US LHC Accelerator Research Program BNL FNAL LBNL

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US LHC Accelerator Research Program BNL - FNAL- LBNL - SLAC Collimation Overview 1)

US LHC Accelerator Research Program BNL - FNAL- LBNL - SLAC Collimation Overview 1) Short Status Report • Rotatable Collimator • T 980 Crystal Collimation at Tevatron • UA 9 Crystal Collimation at SPS 2) Critical Issues • Cost to complete, schedule, technical risk, interface with CERN plans & activities, APL, FY 10 and beyond, …. 28 October 2008 LARP CM 11, Fermilab Tom Markiewicz/SLAC LARP CM 11 - 28 October 2008 Collimation Summary - T. Markiewicz

Rotatable Collimator 1. Build one collimator jaw and test with 10 k. W resistive

Rotatable Collimator 1. Build one collimator jaw and test with 10 k. W resistive heaters to verify thermo-mechanical performance: COMPLETE 2. Build a full working 2 -jaw collimator and after lab qualification, subject it to beam tests at CERN: IN PROGRESS • Robustness in new devoted beamline • Performance LARP CM 11 - 28 October 2008 beam 2 beam Collimation Summary - T. Markiewicz

Final Jaw Braze 22 April 2008 LARP CM 11 - 28 October 2008 3

Final Jaw Braze 22 April 2008 LARP CM 11 - 28 October 2008 3 Collimation Summary - T. Markiewicz

Machine Flat Facets and Groove for Heater Test Final brazing was a success! •

Machine Flat Facets and Groove for Heater Test Final brazing was a success! • Flat facets and grooves for heater tests and thermocouple holes have been machined. • Within 25 micron tolerance along facet surface. LARP CM 11 - 28 October 2008 4 Collimation Summary - T. Markiewicz

10 k. W External Heater Thermal Test Setup Jaw in support stand Heaters strapped

10 k. W External Heater Thermal Test Setup Jaw in support stand Heaters strapped on jaw Extra heater Heater cable Water flow tube Water flow control LARP CM 11 - 28 October 2008 5 Collimation Summary - T. Markiewicz

Comparison of Sagitta & Temperature with ANSYS as a function of angle with respect

Comparison of Sagitta & Temperature with ANSYS as a function of angle with respect to heater • Jaw with two 5 k. W heaters modeled • Includes accurate representation of • Water flow/temp change • Material properties • Thermal expansion • Heat flow / thermal conductivity • Data ~10% larger than ANSYS LARP CM 11 - 28 October 2008 6 Collimation Summary - T. Markiewicz

Results of Bake-Out test: 1. 2 E-09 torr for 1 jaw in a vacuum

Results of Bake-Out test: 1. 2 E-09 torr for 1 jaw in a vacuum vessel and Clean RGA after “standard” PEP-II 200°C Process Zero hydrocarbons (mass >40) N 2 CO 2 LARP CM 11 - 28 October 2008 7 Collimation Summary - T. Markiewicz

Final Prototype Construction Material, fabrication & contracts for jaws in progress – We are

Final Prototype Construction Material, fabrication & contracts for jaws in progress – We are planning for enough parts for 3 jaws when 2 are needed – 6 Moly half shafts ordered July 17; 3 arrive (damaged) Oct 13 – Large order of Glidcop for jaws placed Oct 2 with Dec 9 delivery – Multi-stage contract for mandrel (and all other) precision machining being negotiated: critical path: bids hopefully Nov 17 Design changes to jaw support and jaw fabrication procedure RF impedance tests/calculations & continually evolving RF design LARP CM 11 - 28 October 2008 8 Collimation Summary - T. Markiewicz

RF Design Short RF Test Jaw with End Socket mounted Bearing Race UNDER STUDY

RF Design Short RF Test Jaw with End Socket mounted Bearing Race UNDER STUDY • Contact Resistance Measurements • Stretched Wire Impedance Measurements • Trapped mode study using Omega 3 P Si. N 4 balls Low resistance RF contact Slot for Spiral RF Spring LARP CM 11 - 28 October 2008 9 Collimation Summary - T. Markiewicz

T 980 Crystal Collimation at Tevatron Greatly improved T 980 hardware and beam diagnostics

T 980 Crystal Collimation at Tevatron Greatly improved T 980 hardware and beam diagnostics installed in the Tevatron tunnel on August 28, 2008 LARP CM 11 - 28 October 2008 10 Collimation Summary - T. Markiewicz

T 980 Crystal Collimation at Tevatron First End-of-Store studies on Sept 14 and Oct

T 980 Crystal Collimation at Tevatron First End-of-Store studies on Sept 14 and Oct 3, 2008 • Crystal aligned • First angle scan produces channeling results! Fixes and improvements in the tunnel on Oct. 23. Request for next EOS for October 30 -31. LARP CM 11 - 28 October 2008 11 Collimation Summary - T. Markiewicz

T 980 Crystal Collimation at Tevatron Management Discussions Support of Phase I goals/plans (until

T 980 Crystal Collimation at Tevatron Management Discussions Support of Phase I goals/plans (until Spring 2009): Measure channeled, volume-reflected and scattered beams as well as beam losses downstream of the crystal setup in comparison with simulations. Demonstrate reproducible beam loss reduction in the B 0 and D 0 in comparison with simulations, aiming at a routine use of crystal -based collimation in the Tevatron stores. Plans for Phase II (>Spring 2009) are subject to another review and 2009 -2010 Collider Run plans. LARP CM 11 - 28 October 2008 12 Collimation Summary - T. Markiewicz

Interplay and Timecales of T 980 and UA 9 LARP CM 11 - 28

Interplay and Timecales of T 980 and UA 9 LARP CM 11 - 28 October 2008 13 Collimation Summary - T. Markiewicz

UA 9: Crystal Collimation at SPS Post CM 10, executive decision to commit $200

UA 9: Crystal Collimation at SPS Post CM 10, executive decision to commit $200 k of FY 08 “uncommitted funds” to SPS Crystal experiment – Synergy of equipment and people – Secure single particle crystal study in event Tevatron Phase II of T 980 does not happen – US to provide Roman Pot#2 ($100 k) and detectors ($100 k) LARP CM 11 - 28 October 2008 14 Collimation Summary - T. Markiewicz

Progress & Plans of UA 9 Roman Pot#2: ballistic – SLAC engineers modify detector

Progress & Plans of UA 9 Roman Pot#2: ballistic – SLAC engineers modify detector mount and overall dimensions of existing RP design, begin buying vacuum components, contract mechanical designer, US and European vendors Silicon detectors, PIN Diodes: – Discussions in progress, mediated by Peggs • Como group (Prest) for silicon detectors • FNAL (Mokhov, Tsesarek) for PIN diode system Administrative: MOUs, Team $ accounts: In progress Collaboration: 2 circles of communication – Weekly WEBEX with SLAC, BNL, CERN – Asynchronous bilateral interactions between BNL, CERN, SLAC, INFN – Physics studies, prep for data analysis, etc. LARP CM 11 - 28 October 2008 15 Collimation Summary - T. Markiewicz

LARP CM 11 - 28 October 2008 16 Collimation Summary - T. Markiewicz

LARP CM 11 - 28 October 2008 16 Collimation Summary - T. Markiewicz

LARP CM 11 - 28 October 2008 17 Collimation Summary - T. Markiewicz

LARP CM 11 - 28 October 2008 17 Collimation Summary - T. Markiewicz

LARP CM 11 - 28 October 2008 18 Collimation Summary - T. Markiewicz

LARP CM 11 - 28 October 2008 18 Collimation Summary - T. Markiewicz

LARP CM 11 - 28 October 2008 19 Collimation Summary - T. Markiewicz

LARP CM 11 - 28 October 2008 19 Collimation Summary - T. Markiewicz

Issues Critical to ALL of LARP Rotatable collimator has been single costliest Accelerator System

Issues Critical to ALL of LARP Rotatable collimator has been single costliest Accelerator System activity in FY 2008 and FY 2009 (950 k$ each year) ~1/3 of the Accelerator Systems budget “Hard Deliverable” of functioning prototype due just early in FY 2010 LARP highly desires – “On time, under budget” completion – Technical success What are risks and how do we manage them? Post Prototype Delivery Collimation Program – Continued involvement in Phase II Collimation project • If RC chosen for some of the 30 Phase II slots • If RC not Chosen • LARP or APL? LARP CM 11 - 28 October 2008 20 Collimation Summary - T. Markiewicz

Performance Risks ü Will thermal-mechanical testing of the first jaw validate the shaft-hubjaw design

Performance Risks ü Will thermal-mechanical testing of the first jaw validate the shaft-hubjaw design that should limit maximum jaw deflection into the beam area to 230 microns for 10 second bursts of 60 k. W beam absorption ü Will the mechanical accuracy of the device be adequate (40 um) ü Will the basic jaw-adjustment and jaw-rotation work as planned • Will the effective impedance and RF characteristics of the jaw and the transition to the vacuum tank aperture be adequate ü Will the device vacuum be sufficiently low • When damaged by an aborted beam, will the extent of damage be sufficiently localized to allow rotation to a clean surface, as planned LARP CM 11 - 28 October 2008 21 Collimation Summary - T. Markiewicz

Issues (1) RC project targets end of CY 09 LHC run as delivery date

Issues (1) RC project targets end of CY 09 LHC run as delivery date for prototype – Technical problems always as possibility • Example: For test jaw 1 st mandrel destroyed by vendor and 2 nd mandrel damaged, but recovered, in a brazing faux pas • Example: Production shafts arrive late, incomplete & damaged Planning of High Intensity Test Beam (TT 60) for robustness tests beginning – Completion targeted for 2010 – Tests in 2010 -2011 (6 -9 months later than current plan) SLAC had de-scoped to one test jaw and one prototype, need to plan for what gets destructively tested and what can be tested in LHC – 2 prototypes? – 1 prototype and a hunk of copper in a 2 nd vacuum tank w/steppers? – Removable insert for robustness tests + full prototype? LARP CM 11 - 28 October 2008 22 Collimation Summary - T. Markiewicz

Issues (2) Technical inadequacy of SLAC design – Scope creep: Integrated BPMs part of

Issues (2) Technical inadequacy of SLAC design – Scope creep: Integrated BPMs part of CERN design, not (yet) SLAC’s – (Mis)communication: Respect all agreements: ü No braze joints in vacuum ü No Beryllium ü 1 E-9 level vacuum Ø Cu-Ni tubing instead of OFE Copper for water cooling Ø Improved external mechanics and lessons learned from Phase I – Written & signed technical handshake advised Interface with APL • New tertiary collimators: no idea what • Phase II secondaries: state mission need as placeholder • Phase II primaries: 1 st mention (for me) • Cryo-collimators: CERN-GSI only • Advanced: Crystal, Electron lens not in APL, R&D continues LARP CM 11 - 28 October 2008 23 Collimation Summary - T. Markiewicz

Issues (3): Future T 980 and UA 9 – Natural tendency is to continue

Issues (3): Future T 980 and UA 9 – Natural tendency is to continue this research up to and including installation of crystal ‘scrapers’ in LHC – After FY 08 -09 M&S outlay, budget is (as usual) manpower & travel – Whether, when or how to sunset this activity RC: as planned and often shown 2009: Finish all parts and assemble into a vacuum tank compatible with Phase I adjustment mechanism = RC; Mechanically test RC, ship and install in SPS/LHC 2010: Collimator tests at LHC & Final drawing package for CERN 2011: Await production & installation of chosen design(s) by CERN 2012: Commissioning support LARP CM 11 - 28 October 2008 24 Collimation Summary - T. Markiewicz