Central Region Working Group K. Yokoya 2015-1215 CRWG meeting ADI, 2015-1210, Yokoya
Charge (1) To develop a conceptual design for the central region of the ILC at a level of detail consistent with a change request and sufficient to define the CFS features of this area of the machine. The central region = downstream of the two main linacs: e- source, Undulator driven e+ source, DR transfer lines (but not DR), RTML, BDS including associated hardware (dumps, collimators, spoilers etc..) IR ADI, 2015-1210, Yokoya
Charge (2) Should assume Positron source Detector Hall layout as specified in CR-003. Tunnel geometry as specified in CR-004 (2x1.5km extension) and lattice ILC2015b. ML tunnel cross-section as outlined for a 1.5 m central shielding wall (CR12 --- note the number changed 1312). Positron source Should be based on the undulator driven, positron source as modified by CR-011. To be understood as the relocation of the 5GeV booster upstream Should not incorporate any active features of a conventional positron source (e.g. klystron galleries, additional shielding, etc..) at this time. Should however satisfy yourselves that the CFS layout you propose is consistent with the possibility of the subsequent adoption of such a source should that prove advantageous at some point in the future. ADI, 2015-1210, Yokoya
Charge (3) Some of the information you will likely need is not completely specified at this time. Hopefully it will be available soon. The Working Group will thus need to exercise a degree of judgment in how it approaches this task. Avoid the temptation of trying to produce an engineering level of detail. We are not scoped for such a task at this time It is important to develop the central region concept in a timely way since changes have been made since the TDR and we need to progress towards a Kitakami site specific CFS footprint. The Working Group should attempt to derive a cost- neutral (or cost reducing) approach though I appreciate that the TDR baseline was estimated in a somewhat generic fashion for this part of the machine thus cost comparisons might prove difficult. ADI, 2015-1210, Yokoya
Charge (4) You should plan towards having a working concept for the ECFA workshop in Santander, in June 2016 (May 30 – Jun 5). ADI, 2015-1210, Yokoya
Members BDS: Glen White, Toshiyuki Okugi, Sources: Masao Kuriki, CFS: Masanobu Miyahara, Tomoyuki Sanuki, General: Benno List, Ewan Paterson, Kaoru Yokoya Meetings Normally Tuesday, standard time (6pm California, 3pm EU, 11pm Japan) Right after CFS (1hr earlier) …… what to do in DST? Same time as TB First meeting on Dec.15 Every other week Archives? ADI, 2015-1210, Yokoya
What must be considered? (1) Positron line Relocation of booster linac decided already Positron spin rotator 2 parallel line for up and down polarization (strong request from physics and positron groups) Superconducting or normal-conducting solenoid? Lattice in the undulator region --> positron group Lattice in the booster positron group Auxiliary positron source ADI, 2015-1210, Yokoya
What must be considered? (2) Positron line Global timing chicane (where?) Insert a chicane with orbit length > 46cm (+-23cm) in the transfer line of produced positron to the DR 3 possibilities At 400MeV At 5GeV in BDS tunnel lattice 2015b will include this At 5GeV after the bend to DR Controllability Range of online control Fine feedback for IP?? 400MeV 5GeV DR ADI, 2015-1210, Yokoya
Okugi. LCWS2015 ADI, 2015-1210, Yokoya
What must be considered? (3) BDS line Muon wall Related to the transverse size of BDS tunnel Relation to the background To be studied by BDS group Beam diagnostics section Okugi Collimator area Required shielding Amount of radiation BDS Beam dump (emergency dump, tune-up dumps, main dumps) Abort kicker BDS Flat-top length Dump hall design Who? By when? Emergency signal ADI, 2015-1210, Yokoya
Okugi. LCWS2015 ADI, 2015-1210, Yokoya
What must be considered? (4) Tunnel shape/size Shielding wall Local shielding in e+ target region, collimator region estimation by positron group Laser hut But don’t go into detail of CFS ADI, 2015-1210, Yokoya
What must be considered? (5) Must take into account Installation path Where are the access halls? CFS, cryogenics Commissioning scenario Human access when positron beam is on?? Ewan Safety issues Possible accidents Must work with close link to CFS, BDS, positron Else?? ADI, 2015-1210, Yokoya
Central Region Redundancy From Ewan’s slides at LCWS TDR Electron source 2 guns, 2 lasers Buncher: spare klystron 5GeV booster : 21 cryomodules + 3 spare, spare klystron Energy compressor: 2x5MW klystrons installed Positron Spare undulator? Spare target, flux concentrator, capture section Warm RF, booster linac, ECS ? ALL OF THE ABOVE NEED TO BE, UPDATED, AGREED UPON TO BE CONSISTENT WITH CFS LAYOUTS AND LATTICE, AND ARE INDEPENDENT OF THE DISCUSSION OF A THINNER SHIELD WALL OR TUNNEL CROSS-SECTION . AUXILLIARY OR ALTERNATIVE E+ SOURCE DESIGNS WILL HAVE A LARGE LOCAL (over 1 or 2 km) IMPACT ON THE LATTER. ADI, 2015-1210, Yokoya
Next meeting 2016 Jan. 5 23:00 Japan, 15:00 Europe, 6:00 west coast ADI, 2015-1210, Yokoya