgrading the old SPS 801 MHz system ( Landau cavities) Eric Montesinos (CERN) New CERN 801 MHz, 60 kw CW IOT transmitter 5 units received & tested, 4 to come Thales trolley with IOT, 60 kw 801 MHz, BW 1dB > 6 MHz Standard WR1150 waveguide components 09 Sep
26 Other cryomodules at CERN LHC: 400 MHz; Nb sputtered on Cu 4 single cell elliptical cavities in 1 CM 4 CM s in tunnel. (no instrumentation) 09 Sep
27 Other cryomodules at CERN Cryostats for RF tests (no instrumentation) 09 Sep
28 Other cryomodules at CERN (no instrumentation) 09 Sep
29 Other cryomodules at CERN (no instrumentation) 09 Sep
30 Conclusions ERLs a fascinating concept, modern and energy efficient! CERN cannot ignore! As a 1 st step to embark on ERL s, we propose an ambitious yet feasible ERL CERN. This facility is complementary to & synergetic with other proposals. As 1 st step to the 1 st step, we will jointly with motivated, expert international partners develop the necessary concepts and start prototyping. 09 Sep
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