1. P. Karchin – PMTs for Scintillator Based Muon Systempage 11/7/2004 January 7, 2004 American Linear Collider Physics Group 2004 Workshop Stanford Linear Accelerator Center Multi-Anode Photomultiplier Tube Tests, Calibration and Front-End Scintillator Based Muon System R&D for a Linear Collider Paul Karchin Wayne State University Department of Physics and Astronomy Personnel: Paul Karchin, Physicist Alfredo Gutierrez, Research Engineer Marcel Leonard, Undergraduate Physics Student (Fall 2003) Rajesh Medipalli, Physics Graduate Student (Summer 2003)

2. P. Karchin – PMTs for Scintillator Based Muon Systempage 21/7/2004 Motivation economy of MAPMT's makes possible the large channel count needed for a fine-grained scintillator detector <1000 channel readout needed for a prototype system develop expertise to specify a larger system General Considerations 1 pC charge = gain of ~ 6 x 10 6 1 pC in a 5 ns pulse into a 50 ohm load = 10 mV amplitude advanced testing and characterization of M-16 and M-64 phototubes by MINOS collaboration, HERA-B RICH, CDF calorimeter

3. P. Karchin – PMTs for Scintillator Based Muon Systempage 31/7/2004 Stability and In-Situ Calibration of a Large Scale System ● Stability aging: scintillator, wavelength shifter, light guide radiation damage from accelerator sources ? pmt and electronics ● Calibration cosmic rays light emitting diode radioactive source

4. P. Karchin – PMTs for Scintillator Based Muon Systempage 41/7/2004 Charge calibration system for pmt anode pulses pulse generator - HP 8082A digital oscilloscope - Tektronix TDS 340 multi-channel analyzer - LeCroy QVT 3001 comparison of QVT versus oscilloscope measurement of charge

5. P. Karchin – PMTs for Scintillator Based Muon Systempage 51/7/2004 To prepare for precise measurement of the charge in MAPMT pulses, a Lecroy QVT 3001 was calibrated with a pulse generator and a Tektronix TDS 340 digital oscilloscope. A charge of 1 pC is the expected response from the MAPMT for a single photoelectron and MAPMT gain of 6 X 10 6. The calibration curve is linear with a significant pedestal offset of about 2 pC.

6. P. Karchin – PMTs for Scintillator Based Muon Systempage 61/7/2004 MINOS base NIM HV supply - Bertan 375 X

7. P. Karchin – PMTs for Scintillator Based Muon Systempage 71/7/2004 A Hamamatsu R5900-M16 MAPMT mounted in a MINOS (far detector) base. The assembly has been modified to accommodate an aluminum guide for optical fibers. The 16 holes in the aluminum block are aligned With the MAPMT photocathode grid. Ambient light or pulses from an LED are injected into individual pixels. Cables are visible for HV bias and anode signal readout. Light Injection and PMT Readout

8. P. Karchin – PMTs for Scintillator Based Muon Systempage 81/7/2004 M16 PMT with MINOS base – response to LED pulse LED PMT 20 photo- electron signal equivalent

9. P. Karchin – PMTs for Scintillator Based Muon Systempage 91/7/2004 Status of PMT work at WSU ● PMT order placed: (3) H7546B: 64-channel, includes base, $1750 each (2) H8711: 16-channel, includes base, $1369 each ● near-term plan: measure MINOS MAPMT response to red LED pulses charge spectrum; single photon calibration decide on test protocall - what properties to measure gain and noise versus HV, temperature pixel-to-pixel variation, cross talk ● early 2004: test 5 tubes coordinate with ND on fiber connection coordinate with UCD on signal readout, HV bias