Kurt. J. Lesker Company offers the PA35-H adjustable bellows with adjustability of +/-5mm axially and +/-3 degrees at a price of $1,423 . Due to the budget constraints and problem statement of simply getting a spectrum, a cheaper alternative is desirable . Through a finite element analysis, it has been determined that compressing a CF flange copper gasket using asymmetrical torque of clamping hardware will allow the primary ion impact location sufficient adjustability to meet the 50-micrometer alignment tolerance. A cross section of the CF flange can be seen in Fig. 21. Figure 21: Cross section of a CF flange with copper gasket that is deformed to create a seal
APPENDICES Table 3: Customer Needs (CN) & Engineering Requirements Customer Requirements Weight (1-10) Engineering Requirements Tolerance (+/-) (value) Testing Procedure Design Links Correlation to CN (1-5) Absolute Technical Importance (values) Relative Technical Importance Calc. Weight Weight Compact 9 Spherical chamber with diameter of about 6 inches 0.5 in. Measuring Diameter Limiting the volume of the volume of the F2:F19chamber will reduce the amount of time it takes to pump 4 36 4 0.09 0.06 Quick Preparation 4 Pumping to 10^-6 torr takes less than 30 days 7 days Timing the process Shortening the time it takes to pump will increase efficiency 5 20 10 0.04 0.09 Vapor Removal System 4 Chamber can withstand at least 300°c 50°C Measuring temperature and inspecting chamber Will assure that the chamber is not compromised at high temps. 4 16 11 0.04 0.05 Alignment for Material 7 Effective means of z-axis translation Seeing effectiveness and ease to use Will allow the spot areas to be aligned 4 28 9 0.07 0.05 Multiple Samples Usable 2 Effective means of x-y plane translation Seeing effectiveness and ease to use Will allow us to change materials without having to the vacuum 3 6 16 0.02 0.01 Securing Material 7 Reliable and easy to use securing apparatus Material does not come loose and is easy to use Will assure that the sample does not move 5 30 7 0.06 0.05 Ability to Add Future Accessories 3 At least 4 ports 1 port Counting Will allow use of other mechanisms in the UHV chamber 4 20 12 0.05 0.04 Easy to Add Accessories 2 Mounting ports compatible with variety of accessories Attach and Remove accessories Will ensure instruments are not likely to be damaged during installation 4 8 15 0.02 0.04 Precise and Accurate 7 Ability to target w/in tolerance 20 µm Measuring spot size Will assure that we are collecting protons of the material 5 35 5 0.07 0.1 Safe to Use 10 Shielding for all apparatuses Measure Radiation Needed to ensure no one is exposed radiation is not 4 40 3 0.10 0.09
Table 2: Customer Needs (CN) & Engineering Requirements Continued… Customer Requirements Weight (1-10) Engineering requirements Tolerance (+/-) (value) Testing Procedure Design Links Correlation to CN (1- 5) Absolute Technical Importance (values) Relative Technical Importance Calc. Weight Weight Moveable by Personnel 2 Under 80 lbs. 15 lbs. Weigh on industrial scale Irrelevant to use but more practical for installation 4 8 14 0.02 0.02 System Grounding 8 Securing the chamber and base to workbench Testing to see that the system is firmly mounted A system that is not stable can introduce unexpected failures 4 32 6 0.08 0.06 Focusing of Atoms 7 The ability to focus atoms into the TOF Measuring quantity of atoms collected in the TOF Focusing atoms into TOF will give us a better reading on the material 5 30 8 0.06 0.07 Proof of Functionality 10 Show that we are getting atoms to the entrance of the TOF Checking the Phosphorus sheet for proof of receiving atoms Proof that we are receiving atoms @ end TOF shows that our system is successful even if data is not precise 5 50 1 0.10 0.1 Price 10 Manufacturing a chamber for under $3000 $3,000 Calculating the cost of the Chamber We have a certain budget that we cannot exceed 5 50 2 0.10 0.09 Viewport or Camera 5 Able to look though viewport without eyewear Observe after use if any energy or material can be harmful Will allow for observation at the surface of the material 2 10 13 0.05 0.03 Innovative 2 Innovative design for sample plate Does it simplify or overcomplicate May make the system easier to use or more efficient 3 6 17 0.02 0.03 1 Innovative design for vacuum entry Does it simplify or overcomplicate May make the system easier to use or more efficient 3 3 18 0.01 0.02 Absolute Technical Importance 430