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Collimation Overview 28 October 2008 LARP CM11, Fermilab Tom Markiewicz/SLAC BNL - FNAL- LBNL - SLAC US LHC Accelerator Research Program 1) Short Status Report Rotatable Collimator T980 Crystal Collimation at Tevatron UA9 Crystal Collimation at SPS 2) Critical Issues Cost to complete, schedule, technical risk, interface with CERN plans & activities, APL, FY10 and beyond, ….

Collimation Overview

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US LHC Accelerator Research Program. BNL - FNAL- LBNL - SLAC. Collimation Overview. Short Status Report Rotatable Collimator T980 Crystal Collimation at Tevatron UA9 Crystal Collimation at SPS Critical Issues - PowerPoint PPT Presentation

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Page 1: Collimation Overview

Collimation Overview

28 October 2008

LARP CM11, Fermilab

Tom Markiewicz/SLAC

BNL - FNAL- LBNL - SLAC

US LHC Accelerator Research Program

1) Short Status Report

• Rotatable Collimator

• T980 Crystal Collimation at Tevatron

• UA9 Crystal Collimation at SPS

2) Critical Issues

• Cost to complete, schedule, technical risk, interface with CERN plans & activities, APL, FY10 and beyond, ….

Page 2: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 2 / 32

Rotatable Collimator

1. Build one collimator jaw and test with 10kW 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

beambeam

Page 3: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 3 / 32

Final Jaw Braze 22 April 2008

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LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 4 / 32

Machine Flat Facets and Groove for Heater Test

Final brazing was a success!

•Flat facets and grooves for heater tests and thermocouple holes havebeen machined.•Within 25 micron tolerance along facet surface.

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LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 5 / 32

10kW External Heater Thermal Test Setup

Heater cable

Water flow control

Jaw in support stand

Heaters strapped on jaw

Water flow tube

Extra heater

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LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 6 / 32

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

•Jaw with two 5 kW heaters modeled•Includes accurate representation of

•Water flow/temp change•Material properties•Thermal expansion•Heat flow / thermal conductivity

•Data ~10% larger than ANSYS

Page 7: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 7 / 32

Results of Bake-Out test: 1.2E-09 torr for 1 jaw in a

vacuum vessel and Clean RGA after “standard” PEP-II 200°C

Process

N2

CO2

RC Test Jaw Vacuum Bakeout Test

1.00E-10

1.00E-09

1.00E-08

1.00E-07

1.00E-06

0.050.0100.0150.0

Temp (°C)

Pre

ssu

re (

Tor

r)

Zero hydrocarbons (mass >40)

Page 8: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 8 / 32

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

Page 9: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 9 / 32

RF Design

Low resistance RF contact

Slot for Spiral RF Spring

Short RF Test Jaw with End Socket mounted

Bearing Race

SiN4 balls

UNDER STUDY

•Contact Resistance Measurements

•Stretched Wire Impedance Measurements

•Trapped mode study using Omega3P

Page 10: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 10 / 32

T980 Crystal Collimation at Tevatron

Greatly improved T980 hardware and beam diagnostics installed in the Tevatron tunnel on August 28, 2008

Page 11: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 11 / 32

T980 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.

Page 12: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 12 / 32

T980 Crystal Collimation at Tevatron

Management DiscussionsSupport 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 B0 and D0 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.

Page 13: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 13 / 32

Interplay and Timecales of T980 and UA9

Page 14: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 14 / 32

UA9: Crystal Collimation at SPS

Post CM10, executive decision to commit $200k of FY08 “uncommitted funds” to SPS Crystal experiment– Synergy of equipment and people– Secure single particle crystal study in event Tevatron Phase II of

T980 does not happen– US to provide Roman Pot#2 ($100k) and detectors ($100k)

Page 15: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 15 / 32

Progress & Plans of UA9

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.

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Issues Critical to ALL of LARP

Rotatable collimator has been single costliest Accelerator System activity in FY2008 and FY2009 (950k$ each year)

~1/3 of the Accelerator Systems budget

“Hard Deliverable” of functioning prototype due just early in FY2010

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?

Page 21: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 21 / 32

Performance Risks

Will thermal-mechanical testing of the first jaw validate the shaft-hub-jaw design that should limit maximum jaw deflection into the beam area to 230 microns for 10 second bursts of 60kW beam absorption

Will the mechanical accuracy of the device be adequate (40 um)

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

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

Page 22: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 22 / 32

Issues (1)

RC project targets end of CY09 LHC run as delivery date for prototype– Technical problems always as possibility

• Example: For test jaw 1st mandrel destroyed by vendor and 2nd mandrel damaged, but recovered, in a brazing faux pas

• Example: Production shafts arrive late, incomplete & damaged

Planning of High Intensity Test Beam (TT60) 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 2nd vacuum tank w/steppers?– Removable insert for robustness tests + full prototype?

Page 23: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 23 / 32

Issues (2)

Technical inadequacy of SLAC design– Scope creep: Integrated BPMs part of CERN design, not (yet) SLAC’s– (Mis)communication: Respect all agreements:

No braze joints in vacuum No Beryllium 1E-9 level vacuum Cu-Ni tubing instead of OFE Copper for water cooling 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: 1st mention (for me)• Cryo-collimators: CERN-GSI only• Advanced: Crystal, Electron lens not in APL, R&D continues

Page 24: Collimation Overview

LARP CM11 - 28 October 2008 Collimation Summary - T. MarkiewiczSlide n° 24 / 32

Issues (3): Future

T980 and UA9– Natural tendency is to continue this research up to and including

installation of crystal ‘scrapers’ in LHC– After FY08-09 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