I am working with the Rutgers group on implementing a diamond based beam halo detector at he CMS experiment near the ip. They have the infrastructure and they would be happy to work with me.

1. simulate the following:
   • ODR/OTR photon simulation/calculation
   • background photon estimation/simulation
2. designing a target slit
3. plan a workshop to discuss plans and design options

I don't see any point in duplication of effort though. The signal condtioning channels are somewhat expensive, as are the transducers. I am less eager about this project. You should try to set up a system. If I am interested I will as Mark to send me some of his data, or even go to SLAC.

[1] M. Hess and C. Chen, Phys. Lett. A 295, 305 (2002).
[2] D. Sprehn, et al, in: Proceedings of 19th International Linac Conference, Argonne National Laboratory Report ANL-98/28, 1997, p. 689.
[3] D. Sprehn, et al, in: H.E. Brandt (Ed.), Intense Microwave Pulses VII, SPIE Proc. 4301, (2000), p. 132.
[4] SLAC Website http://www-project.slac.stanford.edu/lc/local/MAC/ OCT2001/ Caryotakis%20NLC%20KLYSTRON%20R.pdf
[5] Y. H. Chin, et al, in: Proceedings of the 2001 Particle Accelerator Conference, edited by P. W. Lucas and S. Webber, (2001), p. 3792.
[6] H. Matsumoto, et al, in: Proceedings of the 2001 Particle Accelerator Conference, edited by P. W. Lucas and S. Webber, (2001), p. 993.

1. We are currently working on the simulation. Geant4 code is in progress. We have one graduate student (part-time ) and one undergraduate student (10 h/week) working on it. There are several important questions that will be answered by the detailed simulation. We hope that we will have some results for the summer meeting.
2. We have designed and we are building 50ps light blinker that will be very useful for tests of the prototype of the calorimeter: ~50ps light pulse with cherenkov spectrum - similar to the one produced by EM shower in our calorimeter.
3. the machinery for polishing metal shims to reach optical quality which is critical for this calorimeter, have been mostly done some time ago. However this activity was frozen since we don't have funds from DoE.

Given the change in personnel, our budget should be reduced to $10,000 to pay Caleb during the summer and for travel funds for him.

With the recent availability of moderately fast, 0.25-micron, radiation hard amplifiers from the Jarron group at CERN, we have made preliminary pulse shape measurements, using a 90-Sr source, showing both rise and fall times of 3.5 ns. Actual sensor speeds are expected to be faster. Such pulses are shown in an article by Cinzia Da Via in the January 2003 CERN Courier. Further measurements with a setup having less noise and pickup are now underway.

Additional measurements are planned using 0.13-micron amplifiers from the same group. They are now in fabrication and are expected to have rise and fall times of 1.5 ns. Such high speed sensors could be useful for a beam shape monitor designed to make separate measurements of successive linear collider beam buckets.

A second 3D sensor fabrication run, with active-edge sensors, has been completed. These are sensors in which a boundary trench is made at the same time as the holes for one set of electrodes. The trench and holes are then filled with doped polycrystalline silicon, making the edge into an electrode. A final dicing etch is made part way through the trench, producing sensors that are expected to be active to within several microns of their physical edges. Tests have just started on these sensors.

The group is also in the process of discussing a number of the technical issues with potential suppliers. There are matters concerning radiation hardness, readout speed, and the reduction of multiple scattering in the inner layer to be addressed. Engineering details associated with thinning and stretching chips in the innermost layer are under investigation.

On the hardware side, we are setting up a GEM lab and have ordered a triple GEM detector from Sauli at CERN. We expect it to arrive by summer. We will continue to work on GEMs independent of the NLC proposal, as there is interest in the medium energy group at LA Tech to use GEMs for tracking in the QWEAK experiment at Jefferson Lab.

On the software side, we are still in the stage of installing and understanding how to run the NLC simulation package. We were charged by the review committee to work closely with Mike Strauss at Oklahoma, who is proposing to study various tracking algoritms in the forward region. Mike and I have met twice so far to discuss how to do this, once at the Arlington NLC workshop and again at a D0 collaboration meeting. We will not be able to make much headway on the simulations until we have funds for a student who can dedicate a significant amount of time to this.

• Long shaping-time silicon readout (Funded thorugh DOE Advanced Detector R&D Program)

  We are looking into electronic and eleectro-mechanical issues relating to the development of reading out long (1-2 meter) silicon strip detector ladders with low (10^-2) duty cycle, while retaining good (7 um or better) resolution. We are currently bringing a complete pulse- development simulation up, including effects from diffusion, magnetic fields, instantaneous space-charge expansion, detector geometry, noise, and readout strategy. We will use this to optimize shaping time and readout architecture. We have also identified and tested silicon strip sensors to be used in developing a prototype long ladder. We expect to begin design and contruction of the ladder in April. We have also begin the exploration of the electrical engineering issues associated with cycling the power, and have begin an initial layout of several functions on the prototype chip. Although it's not up-to-date, a WEB reference from January 2003 can be found here.

• SUSY signals in the forward direction

  With the backing of Tim Barklow at SLAC, we have been looking into the feasibility of reconstructing SUSY signals against Standard-Model backgrounds in the forward region, which we define to be between 100 and 650 mrad (between 0.8 and 0.995 in cos(theta)). So far, we have been working with Tim to ensure that Standard Model backgrounds are modelled appropriately for studies in this region, and have worked with Tim on identifying a number of refinements in the simulation. Work will probably intensify as the group increases from two (myself and a student) to four (three more students will be joining the project). The students that are involved are all undergraduate thesis students. A reference can be found here.

1. For 2 mm scintillator layers with 1/2Xo of Tungsten the energy resolution is 11%/sqrt(E) with a very small constant (for 40 layers). As the number of layers decreases to 35 and 30 the constant term increases substantially, probably due to leakage out the back. Leakage is 1.8% for 250 GeV Gammas for 40 layers and increases quickly as the number of layers decreases.
2. We need to understand how this calorimeter performs for 500 GeV photons and 1 TeV photons. Very likely we will need to go to 45 layers which is roughly another 2 cm.
3. The spatial resolution of the offset tiles is excellent. There are regions of the tiles where the dxdy resolution improves by as much as a factor of 40.
4. We need to begin to study the overlap of photons in a shower environment for a given scintillator plate size.
5. We are beginning to build a test bed to study the light collected when we collect the signals over 2-3 layers for minimum ionizing particles.

...and then we will be stuck, since we don't have money to buy them. In reality, we will have other things to work on, but funding will be the limiting factor soon if it doesn't arrive.

Work on developing these chambers has already begun. Several chambers have been built and have been tested thoroughly with sources and cosmic rays. Tests with 25 pads of 1 cm2 each are ongoing. Furthermore, considerable effort is dedicated to the development of the readout system, a challenge by itself given the large number of channels, of order of 50x10^6 for the entire DHCAL.

The project is being carried out by a collaboration of Argonne National Laboratory, Boston University, University of Chicago, and Fermilab. As a first major milestone, the collaboration aims at providing a 1 m3 prototype section for test beams in 2004/5.

Tests with particle beams will validate both the technology and the detailed Monte Carlo simulations of hadronic showers. The results will provide a basis for the comparison of the performances of the analog and digital approach to hadron calorimetry.

The Fermilab group has done simulation studies of single pion and muon signatures in the American SD muon detector, hadron and EM calorimeters and is developing muon identification algorithms based on these studies. They have confirmed previous muon studies on pion decays and punch-through by Marcello Piccolo that were reported during the Arlington workshop.

The NIU and Fermilab groups have made light yield measurements of various types of scintillator read out by wavelength shifting fibers. Radioactive isotopes and cosmic rays were used as ionization sources.

The Wayne State group has been learning to operate a MINOS-style multi-anode PMT.

A scintillator extruder recently acquired by NIU/NICADD has arrived at Fermilab where it is being set-up at Lab-5. Preliminary tests at the manufacturers, Berstorff, near Covington, Kentucky were successful. Assembly of the extruder at Fermilab is progressing and it is expected in April '03 that first pieces of extruded plastic will be ready to test. Near term plans for the machine include setting up a program of production and testing a variety of extrusion profiles.