Neutral Particle Spectrometer (NPS) + Compact Photon Source with - - PowerPoint PPT Presentation

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Neutral Particle Spectrometer (NPS) + Compact Photon Source with - - PowerPoint PPT Presentation

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Neutral Particle Spectrometer (NPS) + Compact Photon Source with Longitudinal & Transverse Polarized NH 2 Experiment Exp # Beam Target PAC Days Rating 0 SIDIS " E12-13-007 L H 2 26 A " DVCS and Exclusive

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SLIDE 1

Neutral Particle Spectrometer (NPS) + Compact Photon Source with Longitudinal & Transverse Polarized NH2

Hall C Winter Meeting Charles Hyde, Hall C Meeting, 28–29 Jan 2019

Experiment Exp # Beam Target PAC Days Rating π0 SIDIS E12-13-007 ⃗ "– L H2 26 A– DVCS and Exclusive π0 E12-13-010 ⃗ "– L H2 53 = (26)+27 A Wide Angle Compton Scattering (WACS) E12-14-003 "$, & L H2 18 A– Wide Angle Exclusive p0 photoproduction E12-14-005 "$, & L H2 (18) B Initial State Helicity Correlation in WACS E12-14-006 CPS: ⃗ & '() 31 B ALL & ALS Polarization Observables in WACS at large s, t, and u C12-17-008 CPS: ⃗ & '() 46 A– Timelike Compton Scattering (TCS) off a Transversely Polarized Proton C12-18-005 CPS: ⃗ & ['()]T 35 C2

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SLIDE 2

NPS Layout on SHMS Carriage

  • DVCS H(e,e’ g)p, Deep H(e,e’ p0)p

January 28, 2019 NPS C. Hyde 2

NPS cantelevered off SHMS platform NPS on SHMS platform

Detector Detector Magnet Magnet NPS angle range: 25 – 60 degrees NPS angle range: 5.5 – 30 degrees

  • g

p

  • e– to HMS

PbWO4 g-

  • WACS H(g, g p), Wide angle H(g, p0p)

Proton to HMS

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SLIDE 3

Sweep Magnet replaces SHMS Horizontal Bender

  • Looking upstream

Vertical bend ~0.3 Tm

  • 1cm steel septum between

0-field beam pipe and g- aperture (at smallest angle setting)

  • Ready for power, cooling
  • Magnetic field mapper

constructed at ODU

January 28, 2019 NPS C. Hyde 3

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SLIDE 4

PbWO4 Crystal Procurement 2x2x20 cm3

  • SICCAS (China): 460 received, 160 failed specs, returned for
  • replacement. Additional 52 below spec to be used at edges.
  • SICCAS: Contract to be signed for 400 more
  • Crytur (Czech Republic): 100 received, OK
  • Crytur: 250 crystals on order delivery ≤ October 2019
  • Supply limited by PANDA order
  • Raw material reserve exhausted

January 28, 2019 NPS C. Hyde 4

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SLIDE 5

PMTs from HyCal, New Active bases

  • Gain stabilization at high rates by amplifier fed from last stage of

HV divider.

  • PMT base assembly:

Ohio U.

  • Prototype assembly:

IPN-Orsay

January 28, 2019 NPS C. Hyde 5

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SLIDE 6

Calorimeter Assembly

  • Carbon fiber alveoli

cantilever crystals in place

January 28, 2019 NPS C. Hyde 6

S i g n a l c a b l e s t

  • 2

5 M H z F A D C Translation cards HV LED Ribbon

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SLIDE 7

Calorimeter Servicing

  • Access to remove any individual

PMT+Base module without disassembly

  • Module

disassembles from calo with a single screw

January 28, 2019 NPS C. Hyde 7

LED fiber Signal + HV ribbon jumper

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SLIDE 8

Compact Photon Source for Polarized Targets

  • Self-contained radiator,

forward collimator, & electron dump

  • Pure photon beam on NH3

Longer polarization lifetime Higher gp luminosity Transverse polarization

  • Dipole magnet, central Cu

absorber/dump, W powder and borated plastic radiation absorber.

  • CPS concept Jlab Internal

Review Committee 2018. Feasible and ready for detailed design

January 28, 2019 NPS C. Hyde 8

  • 1
m R
  • t
a r y S e a l 1 K L H e 1 M i c r
  • w
a v e s 3 8 L N 2 L H e M a g n e t R i n g s S c a t t e r i n g C h a m b e r T
  • P
u m p s R e f r i g e r a t
  • r
S u p p
  • r
t N M R P h
  • t
  • n
B e a m
  • n view of the polarized target to be used by t
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SLIDE 9

WACS Polarization Observables

  • UVA n NH3 target

100° longitudinal aperture 38° transverse aperture

  • ALL = KLL

Except when it doesn’t. Free elementary quark (diluted by polarization)

January 28, 2019 NPS C. Hyde 9

  • 1 m

Rotary Seal 1K LHe 100 Microwaves 38 LN2 LHe Magnet Rings Scattering Chamber To Pumps Refrigerator Support NMR Photon Beam

[deg]

cm

q

40 60 80 100 120 140 160 180

LL

& K

LL

A

0.4

  • 0.2
  • 0.0

0.2 0.4 0.6 0.8 1.0 1.2

LL

Miller A

LL

Miller K D-K (2013) Kroll (2017) K-V (2015) )

LL

JLab 6 GeV (K This Proposal (L1,L3 & L4 500 hours)

]

2

  • t [GeV

2 4 6 8 10

LS

= -K

LS

A

0.05

  • 0.00

0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40

D-K (2013) K-V (2016) Miller (2004) This Proposal (S1 50 hours) This Proposal (S4 300 hours) )

LS

JLab 6 GeV (K

  • Kroll, Miller =

handbag models (different off- shell)

  • K-V = SCET
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SLIDE 10

Timelike Compton Scattering

  • Access to E(x,t) Compton Formfactor with

transversely polarized target.

  • Quark Orbital Angular Momentum

January 28, 2019 NPS C. Hyde 10

N’ (p’) N (p) g (q)

*

g (q’) (k’)

+

e

(k)

  • e

N’ (p’) N (p) g (q)

*

g (q’) (k)

  • e

(k’)

+

e N' (p') N (p) g* (q)

g

(q') e (k) e (k')

hard soft

x+ x x- x t

  • +

N' (p') N (p) g* (q)

g

(q') e (k) e (k')

hard soft

x+x x-x t

  • +

TCS BH 11 GeV Kinematic Coverage DVCS TCS DVCS TCS

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SLIDE 11

NPS

  • Equipment will be ready for beam before 2022
  • Rich physics program
  • Join us!
  • https://wiki.jlab.org/cuawiki/index.php/Main_Page
  • Tanja Horn, coordinator

January 28, 2019 NPS C. Hyde 11

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SLIDE 12
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SLIDE 13

Magnet Mapper

  • ODU graduate student Mitch Kerver at the controls
  • Hall Probe recording now added

January 28, 2019 NPS C. Hyde 13