Photon Calibrator DRR & CDR: Response so that Reviewers? Report Phil Willem

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Photon Calibrator DRR & CDR: Response so that Reviewers? Report Phil Willem

Campbellsville College, US has reference to this Academic Journal, Photon Calibrator DRR & CDR: Response so that Reviewers? Report Phil Willems, Mike Smith Conceptual Design Reviewers? comment: ?Given our experience alongside the iLIGO photon calibrators, we don’t think it is worthwhile so that do any significant re-design in consideration of AdL; we should just plan on using the iLIGO calibrators, probably alongside a few upgrades.? Agreed. The main difference between initial in addition to Advanced LIGO Photon Calibrators is in the preliminary qualifications used so that guarantee the accuracy of the calibration; the actual design in addition to operation will be very similar. Reviewers? comment: ?Presumably the lasers will need so that be replaced in consideration of AdL, but we don’t find much motivation so that go so that a higher power (2W) version. Since some time has been spent in working out the kinks alongside the 0.5 W lasers, let’s stick alongside them.? Agreed. Given the recommended calibration line SNR requirement a «W laser is more than sufficient.

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Reviewers? comment: ?For a list of potential upgrades so that the current hardware, proposed by the folks who have been working alongside them, see: ligo.caltech /docs/T/T070094-00.pdf? These potential upgrades are in consideration of the most part incorporated into the CDD, although in much less detail. Reviewers? comment: ?Is there really any evidence that the coating absorption could be 100ppm at 1047 nm? This seems rather unrealistic so that us, unless there is evidence we don’t know about.? There is no evidence in consideration of this, in addition to it does seem unrealistic, but the possibility was raised as an explanation in consideration of the discrepancy between photon calibration in addition to official calibration in addition to was difficult so that test in situ. It seems prudent so that require a measurement in consideration of Advanced LIGO in addition to lay this so that rest. Reviewers? comment: ?Active amplitude stabilization of the Pcal laser can be deleted.? So long as the displacement induced by the photon calibrator off its calibration frequency is less than AdLIGO sensitivity, we agree. This appears so that be true based upon the revised requirement recommended in consideration of the DRD.

Reviewers? comment: ?Chopper wheel. We understand this is used so that measure the frequency response of the photodetector. Why does this have so that be included in each Pcal’s bench? Why not instead calibrate the freq resp of each PD on the bench before installation?? Probably it is not essential, but reflects a philosophy of allowing as much recalibration as possible after installation without having so that dismantle the calibrator. Reviewers? comment: ?4.3 mentions correcting nonlinearity of the AOM response in the drive signal. Why do you want so that do this? As long as the fast PD is measuring the modulation, why do we care how linear the drive is?? A very good point. Our desire was so that guarantee that the test mass motion was as sinusoidal as possible. This is probably not necessary. Reviewers? comment: ?We’d like so that know what the plan is in consideration of viewport use at the LHO end stations, where there are 2 ETMs. We’d like so that see a drawing that shows the viewport assignments in consideration of all uses: photon cal beams; optical lever beams; cameras; Hartman sensor beams (?); . Also indicate any in-vacuum baffling that could restrict the views.? This is currently a weekly topic during the AOS telecons. The precise nature of the vacuum in addition to facility modifications in the LHO end stations is not yet determined. Our most current baseline is shown, in addition to incorporates our need in consideration of optical access.

Management Control Systems, Transfer Pricing, in addition to Multinational Considerations Chapter 22 Learning Objective 1 Describe a management control system in addition to its three key properties. Management Control Systems Management Control Systems Evaluating Management Control Systems Learning Objective 2 Describe the benefits in addition to costs of decentralization. Organization Structure Benefits of Decentralization Costs of Decentralization Decentralization in Multinational Companies Responsibility Centers Learning Objective 3 Explain transfer prices in addition to four criteria used so that evaluate them. Transfer Pricing Transfer Pricing Learning Objective 4 Calculate transfer prices using three different methods. Transfer-Pricing Methods Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Transfer-Pricing Methods Example Learning Objective 5 Illustrate how market-based transfer prices promote goal congruence in perfectly competitive markets. Market-Based Transfer Prices Market-Based Transfer Prices Market-Based Transfer Prices Learning Objective 6 Avoid making suboptimal decisions when transfer prices are based on full cost plus a markup. Cost-Based Transfer Prices Example Cost-Based Transfer Prices Example Cost-Based Transfer Prices Example Cost-Based Transfer Prices Example Cost-Based Transfer Prices Example Cost-Based Transfer Prices Example Cost-Based Transfer Prices Example Learning Objective 7 Understand the range over which two divisions negotiate the transfer price when there is unused capacity. Prorating Prorating Prorating Dual Pricing Negotiated Transfer Prices Learning Objective 8 Construct a general guideline in consideration of determining a minimum transfer price. Comparison of Methods Comparison of Methods Comparison of Methods Comparison of Methods Comparison of Methods General Guideline General Guideline General Guideline General Guideline Learning Objective 9 Incorporate income tax considerations in multinational transfer pricing. Multinational Transfer Pricing End of Chapter 22

Design Requirements Document Photon Calibrator force noise requirement The PC applies force so that the test mass, in addition to noise in the noise will cause displacement noise in the IFO. Thus a force noise requirement should be set. It is reasonable so that require that the PC force noise satisfy similar requirements as SUS actuator technical noise, since it is like an actuator. The review committee suggests a requirement that the PC noise be negligible compared so that the lowest possible IFO noise. Such a standard would not be very specific. Photon Calibrator force requirement Reviewers? comment: ?The requirement here should be expressed as a minimum calibration line SNR, given the expected detector noise curve, in consideration of a given integration time in addition to up so that a maximum frequency. We suggest the following set: SNR = 10, Integration time: 1 sec, Max frequency: 500 Hz.? We can in addition to have expressed the requirement in this way; however, the relation of this so that modulated light power is then obscure in addition to needs clarification, which we have also added. In practice the maximum modulated light power is not frequency dependent, so will be set by a single worst case frequency. Will the maximum frequency be 500 Hz? Is there a lower limit frequency? Should we build a margin, e.g. in consideration of operation above design sensitivity before complete commissioning or in consideration of narrowband operation? From the DRD: ?The displacement of the HR surface of the ETM caused by the Photon Calibrator shall be absolutely known so that within 1%.? Reviewers? comment: ?This is way too much so that ask, in addition to given our iLIGO experience, it seems dubious that this will ever be achievable. We suggest making it 5% or best effort (~10%), which is good enough in consideration of a check on the primary calibration.? We feel that the iLIGO experience has shown that more attention needs so that be directed toward calibration in addition to characterization of the PC before installation. Absolute radiometric calibration has not been attempted. Mirror in addition to viewport reflectivities in addition to absorptions were not adequately characterized before installation. There is no thermal control. Such techniques are relatively inexpensive in addition to simple in addition to should be used if they offer improved accuracy at the percent level.

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