ALS EXPERIMENT FORM
[Please print or type]

EXPERIMENT: 

Experiment/Proposal Number:	ALS-04948	
Title of Experiment:	Core-shell Photoionization and subsequent Auger decay of simple non-planar Molecules	
Beamline/Branchline/End Station:	11.0.1	
Expected start date of experiment:	Day: 12                  Month: 3                     Year: 2012	
Date of completion:	1/20/2012	
Person completing this form:	Thorsten Weber	

EXPERIMENTER IN CHARGE:

Name:	Thorsten Weber	Signature: 	
Affiliation:	Lawrence Berkeley National Laboratory	
Address:	1 Cyclotron Road, Berkeley, CA-94720, USA	
Phone:	1 510 486 5588	
Local Address:	2-118	E-mail address: TWeber@lbl.gov 	
Local Phone:	x5588	Fax No.: 1 510 486 5494	

BRIEF DESCRIPTION OF EXPERIMENT (purpose, apparatus):
Measuring the 3d momentum vectors of up to 4 particles in the double Auger decay of non-planar molecules with the COLTRIMS method.
 
SAMPLE ONLY EXPERIMENT: Yes      No   X 
Are you bring any equipment with you?   Yes  X    No 
“No” (complete pages 1, 2, and 4)
“Yes” (complete entire form)

BEAMLINE MODIFICATION: 
Is modification to an existing beamline necessary? Yes    No  X 

SCHEMATIC DIAGRAM OF EXPERIMENTAL APPARATUS 
If you are bringing your own equipment or endstation, please fax a schematic of your experiment setup to the User Office at (510) 486-4773. The schematic can be hand drawn (see example on page 11 for level of detail necessary). It should include the following: 
•	vacuum chambers
•	gas delivery systems 
•	vacuum pumps and valves
•	high-voltage feed-throughs and internal high-voltage connections 
•	vacuum viewports
•	pressure or vacuum gauges
•	water, gas, or cryogenic cooling circuits 
•	up-to-air or venting arrangements
•	movable rotating parts 
•	gas cells and their thin windows or differential pumping arrangements
•	other important features in terms of safety and vacuum integrity 
•	experiment/proposal number noted on schematic 

ALS EXPERIMENT FORM 

Please provide the following information for all EXPERIMENTERS: 

Name	Affiliation	Email	Local Phone	
Thorsten
Weber	LBNL	TWeber@lbl.gov 	x5588	
Bishwanath
Gaire	LBNL	BGaire@lbl.gov 	x4847	
Irina 
Bocharova	LBNL	IABocharova@lbl.gov 	x4803	
Nele
Gehrken	LBNL	NMGehrken@lbl.gov 	X7838	
Felix 
Sturm	LBNL	FPSturm@lbl.gov 	x4803	
Till
Jahnke	University of Frankfurt	Jahnke@atom.uni-frankfurt.de 	guest	
Helena
Gassert	University of Frankfurt	Gassert@atom.uni-frankfurt.de 	guest	
Stefan
Zeller	University of Frankfurt	Zeller@atom.uni-frankfurt.de 	guest	
Joerg
Voigtsberger	University of Frankfurt	Voigtsberger@atom.uni-frankfurt.de 	guest	
Allen
Landers	Auburn University	landers@physics.auburn.edu 	guest	
Joshua 
Williams	Auburn University	joshua.brown.williams@gmail.com 	guest	
Averell
Gatton	Auburn University	asg0009@tigermail.auburn.edu 	guest	
Dylan
Reedy	Auburn University	DPR0008@auburn.edu 	guest	
Cory 
Nook	Auburn University	CSN0003@auburn.edu 	guest	

ALS EXPERIMENT FORM 

SAFETY CHECKLIST 
Please review the section headings below and place a check mark beside each category which applies to your experiment equipment and/or materials. 

Note: All experiment equipment brought to the ALS must comply with ALS and Berkeley Lab safety requirements before it will be allowed to operate at the ALS. These requirements are detailed in the documents found in the “Essential Information” section of each of the following pages.

•	Materials
•	Class 3b and 4 Lasers
•	Power Supplies and Other Potential Electrical Hazards: High Voltage (>50V and >5mA), RF, and Microwave
•	Vacuum Chambers
•	Gas Systems
•	Radioactive Materials, X-Rays, and Hutches
•	Other Hazards, including: 
- Sources of Significant Noise, Vibration, or Radio Frequency Interference 
- High Temperature Components (other than heater tapes used for bake-outs) 
- Rotating or Motorized Equipment 

Seismic Requirement 
Most experiment equipment installed at the ALS must be restrained (usually by bolting to the floor) to resist earthquake forces. For information on bolting and safety requirements, see ALS User Advisory 4*: Guidelines for Meeting Seismic Requirements for User Equipment at the ALS 

*Advisories are available on the web at http://www-als.lbl.gov/als/user-advis/user_advis_index.html  

ALS EXPERIMENT FORM 

MATERIALS 
•	Only small quantities of hazardous substances are allowed on the ALS experiment floor and all hazardous materials must be in approved containers. In addition, only limited storage space for hazardous materials is available; please bring the smallest quantity possible. 

•	Shipment and transfer of hazardous materials will be via approved carriers only. Transportation of hazardous materials by personal or Lab vehicle is prohibited. 

ESSENTIAL INFORMATION: 
ALS User Advisory 11: ALS Chemistry Laboratory — Facilities and Safety Requirements ALS User Advisory 15: The Use of Toxic and Corrosive Gases at ALS Endstations 

ADDITIONAL REFERENCES : 
PUB 3000, Chapter 20: Hazardous Waste Disposal
PUB 3000, Chapter 21: Radiation Safety

ACTION: List all materials planned for use in this experiment. Include samples (targets), chemical solvents, and biological materials. 

Materials	Amount	Solid, Liquid, or Gas	
Acetone	400ml	liquid	
Methanol	400ml	liquid	
Ethanol	400ml	liquid	
Isopropanol	400ml	liquid	
NH3	1 cylinder	gas	
C2H4	1 cylinder	gas	
C4H6	1 cylinder	gas	
N2	1 cylinder	gas	
He	1 cylinder	gas	

			

ALS EXPERIMENT FORM 

LASERS: CLASS 3B AND CLASS 4 
•	LBNL laser safety training and eye examinations will be required for personnel using class 3b and class 4 lasers (documentation must be provided). If you have had a laser eye exam in the past year, it may satisfy LBNL medical surveillance requirements; use the Non-LBNL Eye Exam Form, available in the User Services Office, for evaluation of your exam. 

•	Special safety requirements, depending on the class of the laser and whether the radiation is visible or invisible, are described in Chapter 16 of PUB 3000 (see below). 

ESSENTIAL INFORMATION: 
ALS User Advisory 6: Laser Safety Policies for Class 3b and Class 4 Lasers 
PUB 3000, Chapter 16: Lasers 

ACTION: List laser(s) to be used in this experiment. 

Type	Power	Pulsed/CW	Class	Brand/Model	

					

ALS EXPERIMENT FORM

POWER SUPPLIES AND OTHER ELECTRICAL HAZARDS:
HIGH VOLTAGE (>50V AND >5MA), RF, AND MICROWAVE POWER
SUPPLIES

•	High-voltage power supplies can pose obvious hazards to personnel and sensitive equipment. In some cases (i.e. microwave, RF, high-voltage power supplies), radiation in the form of x-rays may be produced. To avoid hazardous conditions, current should be limited to low values whenever possible. 

•	To conform to Berkeley Lab’s stringent electrical safety requirements, special enclosures, signs, warning devices and/or interlocks may be required, along with training and Activity Hazard Documents (AHDs). LBNL electrical safety rules are discussed in Chapter 8 of PUB-3000. 

•	Electrical systems within a vacuum chamber, particularly those that include the use of high voltage (>50V) power supplies (or equivalent in batteries) or any floating power sources, may require a more detailed safety inspection. Be prepared to provide a simple wiring diagram of these systems at the time of your experiment safety review. 

ESSENTIAL INFORMATION: 

ALS User Advisory 3: Avoiding Overloads on AC Circuits
ALS User Advisory 5: Beamline Electrical Safety Guidelines
PUB 3000, Chapter 8: Electrical Safety

ACTION: List power supplies and electrical equipment to be used in this experiment. 

Type of Supply/Manufacturer Model	Maximum Voltage	Maximum Current	
ISEG	4kV	0.3A	
PowerTen	30V	300A	
Tenma	30V	3A	
SRS	5kV	0.1A	

ALS EXPERIMENT FORM 

VACUUM CHAMBERS 
•	The integrity of experiment endstations brought to the ALS is a concern because their vacuum chambers usually communicate directly with the ALS storage ring. Endstations must operate under UHV conditions or be isolated from the beamline to avoid contamination of the beamline and/or storage ring. Commercially designed and fabricated stainless steel vacuum chambers are generally acceptable for use at the ALS. A Residual Gas Analysis (RGA) test of user equipment to assess vacuum quality may be required before opening the chamber to a beamline. Please contact the user vacuum support staff prior to attaching to a beamline. 

•	The use of oil-sealed or oil-lubricated vacuum pumps is highly discouraged at the ALS due to the risk of contamination. In some cases, however, the need for very high pumping speed and/or resistance to corrosive gases may dictate the use of an oil-sealed pump. In these cases, a rigorous safety interlock system must be in place to prevent oil contamination of the beamline and storage ring. For more information, see ALS User Advisory 14. 

•	Breakage of glass vacuum viewports is a significant hazard. Commercial viewports with apertures of 15 cm (6 in.) or less are acceptable, and may be provided with transparent protective covers by the ALS. Larger, or custom-made viewports must be documented and pressure tested. 

NOTE : 
•	Only unbreakable “nude” ion gauge heads are allowed at the ALS. Glass-tube ion gauges are not allowed. 
•	Gas delivery systems must include a positive means to prevent inadvertent over-pressurization of the vacuum chamber. 
•	Cooling water to vacuum joints is not allowed. 

ESSENTIAL INFORMATION: 
ALS User Advisory 9: Vacuum Policy for User Endstations for Protection of Beamline Components 
ALS User Advisory 14: Interlock Requirements for Turbo Pump Systems on ALS Endstations 
ALS User Advisory 15: The Use of Toxic and Corrosive Gases at ALS Endstations 

ADDITIONAL REFERENCES : 
Advanced Light Source Vacuum Policy and Vacuum Guidelines for Beamlines and Experiment Endstations 
PUB 3000, Chapter 7: Pressure Safety and Cryogenics 

ACTION: List all vacuum chambers, approximate volumes, and working vacuum pressures, and answer the following questions. 

Chambers	Approximate Volume	Fabrication Source	Working Vacuum 
Pressure	
Experimental Chamber	60l	Roentdek	1E-7mbar	
Gas jet Source	15l	Roentdek	1E-4mbar	
Differential Stage	10l	LBNL	1E-9mbar	

Are there any viewports which are not standard catalog items of aperture 15 cm or less? Yes    No   X 
Will any part of the system ever experience pressures greater than 3 psi above atmospheric? Yes   No  X 
Will oil-sealed or oil-lubricated vacuum pumps be used? Yes    No   X 

ALS EXPERIMENT FORM 

GAS SYSTEMS 
•	Gases at low pressures are used in ALS endstations for a variety of purposes, and are usually segregated from the beamline by a thin window or a differential pumping section. Contamination of the beamline and storage ring is a concern, as well as inadvertent pressurization of the experiment chamber and its viewports. 

ESSENTIAL INFORMATION: 

ALS User Advisory 9: Vacuum Policy for User Endstations for Protection of Beamline Components 
ALS User Advisory 15: The Use of Toxic and Corrosive Gases at ALS Endstations 

ACTION: List the specifications of the gas system. 

- Gases to be used and their intended maximum pressures: 

N2 – 150psi, NH3 – 15psi, C2H6 – 15psi, C2H4 – 100psi, He – 400psi

- Pressure limiting provisions, such as a relief valve, limited source volume, or interlock system: 

Pressure relief valve on supersonic gas jet source chamber + during operation the lid of the main chamber will not be bolted down functioning as an additional pressure relief.

- Thin window material, aperture, and thickness: 

- Thin window test differential pressure or safety factor: 

- Differential pumping capacity and pressure ratio: 

The single stage differential pumping stage is able to create a pressure ratio of 1:300. The pressure in the differential pumping stage is 1E-9mbar while the pressure in the chamber is 1E-7mbar. The differential chamber is pumped with a 250l/s turbo pump backed by an Alcatel Drytel forepump.

ALS EXPERIMENT FORM 

RADIOACTIVE MATERIALS, X-RAYS, AND HUTCHES (RADIATION HAZARDS) 

•	The use of radioactive materials, radiation producing equipment (x-ray machines, some high-voltage power supplies, etc.) or vacuum windows may require special procedures, training, handling and storage facilities. 

ESSENTIAL INFORMATION: 

ALS User Advisory 16: The Use of Radioactive Materials at the ALS
PUB 3000, Chapter 21: Radiation Safety

ACTION: Answer the questions below regarding the use of x-ray producing equipment, vacuum windows, hutches, and radioactive material. 

List x-ray producing equipment: 

Will the beam be delivered out through a window? Yes    No  X 
If a hutch will be used, will it need modification? Yes     No    X 

Will radioactive materials be used? Yes    No  X 

If yes, answer these questions [a Radiological Work Authorization (RWA) may be required]: 

1.	What is the isotope and the level of the daughter radiations? 

2.	Are there any impurities present? Yes No If yes, please describe. 

3.	How much in (milli, micro, or nano) curies and grams? 

4.	How is the sample prepared before mounting? 

5.	How is the sample mounted? 

6.	How has the sample been tested and certified for integrity and radiation levels? 

7.	How is the sample prepared in vacuum (e.g., sputtering, annealing, cleaving)? 

8.	Which endstation and beamline are you going to use and why? 

9.	Are you going to add anything to the endstation? Yes No If yes, please provide a picture/ sketch and description of how it will work, and indicate places where material could be lost. 

10.	What is the response to loss of sample or vacuum during the experiment? 

ALS EXPERIMENT FORM 

OTHER HAZARDS 

Many kinds of hazards exist in addition to those listed in other sections, e.g.: 
•	High magnetic fields 
•	Corrosives 
•	Explosives 
•	Environmental contaminants (i.e., discharge to air, soil, water, or waste streams) 
•	Sources of significant noise, vibration, or radio frequency interference 
•	High temperature components (other than heater tapes used for bake-outs) 
•	Rotating or motorized equipment 

ACTION: List and describe all potential hazards not mentioned in the preceding sections of this form by describing the source of hazard and description of the process. 

Source of Hazard	Description of Process	
magnetic field	We will use a set of Helmholtz Coils to create an external magnetic field 
of up to 20 Gauss	
cold traps	We have two cold traps which will be filled manually with liquid nitrogen	

		

		

ALS EXPERIMENT FORM 

SCHEMATIC DIAGRAM OF EXPERIMENTAL APPARATUS: 

Example shows level of detail necessary. 

ALS EXPERIMENT FORM 

SCHEMATIC DIAGRAM OF EXPERIMENTAL APPARATUS: 

Experimental Setup of the COLTRIMS Experiment

In the COLTRIMS set-up the photon beam is intersected with an internally cold and well-localized two-stage supersonic gas jet. The electrons and ions are guided by electric and magnetic fields towards position sensitive detectors, capable of handling multiple hits from each event. The fields are chosen such that a solid detection angle of 4pi is achieved for the electrons and ions. In some cases resolution is preferred over solid detection angle and the fields are lowered. 
In the end, for each particle, the momentum vector can be deduced from the measured time of flight and the two dimensional position of impact on the detector. All information is recorded in list-mode, which allows for the replaying of the experiment after the actual beamtime many times offline as well as the transformation of the multidimensional momentum space to any desired coordinate frame most appropriate for the physical process under investigation. 
Since the emission of the electrons is prompt, their angular distribution with respect to the axis of the target molecule is determined before the breakup occurs. The final state momentum vectors of the two repelling ions, which will be measured as well, then indicate the orientation of the molecular axis after the fragmentation.

The on hand setup (see sketch below) consists of a high vacuum chamber, which houses a combined electron and recoil ion momentum spectrometer. The Time-Of-Flight (TOF) and the position of impact of the two electrons and recoil ions will be measured with Multi Channel Plate (MCP) detectors at the ends of our spectrometer. 

Figure 1: Sketch of the set-up of a COLTRIMS experiment with a two stage gas phase target (supersonic jet) and a differential pumping stage in front as well as a photon beam dump at the end. The gas jet is dumped in a separate vacuum chamber interconnected by a small tube in order to prevent back scattering from the turbo pump. The momentum spectrometer is in the center of the setup. The big circle represents the pair of Helmholtz coils which establishes the magnetic field guiding the electrons onto their detector.

The COLTRIMS endstation has been approved already at the ALS at earlier experiments at BL 9.3.2 and 7.3.1 and 4.0.2, and 11.0.2 as well as 10.0.1.

More safety information can be found here: 
http://amo-csd.lbl.gov/downloads/IHAD_COLTRIMS.pdf 
http://amo-csd.lbl.gov/downloads/Upload%20Files.zip