Lab Update Rolf Ent - Home | Jefferson Lab · 2015. 1. 16. · Measurement of the Parity-Violating Asymmetry in eD Deep Inelastic Scattering (a [2C1u – C 1d] + [2C 2u – C 2d])

Lab Update

Rolf Ent

Hall C Users Meeting January 15-16, 2015

Measurement of the Parity-Violating Asymmetry in

eD Deep Inelastic Scattering

(a [2C1u – C1d] + [2C2u – C2d])

• The present result leads to a determination of the effective

electron-quark weak coupling combination 2C2u – C2d that is

five times more precise than previously determined.

• It is the first experiment to isolate, when combined with

previous experiments like Qweak, a non-zero C2q (at 95%

confidence level).

• This coupling describes how much of the mirror-symmetry

breaking in the electron-quark interaction originates from the

quarks' spin preference in the weak interaction. The result

provides a mass exclusion limit (L) on the electron and

quark compositeness and contact interactions of ~5 TeV.

Nature 506, 67–70 (06 February 2014) The Jefferson Lab PVDIS Collaboration See also News & Views, Nature 506, 43–44 (06 February 2014)

Longitudinally Polarized Electron Scattering from Unpolarized Deuterium

SLAC E122

JLab PVDIS

Hall C Users Meeting, January 15-16 2015 2


Momentum Sharing in Imbalanced Fermi Systems

O. Hen et al., Science 346 (2014) 614, doi:10.1126/science.1256785

The Jefferson Lab CLAS Collaboration Selected for Science Express (16 October 2014)

• At momentum greater than the Fermi momentum (kf), the fraction

of proton-neutron pairs dominates in atomic nuclei. It was recently

found that even in neutron-rich heavy nuclei proton-neutron pairs

dominate over proton-proton and by inference neutron-neutron

pairs [1].

• The implication of this pairing is that, even if there are far more

neutrons than protons in nuclei, the proton momentum above kf is

near-identical to that of the neutron – the momentum is shared.

• This is confirmed in nuclear theory calculations for light nuclei [2],

and results in an on average higher proton than neutron

momentum, as suggested for neutron-rich nuclei [3].

This is completely unlike the effects for non-interacting Fermions in a

mean field, and has implications for the equations of state of neutron

stars and atomic interactions in ultra-cold atomic gases.

[1] The data were analyzed by the CLAS Data Mining Initiative.

[2] R. Wiringa et al., Phys. Rev. C 89, 024305 (2014)

[3] M. Sargsian, arXiv:1210.3280 (2012); PRC 89, 034305 (2014)

CEBAF Large Acceptance Spectrometer (CLAS)

Theory and Computation Highlight New Technology + Innovative Techniques

0+

d0

h

pK

hK

pK

Ecm

MeV

2+

d2

h

hK

pK

Ecm

MeV

p

K K

p h , Lattice QCD Advance:

First scattering calculation of

Inelastic channels

Work on leadership GPU systems

such as DOE Titan (ORNL) and

NSF Blue Waters (NCSA - University of Illinois)

Large ASCR Computing Challenge Award

in May 2014: 250M core hours

Now published in PRL


Jefferson Lab CEBAF 12 GeV Upgrade

• Civil Construction essentially complete:

• Accelerator in commissioning:

• Hall A operational

• Hall D/GlueX operational (minor items still to complete)

– Commissioning in progress

• Hall B – detector installation, magnet construction

• Hall C – infrastructure installation, detectors ready, 1st SC magnet on site

with experiment readiness review January 21st, magnet construction

• Director’s Review, OPA Review, both in November 2014,

• Cost and Schedule Performance are an issue

Received CD-4A Approval ahead of schedule; ESAAB July 30, 2014

‘Accelerator Project Complete and Start of Operations’


CEBAF 2014 Commissioning


Jefferson Lab: Hall D Commissioning

• Hall D complex: facility for experiments with linearly polarized photon beam

• Main goal: search for gluonic excitations in light meson spectra (experiment GlueX)

• Photon beam line + large acceptance spectrometer for charged particles & photons

• Commissioning with beam Nov. & Dec. 2014: KPP have been demonstrated

e- e- e- e- γ γ

Tagger station Tagger station

Hall D Experiment Hall D Experiment

Target location Target location

Z,cm Z,cm γγ mass, GeV γγ mass, GeV

π°→γγ π°→γγ

Event Display Event Display

Electromagnetic calorimeters Electromagnetic calorimeters

Drift chambers Drift chambers

Spectrometer in solenoidal magnetic field Spectrometer in solenoidal magnetic field

Neutral particles

reconstruction

Neutral particles

reconstruction

Charged

particles

tracking

Charged

particles

tracking

Vertex reconstruction Vertex reconstruction


Early Science of 12 GeV Era in Halls A and B

DVCS: A High impact experiment for 3D nucleon imaging

• Deeply Virtual Compton Scattering (DVCS) provides

access to Generalized Parton Distributions (GPDs)

• Demonstration of scaling critical to full JLab 12 GeV

GPD program

Runs concurrently with a high Q2 Form Factor GMp

experiment

• Enabling experiment for High Impact SBS program

7 graduate thesis students on site taking data

DVCS Heavy Photons Search (HPS)

HPS: High impact experiment to search for the proposed

carrier of Dark Matter interacting with Light Matter.

Test Run in December 2014 successfully completed.

Commissioned beam line and the e.m. calorimeter

Funded by DOE HEP and NP.

The peak from elastic

electron-platinum

scattering is used to

calibrate the response

of the 420 lead-

tungstate crystals.

Count rate in individual

crystals located near

the beam (below)

shows the experiment

can achieve its

objective to run at high

luminosity.


12 GeV Approved Experiments by Physics Topics

Topic Hall A Hall B Hall C Hall D Other Total

The Hadron spectra as probes of QCD

(GluEx and heavy baryon and meson spectroscopy) 1 3 4

The transverse structure of the hadrons

(Elastic and transition Form Factors) 5 3 2 1 11

The longitudinal structure of the hadrons

(Unpolarized and polarized parton distribution functions) 2 3 6 11

The 3D structure of the hadrons

(Generalized Parton Distributions and Transverse

Momentum Distributions)

5 9 7 21

Hadrons and cold nuclear matter

(Medium modification of the nucleons, quark hadronization,

N-N correlations, hypernuclear spectroscopy, few-body

experiments)

6 3 7 1 17

Low-energy tests of the Standard Model and Fundamental

Symmetries 3 1 1 1 6

TOTAL 21 20 22 5 2 70


PAC43 & PAC Proposal Submission

• Call for new proposals for PAC43 has been sent to cuga

• Deadline proposal submission: May 18 by 8 am (EDT).

Deadline will be strict as last time

• Will ask more detailed information on collaboration list

to be able to better deal with annual user call from DOE

(e.g. there are many Mark Jones’s, people do change

affiliation). We need a good database we can track of

user/affiliation/experiment. We are still considering how

to make this easiest for all.

• PAC43 meeting scheduled for week of July 6-10


PAC Membership

• Retired this year:

– N. Makins

– M. Vanderhaegen

– J. Ahrends

– B. Sherrill

• New members starting next year:

– R. Fatemi

– F. Maas

– D. Dean

– W. Vogelsang

• New PAC Chair: J. Napolitano


Federal Budget FY15

• FY15 President’s Budget Request supports ~ 20 weeks running

• House Markup supported increase to ~ 27 weeks running

• Senate Markup supported increase to ~ 30 weeks running

• ONP encouraged us in our efforts to run for commissioning and physics

• In turn, we were pleased by this recognition of our need, support from

users was important

• But in the end, Omnibus appropriation provided only +$1M as

compared to President’s Budget Request:

Therefore we are planning on a spring run from Feb 13 to May 4

(compared to the tentative schedule, we did work out to run

beyond April 3 – see note 4 of scheduling memo)


Experiment Scheduling

Nominal Dates for Scheduling Process June 1 Call for Scheduling (Beam Time) Request

June 30 Deadline for Scheduling Request Submissions

September 1 Draft 18-Month Schedule Released

September 15 Deadline for Input of User Community on Draft Schedule

October 1 18-Month Schedule Released

Year 1 January – June Schedule Reaffirmed

Year 1 July – December Firm Schedule

Year 2 January – June Tentative Schedule

March 1 Draft 18-Month Schedule Released

March 15 Deadline for Input of User Community on Draft Schedule

April 1 18-Month Schedule Released

Year 1 July – December Schedule Reaffirmed

Year 2 January – June Firm Schedule

Year 2 July – December Tentative Schedule

• Experiment scheduling process re-started

• 1 scheduling request per year Experiments can only submit requests when floor layouts frozen (passed the readiness review) and construction near-final

• Schedule will remain rough and tentative, to fold in: o 12 GeV pre-ops o establishing robust accelerator

operations o budget uncertainties

Indeed, FY15 budget forces us to stop FY15 run by May 4.

• Setting priorities amongst Halls/experiments will still be important to avoid conflicts


15-Months Schedule Released

Oct 2014 - Dec 2015

• http://www.jlab.org/exp_prog/experiment_schedule/

• This schedule covers the

first experiment run period

of the “12 GeV Era’’ to be

executed in parallel with

the Accelerator

Commissioning and

Development necessary

to bring the machine to its

design performance and

meet the 12 GeV JLab

upgrade project goals.

• We plan to release the March 2015 – July 2016 schedule in February

• Anticipating Hall A PREX & Integrated engineered Tritium target/beam

line, Hall B/Prad, and DarkLight readiness reviews before June 1

• Hall C not required this time around


Long-Range Plan Town Meetings

• Computational Nuclear Physics July 14,15 SURA

• Education and Innovation, Aug. 6-8, NSCL, Michigan

State U.

• Nuclear Structure and Nuclear Astrophysics, August 21-23

Texas A&M U.

• QCD (Hadronic & Relativistic Heavy Ion), Sept 13-15,

Temple U.

• Fundamental Symmetries, Sept 28, 29, Chicago O’Hare

Good JLab participation in all meetings


• Recommendation 1:

With highest priority, we recommend both completion of

construction and full operation of the 12 GeV CEBAF at the Thomas

Jefferson National Accelerator Facility, along with targeted

instrumentation investments, such as the SoLID and MOLLER

projects.

• Recommendation 2:

A high luminosity, high-energy polarized Electron Ion Collider (EIC)

is the highest priority of the U.S. Nuclear Physics QCD community

for new construction after FRIB. (voted jointly with Phases of QCD

community)

QCD and Hadron Physics


NSAC EIC Cost Review – Jan 26-28

From the Charge:

Understanding that a detailed conceptual design has not been completed, the

Subcommittee is asked to provide NSAC with its best current estimate of the

costs of the projects, including R&D, construction, pre-operating and operating

costs. NSAC is aware that there are uncertainties regarding siting and other

issues that limit the precision of such an estimate at this time. Nevertheless, the

advice of the Subcommittee will be of great value to NSAC as it evaluates the

relative merit of this and other initiatives. Since the charge to NSAC for the long

range plan explicitly discusses resources in terms of the 2015 President’s

Budget Request, we ask that the results of this review be presented in FY2015

dollars. If the laboratories choose to present staging options to incrementally

reach the science goals, please consider these as well.

The subcommittee is asked to provide a written report to NSAC by the end of

February 2015. I expect it will be considered by NSAC in a meeting in late

March 2015.


MEIC – present design

We have been balancing

minimization of cost and

technical risks, resulting in

an MEIC base design

change. Civil construction

costs in VA are with 12

GeV experience in hand

well-known, on the other

hand we have had issues

with SC magnets.

~2.2 km circumference

• electron-ring from PEP-II

• ion-ring with super-ferric

magnets

No high-energy booster

Tunnel already compatible

with a 250+ GeV upgrade


Lab Update Rolf Ent - Home | Jefferson Lab · 2015. 1. 16. · Measurement of the Parity-Violating Asymmetry in eD Deep Inelastic Scattering (a [2C1u – C 1d] + [2C 2u – C 2d])

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