NEH 1.1 beamline will have two separate instruments with the fixed X-ray beam positions – NAMASTE and DREAM. Some baemline components and diagnostics will be placed in the front end enclosure (FEE) as shown in the functional layout below. In the hutch the NAMASTE endstation will be situated upstream, while the DREAM endstation will be located downstream.  Each endstation will have a separate set of KB focusing optics, together with the individual suite of post-interaction region diagnostics.

The NEH 1.1. NAMASTE endstation will offer the possibility to install modular stations (roll in and out) which can be set up, aligned and commissioned outside the hutch and installed at the first TMO focus spot. Therefore, these modules have to be highly standardized and will accept gas phase and solid samples.  

DREAM instrument will be designed while keeping in mind a more stringent requirements of a COLTRIMS type coincidence experiments – UHV of 10-11 – 10-12 Torr pressure, thin gas jet (<1010 per cc) or solid target, sub-micron X-ray focus. While DREAM will be made compatible with several types of spectrometer the system will be considered much less flexible than NAMASTE when it comes to the configuration changes and will require longer time between experiment setup alterations. Typical dynamic molecular reaction microscope spectrometer of DREAM station will be capable of taking full advantage of the LCLS II high rep rate. 

Both endstations as well as their diagnostics will have flexible 6 Degree of Freedom (6-DoF) stands. Timing tools will be provided for optical-pump / X-ray probe experiments in either chamber.  Also part of the diagnostic are WFS and Power Meter.

The following figures present functional and physical layouts of the NEH 1.1 beamline, TXI beamline components are minimally shown to emphasize the space interplay between NEH 1.1 and 1.2.

NEH 1.1 Optical Layout

Overview of the TMO mirror layout.
Overview of the TMO mirror layout. Top part shows the distances from theundulator in meter. Also shown the flat mirror and both KBO system as well as theIPs. The bottom left part shows the dashed line section of the top part with themirror orientations and gracing incidences as top and side view. The right hand partshows the beam line transmission after IP1 and IP2, with an average transmissionof 80% for IP1 and 60% for IP2 respectively.

NEH 1.1 Schematic Layout


NEH 1.1 Schematic Layout
Schematic overview of the TMO instrument layout with distances. All distancesare indicated in meters from the first mirror inside of TMO. Shown are scatterSlits (S), Diagnostics (D), KB Optics (KBO), Laser IN-coupling (L-IN), InteractionPoints (IP), Laser OUT-coupling (L-OUT) and laser Arrival Time Monitor (ATM).


NEH 1.1 Functional Layout

Download high-res PDF drawing of the functional layout

NEH 1.1 Physical Layout

TMO Components
Overview of the TMO instrument layout. Showing both endstations which arecapable to take full advantage of both the high per pulse energy from the copperaccelerator (120 Hz) as well as high average intensity and high repetition rate fromthe superconducting accelerator (1MHz). Indicated are the beam position monitorsIM3K4, IM4K4, IM5K4, IM6K4; differential pumping sections PA1K4 and PA2K4;IP1 optical Laser in-coupling LI1K4, LI2K4 and IP1 Laser out-coupling LI3K4; thearrival time monitors TM1K4 and TM2K4; wave front sensor PF1K4 and PF2K4;retractable beam terminators SF1K4 and SF2K4; beamline collimators PC5K4; aswell as the interaction points IP1 and IP2; and finally the beam terminator SF3K4.