# Presentation: 202741

## HYSPEC: A Crystal TOF Hybrid Spectrometer

- S. M. Shapiro
- HYSPEC IDT Meeting
- September 10, 2004
- CLO Building-SNS- Oak Ridge
- _http://__neutrons__.__phy__.__bnl__.__gov__/CNS/__hyspec__/__documents__/HYSPEC___DOEproposal__.__pdf_

## Purpose of Meeting

- Inform IDT Members of Progress in design
- Cost estimates
- Schedule
- Will HYSPEC satisfy your scientific needs?
- New scientific opportunities
- Provide Information for Options
- Inside or outside of building?
- Type of ancillary equipment?
- Magnets
- Progress at SNS

## Instrument Development Team (IDT)

- _I. Zaliznyak_, co-PI	BNL			HYPSEC INSTRUMENT
- _S. M. Shapiro_, co-PI	BNL			DESIGN WORKING GROUP
- G. Shirane		BNL
- J. Tranquada		BNL			I. Zaliznyak (BNL)
- L. Passell		BNL			S. Shapiro	(BNL)
- D. Abernathy		SNS			L. Passell (BNL)
- L. Daemen		Los Alamos			V. Ghosh (BNL)
- M. Greven		Stanford				(Monte Carlo Simulations)
- B. Gaulin		McMaster			B. Leonhardt (BNL/SNS
- K. Hirota		ISSP				(Engineering Design)
- V. Kiryukhin		Rutgers			M. Hagan (SNS) (Instrument Scientist)
- G. Lander		EITU
- Y. Lee		MIT
- C.Majkrzak		NIST
- S. Nagler		ORNL
- R. Osborn		ANL
- L. P. Regnault	CEN-Grenoble
- J. Rhyne		LANL
- R. McQueeney	Ames/Iowa St.
- A. Zheludev		ORNL

## Science Case

- Strongly correlated electron systems
- Hi-Tc: YBCO experiment at ILL-IN22
- Low-D magnetism
- Quantum critical points
- Nanomagnetism and complex systems
- Disordered and weakly order phases
- Anomalous phonon behavior

## Polarized Neutron Study of Resonant Mode in YBCO6.85 (L.P. Regnault et al.)

- IN22
- Spin Flip
- P // Q

- Rise due to increased counting time

** ****Much faster data collection**
** ****Open new areas for polarized beam use**

- Sharp IC

- Broad C

- Unpolarized

## SNS Inelastic Neutron Scattering Workshop1 Argonne (11/99)

-  A and B category top priority - **“potential day-one instrument”**
- 1 Report on the SNS Inelastic Neutron Scattering Workshop, SNS Document IS-1.1.8.2-8004-MM-A-00 (2000).

- BS
- SEQUOIA
- CNCS
- ARCS

- HYSPEC

## Motivation for HYSPECSNS Workshop (11/99)

- Small single crystal samples
- Focusing Bragg optics
- Broad range of standard sample environments
- Use of collimators and beam definers
- Sample environment separate from detector vacuum
- Low background
- Time of flight
- Sample out of direct beam
- Use of collimators
- Vector **Q** in single crystals
- Moveable detector and rotatable sample
- Polarization analysis
- Proven and maintenance-free technology

## History

- Fall, 1999
- BNL initiates an effort to design a spectrometer for the SNS
- December, 2000
- Concept of the Hybrid Spectrometer formulated and adopted
- March, 2001
- First presented to EFAC. Received positive reply
- Fall, 2001
- Instrument Development Team formed
- October: Workshop on the Hybrid Spectrometer held at BNL
- Refined HYSPEC concept presented to EFAC
- January, 2002
- HYSPEC IDT filed Letter of Intent with SNS
- April, 2002
- Formal presentation to EFAC
- July, 2002
- Letter of Intent accepted;
- December 2002
-  Submit Proposal to DOE, accepted in 2003

## HYSPEC Components 

- T0 Chopper
- Disc Chopper
- Monochromator
- Goniometer
- Radial Collimator,
- or Bender Polarizers
- Flight Chamber (evacuated or Ar/He filled)
- Detectors

## Layout on Experimental Floor

**Layout on Experimental Floor**

- Coupled H2
- Moderator
- BL 14B

## Comparison with other inelastic instruments planned for the SNS

-  MC simulations by MCSTAS, V. Ghosh (2002)
-  CNCS, ARCS and HRCS (SEQUOIA) intensities are re-scaled to HYSPEC energy resolution
- See Ganroth and Abernathy (ICANS XVI)

## SNS User Policy

- Set by DOE for _all_ user facilities
- 20% for IDT
- 5% for Instrument Scientists
- 75% for facility reviewed proposal
- IDT can apply for facility time

## HYSPEC place in the SNS inelastic instrument suite

|  | HYSPEC | CNCS | ARCS | HRCS |
| --- | --- | --- | --- | --- |
| Incident energy range | 5 – 90 meV | 2 – 20(50?) meV  | 10 – 1000 meV | 15 – 1000 meV |
| Maximum flux on sample | 1.1 x 107 
at 15 meV | 5.6 x 106
at 5 meV | 7.8 x 105
at 100 meV | 9.6 x 105
at 100 meV |
| Energy resolution E/E | 0.017 – 0.15 | 0.01 – 0.1 | 0.02 – 0.05 | 0.015 – 0.05 |
| Polarized beam | Yes | No | No | No |
| Intended sample size | 4 (w) x2 (h) cm2 | 1.5 (w) x5 (h) cm2 | 5 (w) x7.5 (h) cm2 | 5 (w) x7.5 (h) cm2 |
| Moderator-sample dist. | 21.8m | 36.2m | 13.6m | 17.5m |
| Sample-detector dist. | 4.5 m | 3.5 m | 2.5 m | 6.0 m |
| Angular acceptance | 0.27 – 0.41 sR |  | 3.1 sR | 1.2 sR |
| Beamline # | 14B  | 5 | 18 | 17 |
| Guide coating | m = 3 | m = 3.5 | m = 3 – 3.5 | m = 3 – 3.5 |
| Guide Apertures 
(width x height, cm2) | entrance 4x12.8
main 4 x 15 
exit 4 x 10 | entrance 5 x 10
main 5 x10 
exit 1.5 x 5 |  |  |