On the Magnetic-field Requirements for the LC TPC

07/03/200807/03/2008 Ron Settles MPI-Munich ILDMeetiRon Settles MPI-Munich ILDMeeting@Sendai: TPC B-fieldng@Sendai: TPC B-field

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On the Magnetic-field On the Magnetic-field Requirements for the LC Requirements for the LC

TPC TPC

OUTLINE of TALKOUTLINE of TALK

• Status of DiscussionStatus of Discussion• Magnetic-field issueMagnetic-field issue

-The systematic uncertainty-The systematic uncertainty-The B-field Map for the LC TPC-The B-field Map for the LC TPC

• The Aleph B-MapThe Aleph B-Map• Recommendations and IdeasRecommendations and Ideas

OUTLINE of TALKOUTLINE of TALK

• Status of DiscussionStatus of Discussion• Magnetic-field issueMagnetic-field issue

-The systematic uncertainty-The systematic uncertainty-The B-field Map for the LC TPC-The B-field Map for the LC TPC

• The Aleph B-MapThe Aleph B-Map• Recommendations and IdeasRecommendations and Ideas


22

e.g.with precision measurements of theHiggs

e.g.with precision measurements of theHiggs

cmE recHM Expt (GeV) Decay

Channel (GeV/c2) ln(1+s/b)

115 GeV/c2

1 ALEPH 206.7 4-jet 114.3 1.73

2 ALEPH 206.7 4-jet 112.9 1.21

3 ALEPH 206.5 4-jet 110.0 0.64

4 L3 206.4 E-miss 115.0 0.53

5 OPAL 206.6 4-jet 110.7 0.53

6 Delphi 206.7 4-jet 114.3 0.49

7 ALEPH 205.0 Lept 118.1 0.47

8 ALEPH 208.1 Tau 115.4 0.41

9 ALEPH 206.5 4-jet 114.5 0.40

10 OPAL 205.4 4-jet 112.6 0.40

Goal: to revisit the Higgs…Goal: to revisit the Higgs…


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On the Magnetic-field Requirements for the LC TPC……On the Magnetic-field Requirements for the LC TPC……

STATUS OF DISCUSSIONSTATUS OF DISCUSSION• Dan Peterson and I presented two different viewpoints at Dan Peterson and I presented two different viewpoints at an LDC meeting at Snowmass05.an LDC meeting at Snowmass05.• Both of these viewpoints are based on simplified Both of these viewpoints are based on simplified arguments to help understand the effects.arguments to help understand the effects.• Here are mine: “back-of-the envelope” must be done Here are mine: “back-of-the envelope” must be done carefully.carefully.• Christian Grefe is analyzing the field map for the LP Christian Grefe is analyzing the field map for the LP which will be testing some of these ideas. which will be testing some of these ideas. • Simuation work can help understand more details of the Simuation work can help understand more details of the issue.issue.

STATUS OF DISCUSSIONSTATUS OF DISCUSSION• Dan Peterson and I presented two different viewpoints at Dan Peterson and I presented two different viewpoints at an LDC meeting at Snowmass05.an LDC meeting at Snowmass05.• Both of these viewpoints are based on simplified Both of these viewpoints are based on simplified arguments to help understand the effects.arguments to help understand the effects.• Here are mine: “back-of-the envelope” must be done Here are mine: “back-of-the envelope” must be done carefully.carefully.• Christian Grefe is analyzing the field map for the LP Christian Grefe is analyzing the field map for the LP which will be testing some of these ideas. which will be testing some of these ideas. • Simuation work can help understand more details of the Simuation work can help understand more details of the issue.issue.


44

Prepared LC Note at Snowmass05 Prepared LC Note at Snowmass05

time…time…

…based on experience with Aleph TPC

Is being updated now


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Physics determines Physics determines detector designdetector design

momentum: d(1/p) ~.9x10-5/GeV (TPC only)

~ .3x10-5/GeV(w/IP) (1/10xLEP)

e+e-ZHllX goal: eV

tracking efficiency: 98% (overall)

excellent and robust tracking efficiency by

combining vertex detector and TPC, each with excellent tracking efficiency


66

TPC central-tracker TPC central-tracker tasks tasks

ISSUES

– Performance/Simulation – Design – Backgrounds, alignment, corrections


77

Snowmass05 list of performance/simulation Snowmass05 list of performance/simulation issues is being revisited for the ILD issues is being revisited for the ILD

optimizationoptimization – Momentum precision needed for overall

tracking? – Momentum precision needed for the TPC? – Arguments for dE/dx, Vº detection– Requirements for

• 2-track resolution (in rφ and z)? • track-gamma separation (in rφ and z)?

– Tolerance on the maximum endplate thickness? – Tracking configuration

• Calorimeter diameter • TPC • Other tracking detectors

– TPC outer diameter – TPC inner diameter – TPC length– Required B-mapping accuracy in case of non-

uniform B-field?


88

Performance: LC Note LC-DET-2007-005 Performance: LC Note LC-DET-2007-005

w/ MPGD!


99

The systematic uncertaintyThe systematic uncertainty


1010


•So, I started writing this note aggressively assuming the linear model and δx

o ≡ δσ

o

=

10μm.

• When I showed an early draft to Dean, he said, “you should add them quadratically”

• This is correct as you see next…


1111


(θ denotes azimuthal angle in this paper)

Aleph Note by Steve Thorn: ALEPH 94-162, PHYSIC 94-138


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The B-field

http://wisconsin.cern.ch/~wiedenma/TPC/Distortions/CERN_LC.pdf


1313

The B-field



1414



1515

The B-field

Corrections exact if B-field known exactly; so what must B accuracy be?

The relevant equations for movement of drifting electrons in B-field



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The B-field

The ‘standard’ TPC requirement for the B-field homogeneity has been (from the LC Note):

The B-field

The ‘standard’ TPC requirement for the B-field homogeneity has been (from the LC Note):


1717

From the LC Note…

◦


1818

From the LC Note…

◦


1919

From the LC Note…

◦


2020

From the LC Note…

◦


2121

The Aleph B-map…


2222

From the LC Note…

Problems: - Different coil configuration between mapping and running

- Hall plate drifts

- Temperature drifts

Aleph should have taken more time for the calibration of various effects and mapped with more configurations.


2323

B-field Map for the ILD

Aleph map-accuracy good enough for the LC TPC, be we can profit from experience and do better:

• Lay out map to achieve better than 0.2‰ as was originally planned in Aleph.

• Construct main detector coil to adhere to ‘2mm condition’.

• Establish tolerances with careful simulation:

• Do same for stray fields of MDI magnets.

• Mount matrix of Hall plates on LCTPC to monitor/check while running.

• Devise model including all material to compare with Hall-plate matrix.

On the Magnetic-field Requirements for the LC TPC

Text of On the Magnetic-field Requirements for the LC TPC

LC-TPC R&D

LC TPC R&D Results Cornell WS July 2003 1 Selected LC TPC R&D Results (DESY RPC) for the Cornell WS July 2003 The LC TPC R&D Groups of the PRC R&D-01/03

04.03.2009, DPG-Tagung, [email protected] U. Renz für die LC-TPC Kollaboration

Development of a TPC for the Future Linear Collider on behalf of the LC TPC groups Aachen, Berkeley, Carleton, Cracow, DESY, Hamburg, Karlsruhe, MIT, Montreal,

TPC-2206/TPC-2212/TPC-2215 User Manual - National … · ©National Instruments Corporation vii TPC-2206/TPC-2212/TPC-2215 User Manual Contents Chapter 1 General Information Introduction

UTA, Jan. 9-11, 2003M. Ronan LC-TPC R&D1 LC-TPC R&D GEM, MicroMEGAS and MWPC techniquesGEM, MicroMEGAS and MWPC techniques Preliminary studiesPreliminary

TPC Integration P. Colas (thanks to D. Attié, M. Carty, M. Riallot, LC-TPC…) TPC layout(s) Services Power dissipation Endplate thickness and cost Mechanical

Correction Methods for TPC Operation in Inhomogeneous ...flc.desy.de/lcnotes/notes/LC-DET-2010-001.pdf · Correction Methods for TPC Operation in Inhomogeneous Magnetic Fields Peter

R&D plan for ILC （ ILD) TPC in 2010 - 2012 (LC TPC Collaboration)

LBNL LC-TPC Activities

FIRST TEST RESULTS FROM A MICROMEGAS LARGE TPC PROTOTYPE P. Colas (CEA Saclay), on behalf of the LC-TPC collaboration Micromegas with resistive anode:

D. Peterson, “Studies with the Cornell/Purdue Prototype TPC”, Vancouver LC Workshop, 20-07-2006 1 Studies with the Cornell/Purdue Prototype TPC Information

Beijing, Feb.6, 2007 P. Colas - Micromegas TPC 1 Micromegas TPC studies in a 5 Tesla magnetic field with a resistive readout D. Attié, A. Bellerive, K

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October-2007 1 Discussion for the LP endplate See also: dpp/linear_collider/LargePrototype.html

Study of GEM-TPC Performance in Magnetic Fields

23/08/2005 Ron Settles MPI-Munich/DESY Snowmass2005 TPC Large Prototype1 TPC R&D, Tasks towards the Design of the ILC TPC LC TPC R&D Groups OUTLINE of

Test beam performance of MPGD-TPC readout concept of charge dispersion in a magnetic field

Selected LC TPC R&D Results (DESY RPC) for the Cornell WS July 2003

TPC - E TPC-E Benchmark Overview TPC-PR Subcommittee Feb 2007 © 2007 TPC

Takeshi Matsuda LC TPC Collaboration IPNS/KEK@TILC08 March 5, 2008 TPC Endcap Materials

Single-module tests of a Micromegas TPC for the LC

Issues for the LC-TPC design and their feedback to the R&D ...settles/VancouverTPCtalkJuly2006.pdf · 10 OPAL 205.4 4-jet 112.6 0.40 Goal: to build a high-performance TPC as central

GEM-TPC Resolution Studies ECFA/DESY LC Workshop Prague, November 2002 Dean Karlen University of Victoria / TRIUMF

TPC for LC

2/9/04 1 LBNL LC-TPC Activities ● International LC-TPC R&D ● Physics and Detector Simulations ● Micromegas-based TPC R&D ● US-Japan TPC R&D Proposal ●

Preparations for a Simulation Study of the Magnetic Field Requirements of the LC TPC

R&D plan for ILC ILD) TPC in 2010 -2012dpp/linear_collider/images/talks... · R&D plan for ILC （ILD) TPC in 2010 -2012 (LC TPC Collaboration) LCWA09 Tracker Session 02 October 2009

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On the Magnetic-field Requirements for the LC TPC

Text of On the Magnetic-field Requirements for the LC TPC